An assembly device, apparatus and method for a spring in a variable displacement pump

Abstract

This application discloses an assembly device, equipment, and method for springs in a variable displacement pump. The assembly device includes an X-axis motion assembly, a product positioning assembly, a lever assembly, and a spring assembly assembly. The spring assembly assembly includes a second Z-axis motion assembly, a motion table, a third Z-axis motion assembly, a spring compression assembly, and a top block. In this application, the lever pushes a swing ring to rotate around a rotating pin within the pump body, thereby increasing the length of the spring mounting slot to meet installation requirements. This application can significantly improve the assembly success rate, while eliminating the need for strict control of the spring compression. The assembly equipment of this application is designed with a force measuring assembly and a spring attitude conversion assembly, facilitating force measurement and attitude conversion of the spring. The assembly method of this application first pre-compresses the spring and then sends it into the spring mounting slot, then pulls the pressing finger of the pre-compressed spring out of the spring mounting slot. The top block keeps the spring horizontal, and the spring's recovery deformation process takes place within the spring mounting slot, which can improve the assembly success rate.

Description

Technical Field

[0001] This application relates to assembly equipment, and more particularly to an assembly device, apparatus, and method for springs in a variable pump. Background Technology

[0002] A variable displacement pump (such as a variable displacement oil pump) is a common pump structure. A variable displacement pump includes a pump body, a swing ring, a rotating pin, and a variable spring. The swing ring is located inside the pump body, and the rotating pin is located between the pump body and the swing ring to enable the swing ring to swing within the pump cavity of the pump body. The swing ring is provided with a spring mounting surface, and a spring mounting groove for mounting the variable spring is formed between the spring mounting surface and the inner peripheral wall of the pump cavity.

[0003] Chinese patent CN106272257A discloses a quick spring installation fixture for an oil pump. In this patented solution, the spring is first compressed to a predetermined length in the receiving groove of the base, and then the compressed spring is pushed downward into the spring installation groove of the pump body by a vertical pressure head.

[0004] The problems with this solution are as follows: 1. During the process of pushing the compressed spring downwards into the spring mounting slot, the spring may interfere with the horizontal surface of the spring mounting slot or the horizontal surface inside the receiving slot due to the spring's deformation recovery, leading to spring assembly failure; 2. Before spring assembly, the pump body, swing ring, and rotating pin have already been assembled, but the length of the spring mounting slot is uncertain before spring assembly. The length of the spring mounting slot may be smaller than the length of the compressed spring, and the installation method of the aforementioned patent cannot be applied to working conditions where the length of the spring mounting slot is uncertain; 3. This patent requires extremely strict control of the spring compression. If the compression is too small, it cannot be pushed into the spring mounting slot; if the compression is too large, the pressure block used to compress the spring will interfere with the vertical pressure head because it cannot be withdrawn in time. Summary of the Invention

[0005] This application provides an assembly device, equipment, and method for springs in variable pumps, which solves the problem of difficult spring assembly.

[0006] In a first aspect, this application provides an assembly device for a spring in a variable pump, including an X-axis motion assembly, a product positioning assembly, a lever assembly, and a spring assembly assembly; the product positioning assembly is disposed on one side of the X-axis motion assembly along the Y-axis direction for positioning the pump body of the variable pump; the lever assembly includes a first Z-axis motion assembly and a lever, the first Z-axis motion assembly being connected to the X-axis motion assembly, and the lever being connected to the first Z-axis motion assembly for rotating the swing ring of the variable pump; the spring assembly assembly includes a second Z-axis motion assembly, a motion table, a third Z-axis motion assembly, a spring compression assembly, and a top block; the motion table is connected to the X-axis motion assembly via the second Z-axis motion assembly, and the spring compression assembly is connected to the motion table via the third Z-axis motion assembly; the spring compression assembly is provided with two pressing fingers for compressing the spring, and the top block is disposed on the motion table, along the X-axis direction, with the top block located between the two pressing fingers.

[0007] Preferably, the product positioning assembly includes a first Y-axis motion assembly, a first upright, a product positioning back plate, a fourth Z-axis motion assembly, product positioning pins, and a rotary clamping mechanism. The first Y-axis motion assembly is located below the X-axis motion assembly. One end of the first upright is located on the first Y-axis motion assembly. The product positioning back plate is located at the other end of the first upright via the fourth Z-axis motion assembly. Multiple product positioning pins are located on the product positioning back plate. The pump body is provided with pump body positioning holes that correspond one-to-one with the product positioning pins. One end of the rotary clamping mechanism is connected to the product positioning back plate and is used to press the pump body against the product positioning back plate.

[0008] Preferably, the spring compression assembly includes a drive body and two pressing fingers. The fixed end of the drive body is connected to the third Z-axis motion assembly. The two pressing fingers are spaced apart at the drive end of the drive body along the X-axis direction. The drive body is used to drive the two pressing fingers to move closer and further apart in the X-axis direction. A spring limiting space is formed between the inner side of the two pressing fingers in the X-axis direction and the lower surface of the top block.

[0009] Preferably, the spring assembly further includes a floating pressure plate assembly disposed on the motion table. Along the Y-axis, the floating pressure plate assembly is located on one side of the spring compression assembly and is used to press the swing ring into the pump body during the spring assembly process.

[0010] Preferably, the floating pressure plate assembly includes a guide rod, a pressure plate, and an elastic element. The guide rod slides along the Z-axis direction through the motion table, the pressure plate is connected to the guide rod and is used to press the swing ring, and the two ends of the elastic element are respectively connected to the motion table and the pressure plate. The extension and retraction direction of the elastic element is configured in the Z-axis direction.

[0011] Preferably, it further includes a fifth Z-axis motion component and a first displacement measuring component. The fifth Z-axis motion component is disposed on the X-axis motion component, and the first displacement measuring component is disposed on the fifth Z-axis motion component. The measuring direction of the first displacement measuring component is configured to be the Z-axis direction. The first displacement measuring component is used to detect the horizontal state of the spring after installation.

[0012] Secondly, this application provides an assembly device for springs in a variable pump, including a base plate, a spring feeding assembly, a receiving assembly, a force measuring assembly, a spring attitude conversion assembly, a spring placement platform, a spring transfer assembly, and an assembly device; the base plate is provided with feeding positions and force measuring positions spaced apart along the Y-axis direction; the spring feeding assembly is disposed on the base plate and is used to convey the springs to be assembled to the feeding positions; the receiving assembly includes a receiving platform and a second Y-axis motion assembly, the receiving platform is slidably disposed on the base plate along the Y-axis direction, a first spring placement position is disposed on the receiving platform, and the second Y-axis motion assembly is connected to the receiving platform and is used to drive the receiving platform to move in the Y-axis direction; the force measuring assembly includes a linear guide post, a sliding plate, a servo press, a pressure sensor, and a second displacement measuring assembly, the linear guide post is disposed on the base plate, the sliding plate is slidably disposed on the linear guide post, and the servo press... Connected to the sliding plate, it drives the sliding plate to move in the Z-axis direction. A pressure sensor is set on the sliding plate and corresponds to the first spring placement position of the receiving platform in the Z-axis direction. A second displacement measuring component is set on the sliding plate to measure the amount of movement of the sliding plate in the Z-axis direction. A spring attitude conversion component is set on one side of the loading position along the Y-axis direction to convert the spring from a vertical state to a horizontal state. A spring placement platform is set on one side of the loading position along the X-axis direction, and the spring placement platform is provided with a second spring placement position. The spring transfer component includes a sixth Z-axis motion component and a third cylinder finger for gripping the spring. The spring is transferred to the second spring placement position or the defective material box through the cooperation of the X-axis motion component and the sixth Z-axis motion component. In the X-axis direction, the spring compression component of the assembly device is set on one side of the second spring placement position.

