A torsion spring loaded clamp

Abstract

The application discloses a torsion spring loading clamp, which comprises a base, a fixed end assembly, a slider linear guide, a moving end assembly, a boss, a baffle, a limiting boss and a pulling type positioning pin are arranged on the base; the fixed end assembly comprises a fixed seat, a main shaft, a handle, a rotating disc, a spring mounting rod and a pressing block; the moving end assembly comprises a support, a positioning sleeve and a movable pressing block; the baffle sliding on the boss abuts against the middle ring of the spring to provide a reaction force, so that the two ends of the spring are deformed relative to the middle ring; the pulling type positioning pin realizes quick positioning and unlocking of components; the inclined surface of the limiting boss cooperates with the ball head of the positioning pin to realize automatic unlocking; the buffering assembly protects the components; the spring mounting rod, the pressing block and the movable pressing block are provided in multiple specifications to adapt to torsion springs with different inner diameters and lengths; the application reduces the production cost and is safe and stable in the testing process.

Description

Technical Field

[0001] This invention relates to a torsion spring loading clamp. Background Technology

[0002] In the manufacturing process of torsion springs, to ensure that the product quality meets the usage requirements, a special test of its torsional performance is required. The core procedure of this test is as follows: the torsion spring is twisted to a preset angle and then released, and this operation is repeated several times. Finally, the spring is checked to see if any permanent deformation occurs.

[0003] The existing fixture structure used for this test has significant defects and fails to meet the requirements of efficient and universal testing. It employs a design where two bases are fixed to a base plate, with a long pin passing through both bases. A torsion spring is fitted onto the pin, a left-side pressure block is fixed to the base, and a right-side pressure block is connected to the pin. A baffle on the base prevents the spring's central lug from being engaged. This structure presents two major problems in practical applications: First, each test requires inserting the long pin from the left base to the right. Due to the extremely small clearance between the pin and the base, inserting and removing the pin is difficult, resulting in low spring loading and unloading efficiency and severely impacting the testing process. Second, it lacks versatility. Multiple sets of compatible fixtures must be manufactured separately for torsion springs with different inner diameters, increasing production costs, requiring additional storage space, and consuming significant time when changing fixtures, further reducing testing efficiency.

[0004] Therefore, there is an urgent need to design a torsion spring loading fixture that is easy to operate and highly versatile, in order to solve the problems of cumbersome operation and poor adaptability in the existing technology, and to meet the actual needs of small-batch torsion spring testing. Summary of the Invention

[0005] The purpose of this invention is to overcome the shortcomings of existing technologies and provide a torsion spring loading fixture. This fixture enables rapid loading and unloading of springs, improves testing efficiency, and allows for the testing of torsion springs with various inner diameters and lengths by replacing only a few core components, thereby reducing testing costs and ensuring a stable and reliable testing process.

[0006] To achieve the above objectives, the present invention employs the following technical solutions: A torsion spring loading clamp includes a base; A fixed end assembly is connected to one side of the base by screws, and a slider linear guide is connected to the other side of the base by screws. A movable end assembly is slidably disposed on the upper end of the slider linear guide, which is arranged opposite to the fixed end assembly. The movable end assembly cooperates with the fixed end assembly to press the two ends of the torsion spring to be tested respectively. The base is screwed to a boss located between the fixed end assembly and the movable end assembly. A baffle is slidably provided on the upper end of the boss. The baffle is used to press against the middle ear of the torsion spring to be tested and apply a stabilizing reaction force to the middle ear. The base is connected to a limiting boss by screws, and the limiting boss is located between the two linear guide rails of the slider. A set of pull-out positioning pins is installed on the upper end of the moving end component and the baffle respectively. The lower end of the pull-out positioning pin corresponding to the baffle is inserted into the positioning hole of the boss, and the lower end of the pull-out positioning pin corresponding to the moving end component abuts against one side of the limiting boss, thereby realizing the positioning and fastening of the baffle and the moving end component respectively, so as to meet the need for quick replacement of the torsion spring under test.

[0007] In a preferred embodiment, the fixed end assembly includes a fixed base, which is fixedly connected to the left side of the base by screws. A main shaft is rotatably connected to the upper part of the fixed base via a bearing. A handle is fixedly connected to one end of the main shaft, and a turntable is fixedly connected to the other end of the main shaft. A spring mounting rod is connected to the turntable by screws, and a pressure block is connected to the spring mounting rod by screws. A lever is provided on the pressure block for levering one side of the straight steel wire of the torsion spring to be tested.

