CN111396303A - Split type cross head for pump - Google Patents

Abstract

This invention provides a split-type crosshead for pumps, relating to the field of high-pressure plunger pump components. It includes a split crosshead body, a crosshead extension, and a locking component. In actual use, the wear on the crosshead extension is far less than that on the crosshead body; therefore, workers can replace only the crosshead body, reducing subsequent maintenance costs and achieving cost reduction. Furthermore, the crosshead body and crosshead extension can be manufactured independently, eliminating the need for post-processing of the crosshead's internal cavity and pin holes, thereby improving production efficiency. Additionally, the locking component can axially lock the crosshead body and crosshead extension, preventing breakage at the connection point and effectively increasing the overall strength of the crosshead.

Description

A split crosshead for a pump

technical field

The invention relates to the field of high-pressure plunger pump parts, in particular to a split-type crosshead for a pump.

Background technique

The power end transmission mechanism of the existing high-pressure plunger pump mainly includes three parts: crankshaft, connecting rod and cross head. The connecting rod of the power end and the ceramic plunger of the water end are connected by the cross head, and the cross head plays a transitional role of connecting the top and the bottom. The method of avoiding the direct connection between the ceramic plunger and the connecting rod makes the ceramic plunger free from the side pressure brought by the connecting rod, thereby protecting the brittle ceramic plunger.

In the field of high-pressure piston pumps, the crosshead is placed in the crankcase. In order to ensure the airtightness of the crankcase, it is usually necessary to fit an oil seal on the crosshead extension. Therefore, the length of the crosshead extension almost accounts for the entire length of the crosshead. 1/2 of it, making the pump crosshead classified as a bushing type part.

With the increase of service life, the wear of the side wall part of the inner cavity of the crosshead continues to increase, but under the lubrication of the oil seal, the wear of the extension area of the crosshead is much smaller than that of the inner cavity of the crosshead, but once the wear of the crosshead exceeds a certain level, Then the crosshead needs to be replaced as a whole, and the follow-up maintenance cost is high.

In addition, if plastic forming is used, that is, the forging method will bring the following problems: it is difficult to demould the inner cavity of the crosshead, and the oil passage holes and pin holes of the inner cavity need to be processed later, which reduces the utilization rate of materials and increases the machine tool. Processing man-hours; if liquid forming is used, the casting method can avoid a series of problems caused by forging, but because liquid forming is used for crossheads with strict working conditions, due to the limitations of casting itself, the casting material The grains are often relatively coarse, and any minor casting defects such as insufficient pouring, cold insulation, slag inclusion, and pores are not allowed.

The high-power and high-frequency operation of the high-pressure plunger pump has invisibly increased the design requirements for the tensile strength and fatigue strength of the transmission parts. The crosshead design scheme that requires strength and can bring economic benefits at the same time has become an urgent problem to be solved in this field.

SUMMARY OF THE INVENTION

The technical problem to be solved by the present invention is to overcome the deficiencies in the prior art and provide a split crosshead for a pump, which has low maintenance cost in the later stage and high production and assembly efficiency.

The invention is realized by the following technical solutions: a split crosshead for a pump, comprising a split crosshead main body, a crosshead extension and a locking part, an inner cavity is opened on the left side of the crosshead main body, and the crosshead main body is provided with an inner cavity. The right side is locked and connected with the crosshead extension through the locking member. The crosshead main body and the crosshead extension are both cylindrical structures, and the diameter of the crosshead extension is smaller than that of the crosshead main body. The side wall of the inner cavity of the crosshead main body is symmetrically opened with Pin hole.

The crosshead of the present invention includes a separate crosshead main body, a crosshead extension and a locking part. In the later actual use process, the wear degree of the crosshead extension is much smaller than that of the crosshead main body, so the staff can only replace the crosshead main body, and then Reduce the maintenance cost in the later stage and reduce the cost; in addition, the main body of the crosshead and the extension of the crosshead can be manufactured independently, thereby avoiding the post-processing of the inner cavity and the pin hole of the crosshead in the later stage, thereby improving the production efficiency; The crosshead main body and the crosshead extension are locked in the axial direction to prevent the connection between the crosshead main body and the crosshead extension from being broken, thereby effectively increasing the overall strength of the crosshead.

According to the above technical solution, preferably, the locking member is a threaded pin, the performance level of the threaded pin is above 12.9, the main body of the crosshead and the middle of the extension of the crosshead are provided with threaded holes that are adapted to the threaded pins, and the threaded connection is locked. The effect is stable and the assembly is efficient.

