A swash plate machining clamp for a plunger variable displacement pump

Abstract

The present application relates to a kind of swash plate machining clamps of plunger variable displacement pump, the clamp includes clamp body, clamp body is connected with clamping assembly, clamping assembly includes pressing assembly and jacking assembly, and the clamping space of clamping swash plate is formed between pressing assembly and jacking assembly, jacking assembly includes positioning body, the upper portion of positioning body is provided with multiple abutting heads, multiple abutting heads are used to resist in different positions of the inner wall of swash plate bottom taper hole, positioning body is driven to lift by jacking drive device, jacking drive device is connected with clamp body, pressing assembly includes pressing plate, pressing plate is driven to lift by pressing drive device, pressing drive device is connected with clamp body, and pressing plate is used to abut on the top surface of swash plate.The present application can quickly and effectively realize the clamping positioning of swash plate, it is convenient to operate, improves the clamping positioning efficiency, and with good positioning accuracy and reliability.

Description

Technical Field

[0001] This invention relates to the field of variable pump machining technology, and in particular to a fixture for machining the swashplate of a plunger variable pump. Background Technology

[0002] Swashplate variable displacement pumps are a commonly used hydraulic power source. The swashplate is a key component of this pump, and its quality directly affects the pump's performance. Therefore, the swashplate is required to have high dimensional and shape accuracy. Swashplates are mostly forged blanks, requiring multiple machining processes to reach the finished product. The first process typically involves machining both end faces of the swashplate. However, due to the irregular shape of the forged blank, clamping is inconvenient, time-consuming, and labor-intensive, resulting in low machining efficiency and an inability to guarantee the machining accuracy of the swashplate, thus failing to effectively meet production requirements. Summary of the Invention

[0003] Therefore, the technical problem to be solved by the present invention is to overcome the defects of the prior art, such as the inconvenience of clamping the swashplate of the plunger variable pump and the low clamping efficiency.

[0004] To solve the above-mentioned technical problems, the present invention provides a fixture for machining the swashplate of a plunger variable pump. The bottom surface of the swashplate has a tapered hole. The fixture includes a fixture body, and a clamping assembly is connected to the fixture body. The clamping assembly includes a pressing assembly and a lifting assembly. A clamping space for clamping the swashplate is formed between the pressing assembly and the lifting assembly. The lifting assembly includes a positioning body. The upper part of the positioning body is provided with multiple abutting heads, which are used to abut against different positions on the inner wall of the tapered hole. The positioning body is driven to move up and down by a lifting drive device, which is connected to the fixture body. The pressing assembly includes a pressure plate, which is driven to move up and down by a pressing drive device, which is connected to the fixture body. The pressure plate is used to abut against the top surface of the swashplate.

[0005] In one embodiment of the present invention, the positioning body includes a first positioning member and a second positioning member. The second positioning member is slidably connected inside the first positioning member. The first positioning member is slidably connected to a first base. The first base is connected to the clamp body through a second base. The upper two sides of the first positioning member are provided with outwardly protruding abutment heads. The upper two sides of the second positioning body are also provided with outwardly protruding abutment heads.

[0006] In one embodiment of the present invention, the lifting drive device includes a first drive block, a second drive block, and a plurality of push rods. A plurality of through holes are provided on the second base, each corresponding to a push rod. Each push rod passes through a corresponding through hole. At least one push rod abuts against the bottom of the second positioning member, and another push rod abuts against the bottom of the first positioning member. All push rods are located above the first drive block. The first drive block drives the push rods to rise and fall. The first drive block is slidably connected to a guide seat, which is connected to the lower part of the clamp body. A second drive block is also connected to the guide seat. A second inclined surface is formed on the second drive block, and a first inclined surface is formed inside the first drive block. The first inclined surface abuts against the second inclined surface. The first drive block is driven to rise and fall by the second drive block, and the second drive block is driven to move horizontally by a horizontal hydraulic cylinder.

[0007] In one embodiment of the present invention, a first spring is sleeved on the top rod, one end of the first spring is connected to the lower part of the top rod, and the other end abuts against the bottom surface of the second base.

[0008] In one embodiment of the present invention, the clamp body is provided with a receiving cavity, the receiving cavity accommodating a plurality of rollers to form a floating assembly, the lower part of the push rod extends into the receiving cavity, the floating assembly is located between the push rod and the first driving block, and the rollers in the floating assembly are driven by the first driving block to float up and down.

