Spring and process

Abstract

The application relates to the technical field of spring processing, in particular to a spring and a processing technology, which comprises the step of simultaneously polishing two ends of a spring body by adopting a double polishing device, the double polishing device comprises a rack, two polishing discs and a feeding device, the two polishing discs are oppositely and spacedly arranged on the rack, the feeding device is located at the opposite position between the two polishing discs and on one side of the polishing disc, the distance between the two polishing discs is equal to the length of the spring body after polishing, the feeding device is used for extruding the two ends of the spring body, so that the length of the spring body after being pressed is smaller than the distance between the two polishing discs, the spring body enters between the two polishing discs, and the elasticity of the spring body drives the two ends of the spring body to abut against the end faces of the corresponding polishing discs respectively. The application has the effect of simultaneously polishing the two ends of the spring and improving the spring production efficiency.

Description

TECHNICAL FIELD

[0001] The application relates to the technical field of spring processing, in particular to a spring and a processing technology. BACKGROUND

[0002] A spring is a mechanical part working by elasticity. When the spring is processed, a coiled steel material is used as raw material, and then is stretched into a straight line. The steel material is usually spring steel. The straight steel material is coiled into a spiral spring. Some springs are processed by heating, that is, the steel material is heated and then coiled. Some springs are processed by cold working. The spiral spring needs to be ground at both ends due to the uneven shape of the end.

[0003] A spring end grinding device is disclosed in the related art, which comprises a first box body. A first motor is arranged on the right side of the bottom of the inner cavity of the first box body. A threaded rod is fixedly connected to the left side of the first motor. A support rod is installed on the threaded rod. A cross rod is fixedly arranged in the inner cavity of the first box body. A connecting rod is fixedly connected to the left side of the top of the cross rod. A first U-shaped plate is fixedly connected to the top of the right side of the connecting rod. A second U-shaped plate is fixedly connected to the top of the left side of the support rod. The first U-shaped plate and the second U-shaped plate are used for clamping a spring body. An electric telescopic rod is arranged above the spring body. A connecting plate is arranged at the lower end of the electric telescopic rod. A second motor is fixedly arranged on the connecting plate. A grinding disc is fixedly arranged at the bottom of the second motor. When the grinding disc is moved downward to abut against the spring body by the electric telescopic rod, the second motor drives the grinding disc to grind one end of the spring body. When the other end of the spring body needs to be ground, the spring body is disassembled from the first U-shaped plate and the second U-shaped plate, and then the end of the spring body that needs to be ground is upward, and then the grinding is performed.

[0004] However, the two ends of the spring body need to be ground in sequence in the above structure, which affects the production efficiency of the spring body. SUMMARY

[0005] In order to grind the two ends of the spring at the same time and improve the production efficiency of the spring, the application provides a spring and a processing technology.

[0006] The application provides a processing technology of a spring, which adopts the following technical scheme:

[0007] The processing technology of a spring comprises the steps of polishing two ends of a spring body simultaneously by using a double polishing device, the double polishing device comprises a frame, two polishing discs and a material feeding device, the two polishing discs are oppositely and spacedly arranged on the frame, the material feeding device is located at the opposite position between the two polishing discs and at one side of the polishing discs, the distance between the two polishing discs is equal to the length of the spring body after polishing, the material feeding device is used to squeeze the two ends of the spring body so that the length of the spring body after being squeezed is smaller than the distance between the two polishing discs, and the spring body enters between the two polishing discs, the elasticity of the spring body drives the two ends of the spring body to abut against the end faces of the corresponding polishing discs respectively.

[0008] By using the above technical scheme, when in use, the material feeding device is located at one side of the opposite position between the two polishing discs, the spring body to be polished is squeezed by the material feeding device, the two ends of the spring body are squeezed, the length of the spring body is shortened to be smaller than the distance between the two polishing discs, the spring body is placed between the two polishing discs, then the two ends of the spring body abut against the surfaces of the polishing discs under the elasticity of the spring body, the end portions of the spring body are rubbed on the surfaces of the polishing discs, the two ends of the spring body are polished simultaneously, and thus the production efficiency of the spring can be improved.

