A device for detecting the performance of precision springs

Abstract

The present invention relates to the technical field of devices for detecting spring performance, and specifically to a device for detecting the performance of precision springs, comprising a base, a stabilizing surface shell being fixedly mounted on the upper end of the base, a movable tube being arranged at one end of the stabilizing surface shell close to a movable frame, a compression cylinder being mounted at one end of the movable frame away from the stabilizing surface shell, a movable rod being mounted inside the compression cylinder, a stabilizing sleeve being mounted on the inner bottom end of the stabilizing surface shell, a stabilizing cylinder being fixedly mounted on the inner bottom end of the stabilizing surface shell, a pressure buffer device being arranged inside the stabilizing cylinder, and an interruption device being arranged inside the movable tube. During the spring stretching process, the test is stopped on the spring in the failure or plastic deformation stage, at which time the data obtained can no longer reflect the true elastic performance of the spring, and unnecessary stretching processes can be avoided, saving detection time and resources, and detection personnel can quickly analyze the problem and carry out other necessary experiments instead of continuing to waste time on invalid tests.

Description

Technical Field

[0001] The invention relates to the technical field of devices for detecting spring performance, and in particular to a device for detecting the performance of a precision spring. Background Art

[0002] Precision springs are widely used in machinery, electronics, automobiles, aerospace and other fields. The stability and reliability of their performance directly affect the overall performance of related equipment, especially in high-precision and high-requirement applications, such as automatic control systems, sensors, precision instruments, etc. The performance parameters of springs (such as stiffness, elasticity, fatigue life, etc.) are particularly critical. Therefore, how to effectively and accurately detect the performance parameters of precision springs has become an important research direction in the industry.

[0003] After searching, it was found that the prior art announcement number is CN217930758U, which discloses a device for detecting the performance of precision springs; it relates to the field of medical spring detection technology, including a base plate, the upper surface of the base plate is fixedly connected to two vertical plates, the right side of each vertical plate is fixedly inlaid with a bearing, the side of the two vertical plates away from each other is provided with a motor, the output end of each motor is fixedly connected to a threaded rod, and the ends of the two threaded rods close to each other respectively penetrate two bearings and extend between the two vertical plates. This scheme can drive the threaded rod to rotate in the inner circle of the threaded barrel by the cooperation of the motor, the threaded rod, the threaded barrel and the arc plate, and the threaded barrel is fixed by the fixed rod to prevent the threaded barrel from rotating, so the threaded barrel will drive the arc plate to move, and the two arc plates will gradually wrap up the spring to prevent it from collapsing and flying, so as to avoid accidental injury to the staff.

[0004] Therefore, based on the above search and combined with existing technologies, in the process of testing the elastic performance of the spring, after the spring undergoes plastic deformation, its mechanical properties can no longer return to the initial state. Continuing the test will cause the measured data to lose its reference value, because after plastic deformation, the spring no longer has the original elastic properties. For this reason, we propose a device for testing the performance of precision springs. Summary of the invention

[0005] The object of the present invention is to provide a device for detecting the performance of a precision spring, so as to solve the problems raised in the above background technology.

[0006] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: a device for detecting the performance of precision springs, comprising a base, a stabilizing frame fixedly installed on the right end of the base, a movable frame slidably installed on the end of the stabilizing frame away from the base, a stabilizing surface shell fixedly installed on the upper end of the base, and the stabilizing surface shell is located above the movable frame, a movable tube is provided on the end of the stabilizing surface shell close to the movable frame, a compression cylinder is fixedly installed on the end of the movable frame away from the stabilizing surface shell, and a movable rod is slidably installed on the inner end of the compression cylinder, and the ends of the movable rod and the movable tube close to each other are fixedly installed with hooks for hooking the spring, a stabilizing sleeve is fixedly installed on the inner bottom end of the stabilizing surface shell, the stabilizing sleeve is sleeved on the outer surface of the movable tube, an adjusting knob is rotatably installed on the left end of the stabilizing surface shell, a stabilizing cylinder is fixedly installed on the inner bottom end of the stabilizing surface shell, a pressure buffer device for outputting tensile pressure is provided inside the stabilizing cylinder, and an interruption device is provided inside the movable tube to prevent continued stretching when the elastic limit of the spring is exceeded.

[0007] As a further solution of the present invention, a pressure tube is provided at the upper end of the stabilizing frame, and the end of the pressure tube close to the stabilizing surface shell is fixedly connected to an upstream pipe, the free end of the upstream pipe is passed through the interior of the stabilizing surface shell, and the end of the upstream pipe close to the pressure tube is fixedly connected to a downstream pipe, the free end of the downstream pipe is fixedly connected to the compression cylinder, and a bottom plate is fixedly installed at the bottom end of the movable rod, and the outer surface of the bottom plate is tightly fitted with the interior of the compression cylinder.

