TWI709701B - Linear actuator - Google Patents

Abstract

A linear actuator includes a base unit, a sliding unit, and a dustproof unit. The seat unit defines a rail groove extending along a sliding direction, and the rail groove has a notch formed on the top side. The sliding unit is movably installed on the base unit and defines a sliding gap located above the rail groove and communicating with the groove. The dustproof unit includes an adjustment block movably installed at one end of the base unit, a dustproof belt whose two ends are respectively fixed to the other end of the base unit and the adjustment block, and at least one dustproof belt that can be elastically adjusted Tensile tensioning group, the dust-proof belt passes through the sliding gap and correspondingly covers the notch, and the at least one tensioning group has an elastic member that constantly makes the adjustment block move away from the sliding unit. With the design of the at least one tensioning group, the tension of the dust-proof belt can be automatically and elastically adjusted to maintain the tightness.

Description

Linear actuator

The present invention relates to an actuator, in particular to a linear actuator for linear motion.

The linear actuator roughly includes a rail base extending in the long direction with the opening facing upward, and a sliding table movably installed on the rail base, and of course also includes some motors and transmission structures arranged in the rail base, The rotary motion of the motor can be converted into the linear motion of the transmission structure, which is used to drive the linear reciprocating movement of the sliding table.

In terms of design, in order to prevent dust from entering the linear actuator and affecting its operation, the industry has developed an existing linear actuator 9, which as shown in FIG. 1 is to add a dust-proof belt 92 on the top side of a rail seat 91. In order to achieve the dust-proof effect, however, since the dust-proof belt 92 will pass through a sliding table not shown in the figure and be arched upward, the dust-proof belt 92 is easily deformed and loosened, resulting in a gap between the side edges and the rail seat 91 93. This will result in poor sealing performance. Therefore, the design of the existing linear actuator 9 still needs to be improved.

Therefore, the object of the present invention is to provide a linear actuator that can at least overcome the disadvantages of the prior art.

Therefore, the linear actuator of the present invention includes a base unit, a sliding unit, and a dustproof unit.

The seat body unit includes a rail seat extending along a sliding direction, and a fixed end seat and an adjusting end seat respectively arranged at two opposite ends of the rail seat, the rail seat, the fixed end seat and the adjusting end seat The cooperation defines a rail groove with a notch formed on the top side.

The sliding unit is mounted on the rail seat to reciprocate along the sliding direction, and the sliding unit defines a sliding gap located above the rail groove.

The dust-proof unit includes an adjustment block mounted on the adjustment end base to reciprocate along the sliding direction, a dustproof belt whose two ends are respectively fixed to the fixed end base and the adjustment block, and at least one dust-proof belt connected to the adjustment block A tensioning group between the block and the adjusting end seat and capable of elastically adjusting the tension of the dust-proof belt, the dust-proof belt passes through the sliding gap and correspondingly covers the notch, the at least one tensioning group has a constant that causes the adjustment block to move away from the An elastic piece that fixes the direction of the end seat.

The effect of the present invention is that the at least one tension group can automatically and elastically adjust the tension of the dust-proof belt to have an excellent dust-proof effect.

1: base unit

10: Sliding direction

11: Rail seat

12: Fixed end block

13: Adjust the end seat

131: Tolerance

132: Piercing

133: Through hole

14: end cap

15: Rail groove

151: Notch

2: Sliding unit

21: Slide

22: Pallet

221: top surface

23: cover seat

231: Bottom

24: slip gap

241: Gap

3: Dustproof unit

31: adjustment block

32: Dust belt

321: fixed end

322: adjust end

33: Upper shell cover

34: fixed parts

35: Tension group

351: Elastic

352: adjustment piece

353: Screw Head

354: snail

Other features and effects of the present invention will be clearly presented in the embodiments with reference to the drawings, in which: FIG. 1 is an incomplete three-dimensional view of an existing linear actuator; FIG. 2 is the linear actuator of the present invention A perspective view of an embodiment; Figure 3 is an incomplete perspective exploded view of the embodiment, illustrating the structure of a sliding unit and the structural relationship with a base unit and a dustproof unit; Figure 4 is one of the embodiments An incomplete cross-sectional side view, illustrating the structural relationship between the sliding unit and the base unit and the dust-proof unit; Figure 5 is an incomplete three-dimensional exploded view of the embodiment, illustrating the structure of the dust-proof unit and the structure of the seat Figure 6 is an incomplete cross-sectional side view of the embodiment, illustrating the structural relationship between the dust-proof unit and the base unit, and that the dust-proof unit is in a state of accumulating elastic force; and Figure 7 It is a view similar to FIG. 6, showing that the dust-proof unit is in a state of releasing elastic force.

Referring to FIGS. 2, 3, and 4, an embodiment of the linear actuator of the present invention includes a base unit 1, a sliding unit 2, and a dustproof unit 3.

The base unit 1 includes a rail extending along a sliding direction 10 The seat 11, a fixed end seat 12 and an adjusting end seat 13 respectively arranged at two opposite ends of the rail seat 11, and a detachable cover on the end of the adjusting end seat 13 away from the rail seat 11 Cover 14 (see Figure 5). The rail base 11, the fixed end base 12 and the adjusting end base 13 cooperate to define a rail groove 15, and the rail groove 15 has a notch 151 formed on the top side.