[0009] Preferably, the material feeding device comprises a material feeding cylinder and two squeezing plates, the two squeezing plates correspond to the two polishing discs one by one, the two squeezing plates are gradually inclined to the direction of moving away from each other from top to bottom, the distance between the upper portions of the two squeezing plates is smaller than the distance between the two polishing discs, the distance between the lower portions of the two squeezing plates is larger than the distance between the two polishing discs, the axis of the material feeding cylinder is parallel to the axis of the polishing disc and located between the two squeezing plates, the spring body is used to be placed into the material feeding cylinder, and the two ends of the spring body are squeezed by the opposite surfaces of the two squeezing plates.

[0010] By using the above technical scheme, the two squeezing plates correspond to the two polishing discs one by one, the distance between the upper portions of the two squeezing plates is smaller than the distance between the two polishing discs, and the distance between the lower portions of the two squeezing plates is larger than the distance between the two polishing discs, the spring body is placed into the spring body from the position of the lower portions of the two squeezing plates which is larger than the length of the spring body, then the length of the two spring bodies is shortened to the upper portions of the two squeezing plates, and then the spring body is placed between the two polishing discs after being squeezed.

[0011] Preferably, the material feeding device further comprises a driving assembly, the driving assembly comprises a rotating shaft and a material rack mounted on the rotating shaft, a plurality of the material feeding cylinders are mounted on the material rack and uniformly distributed around the circumference of the rotating shaft, the material rack is mounted on the rotating shaft and rotates with the rotating shaft, and the circular shape of the rotating of the material feeding cylinders intersects with the projection of the circular shape of the polishing discs along the axis direction of the polishing discs.

[0012] By adopting the technical scheme, the material rack is installed on the rotating shaft, and the plurality of material feeding cylinders are installed on the rotating shaft through the material rack. When the rotating shaft rotates, the spring body in the material feeding cylinder is rotated from the side away from the polishing disc to the side of the polishing disc. Since the circle in which the material feeding cylinder rotates around the rotating shaft intersects with the circle of the polishing disc, the spring body can enter the position of the polishing disc for polishing, so that the feeding of the spring body is convenient.

[0013] Preferably, one end of the rotating shaft is connected with an intermittent motion mechanism, the intermittent motion mechanism comprises a grooved wheel, a knob wheel and a first motor; the grooved wheel is coaxially connected on the rotating shaft, the knob wheel is coaxially connected on the output shaft of the first motor; the clamping column on the knob wheel is used for cooperating with the slot on the grooved wheel, and the movement speed of the first motor when the slot cooperates with the clamping column is smaller than the movement speed when the clamping column is out of the slot.

[0014] By adopting the technical scheme, when the first motor drives the knob wheel to rotate, the clamping column on the knob wheel is used for cooperating with the slot on the grooved wheel, and the grooved wheel is rotated by an angle interval of two slots, so that the rotating shaft stops moving to facilitate placing the spring body into the material feeding cylinder. Meanwhile, the movement speed of the first motor when the slot cooperates with the clamping column is smaller, so that when the first motor drives the spring body to move along the surface of the polishing disc, the spring body moves from the edge of the polishing disc to the center of the polishing disc, thereby making the wear of the polishing disc more uniform, so as to fully utilize the polishing disc.

[0015] Preferably, the lower part of the extrusion plate is provided with a discharge port; the middle part of the extrusion plate and the side away from the polishing disc are provided with an inlet, and the position of the inlet is provided with a blocking plate. When the blocking plate covers the position of the inlet, the blocking plate is flush with the inner side surface of the extrusion plate.

[0016] By adopting the technical scheme, the discharge port is located in the lower part of the extrusion plate, and the inlet is located in the middle part of the extrusion plate. When the material feeding cylinder first reaches the position of the discharge port, the spring body in the material feeding cylinder can be taken out from the material feeding cylinder first, and then moved to the position of the inlet, so as to facilitate placing the unpolished spring body into the material feeding cylinder. Moreover, the blocking plate is flush with the inner side surface of the extrusion plate, so as to facilitate moving the spring body on the extrusion plate along the blocking plate.

[0017] Preferably, the rack is provided with a guide rail, the length direction of the guide rail is parallel to the center line of the polishing disc; the rack is connected with two moving seats through the guide rail; the two polishing discs are correspondingly arranged with the two moving seats; the two moving seats are provided with a driving device for driving the two moving seats to move close to or away from each other; and the two extrusion plates are fixedly arranged with the two moving seats in one-to-one correspondence.

