Hydraulic pump return plate machining equipment

Abstract

The invention relates to hydraulic pump return plate machining equipment, and belongs to the technical field of machining. The equipment aims to solve the problems that in the prior art, a return plate is prone to deformation during machining, and grinding precision is insufficient. The equipment comprises a rack, a limiting unit, a lifting mechanism and a grinding mechanism. Wherein the limiting unit is matched with the limiting groove through a clamping assembly to limit horizontal and vertical movement of the blank piece; the grinding mechanism comprises a plurality of grinding execution units rotating synchronously, and precise machining of an inner cavity of the blank is achieved through a rotary grinding assembly. A positioning adjusting module of the clamping assembly is provided with an avoiding structure and can be matched with a to-be-machined hole site of the blank. The grinding execution unit adopts a reverse rotation design, so that the machining efficiency and precision are improved; in addition, the vertical movement of the grinding mechanism is accurately controlled through the lifting mechanism, and the equipment is suitable for machining blanks with different heights; the method has the advantages of high machining precision, wide application range, convenience in operation and the like.

Description

Technical Field

[0001] The present invention belongs to the technical field of machining, and particularly relates to a machining device for a hydraulic pump return disk. Background Art

[0002] In the field of machining, especially in the machining process of parts with high precision requirements, the clamping, positioning, and grinding of blank parts have always been key links. The return disk in a hydraulic pump is a common component of the hydraulic pump. It has a disk-shaped structure with a circular hole in the middle, and a plurality of holes are evenly distributed in a ring around the circular hole. During the machining process of the return disk, relatively precise turning and grinding treatments are required. The existing machining equipment uses a three-jaw chuck to fix the blank part, and then grinds through the circular hole of the blank part from above. However, since the blank part of the return disk is relatively thin, it is extremely easy to deform during the machining process, making it difficult to ensure the grinding accuracy and the quality of the finished product. Summary of the Invention

[0003] In order to make up for the deficiencies of the prior art and solve the problems of easy deformation and low grinding accuracy of the return disk during the machining process.

[0004] The present invention provides a machining device for a hydraulic pump return disk, comprising: a frame, which has an installation cavity inside and a machining platform at the top; a limiting unit, including a limiting groove provided on the machining platform and clamping components symmetrically distributed on both sides of the limiting groove, and a grinding channel penetrating through to the installation cavity is provided at the bottom of the limiting groove; a lifting mechanism, vertically arranged in the installation cavity, including a lifting driving component and a lifting table linked with the lifting driving component; a grinding mechanism, including a power component and a rotary grinding component, the rotary grinding component includes a plurality of grinding execution units that can rotate synchronously, the clamping components cooperate with the limiting groove to limit the movement of the blank part in the horizontal and vertical directions, and the power component drives the grinding execution units to extend into the inner cavity of the blank part through the grinding channel for grinding.

[0005] Further, the clamping component includes: a driving part, fixed on the side of the machining platform; an arc-shaped clamping part, connected to the output end of the driving part, and the inner arc surface thereof is shaped to fit the outer periphery of the blank part; a positioning and adjusting module, including a limiting plate extending above the blank part, and the limiting plate is provided with an avoidance structure adapted to the hole positions to be machined of the blank part.

[0006] Further, the positioning and adjusting module forms an assembly structure with adjustable height with the arc-shaped clamping part through an adjustable connecting part, and the avoidance structure is a guiding arc edge provided at the end of the limiting plate, and the inner circle thereof is tangent to the distribution circumference of the hole positions to be machined on the surface of the blank part.

[0007] Furthermore, the rotary grinding assembly includes: a transmission box body slidably disposed in the installation cavity; a driving gear connected to the output shaft of the power assembly is provided in the transmission box body, and a plurality of driven gears circumferentially distributed around the driving gear and meshing with the driving gear; the grinding execution unit includes a rotating shaft rod coaxially connected to the driving gear and the driven gears, and a grinding unit hinged to the side wall of the rotating shaft rod, wherein the grinding unit rotates in the opposite direction to the rotating shaft rod, and the rotation of the rotating shaft rod provides power for the grinding unit to rotate in the opposite direction.

[0008] Furthermore, the grinding unit includes: a hinged arm, one end of which is hinged to the rotating shaft rod; a grinding head rotatably disposed at the free end of the hinged arm; a reverse transmission mechanism, including a first bevel gear box disposed at the top of the rotating shaft rod, a second bevel gear box disposed at the connection end of the grinding head, and a flexible transmission shaft connecting the two bevel gear boxes.