[0008] In a further preferred embodiment, two limiting cylindrical pins are fixedly provided on the side of the fixed base near the turntable. The limiting cylindrical pins are symmetrically arranged on both sides of the turntable to limit the maximum rotation angle of the turntable.

[0009] As a preferred embodiment, the mobile end component includes a support, which is slidably connected to the linear guide rail of the slider. A positioning sleeve is rotatably connected to the upper part of the support via a bearing. A movable pressure block that rotates synchronously with the positioning sleeve is movably installed inside the positioning sleeve. The movable pressure block is collinear with the axis of the spring mounting rod and is engaged with it. A lever is provided on the movable pressure block for levering the straight steel wire on the other side of the torsion spring to be tested.

[0010] Further preferably, the spring mounting rod, pressure block, and movable pressure block are provided in various specifications, and the total length of the spring mounting rod, pressure block, and movable pressure block after installation is consistent for different specifications; the differences between the different specifications are reflected in the different radial distances from the working parts of the pressure block and the movable pressure block to the outer side of the spring mounting rod, and the different axial lengths of the area on the spring mounting rod where the torsion spring to be tested is fitted, so as to adapt to torsion springs with different inner diameters and different lengths.

[0011] As a preferred embodiment, two sets of pull-out positioning pins are provided, respectively installed on the upper ends of the support and the baffle; each set of pull-out positioning pins includes a mounting base, on which a positioning pin is slidably mounted; the positioning pin of one set of pull-out positioning pins passes through the lower end of the support and abuts against one side of the limiting boss, while the positioning pin of the other set of pull-out positioning pins passes through the lower end of the baffle and inserts into the positioning hole of the boss; a step is provided in the middle of the positioning pin, and a compression spring located inside the mounting base is sleeved on the upper end of the step; the lower end of the compression spring abuts against the step, and the upper end abuts against the inner wall of the mounting base; a handle is fixedly connected to one end of the positioning pin that passes through the upper end of the mounting base.

[0012] In a further preferred embodiment, the side of the limiting boss away from the fixed end assembly is provided as an inclined surface, and the lower end of the positioning pin is provided as a ball head structure.

[0013] As a preferred embodiment, a buffer assembly is provided between the base and the movable end assembly; one end of the buffer seat abuts against the side wall of the buffer seat, the other end of the buffer spring abuts against the movable block, the other end of the buffer spring is fixedly connected to the movable block, and a cylindrical pin is fastened to the middle of the movable block, the end of the cylindrical pin extending out of the buffer seat can abut against the support.

[0014] The present invention has the following beneficial effects I. Significantly Improved Ease of Operation: This invention achieves smooth sliding of the mobile component through a slider linear guide, combined with a quick positioning and unlocking structure of a pull-out positioning pin, and automatic unlocking through the cooperation of the inclined surface of the limiting boss and the ball head of the positioning pin. Unlike existing technologies, there is no need to insert and remove long pins, which greatly simplifies the spring loading and unloading process, reduces the difficulty of operation, and improves testing efficiency by more than 30%.

[0015] II. High versatility and wide applicability: By designing spring mounting rods, pressure blocks, and movable pressure blocks of various specifications, and ensuring that the total length of different specifications of components is consistent after installation, only the above components need to be replaced to adapt to torsion springs of different inner diameters and lengths for testing. There is no need to produce multiple sets of fixtures, which reduces production costs and storage space occupancy.

[0016] III. High Stability and Safety in Testing: Limiting cylindrical pins restrict the rotation angle of the turntable, preventing damage to the spring due to excessive torsion; buffer components prevent rigid collisions between the moving end component and the fixed end component, protecting the fixture components and the spring structure; the baffle is stably positioned by a pull-out positioning pin, ensuring a constant reaction force on the spring's central lug, preventing spring displacement during testing, and ensuring the accuracy of test results.

[0017] IV. Suitable for small-batch testing scenarios: This invention is a manual process equipment with a simple structure, low manufacturing cost, and flexible operation. It does not require a complex electrical control system and can flexibly adjust the torsion angle (0°-150°) and the number of reciprocations (1-10 times) according to the testing requirements. It is very suitable for the testing needs of small batches (1-20 pieces per test) of torsion springs and has strong practicality. Attached Figure Description

[0018] Figure 1 This is a front view of a torsion spring loading fixture.

[0019] Figure 2 A left view of a torsion spring loading clamp and Figure 1 View A in the diagram.

[0020] Figure 3 This is a structural diagram of the fixed end assembly of a torsion spring loading clamp.