The sliding unit 2 is reciprocally mounted on the rail base 11 along the sliding direction 10, and the sliding unit 2 includes a sliding base 21 movably arranged in the rail groove 15 and a sliding base 21. The upper pallet 22 and a cover seat 23 fixed on the sliding seat 21 and spaced above the pallet 22. The sliding seat 21 can be driven to slide back and forth between the fixed end seat 12 and the adjusting end seat 13 along the sliding direction 10, but its driving structure is not the focus of the present invention, so it will not be described here. The pallet 22 is in a curved arc shape, and has a top surface 221 that is curved upward along the sliding direction 10. The cover seat 23 has a bottom surface 231 facing the support plate 22, and two ends of the bottom surface 231 are spaced along the sliding direction 10 and protrude from the sliding seat 21 and slope downward. The cover 23 cooperates with the support plate 22 to define a sliding gap 24 located above the rail groove 15. The sliding gap 24 extends along the sliding direction 10 and forms openings on two opposite sides of the sliding unit 2. That is, the sliding gap 24 has two slots 241 arranged at intervals along the sliding direction 10 and communicating with the slot 151.

Referring to Figures 2, 5 and 6, to further look at the structure of the base unit 1 and the dust-proof unit 3, the adjustment end base 13 has a receiving groove 131 and two perforations 132, And two through holes 133. The receiving groove 131 is non-circular, and is formed on a side facing the rail seat 11 and communicates with the rail groove 15 and communicates upward to the top side. Each of the through holes 132 is located on a side away from the cavity 131, each of the through holes 133 is located between the corresponding through hole 132 and the cavity 131, the through holes 132 and the through holes 133 communicate with each other, and Along the sliding direction 10, it is connected to the receiving groove 131 from a side away from the rail base 11. It should be noted that the number of through holes 132 and through holes 133 is the same and is not limited to two, and can be one, three... etc. according to actual needs.

The dust-proof unit 3 includes an adjustment block 31 movably installed on the adjustment end base 13 along the sliding direction 10, a fixed end 321 (see FIG. 3) fixed to the fixed end base 12, and a The dust-proof belt 32 of the adjusting end 322 above the adjusting block 31, an upper shell cover 33 located above the adjusting block 31 and pressed on the adjusting end 322 of the dust-proof belt 32, and two connecting the upper shell cover 33 , The adjusting end 322 of the dust-proof belt 32 and the fixing member 34 of the adjusting block 31, and two tensioning groups 35 connected between the adjusting block 31 and the adjusting end seat 13 and capable of elastically adjusting the tension of the dust-proof belt 32 . The shape of the adjusting block 31 matches the receiving groove 131, and is also non-circular, and can only be movably received in the receiving groove 131 along the sliding direction 10. The dust-proof belt 32 is a piece of steel belt extending along the sliding direction 10, passing through the sliding gap 24 (see FIG. 4) and correspondingly covering the notch 151, and is located between the supporting plate 22 and the cover 23 , Will be lifted by the pallet 22 and pressed down by the cover 23. The fixing parts 34 are screws. It should be noted that the number of fixing parts 34 is the same and is not limited to two. According to actual needs, it can be one, Three... etc.

Each of the tensioning groups 35 has an elastic member 351 that constantly moves the adjusting block 31 away from the fixed end base 12 and an adjusting member 352 that can be used to adjust the elastic force of the elastic member 351. The elastic member 351 is a compression spring and is accommodated on a side of the through hole 132 close to the receiving groove 131. The adjusting member 352 is a screw extending along the sliding direction 10, and has a side of the through hole 132 away from the receiving groove 131 and pressing the elastic member 351 against the adjusting end seat 13 The screw head 353, and a screw body 354 extending from the screw head 353 toward the adjustment block 31 and passing through the through hole 133 of the adjustment end seat 13 and screwed to the adjustment block 31, the adjustment piece 352 will Move with the adjustment block 31. The number of the tensioning groups 35 is the same as the perforation 132 and the through hole 133, so the number is not limited to this embodiment.

As shown in Figures 2 and 4, when in use, the sliding unit 2 is driven to repeatedly move linearly on the rail base 11 along the sliding direction 10. The movement will also drive the dust-proof belt 32 to undulate, making the The dust-proof belt 32 has proper tension and is stretched to cover the notch 151. There will be no gap between the dust-proof belt 32 and the rail base 11. At the same time, the tension of the dust-proof belt 32 will also be as shown in Figures 2 and 6 , Resisting the pre-stored elastic force of the elastic member 351 of each tensioning group 35, so as to move the adjusting member 352 together toward the fixed end base 12 via the connected adjusting block 31. At this time, the dustproof unit 3 It is in a state of accumulated elasticity.