[0009] Furthermore, an angle limiting mechanism is provided on the rotating shaft rod to limit the rotation angle of the hinged arm. The angle limiting mechanism includes a fixing rod and a screw. One end of the fixing rod is fixed to the rotating shaft, and a through screw hole is opened at the other end of the fixing rod. The screw is adjustably disposed in the screw hole. During the rotation of the hinged arm around its hinge point, one end of the screw abuts against the hinged arm to limit its further rotation.

[0010] Furthermore, the lifting drive assembly includes: a double-thread drive module, including two parallel lead screws and a lifting motor for driving each lead screw respectively; a guiding slide rail disposed above the lifting table, which cooperates with the lifting table to realize slidable support for the power mechanism; threaded sleeves matching the lead screws are provided at both ends of the lifting table and are driven to move up and down by the lifting motor.

[0011] Furthermore, the power assembly includes a waterproof motor and a spline coupling, and the output end of the spline coupling extends into the transmission box body and is connected to the driving gear.

[0012] The beneficial effects of the present invention are as follows:

[0013] 1. The cooperation between the clamping assembly and the limiting groove can limit the movement of the blank in the horizontal and vertical directions, ensuring that the position of the blank is accurate and stable during the processing. The limiting plate of the positioning and adjusting module is provided with an avoidance structure adapted to the hole positions to be processed on the blank, and the avoidance structure is a guiding arc edge, the curvature radius of which is tangent to the distribution circumference of the hole positions to be processed on the surface of the blank. This precise positioning and avoidance design can ensure that the grinding execution unit accurately aligns with the processing position of the inner cavity of the blank, effectively improving the processing accuracy.

[0014] 2. The rotary grinding assembly includes multiple grinding execution units that can rotate synchronously, and the polishing unit rotates in the opposite direction to the rotating shaft rod. This structure makes the grinding process more stable and uniform. When grinding parts with high precision requirements such as the return disc of a grinding hydraulic pump, it can reduce dimensional deviations caused by factors such as changes in grinding force, and ensure the shape accuracy and dimensional accuracy of the machined surface.

[0015] 3. Since it is necessary to gradually cut into the surface of the blank part during the grinding process, the present application adjusts the magnitude of the centrifugal force by controlling the rotational speed, so that the grinding head can gradually expand outward until it reaches the set grinding aperture during the grinding process. An angle limit mechanism is provided between the articulated arm and the rotating shaft rod, which can prevent the articulated arm from swinging excessively. That is, the present application can adjust the grinding range of the grinding head by adjusting the angle limit mechanism in cooperation with the rotational speed of the motor, and thus can adapt to grinding of different apertures, improving the application range and operation convenience of the equipment.

[0016] 4. The rotary grinding assembly has several grinding execution units that can rotate synchronously, which means that during a single grinding stroke, multiple parts of the blank part can be ground simultaneously. Compared with the traditional single-point grinding method, the processing efficiency is greatly improved, especially suitable for batch processing of parts such as the return disc of a hydraulic pump with multiple similar grinding parts. The lifting mechanism can precisely control the vertical movement of the lifting table, enabling the grinding mechanism to quickly and accurately reach the processing position, and can also quickly adjust the position of the grinding mechanism when processing blank parts at different heights, reducing non-processing time and further improving the overall processing efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The present invention will be further described below with reference to the accompanying drawings.

[0018] Figure 1 is a schematic structural diagram of the whole of the present invention;

[0019] Figure 2 is a schematic structural diagram of the polishing unit of the present invention;

[0020] Figure 3 is a schematic structural diagram of one of the embodiments of the present invention;

[0021] Figure 4 is a top view of the polishing unit of the present invention radially sectioned;

[0022] Figure 5 is a top view of another working mode of the polishing unit of the present invention radially sectioned;

[0023] In the figure: 1, frame; 11, installation cavity; 12, processing platform; 2, limiting unit; 21, limiting groove; 211, grinding channel; 22, clamping assembly; 221, driving member; 222, arc-shaped clamping portion; 223, positioning and adjusting module; 223a, limiting plate; 223b, adjustable connecting member; 223c, avoidance structure; 3, lifting mechanism; 31, lifting driving assembly; 32, lifting table; 4, grinding mechanism; 41, power assembly; 42, rotary grinding assembly; 5, rotating shaft rod; 6, polishing unit; 61, articulated arm; 62, polishing head; 63, reverse transmission mechanism; 631, flexible transmission shaft; 7, angle limiting mechanism; 71, fixed rod; 72, screw; 8, blank part. Specific embodiments

[0024] In order to make the technical means, creative features, achieved purposes and functions of the present invention easy to understand, the present invention will be further described below in conjunction with specific embodiments.