[0009] In one embodiment of the present invention, the downward driving device includes a vertical shaft, the upper part of which is connected to a vertical hydraulic cylinder via a connecting plate, the lower part of which is connected to a pressure plate via a pressure cover, a gasket connected to the upper part of the pressure plate, a spherical recess formed on the gasket, a spherical protrusion formed at the bottom of the vertical shaft, the vertical shaft passing through the pressure cover, and the spherical protrusion located in the spherical recess.

[0010] In one embodiment of the present invention, an anti-rotation pin is also connected between the connecting plate and the pressure plate.

[0011] In one embodiment of the present invention, a third positioning member and a fourth positioning member are provided on the second base, and the first base is located between the third positioning member and the fourth positioning member. A positioning shaft is connected to both the third positioning member and the fourth positioning member, and the positioning shaft is used to abut against the bottom surface of the swashplate.

[0012] In one embodiment of the present invention, an adjusting shaft is also connected to the third positioning member. Both ends of the adjusting shaft are formed with a fourth inclined surface. Two positioning shafts are provided on the third positioning member. Both positioning shafts can slide up and down along the third positioning member, and the lower end face of each positioning shaft is formed with a third inclined surface. The fourth inclined surface at one end of the adjusting shaft abuts against the third inclined surface of one positioning shaft, and the fourth inclined surface at the other end of the adjusting shaft abuts against the third inclined surface of the other positioning shaft.

[0013] In one embodiment of the present invention, one end of the clamp body is connected to a first fixed plate and the other end is connected to a second fixed plate. The first fixed plate is rotatably connected to a turntable, and the second fixed plate is rotatably connected to a tailstock.

[0014] The technical solution of the present invention has the following advantages compared with the prior art:

[0015] The swashplate for machining the variable displacement pump described in this invention can quickly and effectively clamp and position the swashplate, is easy to operate, improves clamping and positioning efficiency, and has good positioning accuracy and reliability, which helps to ensure the machining efficiency and precision of the swashplate. Attached Figure Description

[0016] To make the content of this invention easier to understand, the invention will be further described in detail below with reference to specific embodiments and accompanying drawings.

[0017] Figure 1 This is a schematic diagram of the fixture for machining the swashplate of the plunger variable pump of the present invention;

[0018] Figure 2 yes Figure 1 Front view of the fixture used for machining swashplates;

[0019] Figure 3 yes Figure 2 Top view of the fixture used for machining swashplates;

[0020] Figure 4 yes Figure 2 A magnified view of a section at point Z;

[0021] Figure 5 yes Figure 2 Sectional view at point AA;

[0022] Figure 6 yes Figure 1 A schematic diagram of the structure of the clamping component;

[0023] Figure 7 yes Figure 6 Lifting principle diagram of the central lifting component;

[0024] Figure 8 yes Figure 7 A schematic diagram of the structure after removing the first base and guide seat;

[0025] Figure 9 This is a schematic diagram showing the fit between the positioning shaft and the adjusting shaft;

[0026] Figure 10 This is a schematic diagram of the swashplate structure;

[0027] Figure 11 This is a schematic diagram of the swashplate from another angle;

[0028] Explanation of reference numerals in the instruction manual:

[0029] 1. Swashplate; 11. Tapered hole;

[0030] 2. Fixture body; 21. Receiving cavity;

[0031] 3. Clamping components;

[0032] 31. Pressing assembly; 311. Pressure plate; 312. Pressing drive device; 3121. Vertical shaft; 31211. Spherical protrusion; 3122. Connecting plate; 3123. Vertical hydraulic cylinder; 3124. Pressure cap; 31241. Shaft cavity; 3125. Gasket; 312. Anti-rotation pin;

[0033] 32. Lifting assembly; 321. Positioning body; 3211. Abutting head; 3212. First positioning component; 32121. First limiting groove; 3213. Second positioning component; 32131. Second limiting groove; 3214. Abutting rod; 322. First base; 323. Second base; 3231. Through hole; 3232. Opening groove; 324. Guide seat; 325. Lifting drive device; 3251. First drive block; 32511. First inclined surface; 3252. Second drive block; 32521. Second inclined surface; 3253. Push rod; 3254. Horizontal hydraulic cylinder; 3255. Screw; 3256. First spring; 3257. Second spring; 326. Roller; 327. Limiting screw; 328. Limiting block;