According to the above technical solution, preferably, a convex stop is provided on the right side of the main body of the crosshead, and a concave stop adapted to the convex stop is provided on the close side of the crosshead extending from the crosshead body. The cooperation of the mouth can realize the preliminary locking of the main body of the crosshead and the extension of the crosshead, which is convenient for the staff to install the threaded pin.

According to the above technical solution, preferably, the convex stop and the concave stop are in an interference fit, which can effectively prevent the relative rotation of the crosshead main body and the crosshead extension.

According to the above technical solution, preferably, the main body of the crosshead is formed by investment casting. Since the investment casting method can directly cast holes with a diameter of more than 2 mm, the inner cavity and the pin hole of the crosshead can be cast in one piece. , thereby avoiding the existing post-processing inner cavity and pin hole, which not only improves the production efficiency of the crosshead main body, but also greatly improves the utilization rate of production materials.

According to the above technical solution, preferably, the crosshead is formed by turning steel bars. Since the steel bars are generally hot-rolled by plastic forming, the tensile strength and plasticity are much better than those obtained by casting and molding, which can effectively meet the needs of The cross-head extension is repeatedly subjected to compressive stress and tensile stress, and at the same time, the quality of the product is improved by comparing various casting defects caused by castings.

According to the above technical solution, preferably, the concave stop is a circular slot, and the convex stop is a cylindrical projection adapted to the circular slot, and the circular slot and the cylindrical projection have high production efficiency, And the dimensional accuracy is easy to control.

According to the above technical solution, preferably, the end of the locking member is provided with a polygonal slot, and the polygonal slot may preferably be a hexagonal slot, which is convenient for workers to use an Allen wrench to lock the locking member.

The beneficial effects of the present invention are: the crosshead of the present invention includes a separate crosshead main body, a crosshead extension and a locking part, and in the later use process, the wear degree of the crosshead extension is much smaller than that of the crosshead main body, so the staff can only The main body of the crosshead can be replaced, thereby reducing the maintenance cost in the later period and reducing the cost; in addition, the main body of the crosshead and the extension of the crosshead can be manufactured independently, thereby avoiding the post-processing of the inner cavity and the pin hole of the crosshead, thereby improving the production efficiency; The locking component can lock the crosshead main body and the crosshead extension in the axial direction to prevent the connection between the crosshead main body and the crosshead extension from being broken, thereby effectively increasing the overall strength of the crosshead.

Description of drawings

FIG. 1 shows a schematic diagram of a three-dimensional structure after assembly according to an embodiment of the present invention.

FIG. 2 shows a schematic diagram of a three-dimensional structure when separated according to an embodiment of the present invention.

FIG. 3 shows a schematic diagram of a cross-sectional structure during separation according to an embodiment of the present invention.

In the figure: 1. Crosshead main body; 2. Crosshead extension; 3. Locking part; 4. Inner cavity; 5. Pin hole; , screw holes.

Detailed ways

In order to make those skilled in the art better understand the technical solutions of the present invention, the present invention will be further described in detail below with reference to the accompanying drawings and the best embodiments.

As shown in the figure, the present invention provides a split crosshead for a pump, including a split crosshead main body 1, a crosshead extension 2 and a locking member 3, and the crosshead main body 1 and the crosshead extension 2 are both cylindrical In addition, the diameter of the crosshead extension 2 is smaller than that of the crosshead main body 1. In the actual use process in the later stage, the wear degree of the crosshead extension 2 is much smaller than that of the crosshead main body 1. Therefore, the staff can only replace the crosshead main body 1, thereby reducing the later stage. The maintenance cost is reduced and the cost is reduced. The left side of the crosshead main body 1 is provided with an inner cavity 4 for inserting one end of the connecting rod. The right side of the crosshead main body 1 is locked and connected with the crosshead extension 2 through the locking member 3. 3. It is preferably a threaded pin, and the performance level of the threaded pin is above 12.9. The middle of the crosshead main body 1 and the crosshead extension 2 is provided with a screw hole 9 that is adapted to the threaded pin, and the threaded connection has a stable locking effect and is assembled. High efficiency, the threaded pin can lock the crosshead body 1 and the crosshead extension 2 in the axial direction, preventing the connection between the crosshead body 1 and the crosshead extension 2 from breaking, thereby effectively increasing the overall strength of the crosshead. The side wall of the inner cavity 4 of the 1 is symmetrically provided with a pin hole 5, the right side of the crosshead body 1 is provided with a convex stop 6, and the crosshead extension 2 and the crosshead body 1 close to the side are provided with a convex stop 6 to match. The concave stop 7, through the cooperation of the convex stop 6 and the concave stop 7, can realize the preliminary locking of the crosshead body 1 and the crosshead extension 2, which is convenient for the staff to install the threaded pin, and the convex stopper 6 and the concave stopper 7 can be preliminarily locked. A slight interference fit can effectively prevent the relative rotation of the crosshead main body 1 and the crosshead extension 2. The concave stop 7 is a circular slot, and the convex stop 6 is a cylindrical projection that fits with the circular slot. , circular grooves and cylindrical bumps have high production efficiency, and the dimensional accuracy is easy to control.