[0025] As Figures 1-5 shown, the present invention discloses a processing device for a hydraulic pump return disc, including: a frame 1, with an installation cavity 11 formed inside and a processing platform 12 provided on the top; a limiting unit 2, including a limiting groove 21 provided on the processing platform 12 and clamping assemblies 22 symmetrically distributed on both sides of the limiting groove 21, and a grinding channel 211 penetrating through to the installation cavity 11 is provided at the bottom of the limiting groove 21; a lifting mechanism 3, vertically arranged in the installation cavity 11, including a lifting driving assembly 31 and a lifting table 32 linked with the lifting driving assembly 31; a grinding mechanism 4, including a power assembly 41 and a rotary grinding assembly 42, the rotary grinding assembly 42 includes a plurality of grinding execution units that can rotate synchronously, the clamping assembly 22 cooperates with the limiting groove 21 to limit the movement of the blank part 8 in the horizontal and vertical directions, and the power assembly 41 drives the grinding execution unit to extend into the inner cavity of the blank part 8 through the grinding channel 211 for grinding processing.

[0026] During operation, first place the blank 8 of the hydraulic pump return disk to be machined on the machining platform 12 and cooperate with the limiting groove 21, and then clamp it through the clamping assemblies 22 on both sides of the blank 8 to restrict the movement of the blank 8 in the horizontal and vertical directions, ensuring its stable posture during machining and accurately positioning it at a suitable position. The lifting drive assembly 31 starts to work, driving the associated lifting table 32 to move in the vertical direction. According to the requirements of grinding machining, adjust the lifting table 32 to a suitable height position so that the subsequent grinding mechanism 4 can accurately extend into the corresponding depth of the circular hole of the blank 8 for operation. The power assembly 41 of the grinding mechanism 4 is turned on, driving the rotary grinding assembly 42 to start rotating, and the several synchronously rotatable grinding execution units included therein rotate synchronously. Utilize the relative movement between the rotation of the grinding execution unit and the inner cavity wall of the blank 8 to perform wet grinding on the inner cavity, and remove excess material through the action of abrasives, etc., to meet the required dimensional accuracy and surface quality requirements.

[0027] As one of the embodiments of the present invention, the clamping assembly 22 includes: a driving member 221 fixed to the side of the machining platform 12; an arc-shaped clamping portion 222 connected to the output end of the driving member 221, the inner arc surface shape of which is adapted to the outer periphery of the blank 8; a positioning and adjusting module 223 including a limiting plate 223a extending above the blank 8, and the limiting plate 223a is provided with an avoidance structure 223c adapted to the hole positions to be machined on the blank 8.

[0028] When clamping the blank 8, the output end of the driving member 221 drives the connected arc-shaped clamping portion 222 to move towards the blank 8. Since the inner arc surface shape of the arc-shaped clamping portion 222 is adapted to the outer periphery of the blank 8, with the drive of the driving member 221, it will gradually fit onto the outer peripheral surface of the blank 8, applying a clamping force to the blank 8 in the horizontal direction and restricting the movement of the blank 8 in the horizontal direction to ensure its stable axial position. The limiting plate of the positioning and adjusting module 223 that extends above the blank 8 will play a certain limiting role on the upper part of the blank 8. The avoidance structure 223c provided on the limiting plate and adapted to the hole positions to be machined on the blank 8 can ensure that when clamping and fixing the blank 8, it will not interfere with the subsequent machining operation of the hole positions to be machined on the blank 8 by the grinding mechanism 4, and can also limit the movement of the blank 8 in the vertical direction to a certain extent. Acting together with the arc-shaped clamping portion 222, it realizes the effective restriction of the movement of the blank 8 in the horizontal and vertical directions, ensuring the stable posture of the blank 8 during machining.

[0029] As one of the embodiments of the present invention, the positioning and adjusting module 223 forms an assembly structure with adjustable height with the arc-shaped clamping portion 222 through an adjustable connecting member 223b, and the avoidance structure 223c is a guiding arc edge provided at the end of the limiting plate, the inner circle of which is tangent to the distribution circumference of the hole positions to be machined on the surface of the blank 8.