[0008] As a further solution of the present invention, the interruption device includes a center tube, which is located inside the movable tube. Two rectangular holes are opened on the outer surface of the movable tube. Two connecting blocks are fixedly installed on the outer surface of the center tube, and the connecting blocks are fixedly connected to the stabilizing surface shell after passing through the rectangular holes. The center tube is fixedly installed on the upper end of the movable tube, and a gravity rod is passed through the interior of the center tube, and the bottom end of the gravity rod is passed through the interior of the center tube.

[0009] As a further solution of the present invention, a free tube is fixedly installed on the inner upper end of the movable tube, and the bottom end of the free tube is passed through the interior of the central tube. The free tube and the central tube are connected by a reset spring, an airbag is fixedly installed on the inner end of the free tube, and an abutment rod is fixedly installed on one end of the gravity rod close to the airbag.

[0010] As a further solution of the present invention, a plurality of blocks are penetrated through the outer surface of the free tube, and a plurality of bayonet holes are opened on the outer surface of the central tube, the bayonet holes correspond to the blocks, and after the blocks move in the direction away from the free tube, they are penetrated into the bayonet holes, and a plurality of triangular blocks are fixedly installed on the upper end of the airbag, and the triangular blocks correspond to the blocks.

[0011] As a further solution of the present invention, a push plug is fixedly installed on the outer surface of the gravity rod, and the push plug is located inside the central tube. An upper sleeve is fixedly installed on the inner upper end of the stabilizing surface shell, and the upper sleeve is sleeved on the outer surface of the central tube.

[0012] As a further solution of the present invention, the left end of the central tube is fixedly connected to a pressure relief cylinder, the outer surface of the central tube is fixedly connected to a liquid outlet pipe, the liquid outlet pipe is inserted into the interior of the pressure relief cylinder, the inner end of the pressure relief cylinder is fixedly installed with a conical tube, the conical tube is located on the left side of the liquid outlet pipe, and the end of the pressure relief cylinder away from the central tube is fixedly connected to the pressure relief pipe, the free end of the pressure relief pipe is connected to the upper sleeve, the bottom end of the pressure relief cylinder is fixedly connected to a return pipe, and the return pipe corresponds to the on-off pipe, and the free end of the return pipe is fixedly connected to the upper end of the guide rod.

[0013] As a further solution of the present invention, a conical block is passed through the inner end of the conical tube, and a stabilizing rod is slidably connected to the inner end of the liquid outlet tube, and a power-assisting disk is fixedly installed at the end of the stabilizing rod away from the liquid outlet tube, the power-assisting disk corresponds to the conical block, and a plurality of extrusion rods are rotatably installed at the end of the conical block close to the power-assisting disk, and the right end of the extrusion rod is located in the power-assisting disk, a stop-and-go tube is fixedly installed at the inner left end of the pressure relief cylinder, and a stop-and-go block is slidably installed at the inner end of the stop-and-go tube.

[0014] As a further solution of the present invention, the pressure buffer device includes an extrusion sheet, which is wound on the outer surface of the stabilizing cylinder, a traction rope is fixedly wound on the outer surface of the adjusting knob, the free end of the traction rope is fixedly connected to any end of the extrusion sheet, a resistance tube is fixedly installed on the inner end of the stabilizing cylinder, a movable sleeve is slidably installed on the inner end of the resistance tube, and a telescopic tube is fixedly installed on the bottom end of the movable sleeve.

[0015] As a further solution of the present invention, a guide rod is fixedly installed on the inner end of the resistance tube, a guide hole is provided on the outer surface of the guide rod, the movable sleeve is arranged on the outer surface of the guide rod, a conducting hole is provided on the end of the movable sleeve close to the guide rod, when the movable sleeve moves to the uppermost side of the outer surface of the guide rod, the conducting hole corresponds to the guide hole, a plurality of guide cylinders are fixedly installed on the outer surface of the resistance tube, the guide cylinders are arranged in a ring shape, abutment balls are slidably installed on the inner ends of the guide cylinders, abutment sheets are provided on the side of the guide cylinder away from the resistance tube, and the abutment sheets and the abutment balls are connected by a resistance spring, and the end of the abutment sheet away from the guide cylinder is in contact with the inner wall of the extrusion sheet.