[0018] The length direction of the guide rail is parallel to the center line of the polishing disc, two moving seats are connected on the guide rail in a sliding mode, and a driving device is arranged between the two moving seats, the distance between the two polishing discs can be adjusted through the driving device, the product length of the spring body can be adjusted according to the movement of the two polishing discs, and the extrusion plate moves simultaneously with the moving seat.

[0019] Preferably, the driving device comprises a second motor and a screw rod, the second motor is fixed on the rack, the screw rod is arranged in parallel with the guide rail, the output shaft of the second motor is coaxially fixedly connected with the screw rod, and the two moving seats are threadedly connected with the screw rod, and the thread rotation directions of the corresponding positions of the two moving seats and the screw rod are opposite.

[0020] Through the above technical scheme, the second motor is fixed on the rack, the screw rod can move with the moving seat when the second motor is coaxially fixed on the screw rod, the thread rotation directions of the corresponding positions of the two moving seats and the screw rod are opposite, and then the two moving seats are simultaneously close to or away from each other to facilitate the adjustment of the distance between the two polishing discs.

[0021] Preferably, the two discharge cylinders are arranged at intervals along the center line direction of the discharge cylinder, and the two discharge cylinders rotate synchronously, the distance between the two discharge cylinders is adjusted according to the distance between the two moving seats to make the two discharge cylinders be located at the two ends of the spring body.

[0022] Through the above technical scheme, the two discharge cylinders are arranged at intervals, and the two discharge cylinders are located at the two ends of the spring body, so that the discharge cylinder can support the two ends of the spring, reduce the deformation of the spring body during polishing, and the distance between the two discharge cylinders is adjusted to adapt to the spring body of different lengths.

[0023] Preferably, the outer side of the blocking plate is provided with a blocking cylinder, a sliding seat is slidably connected on the rack, the blocking cylinder is fixed on the sliding seat, a material guiding table is installed on the sliding seat, the position of the material guiding table corresponds to the stop position of the discharge cylinder, and the material guiding table is fixed on the extrusion plate.

[0024] Through the above technical scheme, the blocking cylinder is connected with the blocking plate, the spring body is placed on the material guiding table, under the action of the blocking cylinder, the blocking plate pushes the spring body in the direction of the feeding port, and the material guiding table can guide the direction of the spring body, so as to facilitate the feeding of the spring body.

[0025] The application provides a spring, which adopts the following technical scheme:

[0026] The application provides a spring, which adopts the following technical scheme:

[0027] By adopting the above technical scheme, the spring body can be ground at both ends simultaneously, thereby improving the processing efficiency of the spring.

[0028] In summary, the present application includes at least one of the following beneficial technical effects:

[0029] 1. When the length of the spring body is shortened to less than the distance between the two grinding discs, the end of the spring body is rubbed on the surface of the grinding disc under its own elasticity, so that the two ends of the spring body are ground simultaneously, thereby improving the production efficiency of the spring;

[0030] 2. When the shaft rotates, the spring body in the feeding cylinder is rotated from the side away from the grinding disc to the side of the grinding disc. Since the circular motion of the feeding cylinder around the shaft intersects with the circular motion of the grinding disc, the spring body can be ground in the position of the grinding disc, making the feeding of the spring body more convenient;

[0031] 3. By arranging two feeding cylinders at intervals and placing them at both ends of the spring body, the feeding cylinders can support both ends of the spring, reducing the deformation of the spring body during grinding. BRIEF DESCRIPTION OF DRAWINGS

[0032] Figure 1 is the overall structure of the double grinding device in the embodiment of the present application Figure 1 ;

[0033] Figure 2 is the front view of the double grinding device in the embodiment of the present application;

[0034] Figure 3 is the installation structure diagram of the rack and the feeding cylinder in the embodiment of the present application;

[0035] Figure 4 is the overall structure of the double grinding device in the embodiment of the present application Figure 2 ;

[0036] Figure 5 is the installation structure diagram of the intermittent motion mechanism in the embodiment of the present application;

[0037] Figure 6 is the installation structure diagram of the driving device in the embodiment of the present application.