[0030] During the clamping process, according to the specific height of the blank 8 and the position of the hole to be machined, the height of the positioning and adjusting module 223 can be adjusted. By adjusting the adjustable connecting member 223b, the limiting plate 223a is set at an appropriate height to ensure that the guiding arc edge at the end of the limiting plate 223a can be tangent to the distribution circumference of the holes to be machined on the surface of the blank 8. Such height adjustment can ensure that when the blank 8 is clamped and fixed, the limiting plate will neither be too high to play an effective vertical limiting role for the blank 8 nor be too low to interfere with the placement of the blank 8 and the subsequent machining of other parts by the grinding mechanism 4. The guiding arc edge at the end of the limiting plate serves as the avoidance structure 223c. After the blank 8 is clamped in place, its inner circle is tangent to the distribution circumference of the holes to be machined on the surface of the blank 8. This design enables the limiting plate not to interfere with the grinding execution unit when the grinding mechanism 4 grinds the holes to be machined on the blank 8. The grinding execution unit can smoothly extend into the holes to be machined for precise grinding under the guidance of the guiding arc edge, ensuring the smooth progress of the machining process, and also ensuring the machining accuracy, and avoiding machining errors or equipment failures caused by the obstruction of the limiting plate.

[0031] As one of the embodiments of the present invention, the rotary grinding assembly 42 includes: a transmission box body slidably disposed in the installation cavity 11; a driving gear connected to the output shaft of the power assembly 41 is provided in the transmission box body, and a plurality of driven gears circumferentially distributed around the driving gear and meshing with the driving gear; the grinding execution unit includes a rotating shaft rod 5 coaxially connected to the driving gear and the driven gears, and a grinding unit 6 hinged to the side wall of the rotating shaft rod 5, wherein the grinding unit 6 rotates in the opposite direction to the rotating shaft rod 5, and the rotation of the rotating shaft rod 5 provides the power for the grinding unit 6 to rotate in the opposite direction.

[0032] During operation, each driving gear and driven gear are coaxially connected with a rotating shaft rod 5. When the driven gears rotate driven by the driving gear, all the rotating shaft rods 5 rotate synchronously. The grinding unit 6 is hinged to the side wall of the rotating shaft rod 5. During the rotation of the rotating shaft rod 5, the grinding unit 6 is driven to rotate. This reverse rotation enables the grinding unit 6 to grind the inner cavity surface of the blank 8 in a specific motion mode during the grinding process, which helps to improve the grinding efficiency, improve the grinding quality, and reduce the resistance and heat generation during the grinding process, realizing a more uniform and efficient wet grinding process for the inner cavity wall of the hydraulic pump return disk, meeting the requirements of its precision machining. The number of the grinding execution units includes but is not limited to three shown in the drawings, and is specifically set according to actual requirements. For example, the grinding execution units with the same number as the round holes on the return disk can be used to synchronously grind all the round holes, and only one lifting is required to complete the grinding process.

[0033] As one of the embodiments of the present invention, the grinding unit 6 includes: a hinged arm 61, one end of which is hinged to the rotating shaft rod 5; a grinding head 62 rotatably arranged at the free end of the hinged arm 61; a reverse transmission mechanism 63, which includes a first bevel gear box arranged at the top of the rotating shaft rod 5, a second bevel gear box arranged at the connecting end of the grinding head 62, and a flexible transmission shaft 631 connecting the two bevel gear boxes.

[0034] One end of the hinged arm 61 is connected to the rotating shaft rod 5 in a hinged manner. This connection method enables the hinged arm 61 to swing within a certain range, with a certain degree of flexibility, and can adapt to different processing positions and angle requirements. The grinding head 62 is rotatably arranged at the free end of the hinged arm 61. During the working process, the grinding head 62 can rotate around its own axis. By contacting the inner cavity surface of the blank 8, frictional force is generated to realize the grinding process of the inner cavity surface. Its rotational movement can effectively remove the excess material on the surface of the blank 8 to meet the required dimensional accuracy and surface roughness requirements. The first bevel gear box in the reverse transmission mechanism 63 is arranged at the top of the rotating shaft rod 5. When the rotating shaft rod 5 rotates driven by the driven gear, the power is transmitted into the first bevel gear box. The flexible transmission shaft 631 connects the first bevel gear box and the second bevel gear box, transmitting the power from the first bevel gear box to the second bevel gear box. The design of the flexible transmission shaft 631 enables the power to cross a certain spatial distance and angular change in a complex mechanical structure, ensuring the reliability and stability of power transmission. At the same time, it can also adapt to a certain degree of vibration and offset, improving the service life and reliability of the entire transmission system. The second bevel gear box is arranged at the connecting end of the grinding head 62. After receiving the power transmitted by the flexible transmission shaft 631, through the internal gear meshing relationship, it changes the transmission direction of the power and drives the grinding head 62 to rotate in the opposite direction to the rotating shaft rod 5. This reverse rotation design helps to improve the grinding efficiency, make the wear of the cylindrical grinding head 62 uniform, improve the grinding accuracy, thereby obtaining better processing quality and surface integrity, and avoiding problems such as processing defects and low efficiency caused by the forward friction between the grinding head 62 and the surface of the blank 8.