[0016] Compared with the prior art, the present invention has the following beneficial effects:

[0017] 1. When the present invention is used, during the spring stretching process, by stopping the test on the spring in the failure or plastic deformation stage, the data obtained at this time can no longer reflect the true elastic performance of the spring, which can avoid unnecessary stretching process, save detection time and resources, and the detection personnel can quickly analyze the problem and carry out other necessary experiments instead of continuing to waste time on invalid tests;

[0018] 2. When the present invention is used, by changing the resistance of the movable sleeve to simulate the increasing resistance, the performance of the spring under actual use conditions can be more realistically reflected, thereby obtaining more accurate test data. At the same time, the gradually increasing resistance can allow the inspector to clearly see when the spring or material begins to lose force or plastically deform, which is helpful for analyzing its performance limit. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a structural schematic diagram of a device for detecting the performance of a precision spring;

[0020] Figure 2 A schematic diagram of the structure for stabilizing the face shell and the movable frame;

[0021] Figure 3 It is a schematic diagram of the structure inside the compression cylinder;

[0022] Figure 4 A schematic diagram of the structure inside the stable face shell;

[0023] Figure 5 It is a schematic diagram of the structure inside the movable tube;

[0024] Figure 6 This is a schematic diagram of the structure inside the central tube;

[0025] Figure 7 It is a schematic diagram of the structure inside the free tube;

[0026] Figure 8 It is a schematic diagram of the structure inside the pressure relief cylinder;

[0027] Fig. 9 Schematic diagram of the structure inside the conical tube;

[0028] Fig.10 It is a schematic diagram of the structure at the bottom end of the inner side of the stable surface shell;

[0029] Fig.11 It is a structural schematic diagram of the position relationship between the adjustment knob and the extrusion sheet;

[0030] Fig.12 It is a schematic diagram of the structure inside the resistance tube;

[0031] Fig.13 Schematic diagram of the structure inside the guide cylinder.

[0032] In the figure: 1, base; 2, stabilizing frame; 3, movable frame; 4, stabilizing surface shell; 5, adjusting knob; 6, hook; 11, upstream pipe; 12, pressure pipe; 13, downstream pipe; 101, compression cylinder; 102, movable rod; 103, negative film; 104, connecting block;

[0033] 201, movable tube; 202, stabilizing sleeve; 203, central tube; 204, upper sleeve; 205, central tube; 206, gravity rod; 207, push plug; 208, bayonet; 209, return spring; 210, air bag; 211, block; 212, abutment rod; 213, triangular block; 214, free tube; 215, liquid outlet tube;

[0034] 301, pressure relief cylinder; 302, return pipe; 303, pressure relief pipe; 304, conduction pipe; 305, tapered pipe; 306, extrusion rod; 307, power plate; 308, on-off pipe; 309, on-off block; 310, tapered block; 311, movable wheel; 312, stabilizer bar;

[0035] 401, stabilizing cylinder; 402, traction rope; 403, extrusion sheet; 404, resistance tube; 405, guide rod; 406, telescopic tube; 407, conducting hole; 408, abutment sheet; 409, abutment ball; 410, guide cylinder; 411, guide hole; 412, resistance spring; 413, movable sleeve. DETAILED DESCRIPTION

[0036] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0037] Example 1: Please refer to Figures 1 to 3A device for detecting the performance of a precision spring comprises a base 1, a stabilizing frame 2 is fixedly mounted on the right end of the base 1, a movable frame 3 is slidably mounted on the end of the stabilizing frame 2 away from the base 1, specifically, a locking clip is rotatably mounted on the upper end of the movable frame 3, a plurality of card slots are provided on the end of the stabilizing frame 2 close to the movable frame 3, after the movable frame 3 is fixed to a specified position, the locking clip is rotated to clamp it in the card slot, and the movable frame 3 can be fixed, and a stabilizing surface shell 4 is fixedly mounted on the upper end of the base 1 by bolts, and the stabilizing surface shell 4 Located above the movable frame 3, a movable tube 201 is provided at one end of the stable surface shell 4 close to the movable frame 3, a compression cylinder 101 is fixedly installed at one end of the movable frame 3 away from the stable surface shell 4, and a movable rod 102 is slidably installed at the inner end of the compression cylinder 101, and a hook 6 for hooking a spring is fixedly installed at one end of the movable rod 102 and the movable tube 201 close to each other, and the upper and lower ends of the spring are hung on the hooks 6 on the upper and lower sides, and the movable rod 102 moves downward, driving the lower hook 6 to move downward, so as to realize the tensile test of the spring;