[0038] Explanation of reference signs: 1, spring body; 2, polishing disc; 21, moving seat; 3, material conveying device; 31, material discharging cylinder; 311, feeding port; 312, discharging port; 32, material extruding plate; 33, driving assembly; 331, rotating shaft; 332, intermittent motion mechanism; 3321, grooved wheel; 3322, pawl; 3323, first motor; 3324, clamping column; 333, material rack; 34, convex strip; 35, clamping groove; 36, mounting sleeve; 37, positioning screw; 4, feeding device; 41, blocking plate; 42, blocking cylinder; 43, material guiding table; 44, sliding seat; 51, discharging cylinder; 52, push block; 6, rack; 7, guide rail; 8, driving device; 81, second motor; 82, screw; 9, power device; 91, driving pulley; 92, driven pulley; 93, third motor; 94, transmission belt. DETAILED DESCRIPTION

[0039] The following will be described in detail with reference to the accompanying drawings. Figures 1-6 The present application is further described in detail.

[0040] The embodiment of the present application discloses a spring processing technology, referring to Figure 1 and Figure 2 , including the step of simultaneously polishing two ends of the spring body 1 by using a double polishing device. The double polishing device includes two polishing discs 2 and a material conveying device 3 arranged on one side between the two polishing discs 2. The two polishing discs 2 are oppositely arranged, and the center lines of the polishing discs 2 are horizontally and coaxially arranged. The two polishing discs 2 are spaced apart by a distance of the spring body 1. The material conveying device 3 conveys the spring body 1 to the position between the two polishing discs 2, and then the two polishing discs 2 relatively extrude the spring body 1. The spring body 1 is abutted by the surface of the polishing disc 2 by the elastic force of the spring body 1, so that the two ends of the spring body 1 can be polished by the polishing disc 2.

[0041] Reference Figure 1 and Figure 2The feeding device 3 comprises a feeding cylinder 31 and two extruding plates 32, one extruding plate 32 is matched with one polishing disc 2, the polishing disc 2 is installed on the moving seat 21, and the extruding plate 32 is fixed on the moving seat 21, so that the position of the extruding plate 32 and the end surface of the polishing disc 2 is fixed, the extruding plate 32 is inclined from top to bottom in the vertical direction, and the distance between the upper positions of the two extruding plates 32 is smaller than the distance between the two polishing discs 2, and the distance between the lower positions of the two extruding plates 32 is larger than the distance between the two polishing discs 2, the feeding cylinder 31 is connected with a driving assembly 33, the feeding cylinder 31 is driven by the driving assembly 33 and moves between the two extruding plates 32, the feeding cylinder 31 is in a cylindrical structure, and the spring body 1 is conveniently placed in the feeding cylinder 31. When the feeding cylinder 31 moves from the position with a large distance between the two extruding plates 32 to the position with a small distance between the two extruding plates 32, the both ends of the spring body 1 slide on the surface of the extruding plate 32, and the length of the spring body 1 is reduced by the extruding plate 32.

[0042] Reference Figure 2 and Figure 3 The driving assembly 33 comprises a rotating shaft 331 and an intermittent motion mechanism 332, the rotating shaft 331 is rotatably connected to the moving seat 21 through a sliding bearing, and the intermittent motion mechanism 332 is connected to one end of the rotating shaft 331, so that the intermittent motion mechanism 332 can drive the rotating shaft 331 to rotate intermittently. The feeding cylinder 31 is provided with a plurality of racks 333, the racks 333 are coaxially rotatable with the rotating shaft 331, the plurality of feeding cylinders 31 are uniformly distributed around the center line of the rotating shaft 331 in the circumferential direction, and the circle formed by the rotation of the feeding cylinder 31 around the center line of rotation intersects with the projection of the circle formed by the polishing disc 2 in the direction along the axis of the feeding cylinder 31, so that the spring body 1 in the feeding cylinder 31 can be rotated into the circle formed by the polishing disc 2 along with the rotation of the feeding cylinder 31.