[0034] 33. Third positioning component; 331. Positioning shaft; 3311. Third inclined surface; 332. Adjusting shaft; 3321. Fourth inclined surface;

[0035] 34. Fourth positioning component;

[0036] 4. First fixing plate; 5. Second fixing plate; 6. Turntable; 7. Tailstock; 8. Base plate. Detailed Implementation

[0037] The present invention will be further described below with reference to the accompanying drawings and specific embodiments, so that those skilled in the art can better understand and implement the present invention. However, the embodiments described are not intended to limit the present invention.

[0038] Reference Figures 1-4 As shown, this embodiment discloses a jig for machining the swashplate of a plunger variable pump. The bottom surface of the swashplate 1 has a tapered hole 11. The jig includes a jig body 2, and a clamping assembly 3 is connected to the jig body 2. The clamping assembly 3 includes a pressing assembly 31 and a lifting assembly 32. A clamping space for clamping the swashplate 1 is formed between the pressing assembly 31 and the lifting assembly 32. The lifting assembly 32 includes a positioning body 321. A plurality of abutting heads 3211 are provided on the upper part of the positioning body 321. The plurality of abutting heads 3211 are used to abut against different positions on the inner wall of the tapered hole 11. The positioning body 321 is driven to rise and fall by a lifting drive device 325. The lifting drive device 325 is connected to the jig body. The pressing assembly 31 includes a pressure plate 311. The pressure plate 311 is driven to rise and fall by a pressing drive device 312. The pressing drive device 312 is connected to the jig body. The pressure plate 311 is used to abut against the top surface of the swashplate 1.

[0039] The above structure can quickly and effectively clamp and position the swashplate 1 by the opposing movement of the pressing component 31 and the lifting component 32. The cone hole 11 of the swashplate 1 is positioned by the multiple contact heads 3211 of the positioning body 321, and the swashplate 1 is pressed onto the positioning body 321 by the pressure plate 311, so that the swashplate 1 can be accurately positioned and has good positioning reliability. This not only improves the convenience of clamping, but also improves the clamping quality.

[0040] In one implementation, such as Figures 2-4 As shown, the positioning body 321 includes a first positioning member 3212 and a second positioning member 3213. The second positioning member 3213 is slidably connected to the inside of the first positioning member 3212. The first positioning member 3212 is slidably connected to the first base 322. The first base 322 is connected to the clamp body 2 through the second base 323. The upper two sides of the first positioning member 3212 are provided with outwardly protruding abutment heads 3211. The upper two sides of the second positioning body are also provided with outwardly protruding abutment heads 3211.

[0041] Understandably, the outward convex directions of the contact heads 3211 on the first and second positioning bodies are different, so that the contact heads 3211 can abut against different positions on the inner wall of the tapered hole 11 at the bottom of the swashplate 1. For example, as Figures 7-8 As shown, one of the contact heads 3211 on both sides of the upper part of the second positioning member 3213 protrudes forward and the other protrudes backward, and one of the contact heads 3211 on both sides of the upper part of the first positioning member 3212 protrudes to the left and the other protrudes to the right. The upper parts of the first positioning member 3212 and the second positioning member 3213 form a cross shape.

[0042] Four-point positioning is achieved by having two abutting heads 3211 on the first positioning member 3212 and two abutting heads 3211 on the second positioning member 3213 abutting at different positions on the inner wall of the cone hole 11 at the bottom of the swashplate 1. This also facilitates the alignment of the swashplate 1. The position of the cone hole 11 is shown in [reference needed]. Figures 10-11 .

[0043] The two abutments 3211 on the first positioning member 3212 can be arranged symmetrically, and the two abutments 3211 on the second positioning member 3213 can also be arranged symmetrically.

[0044] Furthermore, such as Figure 4 As shown, the upper two sides of the first positioning member 3212 are detachably connected to abutment rods 3214, and the ends of the abutment rods 3214 form the abutment heads 3211. The abutment rods 3214 and the first positioning member 3212 can be connected by threads.