As shown in Figures 2 and 7, after a period of time, when the tension of the dust-proof belt 32 drops, the elastic member 351 of each tension group 35 will automatically release the accumulated elastic force to push the screw head 353, so that The adjusting member 352 moves the adjusting block 31 together in a direction away from the fixed end base 12, so as to pull the dust-proof belt 32 to increase the tension and fit the cover on the notch 151. The dust-proof belt 32 and the rail base 11 There will be no gap between them, and the dust-proof unit 3 is in a state of releasing elastic force.

When it is desired to adjust the elastic force of the elastic member 351, as long as the end cap 14 is detached from the adjusting end base 13, the adjusting member 352 can be rotated by a tool to adjust the adjusting member 352 relative to the adjusting block. 31 to move in and out, quite convenient. It is worth mentioning that the extension of the dust-proof belt 32 is much smaller than the amount of deformation of the elastic elements 351, so it is constantly subjected to the elastic tension of the elastic elements 351.

In summary, the linear actuator of the present invention, through the design of the dust-proof unit 3, can automatically and elastically adjust the tension of the dust-proof belt 32 so that the dust-proof belt 32 fits smoothly on the groove of the rail seat 11 The port 151 can maintain airtightness to prevent impurities and pollutants such as dust and debris from entering between the dust-proof belt 32 and the rail seat 11, so as to achieve excellent dust-proof effect and prolong the service life, so it can indeed achieve the cost of the invention. The purpose.

However, the above are only examples of the present invention. When the scope of implementation of the present invention cannot be limited by this, all simple equivalent changes and modifications made in accordance with the scope of the patent application of the present invention and the content of the patent specification still belong to The scope of the invention patent Inside.

10: Sliding direction

13: Adjust the end seat

131: Tolerance

132: Piercing

133: Through hole

14: end cap

3: Dustproof unit

31: adjustment block

32: Dust belt

322: adjust end

33: Upper shell cover

34: fixed parts

35: Tension group

351: Elastic

352: adjustment piece

353: Screw Head

354: snail

Claims (10)

A linear actuator includes: a seat body unit, including a rail seat extending along a sliding direction, and a fixed end seat and an adjusting end seat respectively arranged at two opposite ends of the rail seat. The rail seat, The fixed end seat cooperates with the adjustment end seat to define a rail groove, and the rail groove has a notch formed on the top side; a sliding unit is mounted on the rail seat to reciprocate along the sliding direction, The sliding unit defines a sliding gap located above the rail groove, the sliding gap extending along the sliding direction and forming openings on opposite sides of the sliding unit; and a dust-proof unit including a sliding gap that can follow the sliding direction An adjustment block movably installed on the adjustment end base, a dust-proof belt whose two ends are respectively fixed to the fixed end base and the adjustment block, and at least one that is connected between the adjustment block and the adjustment end base and can elastically adjust the dustproof belt A tensioning group with tension, the dust-proof belt passes through the sliding gap and correspondingly covers the notch, and the at least one tensioning group has an elastic member that constantly makes the adjustment block move away from the fixed end seat. The linear actuator according to claim 1, wherein the dust-proof belt is a piece of steel belt extending along the sliding direction. The linear actuator according to claim 1 or 2, wherein the at least one tensioning group further has an adjusting member that can be used to adjust the elastic force of the elastic member. The linear actuator according to claim 3, wherein the adjusting member of the at least one tensioning set is a screw extending along the sliding direction, and has a screw located at the adjusting end seat away from the adjusting block Side and press the elastic piece The screw head, and a screw body extending from the screw head in the direction of the adjustment block and passing through the adjustment end seat and screwed to the adjustment block, the elastic member is a compression spring, and is arranged on the screw head and The adjustment end seat. The linear actuator according to claim 4, wherein the adjusting end seat has a receiving groove connecting the rail groove and the top side, and the adjusting block can only be accommodated in the receiving groove reciprocatingly along the sliding direction Inside. The linear actuator according to claim 5, wherein the adjustment end seat further has the same number of through holes and through holes as the at least one tensioning group, and the through holes and the through holes communicate with each other and slide along the The direction is connected to the accommodating groove from the side away from the rail seat, the through hole is for the corresponding elastic piece and the screw head of the adjusting piece, and the through hole is for the screw body of the corresponding adjusting piece Wear stretch. The linear actuator according to claim 6, wherein the base unit further includes an end cover detachably covering a side of the adjusting end base away from the rail base. The linear actuator according to claim 1 or 2, wherein the dust-proof unit further includes an upper shell cover positioned above the adjustment block and pressed on a corresponding end of the dust-proof belt, and at least one connecting the The upper shell cover, the dust-proof belt and the fixing part of the adjustment block. The linear actuator according to claim 1, wherein the sliding unit includes a sliding seat that is reciprocally movably arranged in the rail groove and located under the dust-proof belt along the sliding direction, and a sliding seat is arranged on the sliding seat. A pallet on the seat and holding up the dust-proof belt, and a cover seat located above the dust-proof belt and pressing down the dust-proof belt. The linear actuator according to claim 9, wherein the pallet has a top surface that extends in an arc along the sliding direction, the cover has a bottom surface facing the pallet, and both ends of the bottom surface are along The sliding directions are spaced apart and inclined downward.

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