[0043] Reference Figure 4The feeding port 311 is arranged at the middle of the extruding plate 32 and away from one side of the polishing disc 2, and the discharging port 312 is arranged at the bottom of the extruding plate 32. The feeding device 4 is arranged at one side of the feeding port 311 and comprises a blocking plate 41 and a blocking cylinder 42. A guide table 43 is arranged at the outside of the extruding plate 32 and is in the shape of a groove. The length direction of the guide table 43 is parallel to the length direction of the discharging cylinder 31. The bottom position of the guide table 43 corresponds to the intermittent stop position of one discharging cylinder 31. The guide table 43 is used for placing one spring body 1. The blocking cylinder 42 is fixedly installed on the guide table 43, and the output direction of the blocking cylinder 42 is parallel to the length direction of the guide table 43. The blocking plate 41 is fixed to the output end of the blocking cylinder 42, and the blocking plate 41 is driven by the blocking cylinder 42 to move close to or away from the feeding port 311. When the blocking plate 41 is moved to the position of the feeding port 311 by the blocking cylinder 42, the side of the blocking plate 41 which is inside the extruding plate 32 is flush with the inside of the extruding plate 32. When it is needed to place the spring body 1 into the discharging cylinder 31, the blocking plate 41 is first moved away from the discharging port 312, and then the spring body 1 is placed on the guide table 43. The blocking plate 41 is driven by the blocking cylinder 42 to move the spring body 1 in the direction of the feeding port 311. Since the guide table 43 corresponds to the position of one discharging cylinder 31, the spring body 1 can be pushed into one discharging cylinder 31 under the action of the blocking plate 41. The spring body 1 can move along the surface of the blocking plate 41 to the position between the two extruding plates 32 and then enter the position between the two polishing discs 2 as the discharging cylinder 31 continues to move upward.

[0044] Reference Figure 4 The discharging port 312 is arranged on one extruding plate 32, and the discharging cylinder 51 is arranged at the position opposite to the discharging port 312 on the other extruding plate 32. The end of the discharging cylinder 51 is connected with a push block 52. The output direction of the discharging cylinder 51 is parallel to the length direction of the discharging cylinder 31. The discharging cylinder 51 drives the push block 52 to move into the discharging cylinder 31, so that the spring body 1 with the ground end in the discharging cylinder 31 is extruded from one side of the discharging port 312. Since the discharging port 312 is located below the extruding plate 32 and the feeding port 311 is located at the middle of the extruding plate 32, the spring body 1 can be taken out from the discharging cylinder 31 in time and then placed into the unground spring body 1.

[0045] Reference Figure 4The double grinding device further comprises a rack 6, a sliding seat 44 is arranged below the material guiding table 43, the sliding seat 44 is slidingly connected to the rack 6, and the sliding direction of the sliding seat 44 relative to the rack 6 is parallel to the length direction of the material discharging cylinder 31. The material guiding table 43 is fixed to the extruding plate 32 at one end of the extruding plate 32, and the position of the material guiding table 43 can move along with the position of the extruding plate 32 when the position of the extruding plate 32 moves, so that the position of the blocking plate 41 at the feeding port 311 can be accurately positioned.

[0046] With reference to Figure 5 The material discharging cylinder 31 is arranged at intervals in the same axial direction, and the two material discharging cylinders 31 arranged at intervals are respectively connected to corresponding material racks 333. The two material racks 333 are slidingly connected to the rotating shaft 331. A convex strip 34 is fixedly arranged on the side wall of the rotating shaft 331 and arranged along the length direction of the rotating shaft 331. A clamping groove 35 is arranged on the material rack 333, and the clamping groove 35 is connected to the convex strip 34, so that the rotating shaft 331 can rotate with the material rack 333. One mounting sleeve 36 is fixedly arranged on each material rack 333, the mounting sleeve 36 is sleeved on the rotating shaft 331, a positioning screw 37 is threadedly connected to the side wall of the mounting sleeve 36, the positioning screw 37 is perpendicular to the center line of the rotating shaft 331, one end of the positioning screw 37 can be pressed on the side wall of the rotating shaft 331, and the position of the material rack 333 on the rotating shaft 331 is fixed by the positioning screw 37. When the spring body 1 of different lengths needs to be polished, the positions of the two material racks 333 are moved first, and the material discharging cylinders 31 installed on the two material racks 333 are supported at the two end positions of the spring body 1.

