JP2006320280A - Device for opening and closing petri dish - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a device for opening and closing a lid of a petri dish without depending on manual operation of an inspector in measuring of falling bacteria. <P>SOLUTION: The petri dish opening and closing device has a receiver fixing part 13 for fixing a receiver of the petri dish comprising a receiver and a lid and a lid fixing part 30 for fixing the lid, wherein, when the receiver is fixed on the receiver fixing part 13 and the lid is fixed on the lid fixing part 30, the petri dish is opened and closed by shuttling one or both of the receiver fixing part 13 and the lid fixing part 30 between a first position where the lid completely seals a receiver opening and a second position where the lid is completely removed from the upper part of the receiver opening. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to an apparatus for opening and closing a petri dish used for falling bacteria measurement.

  As a method of measuring the amount of bacteria floating in the air, a petri dish consisting of a saucer and a lid, an agar medium is provided on the saucer, the lid is opened, the agar medium is exposed to the air for a certain period of time, and then the lid is closed, A so-called falling bacteria measurement method is generally used in which bacteria attached to a medium are cultured and the amount of bacteria is determined by the number of colonies formed.

  In recent years, strict hygiene standards have been demanded as hygiene concepts have been increasing. In Japan, falling bacteria are routinely measured by pharmaceutical companies, food companies, hospitals, and the like. In the EU countries, falling bacteria measurement is obligatory as a daily inspection item in the pharmaceutical manufacturing standards. Thus, the importance of falling bacteria measurement has been increasing in recent years.

  However, at present, all opening and closing of the petri dish lid is performed manually by an inspector, resulting in the following inconveniences. That is, the bacteria attached to the inspector's hand are often mixed in the culture medium when the lid is opened and closed, and there is a possibility that the accurate value of the amount of bacteria cannot be known. In addition, the opening and closing of the lid and the time required for it were prone to become loose because the inspector managed, and there was a high possibility of human error such as mistakes in opening and closing time and forgetting to close the lid. Furthermore, since it is performed manually, it is impossible to measure the falling bacteria in an unmanned state which is necessary depending on the situation.

  Therefore, the problem to be solved by the present invention is to provide a device for opening and closing the petri dish lid in the measurement of the falling bacteria, regardless of the manual operation of the inspector.

  In order to solve the above-mentioned problems, the present invention has a tray fixing part for fixing the tray and a lid fixing part for fixing the lid of the petri dish composed of the tray and the lid, and the lid is fixed to the tray fixing part. When the lid is fixed to the fixing portion, the lid fixing portion and the lid are between the first position where the lid completely seals the saucer opening and the second position where the lid is completely removed from above the saucer opening. The petri dish was opened and closed by reciprocating one or both of the fixed parts by the moving means. Here, the position where the lid is completely removed from above the tray opening means a position where the lid does not become an obstacle when the falling bacteria adheres to the medium in the tray.

  In the petri dish opening / closing device described above, the moving means includes a lifting / lowering means for either the tray fixing part or the lid fixing part and a swinging means for either the tray fixing part or the lid fixing part. It is preferable to open and close the petri dish by moving the lid fixing part up and down and moving the tray fixing part or the lid fixing part left and right by the swinging means.

  Alternatively, in the petri dish opening / closing apparatus described above, the moving means includes an elevating means and a swinging means for the lid fixing part, and the lid fixing part is moved up and down by the elevating means, and the lid fixing part is moved left and right by the swinging means. More preferably, the petri dish is opened and closed.

  Furthermore, when only the lid fixing part is moved, a male screw is provided on the outer periphery of the shaft to which rotational movement is given by the motor, a cylindrical core provided with a female screw on the central axis is screwed together, and the core is hollow. Inserted into a cylindrical pole, provided with an inverted L-shaped notch communicating with the hollow part on the outer periphery of the pole, and provided with a protruding part engaging with the notch on the outer periphery of the core, the protruding part of the core and the lid The fixed part is connected, and the core protrusion is guided to the notch of the pole as the shaft rotates, so that the core moves up and down along the vertical part of the notch and along the horizontal part of the notch. It is desirable that the lid fixing part is moved up and down and left and right by moving left and right to open and close the petri dish.