[0013] Preferably, the spring feeding assembly includes a second upright, a feeding pipe, and a telescopic mechanism; the second upright is arranged on one side of the feeding position along the X-axis direction, the feeding pipe is arranged vertically and connected to the second upright through the telescopic mechanism, the telescopic direction of the telescopic mechanism is configured in the X-axis direction, the telescopic mechanism is used to drive the feeding pipe to move to the feeding position, and the feeding pipe is connected to the external spring conveying equipment.

[0014] Preferably, the spring posture conversion assembly includes a seventh Z-axis motion assembly, a rotation assembly, and a second cylinder finger for gripping the spring. The seventh Z-axis motion assembly is disposed on the base plate and located on one side of the loading position along the Y-axis direction. The rotation assembly is disposed on the seventh Z-axis motion assembly and is used to drive the second cylinder finger and the spring to rotate around the Y-axis direction, so that the spring rotates from a vertical state to a horizontal state.

[0015] Thirdly, this application provides a method for assembling a spring in a variable pump, using assembly equipment, and the assembly method includes: The receiving platform moves along the Y-axis until the first spring placement position of the receiving platform corresponds to the loading position; The spring feeding assembly moves to the feeding position, and then transports the spring to be assembled to the first spring placement position along the Z-axis direction. Then the spring feeding assembly resets. The receiving platform moves along the Y-axis until the first spring placement position of the receiving platform corresponds to the force measuring position; The sliding plate moves downward along the Z-axis. The pressure sensor compresses the spring placed vertically on the first spring position and records the force value. At the same time, the second displacement measuring component measures the displacement of the sliding plate. Once the displacement reaches the target, the sliding plate stops moving. The spring is judged to be qualified based on the force value and the displacement. The receiving platform moves along the Y-axis until the spring that has completed the force measurement is in the loading position; If the spring force measurement fails, the spring transfer assembly will transfer the failed spring to the unqualified material box. If the spring force measurement passes, the spring attitude conversion assembly will clamp the spring and change the spring from a vertical state to a horizontal state. The spring transfer assembly transfers the spring that has passed the force test from the second cylinder finger to the second spring placement position; The spring compression assembly moves to the second spring placement position, the lower surface of the top block abuts against the outer circumferential surface of the spring, and the pressing fingers of the spring compression assembly clamp the two ends of the spring and compress the spring to a predetermined length. The pump body is positioned on the product positioning assembly; Driven by the X-axis motion assembly, the lever of the lever assembly rotates the swing ring to increase the length of the spring mounting slot; The spring compression assembly, the spring, and the top block are inserted into the spring mounting slot under the drive of the X-axis motion assembly and the second Z-axis motion assembly. After the insertion amount reaches the set value, the third Z-axis motion assembly drives the two pressing fingers of the spring compression assembly to move upward, so that the two pressing fingers are pulled out from the spring mounting slot. After being pulled out, the spring returns to its length, and the assembly is completed.

[0016] The assembly apparatus, equipment, and method of this application have at least the following beneficial effects: Before assembling the spring, the assembly device of this application has the X-axis motion assembly driving the lever assembly to move above the pump body and the swing ring. Then, the first Z-axis motion assembly drives the lever downward along the Z-axis direction to insert it into the spring mounting groove between the pump body and the swing ring. Next, the X-axis motion assembly drives the lever assembly to move along the X-axis direction, and the lever pushes the swing ring to rotate around the rotating pin in the pump body, so that the length of the spring mounting groove is increased to meet the installation requirements. This solves the problem of uncertain material length of the spring mounting groove, greatly improves the spring assembly success rate, and also reduces the design difficulty of the pump body and swing ring assembly line in the previous process. After the swing ring is turned, the X-axis motion assembly and the second Z-axis motion assembly drive the spring compression assembly to clamp the spring to be assembled. The top block is located between the two pressing fingers of the spring compression assembly, and the lower surface of the top block is used to ensure that the spring is in a horizontal state, so that the posture of the spring is not affected during the assembly process. In this invention, during spring assembly, the second Z-axis motion component drives the pressing fingers, the top block, and the spring together to extend downwards into the spring mounting slot. Then, the third Z-axis motion component drives the two pressing fingers upwards relative to the top block. Finally, the two pressing fingers are pulled out of the spring mounting slot, and the length of the spring is restored in the spring mounting slot, thus completing the assembly. During this process, the lower surface of the top block remains in contact with the spring, restricting the spring to a horizontal position. This installation method, which involves pre-compressing the spring before sending it into the spring mounting slot and then pulling the pressing fingers out of the spring mounting slot, avoids the problem of the spring length changing before it is fully transferred into the spring mounting slot, thus preventing assembly failure. Compared with the prior art, this application can significantly improve the assembly success rate. At the same time, it does not require strict control of the spring compression amount; it is only necessary to ensure that the compression amount is less than the length of the spring mounting slot, reducing the design difficulty of equipment and control. Attached Figure Description

[0017] Various other advantages and benefits will become apparent to those skilled in the art upon reading the following detailed description of preferred embodiments. The accompanying drawings are for illustrative purposes only and are not intended to limit the scope of this application. Furthermore, the same reference numerals denote the same parts throughout the drawings. In the drawings: Figure 1 This is an isometric view of a variable displacement pump; Figure 2 This is a top view of a variable displacement pump; Figure 3 This is the first isometric view of the assembly device according to Embodiment 1 of this application (showing a partial enlarged view); Figure 4 This is an isometric view of the product positioning component according to Embodiment 1 of this application; Figure 5 This is an exploded view of the product positioning backplate and pump body in Embodiment 1 of this application; Figure 6This is the second isometric view of the assembly device according to Embodiment 1 of this application (showing a partial enlarged view); Figure 7 This is an isometric view of the spring assembly in Embodiment 1 of this application (the floating pressure plate assembly is hidden). Figure 8 yes Figure 7 Enlarged view of point A in the middle; Figure 9 This is a vertical cross-sectional view of the spring assembly according to Embodiment 1 of this application; Figure 10 This is an isometric drawing of the assembly equipment according to Embodiment 2 of this application; Figure 11 This is a top-view cross-sectional view of the base plate and receiving assembly in Embodiment 2; Figure 12 In Example 2, the assembly equipment conceals the isometric view behind the assembly device. Figure 1 ; Figure 13 In Example 2, the assembly equipment conceals the isometric view behind the assembly device. Figure 2 (A close-up view is shown). Figure 14 This is a partial schematic diagram of the assembly equipment in Embodiment 2; Figure 15 This is a flowchart of the assembly method in Embodiment 3 of this application.