[0035] As one of the embodiments of the present invention, an angle limiting mechanism is provided on the rotating shaft rod 5 to limit the rotation angle of the hinged arm 61. The angle limiting mechanism 7 includes a fixed rod 71 and a screw 72. One end of the fixed rod 71 is fixed to the rotating shaft 5, and a through screw hole is provided at the other end of the fixed rod. The screw 72 is adjustably arranged in the screw hole. During the rotation of the hinged arm 61 around its hinge point, one end of the screw 72 abuts against the hinged arm 61 to limit its continued rotation.

[0036] When the rotary grinding assembly 42 is working, due to the action of centrifugal force, the articulated arm 61 will rotate around the hinge point with the rotating shaft rod 5, and the grinding head 62 will radially expand due to the rotation of the articulated arm 61. The faster the rotating speed of the rotating shaft rod 5, the farther the distance between the grinding head 62 and the rotating shaft rod 5, which means a larger grinding range. When the articulated arm 61 swings to a certain angle, the screw 72 will come into contact with the articulated arm 61 and produce a blocking effect, thereby restricting the further rotation of the articulated arm 61. By rotating the screw 72, the protruding length of the screw 72 can be changed, and different angle restrictions can be achieved, so as to realize the grinding of the blank 8 with different apertures. At the same time, the angle and position of the contact between the grinding head 62 and the inner cavity surface of the blank 8 are relatively stable, improving the quality and accuracy of the grinding process. By controlling the rotating speed of the rotating shaft rod 5 to provide surplus centrifugal force, it is possible to avoid the influence of liquid resistance on the grinding head 62 resulting in the deviation of the grinding position. In addition, due to the surplus centrifugal force cooperating with the angle limiting mechanism 7, the articulated arm 61 can never rotate to the direction coaxial with the diameter of the rotating shaft rod 5. At this time, the grinding head 62 can provide a pressure to the grinding area, and under the action of this pressure, the grinding efficiency of the grinding head 62 is further improved.

[0037] Reference Figure 4 and Figure 5 In the working state shown, the distance between the grinding head 62 and the rotating shaft rod is limited by the limiting member 71, as Figure 5 The virtual circle shown in is one of them Figure 4 The maximum distance between the grinding head 62 and the rotating shaft rod 5 in is longer than Figure 5 The maximum distance between the grinding head 62 and the rotating shaft rod 5 in, and it can perform grinding in a larger round hole.

[0038] As one of the embodiments of the present invention, the lifting drive assembly 31 includes: a double-thread drive module, including two parallel lead screws and lifting motors respectively driving each lead screw; a guide rail, arranged above the lifting table 32, and cooperating with the lifting table 32 to realize the slidable support of the power mechanism; both ends of the lifting table 32 are provided with threaded sleeves cooperating with the lead screws, and are driven to move up and down by the lifting motors. The power assembly 41 includes a waterproof motor and a spline coupling, and the output end of the spline coupling extends into the transmission box and is connected to the driving gear. Guide rails are connected to both sides of the upper end of the waterproof motor and both sides of the transmission box. The lower end of the waterproof motor is connected to the lifting table 32, and under the drive of the lifting motor, it moves up and down, driving the entire rotary grinding assembly 42 to move up and down, and controlling the rotary grinding assembly 42 to enter and exit the blank 8. The lifting motor drives the lifting table 32 to move up and down, thereby driving the entire rotary grinding assembly 42 to move up and down, realizing the precise control of the rotary grinding assembly entering and exiting the blank 8. The grinding process can be flexibly adjusted according to the shape and size of the blank, improving the versatility and adaptability of the equipment.

[0039] The basic principles, main features and advantages of the present invention have been shown and described above. Those skilled in the art should understand that the present invention is not limited by the above embodiments. The above embodiments and the descriptions in the specification only illustrate the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention will have various changes and improvements, and these changes and improvements all fall within the scope of the present invention claimed. The scope of protection of the present invention is defined by the appended claims and their equivalents.