According to the above embodiment, preferably, the main body 1 of the crosshead is formed by using the investment casting method. Since the investment casting method can directly cast a hole with a diameter of more than 2 mm, the inner cavity 4 and the pin hole 5 of the crosshead can be integrated. Casting and forming, thereby avoiding the existing post-processing of the inner cavity 4 and the pin hole 5, not only improves the production efficiency of the crosshead body 1, but also greatly improves the utilization rate of production materials.

Further, the cross-head extension 2 is formed by turning of steel bars. Since the steel bars are generally hot-rolled by plastic forming, the tensile strength and plasticity are obviously better than the blanks obtained by casting, which can effectively meet the requirements of the cross-head extension 2. Repeated use of compressive stress and tensile stress, and compared with various casting defects caused by castings, the quality of the product has been significantly improved. At the same time, since the cross head extension 2 does not need to open the mold, it can be directly used for bar turning. Thereby reducing the input cost of the product in the development stage.

Further, the end of the threaded pin is provided with a polygonal slot 8, and the polygonal slot 8 may preferably be a hexagonal slot, which is convenient for the worker to lock the locking member 3 with an Allen wrench.

The beneficial effects of the present invention are: the crosshead of the present invention comprises a separate crosshead main body 1, a crosshead extension 2 and a locking part 3, and in the later use process, the wear degree of the crosshead extension 2 is much smaller than that of the crosshead main body 1, Therefore, the staff can only replace the crosshead main body 1, thereby reducing the maintenance cost in the later period and reducing the cost; in addition, the crosshead main body 1 and the crosshead extension 2 can be manufactured independently, thereby avoiding the need for the crosshead cavity and the pin hole 5. Post-processing, thereby improving production efficiency; in addition, the locking member 3 can lock the crosshead main body 1 and the crosshead extension 2 in the axial direction to prevent the connection between the crosshead main body 1 and the crosshead extension 2 from breaking, thereby effectively increasing the size of the crosshead. The overall strength of the crosshead.

The above are only the preferred embodiments of the present invention. It should be pointed out that for those skilled in the art, without departing from the principles of the present invention, several improvements and modifications can be made. It should be regarded as the protection scope of the present invention.

Claims (9)

1. A split crosshead for a pump, characterized in that it comprises a split crosshead main body, a crosshead extension and a locking part, the left side of the crosshead main body is provided with an inner cavity, and the crosshead main body is provided with an inner cavity. The right side is locked and connected with the crosshead extension through the locking member, the diameter of the crosshead extension is smaller than that of the crosshead main body, and the side wall of the inner cavity of the crosshead main body is symmetrically provided with pin holes. 2 . The split-type crosshead for a pump according to claim 1 , wherein the locking member is a threaded pin, and the crosshead main body and the extended middle of the crosshead are provided with a threaded pin. 3 . suitable screw holes. 3 . The split crosshead for a pump according to claim 2 , wherein a convex stop is provided on the right side of the crosshead main body, and the crosshead extending close to the crosshead main body is provided with a The male notch is adapted to the female notch. 4 . The split crosshead for a pump according to claim 3 , wherein the convex stop and the concave stop are in an interference fit. 5 . 5 . The split-type crosshead for a pump according to claim 1 , wherein the crosshead main body and the crosshead extension are both cylindrical structures. 6 . 6 . The split-type crosshead for a pump according to claim 5 , wherein the main body of the crosshead is cast and formed by an investment casting method. 7 . 7 . The split-type crosshead for a pump according to claim 6 , wherein the crosshead extension is formed by turning. 8 . 8 . The split crosshead for a pump according to claim 7 , wherein the concave stop is a circular slot, and the convex stop is adapted to the circular slot. 9 . Cylindrical bumps. 9 . The split-type crosshead for a pump according to claim 8 , wherein a polygonal slot is opened at the end of the locking member. 10 .

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