[0018] The attached figures are labeled as follows: 100. X-axis motion assembly; 101. X-axis guide rail; 102. X-axis slide table; 200. Product positioning assembly; 201. First Y-axis motion assembly; 202. First upright; 203. Product positioning back plate; 204. Fourth Z-axis motion assembly; 205. Product positioning pin; 206. Rotary clamping mechanism; 207. Rotary telescopic cylinder; 208. Rotating block; 209. Clamping pin; 300. Lever assembly; 301. First Z-axis motion assembly; 302. Lever; 303. First horizontal plate; 400. Second Z-axis motion assembly; 500, sports table; 600. Third Z-axis motion assembly; 700. Spring compression assembly; 701. Drive body; 702. Pressing finger; 800, top block; 801, lower surface of the top block; 900. Floating pressure plate assembly; 901. Guide rod; 902. Pressure plate; 903. Elastic element; 1000, Fifth Z-axis motion assembly; 1001, Second horizontal plate; 1100. First displacement measurement component; 1200, base plate; 1201, loading position; 1202, force measuring position; 1300. Spring feeding assembly; 1301. Second upright; 1302. Feeding pipe; 1303. Telescopic mechanism; 1400, receiving assembly; 1401, receiving platform; 1402, second Y-axis motion assembly; 1403, first spring placement position; 1404, first cylinder finger; 1500 Force measuring component; 1501 Linear guide post; 1502 Sliding plate; 1503 Servo press; 1504 Pressure sensor; 1505 Second displacement measuring component; 1600, Spring attitude conversion assembly; 1601, Seventh Z-axis motion assembly; 1602, Rotation assembly; 1603, Second cylinder finger; 1700, Spring placement platform; 1701, Second spring placement position; 1800, Spring Transfer Assembly; 1801, Sixth Z-axis Motion Assembly; 1802, Third Cylinder Finger; 1803, Third Horizontal Plate; 1900, Non-conforming material box; 1. Pump body; 2. Swing ring; 3. Rotary pin; 4. Spring; 5. Spring mounting groove; 6. Pump body positioning hole. Detailed Implementation

[0019] The features and exemplary embodiments of various aspects of this application will be described in detail below. To make the objectives, technical solutions, and advantages of this application clearer, the application will be further described in detail below with reference to the accompanying drawings and specific embodiments. It should be understood that the specific embodiments described herein are only intended to explain this application and not to limit it. For those skilled in the art, this application can be implemented without some of these specific details. The following description of the embodiments is merely to provide a better understanding of this application by illustrating examples.

[0020] Example 1: This embodiment discloses an assembly device for a spring in a variable pump. To facilitate understanding of the technical solution of this embodiment, the variable pump in this embodiment will be briefly introduced first.

[0021] like Figure 1 and Figure 2As shown, the variable pump includes a pump body 1, a swing ring 2, a rotating pin 3, and a spring 4. The pump body 1 is provided with a pump cavity and multiple pump body positioning holes 6 for easy positioning. The swing ring 2 is disposed in the pump cavity. The rotating pin 3 rotatably connects the swing ring 2 and the pump body 1. When the swing ring 2 rotates around the rotating pin 3, the volume in the pump cavity changes, thereby realizing the pumping function. A spring mounting groove 5 for mounting the spring is formed between the inner peripheral wall of the pump body 1 and the spring mounting surface on the swing ring 2. This is prior art and will not be described in detail here.

[0022] In this embodiment, the assembly device is used to assemble the spring into the spring mounting groove 5. The pump body 1, the swing ring 2, and the rotating pin 3 are assembled before the spring 4 is assembled.

[0023] like Figure 3 As shown, in order to facilitate the description of the technical solution of this embodiment, the following direction is defined first: the X-axis direction and the Y-axis direction are two directions that intersect perpendicularly in the horizontal plane. The X-axis direction, the Y-axis direction and the Z-axis direction intersect perpendicularly in pairs, forming a three-dimensional rectangular coordinate system in space.

[0024] like Figure 3 As shown, the assembly device in this embodiment includes an X-axis motion assembly 100, a product positioning assembly 200, a lever assembly 300, and a spring assembly.

[0025] like Figure 3 As shown, the X-axis motion assembly 100 includes an X-axis guide rail 101 and an X-axis slide 102. The length direction of the X-axis guide rail 101 is configured in the X-axis direction. The X-axis slide 102 is slidably disposed on the X-axis guide rail 101 along the X-axis direction. The X-axis guide rail 101 can drive the X-axis slide 102 to slide in the X-axis direction.

[0026] like Figure 4 and Figure 5 As shown, the product positioning assembly 200 includes a first Y-axis motion assembly 201, a first stand 202, a product positioning back plate 203, a fourth Z-axis motion assembly 204, a product positioning pin 205, and a rotary clamping mechanism 206.

[0027] like Figure 4 As shown, the first Y-axis motion component 201 is disposed below the X-axis slide 102, and the lower end of the first upright 202 is disposed on the first Y-axis motion component 201. The first Y-axis motion component 201 can drive the first upright 202 to move in the Y-axis direction.

[0028] like Figure 4 As shown, a fourth Z-axis motion component 204 is provided at the upper end of the first upright 202, and the product positioning back plate 203 is provided at the moving end of the fourth Z-axis motion component 204. The fourth Z-axis motion component 204 can drive the product positioning back plate 203 to move in the Z-axis direction.

[0029] like Figure 5 As shown, there are multiple product positioning pins 205, and the axial direction of the product positioning pins 205 is in the Y-axis direction. The product positioning pins 205 can be inserted into the pump body positioning holes 6 of the pump body 1 one by one to achieve positioning of the pump body 1.

[0030] like Figure 5 As shown, a rotary clamping mechanism 206 is mounted on the product positioning back plate 203 and is used to clamp the pump body 1 onto the product positioning back plate 203 in the Y-axis direction. Preferably, the rotary clamping mechanism 206 includes a rotary telescopic cylinder 207, a rotating block 208, and a clamping pin 209. The fixed end of the rotary telescopic cylinder 207 is mounted on the product positioning back plate 203, one end of the rotating block 208 is mounted on the output end of the rotary telescopic cylinder 207, and the clamping pin 209 is mounted on the other end of the rotating block 208. When it is necessary to clamp the pump body 1, the rotary telescopic cylinder 207 first drives the rotating block 208 to rotate around the Y-axis, so that the clamping pin 209 corresponds to the positioning machining surface on the pump body 1. Then, the rotary telescopic cylinder 207 drives the clamping pin 209 to press against the positioning machining surface of the pump body 1 along the Y-axis, thereby achieving complete positioning of the pump body 1.