[0045] The contact heads 3211 on both sides of the upper part of the second positioning member 3213 and the second positioning member 3213 can be integrally formed.

[0046] In one embodiment, the contact head 3211 is arc-shaped to better abut against the inner wall of the tapered hole 11.

[0047] In one implementation, such as Figure 4 As shown, the lifting drive device 325 includes a first drive block 3251, a second drive block 3252, and a plurality of push rods 3253. The second base 323 is provided with a plurality of through holes 3231, and the through holes 3231 and the push rods 3253 correspond one to one. The push rods 3253 are inserted into the corresponding through holes 3231. At least one push rod 3253 abuts against the bottom of the second positioning member 3213 to push the second positioning member 3213 to rise and fall. Another push rod 3253 abuts against the bottom of the first positioning member 3212 to push the first positioning member 3212 to rise and fall.

[0048] The push rods 3253 are all located above the first drive block 3251. The push rods 3253 are driven to rise and fall by the first drive block 3251. The first drive block 3251 is slidably connected to the inside of the guide seat 324. The guide seat 324 is connected to the lower part of the clamp body 2. The guide seat 324 is also connected to the second drive block 3252. The second drive block 3252 has a second inclined surface 32521. The first drive block 3251 has a first inclined surface 32511 inside. The first inclined surface 32511 abuts against the second inclined surface 32521.

[0049] The first drive block 3251 is driven to rise and fall by the second drive block 3252, and the second drive block 3252 is driven to move horizontally by the horizontal hydraulic cylinder 3254.

[0050] A wedge-shaped mechanism is formed between the first inclined surface 32511 and the second inclined surface 32521. When the second drive block 3252 is pushed horizontally by the horizontal hydraulic cylinder 3254, the first drive member will move up and down under the action of the inclined surface because the second inclined surface 32521 abuts against the first inclined surface 32511, thereby driving the push rod 3253 to move up and down in the corresponding through hole 3231.

[0051] In one embodiment, the horizontal hydraulic cylinder 3254 and the second drive block 3252 are connected by a screw 3255.

[0052] In one embodiment, two push rods 3253 may be provided at the lower part of the first positioning member 3212 for pushing to ensure lifting stability.

[0053] In one embodiment, a first spring 3256 is sleeved on the lower part of the push rod 3253. One end of the first spring 3256 is connected to the lower part of the push rod 3253, and the other end abuts against the bottom surface of the second base 323, so as to realize the reset of the push rod 3253 by means of the first spring 3256.

[0054] Furthermore, a second spring 3257 is sleeved on the upper part of the push rod 3253, and an opening groove 3232 is provided on the upper part of the second base 323. One end of the second spring 3257 abuts against the bottom of the opening groove 3232, and the other end abuts against the positioning body 321. It can be understood that the top end of the second spring 3257 on the push rod 3253 used to push the second positioning member 3213 to rise and fall abuts against the bottom of the second positioning member 3213, and the top end of the second spring 3257 on the push rod 3253 used to push the first positioning member 3212 to rise and fall abuts against the bottom of the second positioning member 3213.

[0055] The cooperation of the first spring 3256 and the second spring 3257 can better ensure the reset of the push rod 3253.

[0056] In one embodiment, the fixture body 2 is provided with a receiving cavity 21, which contains a plurality of rollers 326 to form a floating assembly. The lower part of the push rod 3253 extends into the receiving cavity 21. The floating assembly is located between the push rod 3253 and the first drive block 3251. The first drive block 3251 drives the rollers 326 in the floating assembly to float up and down, so that each push rod 3253 can float up and down.

[0057] The above structure can achieve the floating and lifting of different top rods 3253 through multiple rollers 326 in the floating component, so that the corresponding first positioning member 3212 and second positioning member 3213 can float and align the clamping position of the swashplate 1, thereby improving the positioning and clamping effect.

[0058] Specifically, the multiple rollers 326 in the accommodating cavity 21 can be arranged in multiple rows. For example, two layers can be arranged, with three rollers 326 in the upper layer and two rollers 326 in the lower layer.

[0059] In one implementation, such as Figure 4 As shown, the second positioning member 3213 is provided with a second limiting groove 32131, and the first positioning member 3212 is connected with a limiting screw 327. The limiting screw 327 extends into the second limiting groove 32131, and the length of the second limiting groove 32131 is greater than the diameter of the limiting screw 327, so as to limit the rotation and vertical movement distance of the second positioning member 3213.