  In addition, it is preferable to have a sealing means for sealing the inner surface of the lid when the lid fixing portion is in the second position, and further includes a time setting means and a time measurement means, and after a set fixed time has elapsed. More preferably, the petri dish is opened, and the petri dish is closed after a set time has elapsed.

  It has a recording means for recording at least one of an operation place, an operation start date and time, and an operation time, has a printing means for printing the contents recorded by the recording means on a petri dish, and has a remote operation means for remotely controlling the above-mentioned various operations It is more preferable to configure as described above.

  A petri dish consisting of a saucer and a lid, which has a saucer fixing part for fixing the saucer and a lid fixing part for fixing the lid. When the saucer is fixed to the saucer fixing part and the lid is fixed to the lid fixing part, the lid Between the first position where the tray opening completely seals the tray opening and the second position where the lid is completely removed from above the tray opening by reciprocating one or both of the tray fixing section and the lid fixing section. Because the petri dish is opened and closed by exercising, the petri dish can be opened and closed regardless of the inspector's manual work, so there is no risk of contamination of bacteria attached to the inspector's hand, and accurate falling bacteria measurement is performed be able to.

  The moving means is composed of a lifting / lowering means for either the tray fixing part or the lid fixing part and a swinging means for either the tray fixing part or the lid fixing part. The lifting / lowering means moves the tray fixing part or the lid fixing part up and down. Simple mechanism to move the tray fixing part and lid fixing part only up and down and left and right by opening and closing the petri dish by moving the tray fixing part or lid fixing part left and right by swinging means Since the petri dish opening / closing device can be formed, the risk of failure is reduced, and the manufacturing cost can be reduced.

  The moving means includes an elevating means and a swinging means for the lid fixing part. The lid fixing part is moved up and down by the elevating means, and the petri dish is opened and closed by moving the lid fixing part left and right by the swinging means. Since the petri dish opening / closing device can be formed with a simple mechanism that moves only the fixing portion up and down, left and right, it is not necessary to provide a moving mechanism in the tray fixing portion. Therefore, it is more durable and less likely to cause a failure, and the manufacturing cost can be further reduced.

  When only the lid fixing part is moved, a male screw is provided on the outer periphery of the shaft to which rotational movement is given by the motor, a cylindrical core provided with a female screw on the central axis is screwed onto the shaft, and the core is a hollow cylinder. Inserted into a cylindrical pole, provided with an inverted L-shaped notch that communicates with the hollow part on the outer periphery of the pole, and provided with a protruding part that engages with the notch on the outer periphery of the core. When the shaft is rotated, the core protrusion is guided by the pole notch so that the core moves up and down along the vertical part of the notch and along the horizontal part of the notch. By moving left and right to move the lid fixing part up and down and left and right, and opening and closing the petri dish, it is possible to move the lid fixing part up and down and left and right with a simple motor and one motor. Costs can be reduced and Miniaturization of can be achieved.

  When the lid fixing portion is in the second position, having a sealing means for sealing the inner surface of the lid can prevent bacteria from adhering to the inner surface of the lid. Further improve.

  It has time setting means and time measurement means, opens the petri dish after the set fixed time has passed, closes the petri dish after the set fixed time has passed, and further automates, forgetting to close the lid, opening / closing error etc. Human error can be reduced, and more accurate falling bacteria measurement can be performed. Work efficiency is also improved.

  Use of recording means for recording at least one of the operation location, the operation start date and time, and the operation time makes it possible to obtain useful information for improving the measurement accuracy, such as the measurement location and date. By having printing means for printing the contents recorded by the recording means on the petri dish, the information can be obtained in a state separated from the apparatus by recording the information on the petri dish itself, thereby improving convenience. By having a remote control means for remotely controlling the above various operations, it is possible to measure falling bacteria in an unattended state.