[0031] In this embodiment, the product positioning component 200 is provided with degrees of freedom in the Y-axis and Z-axis directions, which can facilitate movement to the loading and unloading position of the pump body 1 and to drive the positioned pump body 1 to the positioning accuracy detection position. In this embodiment, it is preferred that after the pump body 1 and the swing ring 2 are assembled, they are transferred to the product positioning component 200 by a robot or other equipment.

[0032] like Figure 6 As shown, the lever assembly 300 includes a first Z-axis motion assembly 301 and a lever 302. The first Z-axis motion assembly 301 is connected to the X-axis slide 102 via a first horizontal plate 303. The upper end of the lever 302 is connected to the output end of the first Z-axis motion assembly 301. The lower end of the lever 302 can be inserted downward into the spring mounting groove 5 under the drive of the first Z-axis motion assembly 301. Then, the X-axis motion assembly 100 drives the lever 302 to move in the X-axis direction, so that the lower end of the lever 302 can move the swing ring 2 to rotate around the rotating pin 3, thereby increasing the length of the spring mounting groove 5.

[0033] like Figure 7 and Figure 8 As shown, the spring assembly includes a second Z-axis motion component 400, a motion table 500, a third Z-axis motion component 600, a spring compression component 700, and a top block 800.

[0034] like Figure 7As shown, the second Z-axis motion component 400 is mounted on the X-axis slide 102 and is used to drive the motion table 500 to move in the Z-axis direction.

[0035] like Figure 7 As shown, the motion table 500 provides mounting and connection positions for the spring compression assembly 700 and the top block 800.

[0036] like Figure 8 and Figure 9 As shown, the third Z-axis motion assembly 600 is disposed on the motion table 500 and is used to drive the spring compression assembly 700 to move in the Z-axis direction. Both the second Z-axis motion assembly 400 and the third Z-axis motion assembly 600 can drive the spring compression assembly 700 to move in the Z-axis direction. The second Z-axis motion assembly 400 is used to drive the motion table 500, the spring compression assembly 700 and the top block 800 to move in the Z-axis direction, while the third Z-axis motion assembly 600 is used to drive the spring compression assembly 700 to move in the Z-axis direction, specifically moving upward along the Z-axis direction. This causes the pressing finger 702 of the spring compression assembly 700 to be relatively misaligned with the top block 800 in the Z-axis direction, thereby achieving the upward extraction of the pressing finger 702 of the spring compression assembly 700 from the spring mounting groove 5 without changing the positions of the top block 800 and the spring 4 to be assembled.

[0037] like Figure 8 As shown, the spring compression assembly 700 includes a drive body 701 and two pressing fingers 702. The fixed end of the drive body 701 is connected to the third Z-axis motion assembly 600, enabling the third Z-axis motion assembly 600 to directly or indirectly drive the drive body 701 to move in the Z-axis direction. One end of each of the two pressing fingers 702 is connected to the drive end of the drive body 701. The two pressing fingers 702 are arranged parallel in the X-axis direction. Under the drive of the drive body 701, the two pressing fingers 702 can move closer and further away from each other in the X-axis direction. The opposing surfaces (i.e., the inner surfaces) of the two pressing fingers 702 are vertical surfaces perpendicular to the X-axis direction. Through the opposing surfaces of the two pressing fingers 702, force is applied to both ends of the spring 4 from both ends in the X-axis direction, thereby compressing the spring 4 along its axial direction to a predetermined length. This predetermined length is generally two-fifths to four-fifths of the length L of the spring mounting groove 5. Here, the length of the spring mounting groove 5 refers to the length of the spring mounting groove 5 after the swing ring 2 is moved by the lever 302.

[0038] like Figure 8As shown, the upper end of the top block 800 is fixedly mounted on the lower surface of the motion table 500. The top block 800 extends downward along the Z-axis, and the length of the lower end of the top block 800 in the X-axis direction is no greater than the length of the compressed spring, so as to avoid the lower end of the top block 800 from hindering the two pressing fingers 702 from compressing the spring to the predetermined length. Along the X-axis direction, the lower end of the top block 800 is located between the two pressing fingers 702, and the three are aligned in the X-axis direction. In this embodiment, the lower surface 801 of the top block is configured as a horizontal machined surface parallel to the X-axis direction. This horizontal machined surface and the opposing surfaces of the two pressing fingers 702 form a spring limiting space. The opposing surfaces of the two pressing fingers 702 restrict the displacement of the spring in the X-axis direction, while the lower surface 801 of the top block contacts the outer circumferential surface of the spring 4, restricting the spring to a horizontal state. This ensures that the spring does not exhibit abnormal states such as tilting up or down when it is gripped by the pressing fingers 702 or assembled in the spring mounting groove 5, thus ensuring assembly quality and success rate. Compared to existing technologies, this embodiment does not use the top block 800 to push the spring into the spring mounting groove 5. Instead, the spring is first pre-compressed and then sent into the spring mounting groove 5. The pressing finger 702 of the pre-compressed spring is then pulled out of the spring mounting groove 5. The spring recovers its length within the spring mounting groove 5, thus completing the assembly. The top block 800 plays a role in keeping the spring horizontal during the spring assembly process, and the entire process of the spring recovering its deformation takes place within the spring mounting groove 5, which can significantly improve the assembly success rate.

[0039] In this embodiment, the preferred embodiment is as follows: Figure 9 As shown, the spring assembly also includes a floating pressure plate assembly 900. The floating pressure plate assembly 900 is disposed on the motion table 500 and along the Y-axis direction. The floating pressure plate assembly 900 is located on the side of the top block 800 close to the pump body 1. During the process of the top block 800, the spring compression assembly 700 and the spring 4 being driven downward into the spring mounting groove 5 by the second Z-axis motion assembly 400, the floating pressure plate assembly 900 first contacts the upper surface of the swing ring 2 in the pump body 1, and then presses the swing ring 2 into the pump cavity of the pump body 1. This prevents the swing ring 2 from deflecting or moving during the assembly process, which would affect the assembly of the spring. At the same time, it prevents the swing ring 2 from suddenly deflecting significantly when the spring returns to its length in the spring mounting groove 5.

[0040] In this embodiment, the preferred embodiment is as follows: Figure 9As shown, the floating pressure plate assembly 900 includes guide rods 901, pressure plates 902, and elastic elements 903. There are at least two guide rods 901, and all guide rods 901 slide along the Z-axis direction through the motion table 500, and can slide up and down relative to the motion table 500 in the Z-axis direction. The pressure plate 902 is fixedly connected to the lower end of all guide rods 901, and the lower surface of the pressure plate 902 is used to contact the upper surface of the swing ring 2. The elastic elements 903 are coaxially sleeved on the outer circumference of the guide rods 901, and the upper end of the elastic element 903 abuts against the lower surface of the motion table 500, and the lower end of the elastic element 903 abuts against the upper surface of the pressure plate 902. The extension and retraction direction of the elastic element 903 is configured in the Z-axis direction. The elastic element 903 is used to provide a downward elastic pressing force for the pressure plate 902 to press the swing ring 2. In this embodiment, the elastic element 903 is preferably a telescopic spring.