[0038] like Figure 2 , 3 As shown, a pressure pipe 12 is provided at the upper end of the stabilizing frame 2, and an end of the pressure pipe 12 close to the stabilizing surface shell 4 is fixedly connected to an upstream pipe 11, and a hydraulic press is provided inside the stabilizing frame 2 (not shown in the figure, the hydraulic press is an existing mature technology, and no further description is given here), and an end of the pressure pipe 12 away from the stabilizing surface shell 4 is fixedly connected to the output end of the hydraulic press, and the free end of the upstream pipe 11 is passed through the interior of the stabilizing surface shell 4, and an end of the upstream pipe 11 close to the pressure pipe 12 is fixedly connected to a downstream pipe 13, and the downstream The free end of the tube 13 is fixedly connected to the compression cylinder 101. Specifically, a bottom plate 103 is fixedly installed at the bottom end of the movable rod 102. The outer surface of the bottom plate 103 is tightly fitted with the inside of the compression cylinder 101. A sealing rubber ring is fixedly installed on the outer surface of the bottom plate 103 to increase air tightness. The output port of the downflow pipe 13 is located above the bottom plate 103. When the downflow pipe 13 outputs hydraulic oil, the bottom plate 103 is squeezed to move downward, and then the bottom plate 103 drives the movable rod 102 to move downward.

[0039] See also Figure 2 , 3 4. A stabilizing sleeve 202 is fixedly installed on the inner bottom end of the stabilizing surface shell 4. The stabilizing sleeve 202 is sleeved on the outer surface of the movable tube 201. An adjusting knob 5 is rotatably installed on the left end of the stabilizing surface shell 4. A stabilizing cylinder 401 is fixedly installed on the inner bottom end of the stabilizing surface shell 4. A pressure buffer device for outputting tensile pressure is arranged inside the stabilizing cylinder 401. An interrupting device is arranged inside the movable tube 201 to prevent continued stretching when the elastic limit of the spring is exceeded.

[0040] Example 2: Please refer to Figure 4 , 5, 6, 7, a device for detecting the performance of a precision spring, based on Example 1, the interruption device includes a central tube 205, the central tube 205 is located inside the movable tube 201, specifically, the outer surface of the movable tube 201 is provided with two rectangular holes, the outer surface of the central tube 205 is fixedly installed with two connecting blocks 104, the two connecting blocks 104 correspond to the rectangular holes, and the connecting blocks 104 are fixedly connected to the stabilizing surface shell 4 after passing through the rectangular holes, the upper end of the movable tube 201 is fixedly installed with a central tube 203, and the interior of the central tube 203 is penetrated with a gravity rod 206, and the bottom end of the gravity rod 206 is inserted into the interior of the central tube 205, a free tube 214 is fixedly installed on the inner upper end of the movable tube 201, and the bottom end of the free tube 214 is inserted into the interior of the central tube 205, the free tube 214 and the central tube 205 are connected by a return spring 209, an air bag 210 is fixedly installed on the inner end of the free tube 214, the air bag 210 is made of rubber and has elasticity, and an abutment rod 212 is fixedly welded to one end of the gravity rod 206 close to the air bag 210, and the diameter of the abutment rod 212 is smaller than the diameter of the gravity rod 206;

[0041] like Figure 6 , 7 The outer surface of the free tube 214 is penetrated with a plurality of blocks 211, and the abutment rod 212 is located at one end where the plurality of blocks 211 are close to each other. The outer surface of the center tube 205 is provided with a plurality of bayonet holes 208, and the bayonet holes 208 correspond to the blocks 211. Specifically, a rectangular block is fixedly installed on the outer surface of the free tube 214, and a rectangular groove is provided at the inner end of the center tube 205. The rectangular block is located in the rectangular groove to prevent the free tube 214 from rotating when it moves up and down in the center tube 205. After the block 211 moves in a direction away from the free tube 214, it is penetrated in the bayonet hole 208. The upper end of the airbag 210 is fixedly installed with a plurality of The triangular block 213 corresponds to the clamping block 211. More specifically, one end of the clamping block 211 close to the triangular block 213 is rounded, and the rounded corner is in contact with the slope surface of the triangular block 213. The return spring 209 is compressed and then released instantly, and pushes the movable tube 201 to move upward through the free tube 214. The gravity rod 206 remains motionless under the action of inertia, and then the airbag 210 also moves upward, and the upper end contacts the abutment rod 212. Under the interaction of forces, the airbag 210 begins to expand, and then under the limitation of the internal space of the free tube 214, the triangular block 213 is pushed to move upward;

[0042] A push plug 207 is fixedly installed on the outer surface of the gravity rod 206. The push plug 207 is located inside the center tube 203. An upper sleeve 204 is fixedly installed on the inner upper end of the stabilizing surface shell 4. The upper sleeve 204 is sleeved on the outer surface of the center tube 203. A pressure sensor is fixedly installed on the inner end of the upper sleeve 204. The pressure sensor is an existing mature technology and will not be described in detail here. The pressure sensor is electrically connected to the hydraulic machine. When the pressure sensor senses that the pressure inside the upper sleeve 204 becomes larger, it sends an electrical signal to the control device inside the hydraulic machine, so that the control device inside the hydraulic machine can stop the hydraulic machine in time. Hydraulic oil is filled between the push plug 207 and the center tube 203. Specifically, a sealing rubber ring is fixedly installed on the outer surface of the push plug 207. The sealing rubber ring contacts the inner wall of the center tube 203 to prevent leakage of hydraulic oil and improve sealing. A sealing cover is fixedly installed on the inner end of the center tube 203.