[0060] In one embodiment, both sides of the first base 322 are connected to limit blocks 328 (square), and both sides of the first positioning member 3212 are provided with first limiting grooves 32121, with the first limiting grooves 32121 and the limiting blocks 328 corresponding one-to-one. Figure 5 and Figure 8 As shown, the limiting block 328 extends into the corresponding first limiting groove 32121, and the length of the second limiting groove 32131 is greater than the thickness of the limiting block 328, so as to limit the rotation and vertical movement distance of the first positioning member 3212.

[0061] In one implementation, such as Figures 4-5 As shown, the downward pressure drive device 312 includes a vertical shaft 3121. The upper part of the vertical shaft 3121 is connected to the vertical hydraulic cylinder 3123 via a connecting plate 3122. The lower part of the vertical shaft 3121 is connected to the pressure plate 311 via a pressure cover 3124. A gasket 3125 is connected to the upper part of the pressure plate 311. A spherical recess is formed on the gasket 3125. A spherical protrusion 31211 is formed at the bottom of the vertical shaft 3121. The vertical shaft 3121 passes through the pressure cover 3124, and the spherical protrusion 31211 is located in the spherical recess. A floating fit is achieved through the spherical protrusion 31211 and the spherical recess, which facilitates automatic centering and floating pressure on the swashplate 1.

[0062] Understandably, a shaft cavity 31241 is formed on the pressure cap 3124, and the vertical shaft 3121 passes through the shaft cavity 31241. The inner diameter of the shaft cavity 31241 is larger than the outer diameter of the vertical shaft 3121 inside the shaft cavity 31241, so that the vertical shaft 3121 and the gasket 3125 can float slightly. That is, the floating fit is achieved through the spherical protrusion 31211 and the spherical recess, so that the pressure plate 311 floats and presses the swashplate 1.

[0063] The aforementioned downward driving device 312 is driven by a vertical hydraulic cylinder 3123 to lower the vertical shaft 3121, thereby causing the pressure plate 311 to descend and press the swashplate 1.

[0064] In one embodiment, an anti-rotation pin 312 is also connected between the connecting plate 3122 and the pressure plate 311 to prevent the pressure plate 311 from rotating.

[0065] In one implementation, such as Figure 1 and Figure 6 As shown, a third positioning element 33 and a fourth positioning element 34 are provided on the second base 323, and the first base 322 is located between the third positioning element 33 and the fourth positioning element 34. Positioning shafts 331 are connected to both the third positioning element 33 and the fourth positioning element 34. The positioning shafts 331 are used to abut against the bottom surface of the swashplate 1.

[0066] In one embodiment, an adjusting shaft 332 is also connected to the third positioning member 33. The adjusting shaft 332 passes through the third positioning member 33 and is movable. The positioning shafts 331 on the third positioning member 33 can slide up and down along the third positioning member 33. Figure 9 As shown, both ends of the adjusting shaft 332 have a fourth inclined surface 3321. The third positioning member 33 is provided with two positioning shafts 331. The lower end face of the positioning shafts 331 on the third positioning member 33 has a third inclined surface 3311. The fourth inclined surface 3321 at one end of the adjusting shaft 332 abuts against the third inclined surface 3311 of one positioning shaft 331, and the fourth inclined surface 3321 at the other end of the adjusting shaft 332 abuts against the third inclined surface 3311 of the other positioning shaft 331.

[0067] When the bottom surface of the swashplate 1 is uneven, the height of the two positioning shafts 331 on the third positioning component 33 can be automatically adjusted by the inclined surface action of the adjusting shaft 332. For example, if the front side of the bottom surface of the swashplate is lower and the rear side is higher, then after the swashplate contacts the positioning shaft 331 on the front side, the positioning shaft 331 on that side will be lowered, thereby driving the adjusting shaft 332 to move horizontally, causing the positioning shaft 331 on the rear side to rise, so that both the front and rear positioning shafts 331 on the third positioning component 33 are in contact with the swashplate, thereby better ensuring the stability of the swashplate support.

[0068] Furthermore, the third positioning element 33 is provided with a mounting hole, through which the adjusting shaft 332 passes and can move along the mounting hole. Bolts can also be installed at both ends of the mounting hole to provide a sealing and dustproof function.