[0041] In this embodiment, the preferred option is described again; please refer to the previous section. Figure 6 The assembly device also includes a fifth Z-axis motion component 1000 and a first displacement measuring component 1100. The fifth Z-axis motion component 1000 is connected to the X-axis slide 102 via a second horizontal plate 1001. The fifth Z-axis motion component 1000 is used to drive the first displacement measuring component 1100 to move in the Z-axis direction. The X-axis slide 102 can drive the first displacement measuring component 1100 to move along the X-axis direction to directly above the spring mounting groove 5. The measuring end of the first displacement measuring component 1100 can extend into the spring mounting groove 5 and contact the outer peripheral surface of the spring 4 under the drive of the fifth Z-axis motion component 1000. If the spring is tilted up and down, the value measured by the first displacement measuring component 1100 will have a large difference from the standard value. The quality of the spring after assembly is judged in this way.

[0042] The working principle of the assembly device in this embodiment is as follows: the X-axis motion assembly 100 drives the motion table 500 and the spring compression assembly 700 disposed on the motion table 500 to move directly above the spring 4 to be assembled; the second Z-axis motion assembly 400 drives the spring compression assembly 700 downward until the two pressing fingers 702 of the spring compression assembly 700 are respectively located on both sides of the axial direction of the spring 4 to be assembled; the spring compression assembly 700 clamps the spring and retracts it to a predetermined length; then, the lever 302 is driven into the spring mounting groove 5, in Driven by the X-axis motion assembly 100, the lever 302 moves the swing ring 2 to increase the length of the spring mounting groove 5. Then, the lever 302 exits the spring mounting groove 5, and the spring compression assembly 700 is driven into the spring mounting groove 5. Before this, the pressure plate 902 presses the swing ring 2 into the pump body 1. Then, the third Z-axis motion assembly 600 drives the two pressing fingers 702 of the spring compression assembly 700 to move upward, so that the two pressing fingers 702 are pulled out from the spring mounting groove 5. After being pulled out, the spring returns to its length, and the assembly is completed.

[0043] Example 2: like Figure 10 As shown, this embodiment 2 discloses an assembly device for springs in a variable pump. The assembly device includes a base plate 1200, a spring feeding assembly 1300, a receiving assembly 1400, a force measuring assembly 1500, a spring attitude conversion assembly 1600, a spring placement platform 1700, a spring transfer assembly 1800, and the assembly device in embodiment 1.

[0044] like Figure 11 As shown, the base plate 1200 is fixedly mounted on the external structure. The upper surface of the base plate 1200 is configured as a horizontal plane to provide a position for the installation of other structures. The base plate 1200 has two stations spaced apart in the Y-axis direction: a loading station 1201 and a force measuring station 1202. The spring loading assembly 1300 transports the springs 4 to be assembled to the loading station 1201. The force measuring station 1202 is used to install the force measuring assembly 1500 to measure the force of the springs.

[0045] like Figure 12 As shown, the spring feeding assembly 1300 includes a second upright 1301, a feeding pipe 1302, and a telescopic mechanism 1303. Along the X-axis, the second upright 1301 is located on one side of the feeding position 1201, and its lower end is fixedly mounted on the base plate 1200. The feeding pipe 1302 is vertically arranged and connected to an external spring conveying device. In this embodiment, the spring conveying device preferably includes a spring vibratory feeder and an air-blowing device. Specifically, the spring vibratory feeder disperses the spring material, and after cutting, the air-blowing conveying pipe of the air-blowing device completes the spring discharge. The fixed end of the telescopic mechanism 1303 is located on the second upright 1301, and the telescopic end of the telescopic mechanism 1303 is connected to the feeding pipe 1302. The telescopic direction of the telescopic mechanism 1303 is configured in the X-axis direction. The telescopic mechanism 1303 can drive the feeding pipe 1302 to move directly above the loading position 1201. An external spring conveying device receives the feeding signal and conveys the spring to the feeding pipe 1302. The spring falls out from the lower opening of the feeding pipe 1302. After a single spring is discharged, the telescopic mechanism 1303 drives the feeding pipe 1302 away from the loading position 1201. In this embodiment, the telescopic mechanism 1303 is configured as a telescopic cylinder, electric push rod, or other linear drive components.

[0046] like Figure 11As shown, the receiving assembly 1400 includes a receiving platform 1401 and a second Y-axis motion assembly 1402; the receiving platform 1401 is slidably disposed on the base plate 1200, and the sliding direction is configured in the Y-axis direction. A first spring placement position 1403 is provided on the receiving platform 1401 for placing a spring in a vertical state. In this embodiment, the preferred receiving assembly 1400 further includes a first cylinder finger 1404, which is disposed on the receiving platform 1401. Both fingers of the first cylinder finger 1404 are provided with V-shaped grooves, and the two V-shaped grooves together form a rectangular space for limiting the spring. The spring is located in the rectangular space, which can prevent the spring from shifting when compressing and measuring force. The second Y-axis motion assembly 1402 is connected to the receiving platform 1401 and is used to drive the receiving platform 1401 to move in the Y-axis direction. Specifically, it drives the first spring placement position 1403 on the receiving platform 1401 to move to the loading position 1201 and from the loading position 1201 to the force measuring position 1202.

[0047] like Figure 13As shown, the force measuring assembly 1500 includes linear guide posts 1501, sliding plates 1502, servo presses 1503, pressure sensors 1504, and a second displacement measuring assembly 1505. The lower ends of the two linear guide posts 1501 are fixedly mounted on the base plate 1200. The two linear guide posts 1501 are arranged along the X-axis on both sides of the receiving platform 1401. The two ends of the sliding plates 1502 are slidably mounted on the outer periphery of the linear guide posts 1501, with the sliding direction configured in the Z-axis direction. The servo press 1503 is connected to the upper end of the linear guide posts 1501. The output end of the servo press 1503 is connected to the sliding plate 1502 to drive the sliding plate 1502 to move in the Z-axis direction. The pressure sensor 1504 is set on the lower side of the sliding plate 1502 and is indirectly connected to the sliding plate 1502. The pressure sensor 1504 is coaxially set with the force measuring position 1202. The second displacement measuring component 1505 is set on the sliding plate 1502. The measuring end of the second displacement measuring component 1505 can abut against the receiving platform 1401 or the base plate 1200 to measure the displacement of the sliding plate 1502. The force measurement principle of this embodiment is as follows: After the receiving platform 1401 moves to the loading position 1201 to receive a spring, it moves to the force measuring position 1202. At this time, the spring is directly below the pressure sensor 1504. The sliding plate 1502 is driven downward by the servo press 1503. The pressure sensor 1504 abuts against the spring placed vertically on the receiving platform 1401 and compresses the spring. The pressure sensor 1504 measures the force value. At the same time, the second displacement measuring component 1505 measures the displacement of the sliding plate 1502. After the displacement reaches the standard, the sliding plate 1502 and the pressure sensor 1504 stop moving downward. The pressure sensor 1504 resets upward. The receiving platform 1401 drives the spring to move back to the loading position 1201, waiting for subsequent work. The spring is judged to be qualified by the displacement and the force data measured by the pressure sensor 1504.