  Embodiments of the present invention will be described below with reference to the drawings. First, the structure that can be seen from the outside of the petri dish opening and closing device 1 according to the first embodiment of the present invention is, as shown in FIG. 1, an apparatus main body 10, and a pole 20 that rises in a vertical direction from the upper surface of the apparatus main body 10. It consists of a lid fixing portion 30 extending forward from the outer periphery of the pole 20.

  Turning now to the internal structure, as shown in FIG. 2, the apparatus body 10 includes a motor 40 and the pole 20 includes a core 50. The motor 40 and the shaft 60 are connected via a speed reducer 45 as described later, and the shaft 60 and the core 50 are screwed together as described later.

  As shown in FIG. 2, the apparatus main body 10 is a box-shaped body having a square shape in plan view, and a panel 11 is provided on the front surface, which is inclined so that it is easy to see and operate. The panel 11 is fixed to the apparatus main body 10 with a bracket or the like (not shown).

  As shown in FIG. 3, the panel 11 is provided with a power button 11a, a reset button 11b, a lamp 11c indicating the opening / closing time of the petri dish lid, and the like. A circular through hole 12 through which the core 50 can travel between the apparatus body 10 and the pole 20 is provided on the upper surface of the apparatus body 10.

  Further, as shown in FIG. 2, the upper surface of the apparatus main body 10 is provided with a concave portion 13a having a semi-oval shape in plan view, and this and a sandwiching body 13b described later form a saucer fixing portion 13 for fixing the dish tray. To do. The outer periphery of the recess 13a has an arc shape corresponding to the outer periphery of the petri dish, and the arc is opened on the front side of the apparatus main body 10, so that the tray can be slid from the front surface of the apparatus main body 10 and set. . Further, a sandwiching body 13b that protrudes oppositely is provided on the outer periphery of the recess 13a. The sandwiching body 13b is made of an elastic member, and when the tray is set, the tray is sandwiched from both sides by the restoring elasticity of the sandwiching body 13b and firmly fixed. Is done.

  Similarly, as shown in FIG. 2, the lid fixing portion 30 has a U-shaped arm 31 formed so as to embrace the petri dish lid, and a leaf spring-like elasticity fixed to both sides and the middle of the arm 31. It consists of a clamping body 32 made of a member. When the lid is set from the opening of the arm 31, the lid is elastically sandwiched and fixed by the sandwiching body 32.

  Further, in the apparatus main body 10, an operation circuit as shown in FIG. Here, the motor 40 and the battery 41 are connected with the switch 42 interposed therebetween, and the on / off of the switch 42 is controlled by the timer 43. The timer 43 is connected to the timer switch 44, thereby setting the operation time and the like. A shaft 60 is connected to the motor 40 via a speed reducer 45, and the shaft 60 is rotationally driven in the axial direction. The speed reducer 45 converts the high speed and low torque rotation of the motor 40 into low speed and high torque rotation, and a required rotational force is applied to the shaft 60.

  Here, as shown in FIG. 2, a male screw is provided on the outer periphery of the shaft 60. As will be described later, a female screw on the inner surface of the through hole 51 of the core 50 is screwed into the male screw of the shaft 60, and a rotational force is applied to the core 50.

  As shown in FIG. 2, the pole 20 includes a hollow cylindrical member 21 and a cap 22 that blocks the upper end opening of the cylindrical member 21. An inverted L-shaped notch 23 is provided on the outer periphery of the cylindrical member 21, and the hollow portion is opened at the front surface. The lower end of the cylindrical member 21 is fixed by welding or the like around the through hole 12 of the apparatus main body 10.

  As shown in FIG. 2, the core 50 has a substantially cylindrical shape, and a through hole 51 is provided in the center in the axial direction. A female screw is formed on the inner surface of the core 50, and the shaft 60 is screwed together. A block-shaped protrusion 52 is provided in the middle of the outer periphery of the core 50. The above-described lid fixing portion 30 is fixed to the protruding portion 52 with a bolt or the like. When the core 50 is inserted into the pole 20, the protruding portion 52 is slidably engaged along the notch 23 of the pole 20.