[0069] Furthermore, the inclination angles of the third inclined plane 3311 and the fourth inclined plane 3321 are both 45°.

[0070] In specific settings, two fourth positioning components 34 and one third positioning component 33 can be set. Each fourth positioning component 34 is equipped with a positioning shaft 331, and the height of the positioning shaft 331 on the fourth positioning component 34 is fixed. The third positioning component is equipped with two positioning shafts 331 with adjustable height, for a total of four positioning shafts 331, so as to achieve four-point support for the swashplate, thereby better ensuring processing stability.

[0071] When a batch of swashplates 1 is clamped, the positioning body 321 and the first swashplate 1 are aligned by using the top rod 3253, and the height of the positioning shaft 331 is adjusted. Subsequent batch processing of swashplates 1 does not require further adjustment, as the pressure plate 311 can press the swashplates 1 together to improve processing efficiency.

[0072] In one implementation, such as Figures 1-3 As shown, one end of the clamp body 2 is fixed to the first fixed plate 4, and the other end is fixed to the second fixed plate 5. The first fixed plate 4 is rotatably connected to the turntable 6, and the second fixed plate is rotatably connected to the tailstock 7.

[0073] The rotation of the turntable 6 will cause the first fixed plate 4 to rotate, thereby causing the fixture body 2 and its clamping components 3 to rotate together, and also causing the second fixed plate 5 to rotate together.

[0074] With the above structure, the turntable 6 can drive the fixture body 2 and its clamping components 3 to rotate together to adapt to the swashplate 1 in different positions and meet the needs of different machining positions; it is also convenient to place the above structure in vertical machining centers, horizontal machining centers or other special equipment.

[0075] Furthermore, both the turntable 6 and the tailstock 7 are connected to the base plate 8.

[0076] In one embodiment, anti-slip textures are provided on the contact surface between the pressure plate 311 and the swash plate 1.

[0077] In one embodiment, the clamp body 2 is provided with a plurality of clamping components 3, such as Figure 1 As shown, the fixture body 2 is equipped with three clamping components 3 to enable multiple swashplate 1 workpieces to be clamped at one time for processing, thereby improving processing efficiency and reducing processing costs.

[0078] In one implementation, such as Figure 11 As shown, the conical hole 11 on the bottom surface of the swash plate 1 is an elliptical conical hole.

[0079] The following example illustrates the usage of the clamp in the above embodiment: The swashplate 1 of the plunger variable pump is placed between the pressing assembly 31 and the lifting assembly 32. The horizontal hydraulic cylinder 3254 is activated, which pushes the second drive block 3252 to move, thereby causing the first drive block 3251 to rise. This, in turn, causes each roller 326 and each push rod 3253 to float and move upward together. Thus, the push rod 3253 pushes the first positioning member 3212 and the second positioning member 3213 in the positioning body 321 to move upward until the corresponding contact head 3211 abuts against the inner wall of the tapered hole 11 at the lower part of the swashplate 1. At the same time, the vertical hydraulic cylinder 3123 drives the pressure plate 311 in the pressing assembly 31 to descend until it is pressed against the upper surface of the swashplate 1, thereby achieving the clamping and positioning of the swashplate 1. In addition, during the above clamping and positioning process, the bottom of the swashplate 1 also abuts against the positioning shaft 331 of the third positioning member 33 and the fourth positioning member 34 to better ensure the reliability of positioning.

[0080] The fixture for machining the swashplate of the plunger variable pump described in the above embodiment can quickly and effectively achieve the clamping and positioning of the swashplate. It is easy to operate, highly automated, improves the clamping and positioning efficiency, and has good positioning accuracy and reliability, which helps to ensure the machining efficiency and precision of the swashplate.

[0081] Obviously, the above embodiments are merely illustrative examples for clear explanation and are not intended to limit the implementation. Those skilled in the art will recognize that other variations or modifications can be made based on the above description. It is neither necessary nor possible to exhaustively list all possible implementations here. However, obvious variations or modifications derived therefrom are still within the scope of protection of this invention.