[0048] like Figure 12 As shown, the spring posture conversion assembly 1600 is used to convert a vertical spring to a horizontal state, facilitating subsequent assembly. The spring posture conversion assembly 1600 includes a seventh Z-axis motion assembly 1601, a rotation assembly 1602, and a second cylinder finger 1603. The seventh Z-axis motion assembly 1601 is mounted on the base plate 1200 along the Y-axis direction. The force measuring assembly 1500, the loading position 1201, and the seventh Z-axis motion assembly 1601 of the spring posture conversion assembly 1600 are sequentially arranged. The seventh Z-axis motion assembly 1601 drives the rotation assembly 1602 and the second cylinder finger 1603 to move in the Z-axis direction. The rotation assembly 1602 is connected to the moving end of the seventh Z-axis motion assembly 1601 and drives the second cylinder finger 1603 and the spring to rotate around the Y-axis direction. The rotation assembly 1602 is configured as a rotary cylinder, and the second cylinder finger 1603 clamps the spring.

[0049] like Figure 12 As shown, the lower end of the spring placement platform 1700 is fixedly mounted on the base plate 1200, and the upper end of the spring placement platform 1700 is provided with a second spring placement position 1701, which is used to place a horizontally positioned spring. In the X-axis direction, the spring placement platform 1700, the loading position 1201, and the spring loading assembly 1300 are arranged sequentially.

[0050] like Figure 14 As shown, the spring transfer assembly 1800 includes a sixth Z-axis motion assembly 1801 and a third cylinder finger 1802. The sixth Z-axis motion assembly 1801 is mounted on the X-axis slide 102 via a third horizontal plate 1803. The sixth Z-axis motion assembly 1801 is used to drive the third cylinder finger 1802 to move in the Z-axis direction. The third cylinder finger 1802 is connected to the moving end of the sixth Z-axis motion assembly 1801 and is used to clamp the spring.

[0051] If the spring force measurement fails, the third cylinder finger 1802, in coordination with the X-axis motion assembly 100 and the sixth Z-axis motion assembly 1801, clamps the spring (the spring that has completed the force measurement test) at the loading position 1201 and transfers it to the unqualified material box 1900. If the spring force measurement passes, the second cylinder finger 1603 of the spring attitude conversion assembly 1600, in coordination with the seventh Z-axis motion assembly 1601 and the rotation assembly 1602, clamps the spring and changes it from a vertical state to a horizontal state. Then, the third cylinder finger 1802, in coordination with the X-axis motion assembly 100 and the sixth Z-axis motion assembly 1801, clamps the horizontal spring and places it in the second spring placement position 1701, waiting for subsequent assembly work.

[0052] The spring compression assembly 700 of the assembly device is located on one side of the second spring placement position 1701 in the X-axis direction, which facilitates the subsequent downward movement of the spring compression assembly 700 to the second spring placement position 1701 to clamp the qualified spring.

[0053] In this embodiment, the first Z-axis motion assembly 301 to the seventh Z-axis motion assembly 1601 are all preferably existing linear motion guide rails, telescopic cylinders, electric push rods and other linear drive mechanisms. Alternatively, existing telescopic components plus slide rails can be used for linear drive. The first Y-axis motion assembly 201 and the second Y-axis motion assembly 1402 are also preferably existing linear motion guide rails, telescopic cylinders, electric push rods and other linear drive mechanisms. The first displacement measuring assembly 1100 and the second displacement measuring assembly 1505 are both preferably displacement sensors of the NS-WY02 series.

[0054] Example 3: like Figure 15As shown, this embodiment discloses an assembly method for a spring in a variable pump. The assembly method uses the assembly equipment in Embodiment 2. Before assembling the spring, the pump body 1 and the swing ring 2 are assembled in a previous process, and then the pump body 1 is installed on the product positioning assembly 200. The assembly method of this embodiment includes the following steps: Step S1, receiving material at receiving station 1401 The receiving platform 1401 is driven by the second Y-axis motion assembly 1402 until the first spring placement position 1403 on the receiving platform 1401 is directly above the loading position 1201. Then, the feeding tube 1302 of the spring loading assembly 1300 moves to directly above the first spring placement position 1403. Then, a spring is delivered to the first spring placement position 1403 by air blowing. The first cylinder finger 1404 on the receiving platform 1401 restricts the position of the spring, the feeding tube 1302 resets, and the receiving platform 1401 drives the spring to the force measuring position 1202. Step S2, Spring force measurement The servo press 1503 drives the sliding plate 1502, pressure sensor 1504, and second displacement measuring component 1505 to move downwards. The pressure sensor 1504 abuts against and compresses the spring placed vertically on the receiving table 1401. The pressure sensor 1504 measures the force value. At the same time, the second displacement measuring component 1505 measures the displacement of the sliding plate 1502. After the displacement reaches the standard, the sliding plate 1502 and pressure sensor 1504 stop moving downwards. The pressure sensor 1504 resets upwards. The receiving table 1401 drives the spring to move back to the loading position 1201, waiting for subsequent work. The spring's qualification is determined by the displacement of the sliding plate 1502 and the force data measured by the pressure sensor 1504. The specific standard for judging the spring's qualification is set according to actual needs.

[0055] If the spring is not up to standard, proceed to step S3; if it is up to standard, proceed to step S4.

[0056] Step S3: Recycling of substandard springs The X-axis motion assembly 100 drives the third cylinder finger 1802 to move directly above the loading position 1201. The sixth Z-axis motion assembly 1801 drives the third cylinder finger 1802 to move downward along the Z-axis until the defective spring is within the clamping range of the third cylinder finger 1802. Then, the third cylinder finger 1802 clamps the defective spring. Next, the sixth Z-axis motion assembly 1801 drives the third cylinder finger 1802 and the defective spring to move upward to a predetermined height. The X-axis motion assembly 100 drives the third cylinder finger 1802 and the defective spring to move directly above the defective material box 1900 along the X-axis. The third cylinder finger 1802 releases the defective spring, and the defective spring falls into the defective material box 1900.

[0057] Step S4, Qualified spring transition state The seventh Z-axis motion assembly 1601 drives the rotating assembly 1602 and the second cylinder finger 1603 to move downwards until the qualified spring is within the clamping range of the second cylinder finger 1603. The second cylinder finger 1603 clamps the qualified spring, while the first cylinder finger 1404 releases the qualified spring. Then, the rotating assembly 1602 drives the second cylinder finger 1603 and the qualified spring to rotate 90 degrees around the Y-axis, so that the qualified spring changes from a vertical state to a horizontal state. Then, the seventh Z-axis motion assembly 1601 drives the horizontal spring to move upwards a predetermined distance so that the third cylinder finger 1802 of the subsequent spring transfer assembly 1800 can pick up the material.