  The core 50 screwed to the shaft 60 is inserted into the pole 20 as shown in FIG. As shown in FIG. 5A, when the protruding portion 52 is engaged with a portion where the notch 23 stands vertically, the protruding portion 52 is provided vertically because the horizontal movement is sealed. The core 50 is guided by the cut-out 23, and the core 50 is screwed up according to the rotation of the shaft 60 to perform the ascending motion. As shown in FIG. 5B, when the protruding portion 52 reaches the upper end of the notch 23, the upward movement is sealed. Then, as shown in FIG. 5 (c), it is guided by a horizontally provided cutout 23, and a swing motion is performed toward the left in the figure. Similarly, when the motor 40 is reversely rotated from the state shown in FIG. 5C, first, as shown in FIG. 5B, the head swings to the right in the figure, and then as shown in FIG. Perform a downward movement.

  As described above, since the lid fixing portion 30 is fixed to the protruding portion 52 of the core 50, the lid is set on the lid fixing portion 30, the tray is set on the tray fixing portion 13 of the apparatus main body 10, and the motor When 40 is operated, the petri dish is automatically opened and closed from the closed state as shown in FIG. 6 (a) to the open state as shown in FIG. 6 (b), or vice versa. Done.

  In order to accurately measure the falling bacteria, the lid needs to be completely removed from the upper side of the tray, so that the horizontal rotation angle of the lid fixing portion 30 is cut from 90 degrees to 270 degrees. A notch 23 should be formed.

  When measuring falling bacteria, the time for opening the lid of the petri dish and the time for closing the lid can be adjusted according to the purpose of use or the situation. In this embodiment, three types of opening / closing times set according to the number of times the power button 11a of the panel 11 is pressed can be set in order, and the set opening / closing times indicate the lighting of the lamp 11c indicating the opening / closing time of the panel 11. Can be confirmed. When resetting, the user presses the reset button 11b and starts again. That is, the timer switch 44 is operated by the power button 11a and the reset button 11b.

  FIG. 7 shows a second embodiment. In this case, contrary to 1st embodiment, a petri dish is opened and closed by moving the saucer fixing | fixed part 13 up and down and right and left. As shown in the figure, a lid fixing portion 30 made of a U-shaped arm 31 is fixed to the outer peripheral wall surface of the pole 20 with a bolt or the like, and a saucer fixing portion 13 made of a similar U-shaped arm is fixed to the protruding portion 52 of the core 50. Has been. The pole 20 is provided with an L-shaped notch 23, and the protrusion 52 is slidably engaged with the notch.

  When the motor 40 is driven, when the protruding portion 52 is engaged with the portion where the notch 23 stands vertically, the protruding portion 52 is provided vertically because the horizontal movement is sealed. Guided by the notch 23, the tray fixing portion 13 is screwed down as the shaft 60 rotates, and moves downward. When the protrusion 52 reaches the lower end of the notch 23, the downward movement is sealed. And it guides to the notch 23 provided horizontally, and the swinging movement of the saucer fixing | fixed part 13 is performed toward the left in the figure. In this way, the petri dish lid is opened. When the motor 40 is rotated in the reverse direction, the reverse movement is performed and the petri dish lid is closed.

  Since the lid needs to be completely removed from above the saucer as in the first embodiment, the notch 23 is formed so that the horizontal rotation angle of the saucer fixing portion 13 is 90 degrees to 270 degrees. Should be formed.

  FIG. 8 shows the third and fourth embodiments. While the first and second embodiments described above move either the lid fixing portion 30 or the tray fixing portion 13, the third and fourth embodiments shown in FIGS. 8 (a) and 8 (b). Both have a structure in which the petri dish is opened and closed by moving both the lid fixing part 30 and the tray fixing part 13, and both the lid fixing part 30 and the tray fixing part 13 made of U-shaped arms are separately provided. The core 50 is fixed by bolts or the like, and both the cores 50 are screwed onto the same shaft 60. Then, the projecting portions 52 of the respective cores 50 are guided to the notches provided in the pole 20, whereby the petri dish is opened and closed by the same mechanism as that of each of the above embodiments.