[0043] like Figure 4 , 8 As shown, the left end of the central tube 203 is fixedly connected with the pressure relief tube 301, the outer surface of the central tube 203 is fixedly connected with the liquid outlet pipe 215, the liquid outlet pipe 215 is arranged inside the pressure relief tube 301, the liquid outlet pipe 215 is located below the sealing cover, the inner end of the pressure relief tube 301 is fixedly installed with a tapered tube 305, the outer surfaces of the left and right ends of the tapered tube 305 are fixedly connected with the inner wall of the pressure relief tube 301, the tapered tube 305 is located on the left side of the liquid outlet pipe 215, and the end of the pressure relief tube 301 away from the central tube 203 is fixedly connected with the pressure relief tube 303, and the free end of the pressure relief tube 303 is connected with the upper sleeve 204;

[0044] See also Figure 8 , 9As shown, a conical block 310 is passed through the inner end of the conical tube 305, and the left diameter of the conical block 310 is larger than the minimum diameter at the center of the conical tube 305. Therefore, the conical block 310 cannot move from the left side to the right side of the conical tube 305. A sealing rubber ring is fixedly installed on the outer surface of the conical block 310 to increase the air tightness between the conical tube 305 and the conical block 310. A stabilizing rod 312 is slidably connected to the inner end of the liquid outlet pipe 215. The outer surface of the stabilizing rod 312 is tightly fitted with the inside of the liquid outlet pipe 215. A power assisting plate 307 is fixedly installed on the end of the stabilizing rod 312 away from the liquid outlet pipe 215. The power assisting plate 307 corresponds to the conical block 310, and the conical block A plurality of extrusion rods 306 are rotatably mounted on one end of 310 close to the assisting disk 307. Torsion springs are clamped between the extrusion rods 306 and the conical block 310. Driven by the elastic force of the torsion springs, the right side of the extrusion rods 306 is in an open state, and the right end of the extrusion rods 306 is located in the assisting disk 307. Specifically, a movable wheel 311 is rotatably mounted on one end of the extrusion rods 306 close to the assisting disk 307. The interior of the assisting disk 307 is a mutually conical shape. When the assisting disk 307 moves toward the conical block 310, the conical block 310 is pushed to move to the left side by the extrusion rods 306 under the extrusion of the conical force.

[0045] A stop tube 308 is fixedly installed on the inner left end of the pressure relief cylinder 301, and a stop block 309 is slidably installed on the inner end of the stop tube 308. A through hole is opened at the inner end of the stop block 309, and the through hole and the stop tube 308 are staggered with each other. The free end of the upstream pipe 11 branches out into a sub-pipe and is connected to the stop tube 308 (not shown in the figure), and the right end of the stop block 309 is fixedly connected to the conical block 310. The stop tube 308 is connected to the pressure relief cylinder 301 through the conducting pipe 304, and the right end of the conducting pipe 304 is located on the right side of the conical pipe 305.

[0046] Example 3: Please refer to Fig.10 , 11 12. A device for detecting the performance of a precision spring. Based on Example 1, the pressure buffer device includes an extrusion sheet 403, which is wound on the outer surface of the stabilizing cylinder 401. A traction rope 402 is fixedly wound on the outer surface of the adjusting knob 5. The free end of the traction rope 402 is fixedly connected to any end of the extrusion sheet 403, and the other end of the extrusion sheet 403 is fixedly connected to the stabilizing cylinder 401. Specifically, a thread pick-up hook is fixedly installed on the inner end of the stabilizing surface shell 4. The thread pick-up hook hooks up the traction rope 402, thereby changing the force direction of the traction rope 402. More specifically, the adjusting knob 5 is connected to the stabilizing surface shell 4 through a ratchet device. The ratchet device enables the adjusting knob 5 to lock the position and maintain the load through the interlocking of its gear and ratchet after rotating a certain angle. It is an existing mature device and will not be described in detail here.