Claims

1. A fixture for machining the swashplate of a variable displacement piston pump, wherein a tapered hole is formed on the bottom surface of the swashplate, characterized in that: The clamp includes a clamp body with a clamping assembly connected to it. The clamping assembly includes a pressing component and a lifting component, forming a clamping space between the pressing component and the lifting component to clamp the swashplate. The lifting component includes a positioning body with multiple abutment heads on its upper part. These abutment heads are used to abut against different positions on the inner wall of the tapered hole. The positioning body is driven to move up and down by a lifting drive device connected to the clamp body. The pressing component includes a pressure plate, which is driven to move up and down by the pressing component. The lifting mechanism is driven by a moving device. The downward driving device is connected to the clamp body. The pressure plate is used to abut against the top surface of the swashplate. The positioning body includes a first positioning member and a second positioning member. The second positioning member is slidably connected to the inside of the first positioning member. The first positioning member is slidably connected to the first base. The first base is connected to the clamp body through the second base. The upper two sides of the first positioning member are provided with outwardly protruding abutment heads. The upper two sides of the second positioning member are also provided with outwardly protruding abutment heads.

2. The fixture for machining the swashplate of the variable displacement piston pump according to claim 1, characterized in that: The lifting drive device includes a first drive block, a second drive block, and multiple push rods. The second base has multiple through holes, each corresponding to a push rod. Each push rod passes through a corresponding through hole. At least one push rod abuts against the bottom of the second positioning member, and another push rod abuts against the bottom of the first positioning member. All push rods are located above the first drive block. The first drive block drives the push rods to rise and fall. The first drive block is slidably connected to a guide seat, which is connected to the lower part of the clamp body. The guide seat is also connected to the second drive block. The second drive block has a second inclined surface, and the first drive block has a first inclined surface inside. The first inclined surface abuts against the second inclined surface. The first drive block is driven to rise and fall by the second drive block, and the second drive block is driven to move horizontally by a horizontal hydraulic cylinder.

3. The fixture for machining the swashplate of a plunger variable pump according to claim 2, characterized in that: A first spring is fitted on the top rod, with one end of the first spring connected to the lower part of the top rod and the other end abutting against the bottom surface of the second base.

4. The fixture for machining the swashplate of the plunger variable pump according to claim 2, characterized in that: The fixture body is provided with a receiving cavity, which contains a plurality of rollers to form a floating assembly. The lower part of the push rod extends into the receiving cavity. The floating assembly is located between the push rod and the first drive block, and the rollers in the floating assembly are driven by the first drive block to float up and down.

5. The fixture for machining the swashplate of the plunger variable pump according to claim 1, characterized in that: The downward driving device includes a vertical shaft. The upper part of the vertical shaft is connected to a vertical hydraulic cylinder via a connecting plate. The lower part of the vertical shaft is connected to a pressure plate via a pressure cover. A gasket is connected to the upper part of the pressure plate. A spherical recess is formed on the gasket. A spherical protrusion is formed at the bottom of the vertical shaft. The vertical shaft passes through the pressure cover, and the spherical protrusion is located in the spherical recess.

6. The fixture for machining the swashplate of a plunger variable pump according to claim 5, characterized in that: An anti-rotation pin is also connected between the connecting plate and the pressure plate.

7. The fixture for machining the swashplate of the plunger variable pump according to claim 1, characterized in that: The second base is provided with a third positioning component and a fourth positioning component, and the first base is located between the third positioning component and the fourth positioning component. The third positioning component and the fourth positioning component are each connected with a positioning shaft, which is used to abut against the bottom surface of the swashplate.

8. The fixture for machining the swashplate of the plunger variable pump according to claim 7, characterized in that: The third positioning component is also connected to an adjusting shaft. Both ends of the adjusting shaft have a fourth inclined surface. The third positioning component is provided with two positioning shafts. Both positioning shafts can slide up and down along the third positioning component, and the lower end face of each positioning shaft has a third inclined surface. The fourth inclined surface at one end of the adjusting shaft abuts against the third inclined surface of one positioning shaft, and the fourth inclined surface at the other end of the adjusting shaft abuts against the third inclined surface of the other positioning shaft.

9. The fixture for machining the swashplate of the plunger variable pump according to claim 1, characterized in that: One end of the clamp body is connected to the first fixed plate, and the other end is connected to the second fixed plate. The first fixed plate is rotatably connected to the turntable, and the second fixed plate is rotatably connected to the tailstock.

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