[0058] Step S5: Transfer the qualified spring to the second spring placement position 1701 The X-axis motion assembly 100 drives the third cylinder finger 1802 to move above the qualified spring. The sixth Z-axis motion assembly 1801 drives the third cylinder finger 1802 downward until the qualified spring is within the clamping range of the third cylinder finger 1802. The third cylinder finger 1802 clamps the qualified spring, while the second cylinder finger 1603 releases the qualified spring. Then, the X-axis motion assembly 100 drives the third cylinder finger 1802 and the qualified spring to move a short distance along the X-axis so that the qualified spring is out of the clamping range of the second cylinder finger 1603. Then, through the cooperation of the sixth Z-axis motion assembly 1801 and the X-axis motion assembly 100, the qualified spring is placed downward in the second spring placement position 1701. Specifically, the qualified spring is first driven upward, then moves along the X-axis to directly above the second spring placement position 1701. Finally, the sixth Z-axis motion assembly 1801 drives the qualified spring downward in the second spring placement position 1701.

[0059] Step S6: Spring compression assembly 700 clamps the spring. The X-axis motion assembly 100 drives the motion table 500 and the spring compression assembly 700 and top block 800 disposed on the motion table 500 to move in the X-axis direction until the spring compression assembly 700 and top block 800 are located at the second spring placement position 1701 and directly above the spring. The two pressing fingers 702 of the spring compression assembly 700 open in the X-axis direction. Then, the second Z-axis motion assembly 400 drives the motion table 500 and the spring compression assembly 700 and top block 800 disposed on the motion table 500 to move downward until the two pressing fingers 702 are located on both sides of the spring axis. Then, the two pressing fingers 702 approach each other in the X-axis direction, clamp the spring and retract it to a predetermined length. Finally, the second Z-axis motion assembly 400 drives the spring compression assembly 700 and the spring to move upward.

[0060] Step S7: Move the swing ring 2 The X-axis motion assembly 100 drives the lever 302 to move directly above the spring mounting groove 5. Then, the first Z-axis motion assembly 301 drives the lower end of the lever 302 to insert downward into the spring mounting groove 5. Then, the X-axis motion assembly 100 drives the lever 302 to move in the X-axis direction, so that the lower end of the lever 302 can move the swing ring 2 to rotate around the rotating pin 3, thereby increasing the length of the spring mounting groove 5. After completion, the first Z-axis motion assembly 301 drives the lever 302 to return to its original position. Step S8: Assemble the spring into the spring mounting slot 5 The X-axis motion assembly 100 drives the spring compression assembly 700 and the spring to move along the X-axis direction to directly above the spring mounting groove 5. Then, the second Z-axis motion assembly 400 drives the motion table 500 and the floating pressure plate assembly 900, spring compression assembly 700, top block 800, and spring mounted on the motion table 500 to move towards the spring mounting groove 5. The pressure plate 902 of the floating pressure plate assembly 900 first contacts the upper surface of the swing ring 2 and, through the elastic force of the elastic element 903, elastically presses the swing ring 2 into the pump body 1. Then, driven by the second Z-axis motion assembly 400, the spring compression assembly 700, top block 800, and spring extend into the spring mounting groove 5, and the spring 4... After reaching the predetermined installation depth, the third Z-axis motion assembly 600 drives the two pressing fingers 702 of the spring compression assembly 700 to move upward. During this process, the motion table 500 and the top block 800 below the motion table 500 remain stationary, allowing the two pressing fingers 702 to be pulled out of the spring mounting groove 5. After being pulled out, the restriction in the length direction of the spring is removed, and the spring returns to its length. The two ends of the spring abut against the spring mounting surface of the swing ring 2 and the inner peripheral wall of the pump cavity, respectively. Then, the second Z-axis motion assembly 400 drives the motion table 500 and the floating pressure plate assembly 900, the spring compression assembly 700, and the top block 800 disposed on the motion table 500 to return to their original position upward as a whole.

[0061] In a preferred embodiment of the assembly method, the assembly method further includes step S9, which is used to detect the horizontal state of the spring, as follows: The X-axis motion assembly 100 drives the first displacement measuring assembly 1100 to move directly above the spring mounting slot 5, with the measuring end of the first displacement measuring assembly 1100 corresponding to the spring already installed in the spring mounting slot 5. Then, the fifth Z-axis motion assembly 1000 drives the first displacement measuring assembly 1100 to move downward a predetermined distance. Then, the horizontal state of the spring is determined based on the value measured by the first displacement measuring assembly 1100. If the horizontal state is not determined to be up to standard, the product is marked and corrected in subsequent processes.

[0062] It should be noted that, in this document, relational terms such as "first" and "second" are used merely to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising..." does not exclude the presence of additional identical elements in the process, method, article, or apparatus that includes the element.

Claims

1. An assembly device for a spring in a variable displacement pump, characterized in that, include: X-axis motion assembly (100); The product positioning component (200) is located on one side of the X-axis motion component (100) along the Y-axis direction and is used to position the pump body (1) of the variable pump. The lever assembly (300) includes a first Z-axis motion assembly (301) and a lever (302). The first Z-axis motion assembly (301) is connected to the X-axis motion assembly (100), and the lever (302) is connected to the first Z-axis motion assembly (301) for rotating the swing ring (2) of the variable pump. The spring assembly includes a second Z-axis motion component (400), a motion table (500), a third Z-axis motion component (600), a spring compression component (700), and a top block (800); the motion table (500) is connected to the X-axis motion component (100) via the second Z-axis motion component (400), the spring compression component (700) is connected to the motion table (500) via the third Z-axis motion component (600), the spring compression component (700) is provided with two pressing fingers (702) for compressing the spring (4), and the top block (800) is provided on the motion table (500) along the X-axis direction, the top block (800) is located between the two pressing fingers (702).

2. The assembly device according to claim 1, characterized in that, The product positioning assembly (200) includes a first Y-axis motion assembly (201), a first stand (202), a product positioning back plate (203), a fourth Z-axis motion assembly (204), product positioning pins (205), and a rotary clamping mechanism (206). The first Y-axis motion assembly (201) is located below the X-axis motion assembly (100). One end of the first stand (202) is located on the first Y-axis motion assembly (201). The product positioning back plate (203) is located on the other end of the first stand (202) through the fourth Z-axis motion assembly (204). Multiple product positioning pins (205) are located on the product positioning back plate (203). The pump body (1) is provided with pump body positioning holes (6) that correspond one-to-one with the product positioning pins (205). One end of the rotary clamping mechanism (206) is connected to the product positioning back plate (203) and is used to clamp the pump body (1) onto the product positioning back plate (203).

3. The assembly device according to claim 1, characterized in that, The spring compression assembly (700) includes a drive body (701) and two pressing fingers (702). The fixed end of the drive body (701) is connected to the third Z-axis motion assembly (600). The two pressing fingers (702) are spaced apart at the drive end of the drive body (701) along the X-axis direction. The drive body (701) is used to drive the two pressing fingers (702) to move closer and further apart in the X-axis direction. The two pressing fingers (702) form a spring limiting space between their inner surfaces in the X-axis direction and the lower surface (801) of the top block.

4. The assembly device according to claim 3, characterized in that, The spring assembly also includes a floating pressure plate assembly (900) disposed on the motion table (500). Along the Y-axis direction, the floating pressure plate assembly (900) is located on one side of the spring compression assembly (700) and is used to press the swing ring (2) into the pump body (1) during the assembly of the spring (4).