Claims

1. A hydraulic pump return plate processing equipment, characterized in that: include: A frame (1) having a mounting cavity (11) formed therein and a processing platform (12) disposed on the top; A limiting unit (2) comprises a limiting groove (21) provided on the processing platform (12) and clamping components (22) symmetrically distributed on both sides of the limiting groove (21), wherein a grinding channel (211) penetrating to the mounting cavity (11) is provided at the bottom of the limiting groove (21); A lifting mechanism (3) is vertically arranged in the installation cavity (11), comprising a lifting drive component (31) and a lifting platform (32) linked to the lifting drive component (31); The grinding mechanism (4) comprises a power assembly (41) and a rotary grinding assembly (42), wherein the rotary grinding assembly (42) comprises a plurality of synchronously rotatable grinding execution units, the clamping assembly (22) cooperates with the limiting groove (21) to limit the movement of the blank (8) in the horizontal direction and the vertical direction, and the power assembly (41) drives the grinding execution units to extend into the inner cavity of the blank (8) through the grinding channel (211) to perform grinding processing.

2. A hydraulic pump return plate processing equipment according to claim 1, characterized in that: The clamping assembly (22) comprises: A driving member (221) is fixed to the side of the processing platform (12); an arc-shaped clamping portion (222) is connected to the output end of the driving member (221), and its inner arc surface shape is adapted to the outer periphery of the blank (8); The positioning and adjusting module (223) comprises a limiting plate (223a) extending above the blank (8), wherein the limiting plate (223a) is provided with an avoidance structure (223c) adapted to a hole position to be processed in the blank (8).

3. The hydraulic pump return plate processing equipment according to claim 2, characterized in that: The positioning adjustment module (223) forms a height-adjustable assembly structure through an adjustable connecting piece (223b) and an arc-shaped clamping portion (222); the avoidance structure is a guide arc edge arranged at the end of the limiting plate (223a), and its inner circle is tangent to the distribution circle of the holes to be processed on the surface of the blank (8).

4. The hydraulic pump return plate processing equipment according to claim 1, characterized in that: The rotary grinding assembly (42) comprises: A transmission housing is slidably disposed in the mounting cavity (11); a driving gear connected to the output shaft of the power assembly (41) and a plurality of driven gears circumferentially distributed around the driving gear and meshing with the driving gear are disposed in the transmission housing; The grinding execution unit comprises a rotating shaft rod (5) coaxially connected to the driving gear and the driven gear, and a grinding unit (6) hinged to the side wall of the rotating shaft rod (5), wherein the grinding unit (6) rotates in the opposite direction to the rotating shaft rod (5), and the rotation of the rotating shaft rod (5) provides power for the grinding unit (6) to rotate in the opposite direction.

5. The hydraulic pump return plate processing equipment according to claim 4, characterized in that: The polishing unit (6) comprises: An articulated arm (61), one end of which is articulated to the rotating shaft rod (5); A grinding head (62) is rotatably disposed on the free end of the hinged arm (61); The reverse transmission mechanism (63) comprises a first bevel gear box arranged at the top of the rotating shaft (5), a second bevel gear box arranged at the connecting end of the grinding head (62), and a flexible transmission shaft (631) connecting the two bevel gear boxes.

6. The hydraulic pump return plate processing equipment according to claim 5, characterized in that: The rotating shaft rod (5) is provided with an angle limiting mechanism (7) to limit the rotation angle of the hinged arm (61). The angle limiting mechanism (7) comprises a fixing rod (71) and a screw (72). One end of the fixing rod (71) is fixed to the rotating shaft (5). The other end of the fixing rod is provided with a through screw hole. The screw (72) is adjustably arranged in the screw hole. When the hinged arm (61) rotates around its hinge point to the screw (72), one end of the screw (72) contacts the hinged arm (61) to limit its further rotation.

7. The hydraulic pump return plate processing equipment according to claim 1, characterized in that: The lifting drive assembly (31) comprises: A double-thread drive module includes two parallel lead screws and a lifting motor for driving each lead screw; The guide slide rail is arranged above the lifting platform (32) and cooperates with the lifting platform (32) to realize slidable support for the power mechanism; threaded sleeves cooperating with the lead screw are arranged at both ends of the lifting platform (32) and are driven up and down by the lifting motor.

8. The hydraulic pump return plate processing equipment according to claim 1, characterized in that: The power assembly (41) comprises a waterproof motor and a spline coupling, wherein the output end of the spline coupling extends into the transmission case and is connected to the driving gear.

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