[0047] like Figure 4 , 8As shown in 12, a resistance tube 404 is fixedly installed at the inner end of the stabilizing cylinder 401, a movable sleeve 413 is slidably installed at the inner end of the resistance tube 404, a telescopic tube 406 is fixedly installed at the bottom end of the movable sleeve 413, and the output end of the upstream pipe 11 is fixedly connected to the bottom end of the telescopic tube 406, a return pipe 302 is fixedly connected to the bottom end of the pressure relief cylinder 301, and the return pipe 302 corresponds to the on-off pipe 308, a guide rod 405 is fixedly installed at the inner end of the resistance tube 404, a free end of the return pipe 302 is fixedly connected to the upper end of the guide rod 405, a guide hole 411 is opened on the outer surface of the guide rod 405, the guide hole 411 is located above the guide rod 405, and the inside of the guide hole 411 is connected to the return pipe 302, a one-way valve is installed between the return pipe 302 and the guide rod 405, more specifically, the return pipe 302 and the pressure relief pipe 303 are both pressure-resistant hoses;

[0048] The movable sleeve 413 is sleeved on the outer surface of the guide rod 405. Specifically, a rectangular block is fixedly installed on the inner end of the movable sleeve 413. A rectangular groove is provided on the outer surface of the guide rod 405. The rectangular block is located in the rectangular groove, so as to prevent the movable sleeve 413 from rotating when it moves up and down on the outer surface of the guide rod 405. A through hole 407 is provided at one end of the movable sleeve 413 close to the guide rod 405. When the movable sleeve 413 moves to the uppermost side of the outer surface of the guide rod 405, the through hole 407 corresponds to the guide hole 411.

[0049] like Fig.12 , 13 In order to enable the movable sleeve 413 to generate a certain resistance during its upward movement, a plurality of guide cylinders 410 are fixedly installed on the outer surface of the resistance tube 404. The guide cylinders 410 are arranged in a ring shape. Abutment balls 409 are slidably installed on the inner ends of the guide cylinders 410. A limiting ring is fixedly installed on the inner ends of the guide cylinders 410 to prevent the abutment balls 409 from escaping from the guide cylinders 410. Abutment sheets 408 are arranged on the side of the guide cylinders 410 away from the resistance tube 404, and the abutment sheets 408 and the abutment balls 409 are in contact with each other. The ends of the abutment sheet 408 away from the guide cylinder 410 are in contact with the inner wall of the extrusion sheet 403. The radius of the extrusion sheet 403 is reduced by pulling the extrusion sheet 403. Then, the extrusion sheet 403 starts to compress the resistance spring 412, so that the compression space becomes smaller. Then, the space for the abutment ball 409 to move to the right side also becomes smaller. Then, a greater force is required to push the abutment ball 409 into the guide cylinder 410. In this way, the resistance to the upward movement of the movable sleeve 413 is changed.

[0050] Specifically, the upper corners of the movable sleeve 413 are rounded, so that when it contacts the outer surface of the abutting ball 409 , it can be squeezed and pushed into the guide tube 410 more easily.

[0051] The working principle of the present invention is:

[0052] When in use, the two ends of the spring to be tested are hung on the upper and lower hooks 6, and then the adjusting knob 5 is turned to make it rotate. Then, under the rotation of the adjusting knob 5, the extrusion sheet 403 is pulled by the traction rope 402 to start contracting, and the resistance spring 412 is compressed by the abutment sheet 408. The output end of the hydraulic press starts to output hydraulic oil and transmits it to the upstream pipe 11 and the downstream pipe 13 respectively through the pressure pipe 12. The hydraulic oil flowing into the downstream pipe 13 starts to squeeze the bottom sheet 103 so that the movable rod 102 and the hook 6 move downward, thereby realizing the tensile test of the spring.

[0053] At the same time, the hydraulic oil flowing out of the upstream pipe 11 begins to push the movable sleeve 413 to move upward. Then, under the mutual squeezing with the abutting ball 409, the movable sleeve 413 is blocked in the process of moving upward. Then, the output end of the hydraulic press needs to slowly output a larger pressure to enable the movable sleeve 413 to continue to move upward. Under the synergistic effect of the internal hydraulic pressure of the upstream pipe 11 and the downstream pipe 13, the downward moving force of the movable rod 102 also becomes larger. During the stretching process of the spring, the movable tube 201 also begins to move downward and compresses the return spring 209. Then, the upper end of the central tube 205 contacts the inner upper end of the movable tube 201. If the tested spring has defects, during the tensile test, the elastic limit is exceeded, causing the spring to enter the plastic deformation stage and cannot restore its original shape. At this time, the tested spring no longer has elastic characteristics. Under the action of elastic force, the return spring 209 quickly pushes the movable tube 201 upward, and pushes the movable tube 201 upward through the free tube 214. The gravity rod 206 remains stationary under the action of inertia.