[0047] With reference to Figure 5The intermittent motion mechanism 332 comprises a grooved wheel 3321, a dial wheel 3322 and a first motor 3323. The grooved wheel 3321 is coaxially fixed on the rotating shaft 331. The first motor 3323 is fixed on the moving seat 21. The dial wheel 3322 is coaxially fixed on the output shaft of the first motor 3323. The number of slots on the grooved wheel 3321 is the same as the number of the dispensing barrels 31 arranged on the rotating shaft 331 in the circumferential direction. The dial wheel 3322 has a clamping column 3324 matched with the slots. When the dial wheel 3322 rotates one circle, the clamping column 3324 enters one slot of the grooved wheel 3321 and pushes the grooved wheel 3321 to move by an angle interval between two slots, so that the rotating shaft 331 can keep intermittent motion under the action of the intermittent motion mechanism 332, thereby facilitating the spring body 1 to be put into the dispensing barrel 31 and taken out of the dispensing barrel 31. The first motor 3323 is a servo motor. The rotating speed of the first motor 3323 is reduced during the matching process of the clamping column 3324 and the slot. When the clamping column 3324 is separated from the slot, the rotating speed of the first motor 3323 is increased, the stop time of the intermittent motion mechanism 332 is reduced, the process time of putting the spring body 1 into the dispensing barrel 31 and taking the spring body 1 out of the dispensing barrel 31 is reduced, the time occupation of feeding and discharging is saved, and the spring body 1 can gradually move to the center of the grinding disc 2 along the edge of the grinding disc 2 during the grinding process, so that the end surface of the grinding disc 2 can be uniformly worn.

[0048] Referring to Figure 6 A guide rail 7 is fixedly arranged on the rack 6, the length direction of the guide rail 7 is parallel to the dispensing barrel 31, the moving seat 21 is slidably connected to the rack 6 through the guide rail 7, two grinding discs 2 are respectively installed on one moving seat 21, a driving device 8 is installed on the rack 6, the driving device 8 comprises a second motor 81 and a screw rod 82, the second motor 81 is fixed on the rack 6, the screw rod 82 is parallel to the guide rail 7, the screw rod 82 is rotationally connected to the rack 6, and one end of the screw rod 82 is coaxially fixed on the output shaft of the second motor 81. The moving seat 21 is threadedly connected with the screw rod 82, and the thread directions of the moving seat 21 and the screw rod 82 at the connection parts are opposite, so that when the screw rod 82 rotates, the two moving seats 21 are simultaneously driven to move close to or away from each other, so that the relative distance between the grinding discs 2 installed on the moving seats 21 is adjusted. The distance between the two grinding discs 2 is equal to the length of the spring body 1 after grinding, so that the two grinding discs 2 can simultaneously grind the two ends of the spring body 1, thereby improving the grinding efficiency of the spring body 1.

[0049] Referring to Figure 6A power device 9 is connected to each polishing disc 2, the power device 9 comprising a driving pulley 91, a driven pulley 92 and a third motor 93, the third motor 93 being fixed on the moving base 21, the output shaft of the third motor 93 being coaxially fixed with the driving pulley 91, the driven pulley 92 being coaxially fixed on the polishing disc 2, a transmission belt 94 being connected between the driven pulley 92 and the driving pulley 91, so that the transmission belt 94 can transmit power from the driving pulley 91 to the driven pulley 92, and then the third motor 93 can drive the polishing disc 2 to rotate.

[0050] The embodiment also discloses a spring, comprising a spring body 1 produced by the processing technology of the spring.

[0051] The above are preferred embodiments of the present application, which do not limit the protection scope of the present application, therefore: any equivalent changes made on the structure, shape and principle of the present application should be covered within the protection scope of the present application.