  In this embodiment, in order to simplify the structure, both the cores 50 are screwed onto the same shaft 60 and driven by one motor 40. However, the two cores 50 are not limited to this, Of course, it may be screwed onto a separate shaft 60 and driven by a separate motor 40.

  That is, in the case of the third embodiment shown in FIG. 8A, the pole 20 is provided with a notch 23 in the horizontal direction, that is, one horizontal character for guiding the protruding portion 52 of the core 50 to which the lid fixing portion 30 is fixed. The pole 20 is provided with a notch 23 in the vertical direction, that is, a single vertical character for guiding the protruding portion 52 of the core 50 to which the tray fixing portion 13 is fixed, and the lid fixing portion 30 is fixed by the rotation of the shaft 60 as the motor 40 is driven. The side core 50 swings left and right, and the tray 50 is moved up and down to open and close the petri dish.

  On the contrary, in the case of the fourth embodiment shown in FIG. 8B, the pole 20 is provided with a notch 23 of one vertical character for guiding the protruding portion 52 of the core 50 to which the lid fixing portion 30 is fixed. The pole 20 is provided with a horizontal cutout 23 for guiding the protruding portion 52 of the core 50 to which the tray fixing portion 13 is fixed, and the rotation of the shaft 60 accompanying the driving of the motor 40 causes the center of the lid fixing portion 30 to be fixed. The child 50 moves up and down, and the petri dish fixing portion 13 fixing side core 50 opens and closes the petri dish by swinging left and right.

  FIG. 9 shows a fifth embodiment. In this embodiment, the petri dish is opened and closed by rotating the lid fixing portion 30 in the vertical direction around the horizontal rotation axis. That is, the gear 71 provided at the upper end of the vertical axis 70 connected to the motor 40 and the gear 81 provided at one end of the horizontal axis 80 to which the lid fixing part 30 is fixed are engaged. By converting the rotational movement of the vertical axis 70 into the rotational movement of the horizontal axis 80, the lid fixing unit 30 fixed to the horizontal axis 80 performs the rotational movement with the horizontal axis 80 as the rotational axis according to the rotation of the horizontal axis 80. The petri dish is opened and closed as shown in FIGS. 9B and 9C by rotating and moving the lid away from or toward the tray.

  In this case as well, in order to accurately measure the falling bacteria, the lid needs to be completely removed from the upper side of the tray, so the vertical rotation angle of the lid fixing portion 30 should be 90 degrees or more. is there. In this case, when the lid of the petri dish is opened, the inner surface of the lid faces upward, so that falling bacteria may adhere to the inner surface of the lid, which may hinder accurate measurement. For this reason, it is preferable to take some means for preventing the falling bacteria from adhering the inner surface of the lid in an airtight manner, particularly when it is desired to improve the measurement accuracy.

  FIG. 10 shows a sixth embodiment provided with means for preventing falling bacteria adhesion. Behind the pole 20 of the petri dish opening / closing device 1, a shaft 90 connected to a motor 91 via a speed reducer and applied with a rotational motion is erected in the vertical direction. A flat sealing plate 92 is connected to the outer periphery of the shaft 90 so as to be orthogonal to the shaft 90 so as to be rotatable in the horizontal direction. In synchronization with the opening of the lid, as shown in FIG. 10B, the sealing plate 92 is horizontally rotated from the rear and fed forward, and the sealing plate 92 is brought into contact with the periphery of the opening of the lid to seal the lid. To do. In this embodiment, although the two motors 40 and 91 are used, it goes without saying that the shaft 60 and the shaft 90 may be driven by one motor.