[0054] Then the airbag 210 also moves upward, and the upper end contacts the abutment rod 212. Under the interaction of forces, the airbag 210 begins to expand. Then, under the limitation of the internal space of the free tube 214, the triangular block 213 is pushed to move upward. At this time, the block 211 begins to move in the direction away from the abutment rod 212 and is stuck in the bayonet 208. Then, under the elastic action of the airbag 210, the gravity rod 206 is pushed upward in the opposite direction. At this time, the push plug 207 moves upward and begins to squeeze the internal hydraulic oil. Then the hydraulic oil pushes the stabilizer bar 312 to move. Then, when the assisting plate 307 moves in the direction of the conical block 310, under the squeezing of the conical force, the conical block 310 is pushed to the left through the squeezing rod 306. Then, the through hole on the outer surface of the on-off block 309 is connected with the on-off tube 308. Then, the hydraulic oil flowing out of the upstream pipe 11 flows into the on-off tube 308 through the auxiliary pipe. Then, it enters the upper casing 204 through the pressure relief pipe 303. When the pressure sensor senses that the pressure inside the upper casing 204 increases, it sends an electrical signal to the control device inside the hydraulic press, so that the control device inside the hydraulic press can stop the hydraulic press in time, and then stop the tensile test, avoiding wasting time on invalid tests.

[0055] On the contrary, when the tested spring is qualified, the movable sleeve 413 will continue to move upward until the conducting hole 407 and the guide hole 411 are connected to each other, and then the hydraulic oil flows into the pressure relief cylinder 301 through the return pipe 302 and the conducting pipe 304, and then begins to squeeze the conical block 310 and the on-off block 309 to move, and then the hydraulic press stops again, which means that the current spring performance test is completed.

[0056] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical scheme and inventive concept of the present invention within the technical scope disclosed in the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A device for detecting the performance of a precision spring, comprising a base (1), characterized in that: A stabilizing frame (2) is fixedly mounted on the right end of the base (1); a movable frame (3) is slidably mounted on the end of the stabilizing frame (2) away from the base (1); a stabilizing surface shell (4) is fixedly mounted on the upper end of the base (1), and the stabilizing surface shell (4) is located above the movable frame (3); a movable tube (201) is arranged at the end of the stabilizing surface shell (4) close to the movable frame (3); a compression cylinder (101) is fixedly mounted on the end of the movable frame (3) away from the stabilizing surface shell (4), and a movable rod (102) is slidably mounted on the inner end of the compression cylinder (101); the movable rod (102) and the movable tube (201) are slidably mounted on the inner end of the compression cylinder (101); 201) are fixedly mounted with a hook (6) for hooking a spring at one end close to each other, a stabilizing sleeve (202) is fixedly mounted on the inner bottom end of the stabilizing surface shell (4), the stabilizing sleeve (202) is sleeved on the outer surface of the movable tube (201), an adjusting knob (5) is rotatably mounted on the left end of the stabilizing surface shell (4), a stabilizing cylinder (401) is fixedly mounted on the inner bottom end of the stabilizing surface shell (4), a pressure buffer device for outputting tensile pressure is arranged inside the stabilizing cylinder (401), and an interruption device for preventing the spring from continuing to stretch when the elastic limit of the spring is exceeded is arranged inside the movable tube (201); The interruption device comprises a central tube (205), the central tube (205) being located inside the movable tube (201), the outer surface of the movable tube (201) being provided with two rectangular holes, the outer surface of the central tube (205) being fixedly mounted with two connection blocks (104), and the connection blocks (104) being fixedly connected to the stabilizing surface shell (4) after passing through the rectangular holes, the upper end of the movable tube (201) being fixedly mounted with a central tube (203), the interior of the central tube (203) being penetrated with a gravity rod (206), and the bottom end of the gravity rod (206) being penetrated inside the central tube (205); The pressure buffer device comprises an extrusion sheet (403), the extrusion sheet (403) is wound on the outer surface of the stabilizing cylinder (401), a traction rope (402) is fixedly wound on the outer surface of the adjusting knob (5), the free end of the traction rope (402) is fixedly connected to any end of the extrusion sheet (403), a resistance tube (404) is fixedly installed on the inner end of the stabilizing cylinder (401), a movable sleeve (413) is slidably installed on the inner end of the resistance tube (404), and a telescopic tube (406) is fixedly installed on the bottom end of the movable sleeve (413).