Claims

1. A process for the manufacture of a spring, characterized in that: The method comprises the steps of simultaneously polishing two ends of a spring body (1) by using a double polishing device, the double polishing device comprises a rack (6), two polishing discs (2) and a feeding device (3), the two polishing discs (2) are oppositely and spacedly arranged on the rack (6), the feeding device (3) is located at a position opposite to the two polishing discs (2) and on one side of the polishing disc (2), the distance between the two polishing discs (2) is equal to the length of the spring body (1) after polishing, the feeding device (3) is used for extruding the two ends of the spring body (1) so that the length of the spring body (1) after being extruded is smaller than the distance between the two polishing discs (2), and the spring body (1) enters between the two polishing discs (2), and the elasticity of the spring body (1) drives the two ends of the spring body (1) to abut on the end faces of the corresponding polishing discs (2) respectively; The feeding device (3) comprises a feeding cylinder (31) and two extruding plates (32), the two extruding plates (32) correspond to the two polishing discs (2) respectively, and the two extruding plates (32) are gradually inclined to the direction away from each other from top to bottom; the distance between the upper portions of the two extruding plates (32) is smaller than the distance between the two polishing discs (2), and the distance between the lower portions of the two extruding plates (32) is greater than the distance between the two polishing discs (2), the axis of the feeding cylinder (31) is parallel to the axis of the polishing disc (2) and located between the two extruding plates (32), and the spring body (1) is used for being placed into the feeding cylinder (31), and the two ends of the spring body (1) are extruded by the opposite surfaces of the extruding plates (32); A discharging port (312) is formed in the lower portion of the extruding plate (32); a feeding port (311) is formed in the middle portion of the extruding plate (32) and away from the polishing disc (2), a blocking plate (41) is arranged at the position of the feeding port (311), and the blocking plate (41) is flush with the inner side surface of the extruding plate (32) when the blocking plate (41) covers the position of the feeding port (311); A blocking cylinder (42) is arranged on the outer side of the blocking plate (41), a sliding seat (44) is slidably connected to the rack (6), the blocking cylinder (42) is fixed on the sliding seat (44), a material guiding table (43) is installed on the sliding seat (44), and the position of the material guiding table (43) corresponds to the stop position of the feeding cylinder (31); and the material guiding table (43) is fixed on the extruding plate (32); The discharging port (312) is arranged on one extruding plate (32), a discharging cylinder (51) is arranged on the extruding plate (32) opposite to the discharging port (312), an end portion of the discharging cylinder (51) is connected with a push block (52), and the discharging cylinder (51) drives the push block (52) to move into the feeding cylinder (31).

2. A process for working a spring as claimed in claim 1, characterized in that: The feeding device (3) further comprises a driving assembly (33), the driving assembly (33) comprises a rotating shaft (331) and a rack (333) installed on the rotating shaft (331), a plurality of the feeding cylinders (31) are installed on the rack (333), and the plurality of the feeding cylinders (31) are uniformly distributed around the circumference of the rotating shaft (331); the rack (333) is installed on the rotating shaft (331) and rotates with the rotating shaft (331), and the circle in which the feeding cylinders (31) rotate around the rotating shaft (331) intersects with the projection of the polishing disc (2) in the direction along the axis of the polishing disc (2).

3. A process for working a spring as claimed in claim 2, characterized in that: One end of the rotating shaft (331) is connected with an intermittent motion mechanism (332), the intermittent motion mechanism (332) comprises a grooved wheel (3321), a ratchet wheel (3322) and a first motor (3323); the grooved wheel (3321) is coaxially connected on the rotating shaft (331), the ratchet wheel (3322) is coaxially connected on the output shaft of the first motor (3323); the clamping column (3324) on the ratchet wheel (3322) is used for cooperating with the notch on the grooved wheel (3321), and the movement speed of the first motor (3323) when the notch cooperates with the clamping column (3324) is less than the movement speed when the clamping column (3324) is out of the notch.

4. The process of claim 1 wherein: The rack (6) is provided with a guide rail (7), the length direction of the guide rail (7) is parallel to the center line of the polishing disc (2); the rack (6) is connected with two moving seats (21) through the guide rail (7); the two polishing discs (2) and the two moving seats (21) are correspondingly arranged, and the two moving seats (21) are provided with a driving device (8) for driving the two moving seats (21) to move close to or away from each other, and the two extrusion plates (32) are fixedly arranged corresponding to the two moving seats (21).

5. A process for working a spring as claimed in claim 4, characterized in that: The driving device (8) comprises a second motor (81) and a screw rod (82), the second motor (81) is fixed on the rack (6), the screw rod (82) is parallel to the guide rail (7), the output shaft of the second motor (81) is coaxially fixedly connected with the screw rod (82), the two moving seats (21) are threadedly connected with the screw rod (82), and the thread rotation directions of the corresponding positions of the two moving seats (21) and the screw rod (82) are opposite.

6. A process for working a spring as claimed in claim 4, characterized in that: The feeding cylinders (31) are arranged at least at intervals of two along the center line direction of the feeding cylinder (31), and the two feeding cylinders (31) rotate synchronously, and the distance between the two feeding cylinders (31) is adjusted according to the distance between the two moving seats (21) to make the two feeding cylinders (31) be located at the two ends of the spring body (1).

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