  The petri dish opening / closing mechanism and the lid sealing mechanism may be separated, and the lid sealing device may be formed separately from the petri dish opening / closing device 1. In this way, space can be saved at the time of storage, and energy saving and cost reduction can be achieved without using a lid sealing device when measurement accuracy is not so required. Further, in order to improve the measurement accuracy, it is more preferable that the sealing plate 92 is sterilized before using the petri dish opening / closing device 1 or a separate sealing plate 92 covering mechanism is provided so that no falling bacteria are attached. The sealing plate 92 may have various shapes such as a circular shape and a rectangular shape, but needless to say, the sealing plate 92 needs to have a size and a shape that can seal the lid.

  FIG. 11 shows a seventh embodiment. As shown in the figure, in this embodiment, the motor 40 is directly connected to the horizontal shaft 80 via the speed reducer 45, and a mechanism for rotating the petri dish lid by combining the horizontal shaft 80 and the vertical shaft 70 described above. This has a simpler structure than the sixth embodiment. In this case as well, it is preferable to take a means for preventing falling bacteria from adhering to the inner surface of the lid, as in the sixth embodiment.

  In addition, the rotational movement alone may cause the lid side and the side of the tray to get caught when the lid is rotated, making it difficult to open and close. Is possible.

  That is, when opening the petri dish, the lid is raised and then rotated, and when closing the petri dish, the lid is rotated and then lowered. In that case, it is normal to use two motors 40 for rotation and lifting, but it is necessary to control both motors 40 so that the operations can be performed in the order described above. The lifting operation can be realized with the structure according to the first to fourth embodiments, and the rotation operation can be realized with the structure according to the fifth to seventh embodiments. It is possible to easily realize the operation. Further, as in the fifth and sixth embodiments, if measures are taken to prevent falling bacteria from adhering to the inner surface of the lid, the measurement accuracy is further improved.

  In each of the above-described embodiments, if the petri dish opening / closing device 1 further includes a memory that records at least one of the operation location, the operation start date and time, and the operation time, the significance of the measurement result is not required to be recorded separately. This is preferable because it becomes clear and useful information can be obtained when correcting an error. Of course, it is more preferable to record all of the operation place, operation start date and time, and operation time. It is more convenient to print information such as the operation location, operation start date and time, and operation time recorded in the memory on the upper and side surfaces of the petri dish by printing means such as a stamp because the information becomes clear at a glance. These can be easily realized by known recording means and printing means.

  Furthermore, setting the petri dish open / close time and the like by remote control using a remote controller is convenient because it allows the bacteria to be measured in an unattended state. For example, the falling bacteria can be measured even at a time such as midnight when the inspector returns home. This can be easily realized by known remote control means.

  In addition, since the petri dish open / close device 1 needs to be sterilized after being used a certain number of times in order to increase the accuracy of falling bacteria measurement, each member forming the petri dish open / close device 1 is a metal that is not easily denatured and deteriorated even if disinfected. It is preferable to be manufactured. Among these, stainless steel is most preferable in consideration of the manufacturing cost, strength, and the like of the petri dish opening / closing device 1.

  In each of the embodiments described above, the lid fixing part 30 and the tray fixing part 13 are formed by the U-shaped arm 31 or the recess 13a and the sandwiching bodies 13b and 32, and the petri dish is fixed by sandwiching. The fixing is not limited to this means, and may be fixed by sucking with a suction cup, for example. In addition, in the lid fixing part 30, a U-shaped arm 31 suspended from above in a crane shape may be used to sandwich and fix the lid so as to hold it from the upper surface.

  In each of the above-described embodiments, the petri dish is generally circular in plan view. However, the petri dish is not limited to this, and petri dishes having various special shapes such as an ellipse in plan view and a polygon in plan view are used. In this case, the shapes of the lid fixing part 30 and the tray fixing part 13 may be appropriately changed according to the shape of the petri dish. For example, in the case of using a petri dish having a square shape in plan view, it may be fixed by the lid fixing part 30 and the tray fixing part 13 composed of the U-shaped arm 31 or the recess 13a and the sandwiching bodies 13b and 32.