5. The assembly device according to claim 4, characterized in that, The floating pressure plate assembly (900) includes a guide rod (901), a pressure plate (902), and an elastic element (903). The guide rod (901) slides along the Z-axis direction through the motion table (500). The pressure plate (902) is connected to the guide rod (901) and is used to press the swing ring (2). The two ends of the elastic element (903) are respectively connected to the motion table (500) and the pressure plate (902). The extension and retraction direction of the elastic element (903) is configured in the Z-axis direction.

6. The assembly apparatus according to any one of claims 1 to 5, characterized in that, It also includes a fifth Z-axis motion component (1000) and a first displacement measuring component (1100). The fifth Z-axis motion component (1000) is disposed on the X-axis motion component (100), and the first displacement measuring component (1100) is disposed on the fifth Z-axis motion component (1000). The measuring direction of the first displacement measuring component (1100) is configured to be the Z-axis direction. The first displacement measuring component (1100) is used to detect the horizontal state of the spring (4) after installation.

7. An assembly device for a spring in a variable displacement pump, characterized in that, include: The base plate (1200) is provided with loading positions (1201) and force measuring positions (1202) at intervals along the Y-axis. A spring feeding assembly (1300) is set on the base plate (1200) and is used to feed the spring (4) to be assembled to the upper material position (1201). The receiving assembly (1400) includes a receiving platform (1401) and a second Y-axis motion assembly (1402). The receiving platform (1401) is slidably disposed on the base plate (1200) along the Y-axis direction. A first spring placement position (1403) is provided on the receiving platform (1401). The second Y-axis motion assembly (1402) is connected to the receiving platform (1401) and is used to drive the receiving platform (1401) to move in the Y-axis direction. The force measuring component (1500) includes a linear guide post (1501), a sliding plate (1502), a servo press (1503), a pressure sensor (1504), and a second displacement measuring component (1505). The linear guide post (1501) is disposed on the base plate (1200), the sliding plate (1502) is slidably disposed on the linear guide post (1501), the servo press (1503) is connected to the sliding plate (1502) and is used to drive the sliding plate (1502) to move in the Z-axis direction, the pressure sensor (1504) is disposed on the sliding plate (1502) and corresponds to the first spring placement position (1403) of the receiving platform (1401) in the Z-axis direction, and the second displacement measuring component (1505) is disposed on the sliding plate (1502) and is used to measure the amount of movement of the sliding plate (1502) in the Z-axis direction. The spring attitude conversion assembly (1600) is set on one side of the loading position (1201) along the Y-axis direction and is used to convert the spring (4) from a vertical state to a horizontal state. A spring placement table (1700) is set on one side of the loading position (1201) along the X-axis direction, and the spring placement table (1700) is provided with a second spring placement position (1701). The spring transfer assembly (1800) includes a sixth Z-axis motion assembly (1801) and a third cylinder finger (1802) for gripping the spring (4), which transfers the spring (4) to the second spring placement position (1701) or the non-conforming material box (1900) through the cooperation of the X-axis motion assembly (100) and the sixth Z-axis motion assembly (1801). It also includes the assembly device according to any one of claims 1 to 6, wherein, in the X-axis direction, the spring compression assembly (700) of the assembly device is disposed on one side of the second spring placement position (1701).

8. The assembly equipment according to claim 7, characterized in that, The spring feeding assembly (1300) includes a second upright (1301), a feeding pipe (1302), and a telescopic mechanism (1303). The second upright (1301) is arranged along the X-axis direction on one side of the feeding position (1201). The feeding pipe (1302) is arranged vertically and connected to the second upright (1301) through the telescopic mechanism (1303). The telescopic direction of the telescopic mechanism (1303) is configured to be the X-axis direction. The telescopic mechanism (1303) is used to drive the feeding pipe (1302) to move to the feeding position (1201). The feeding pipe (1302) is connected to the external spring conveying equipment.

9. The assembly equipment according to claim 7, characterized in that, The spring posture conversion assembly (1600) includes a seventh Z-axis motion assembly (1601), a rotation assembly (1602), and a second cylinder finger (1603) for gripping the spring (4). The seventh Z-axis motion assembly (1601) is located on the base plate (1200) and is located on one side of the loading position (1201) along the Y-axis direction. The rotation assembly (1602) is located on the seventh Z-axis motion assembly (1601) and is used to drive the second cylinder finger (1603) and the spring (4) to rotate around the Y-axis direction so that the spring (4) rotates from a vertical state to a horizontal state.

10. A method for assembling a spring in a variable displacement pump, characterized in that, Using the assembly equipment according to any one of claims 7 to 9, the assembly method includes: The receiving platform (1401) moves along the Y-axis until the first spring placement position (1403) of the receiving platform (1401) corresponds to the loading position (1201); The spring feeding assembly (1300) moves to the feeding position (1201), and then the spring (4) to be assembled is transported to the first spring placement position (1403) along the Z-axis direction. Then the spring feeding assembly (1300) is reset. The receiving platform (1401) moves along the Y-axis until the first spring placement position (1403) of the receiving platform (1401) corresponds to the force measuring position (1202); The sliding plate (1502) moves downward along the Z-axis. The pressure sensor (1504) compresses the spring (4) placed vertically on the first spring placement position (1403) and records the force value. At the same time, the second displacement measuring component (1505) measures the displacement of the sliding plate (1502). After the displacement reaches the standard, the sliding plate (1502) stops moving. The spring is judged to be qualified based on the force value and the displacement. The receiving platform (1401) moves along the Y-axis until the spring (4) that has completed the force measurement is in the loading position (1201). If the spring (4) fails the force test, the spring transfer assembly (1800) will transfer the unqualified spring to the unqualified material box (1900). If the spring (4) passes the force test, the spring attitude conversion assembly (1600) will clamp the spring (4) and convert the spring (4) from a vertical state to a horizontal state. The spring transfer assembly (1800) transfers the force-tested spring (4) from the second cylinder finger (1603) to the second spring placement position (1701). The spring compression assembly (700) moves to the second spring placement position (1701), the lower surface (801) of the top block abuts against the outer peripheral surface of the spring (4), and the pressing finger (702) of the spring compression assembly (700) clamps the two ends of the spring (4) and compresses the spring (4) to a predetermined length. The pump body (1) is positioned on the product positioning assembly (200); Driven by the X-axis motion assembly (100), the lever (302) of the lever assembly (300) rotates the swing ring (2) to increase the length of the spring mounting groove (5); The spring compression assembly (700), the spring (4), and the top block (800) are driven by the X-axis motion assembly (100) and the second Z-axis motion assembly (400) to extend into the spring mounting groove (5). After the extension reaches the set value, the third Z-axis motion assembly (600) drives the two pressing fingers (702) of the spring compression assembly (700) to move upward, so that the two pressing fingers (702) are pulled out from the spring mounting groove (5). After being pulled out, the spring (4) returns to its length, and the assembly is completed.

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