2. The device for detecting the performance of a precision spring according to claim 1, characterized in that: A pressure tube (12) is provided at the upper end of the stabilizing frame (2); an end of the pressure tube (12) close to the stabilizing surface shell (4) is fixedly connected to an upstream tube (11); a free end of the upstream tube (11) is passed through the interior of the stabilizing surface shell (4); and an end of the upstream tube (11) close to the pressure tube (12) is fixedly connected to a downstream tube (13); the free end of the downstream tube (13) is fixedly connected to the compression cylinder (101); a bottom plate (103) is fixedly mounted at the bottom end of the movable rod (102); and an outer surface of the bottom plate (103) is tightly fitted to the interior of the compression cylinder (101).

3. The device for detecting the performance of a precision spring according to claim 1, characterized in that: A free tube (214) is fixedly mounted on the inner upper end of the movable tube (201), and the bottom end of the free tube (214) is inserted into the interior of the central tube (205). The free tube (214) and the central tube (205) are connected via a return spring (209). An air bag (210) is fixedly mounted on the inner end of the free tube (214), and an abutment rod (212) is fixedly mounted on one end of the gravity rod (206) close to the air bag (210).

4. The device for detecting the performance of a precision spring according to claim 3, characterized in that: The outer surface of the free tube (214) is provided with a plurality of clamping blocks (211), the outer surface of the central tube (205) is provided with a plurality of clamping ports (208), the clamping ports (208) corresponding to the clamping blocks (211), the clamping blocks (211) being inserted into the clamping ports (208) after moving in a direction away from the free tube (214), and the upper end of the airbag (210) is fixedly provided with a plurality of triangular blocks (213), the triangular blocks (213) corresponding to the clamping blocks (211).

5. The device for detecting the performance of a precision spring according to claim 4, characterized in that: A push plug (207) is fixedly mounted on the outer surface of the gravity rod (206), and the push plug (207) is located inside the central tube (203). An upper sleeve (204) is fixedly mounted on the inner upper end of the stabilizing surface shell (4), and the upper sleeve (204) is sleeved on the outer surface of the central tube (203).

6. The device for detecting the performance of a precision spring according to claim 5, characterized in that: The left end of the central tube (203) is fixedly connected to a pressure relief cylinder (301), the outer surface of the central tube (203) is fixedly connected to a liquid outlet pipe (215), the liquid outlet pipe (215) is arranged inside the pressure relief cylinder (301), a tapered tube (305) is fixedly installed on the inner end of the pressure relief cylinder (301), the tapered tube (305) is located on the left side of the liquid outlet pipe (215), and the end of the pressure relief cylinder (301) away from the central tube (203) is fixedly connected to the pressure relief pipe (303), the free end of the pressure relief pipe (303) is communicated with the upper sleeve (204), the bottom end of the pressure relief cylinder (301) is fixedly connected to a return pipe (302), the return pipe (302) corresponds to the on-off pipe (308), and the free end of the return pipe (302) is fixedly connected to the upper end of the guide rod (405).

7. The device for detecting the performance of a precision spring according to claim 6, characterized in that: A conical block (310) is passed through the inner end of the conical tube (305), a stabilizing rod (312) is slidably connected to the inner end of the liquid outlet tube (215), a power-assisting disc (307) is fixedly mounted on one end of the stabilizing rod (312) away from the liquid outlet tube (215), the power-assisting disc (307) corresponds to the conical block (310), and a plurality of extrusion rods (306) are rotatably mounted on one end of the conical block (310) close to the power-assisting disc (307), and the right end of the extrusion rod (306) is located in the power-assisting disc (307), a switch tube (308) is fixedly mounted on the inner left end of the pressure relief cylinder (301), and a switch block (309) is slidably mounted on the inner end of the switch tube (308).

8. The device for detecting the performance of a precision spring according to claim 1, characterized in that: A guide rod (405) is fixedly mounted on the inner end of the resistance tube (404); a flow guide hole (411) is provided on the outer surface of the guide rod (405); the movable sleeve (413) is sleeved on the outer surface of the guide rod (405); a conducting hole (407) is provided on one end of the movable sleeve (413) close to the guide rod (405); when the movable sleeve (413) moves to the uppermost side of the outer surface of the guide rod (405), the conducting hole (407) corresponds to the flow guide hole (411); and the resistance tube (404) is ) is fixedly mounted on the outer surface of the guide tube (404), wherein the guide tubes (410) are arranged in a ring shape, and abutment balls (409) are slidably mounted on the inner ends of the guide tubes (410). Abutment sheets (408) are arranged on the side of the guide tubes (410) away from the resistance tube (404), and the abutment sheets (408) and the abutment balls (409) are connected via a resistance spring (412), and the end of the abutment sheet (408) away from the guide tube (410) contacts the inner wall of the extrusion sheet (403).

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