The perspective view of the petri dish opening and closing device concerning a first embodiment Disassembled perspective view of petri dish switch Panel top view Motor block circuit diagram (A), (b), (c) is the operation of the core The figure which closed the petri dish lid of the petri dish opening and closing device of FIG. Fig. 1 shows the petri dish opening and closing device of Fig. 1 with the petri dish lid opened. The perspective view of the petri dish opening and closing device concerning a second embodiment (A) is applied to the third embodiment, (b) is an operation diagram of the petri dish opening and closing device according to the fourth embodiment. (A), (b), (c) is an operation | movement figure of the petri dish opening-and-closing apparatus concerning 5th embodiment. (A), (b) is an operation | movement figure of the petri dish opening-and-closing apparatus concerning 6th embodiment. The perspective view of the petri dish opening and closing device concerning a 7th embodiment

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Petri dish opening / closing apparatus 10 Apparatus main body 11 Panel 11a Power button 11b Reset button 11c Lamp 12 Through-hole 13 Saucepan fixing | fixed part 13a Recessed part 13b Clamping body
20 pole 21 cylindrical member 22 cap 23 notch 30 lid fixing part 31 arm 32 clamping body 40 motor 41 battery 42 switch 43 timer 44 timer switch 45 speed reducer 50 core 51 through hole 52 projecting part 60 shaft 70 vertical axis 71 gear 80 Horizontal shaft 81 Gear 90 Shaft 91 Motor 92 Sealing plate

Claims (9)

  A petri dish consisting of a saucer and a lid, which has a saucer fixing part for fixing the saucer and a lid fixing part for fixing the lid. When the saucer is fixed to the saucer fixing part and the lid is fixed to the lid fixing part, the lid Between the first position where the tray opening completely seals the tray opening and the second position where the lid is completely removed from above the tray opening by reciprocating one or both of the tray fixing section and the lid fixing section. Petri dish opening and closing device that opens and closes the petri dish by exercising.   The moving means includes lifting / lowering means for either one of the saucer fixing part and the lid fixing part and a swinging means for one of the saucer fixing part and the lid fixing part. The lifting / lowering means moves the saucer fixing part or the lid fixing part up and down. The petri dish opening and closing device according to claim 1, wherein the petri dish is opened and closed by moving the pan fixing part or the lid fixing part to the left and right by the swinging means.   2. The moving means comprises an elevating means and a swinging means for the lid fixing part, and the petri dish is opened and closed by moving the lid fixing part up and down by the elevating means and moving the lid fixing part left and right by the swinging means. Petri dish opening and closing device described in 1.   The elevating means and the swinging means are provided with a male screw on the outer periphery of a shaft to which rotational movement is given by a motor, and a cylindrical core provided with a female screw on the central axis is screwed to the shaft, and the core is a hollow cylindrical pole. Is provided with an inverted L-shaped notch that communicates with the hollow part on the outer periphery of the pole, and a protruding part that engages with the notch of the pole is provided on the outer periphery of the core. The protruding part of the core and the lid fixing part As the shaft rotates, the core protrusion is guided by the pole notch, so that it moves up and down along the vertical part of the notch and moves left and right along the horizontal part of the notch. The petri dish opening and closing device according to claim 3, wherein the lid fixing part is moved vertically and horizontally to open and close the petri dish.   The petri dish opening and closing device according to any one of claims 1 to 4, further comprising a sealing means for sealing an inner surface of the lid when the lid fixing portion is in the second position.   The petri dish opening and closing device according to any one of claims 1 to 5, further comprising a time setting unit and a time measuring unit, wherein the petri dish is opened after a set period of time has elapsed, and the petri dish is closed after a set period of time has elapsed.   The petri dish opening and closing device according to any one of claims 1 to 6, further comprising recording means for recording at least one of an operation place, an operation start date and time, and an operation time.   The petri dish opening and closing device according to claim 7, further comprising a printing unit that prints the contents recorded by the recording unit on the petri dish.   The petri dish opening / closing device according to any one of claims 1 to 8, further comprising a remote control means for remotely controlling the petri dish opening / closing operation and the operations of claims 5 to 8 accompanying the petri dish opening / closing operation.

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