[0021] Figure 4 yes Figure 3 A side view of section AA.

[0022] Figure 5 This is a structural diagram of the moving end component of a torsion spring loading clamp.

[0023] Figure 6 This is a diagram of a pull-out locating pin structure for a torsion spring loading clamp.

[0024] Figure 7 This is a structural diagram of a buffer assembly for a torsion spring-loaded clamp.

[0025] Figure 8 This is a structural diagram of the torsion spring to be tested.

[0026] In the diagram: 1-base, 2-fixed end assembly, 21-fixed seat, 22-spindle, 23-handle, 24-turntable, 25-spring mounting rod, 26-pressure block, 27-limiting cylindrical pin, 3-slider linear guide, 4-moving end assembly, 41-support, 42-positioning sleeve, 43-movable pressure block, 5-bore, 6-baffle, limiting boss, 7-pull-out positioning pin, 8-81-mounting seat, 82-positioning pin, 83-compression spring, 84-handle bar, 9-buffer assembly, 91-buffer seat, 92-compression spring, 93-moving block, 94-cylindrical pin, 10-torsion spring to be tested. Detailed Implementation

[0027] The present invention will now be described in detail with reference to the accompanying drawings.

[0028] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the invention.

[0029] Example: A torsion spring loading clamp includes a base 1; A fixed end assembly 2 is connected to one side of the base 1 by screws, and a slider linear guide rail 3 is connected to the other side of the base 1 by screws. A movable end assembly 4 is slidably arranged on the upper end of the slider linear guide rail 3, which is opposite to the fixed end assembly 2. The movable end assembly 4 cooperates with the fixed end assembly 2 to press the two ends of the torsion spring to be tested respectively. The rear of the base 1 is screwed to a boss 5 located between the fixed end assembly 2 and the moving end assembly 4. A baffle 6 is slidably provided on the upper end of the boss 5. The baffle 6 is used to press against the middle ear of the torsion spring to be tested. By applying a stable reaction force to the middle ear, the two ends of the torsion spring to be tested can undergo torsional deformation relative to the middle ear. The base 1 is connected to the limiting boss 7 by screws, and the limiting boss 7 is located between the two slider linear guide rails 3. The upper ends of the moving end component 4 and the baffle 6 are respectively equipped with a set of pull-out positioning pins 8. The baffle 6 achieves positioning and fastening by inserting the corresponding pull-out positioning pin 8 into the positioning hole of the boss 5. The moving end component achieves positioning and fastening by abutting the corresponding pull-out positioning pin 8 against one side of the limiting boss 7, thereby meeting the need for quick replacement of the torsion spring under test.

[0030] The fixed end assembly 2 includes a fixed base 21, which is fixedly connected to the left side of the base 1 by screws. The upper part of the fixed base 21 is rotatably connected to a main shaft 22 via a bearing. One end of the main shaft 22 is fixedly connected to a handle 23, which allows the operator to drive the main shaft to rotate by turning the handle. The other end of the main shaft 22 is fixedly connected to a turntable 24. The turntable 24 is connected to a spring mounting rod 25 by screws. The spring mounting rod 25 is connected to a pressure block 26 by screws. The pressure block 26 is provided with a lever, which is used to move one side of the straight steel wire of the torsion spring to be tested, so as to cause the spring end to undergo torsional deformation relative to the middle ear.

[0031] Two limiting cylindrical pins 27 are fixedly installed on the side of the fixed base 21 near the turntable 24. The limiting cylindrical pins 27 are symmetrically arranged on both sides of the turntable 24 to limit the maximum rotation angle of the turntable 24, so as to prevent the torsion spring under test from being damaged due to excessive torsional deformation of the two ends relative to the middle ear ring, and to ensure the safety of the test process and the test accuracy of the spring.

[0032] The mobile end component 4 includes a support 41, which is slidably connected to the linear guide rail 3 of the slider. It can move closer to or further away from the fixed end component 2 along the guide rail direction to realize the loading and unloading of the spring and the adjustment of the test position. The upper part of the support 41 is rotatably connected to the positioning sleeve 42 through the bearing. The positioning sleeve 42 is movably installed with a movable pressure block 43 that rotates synchronously with it. The movable pressure block 43 is collinear with the axis of the spring mounting rod 25 and is engaged to ensure that the two ends of the spring are subjected to balanced force. The movable pressure block 43 is provided with a lever to move the straight steel wire on the other side of the torsion spring to be tested. Together with the fixed end component 2, it drives the two ends of the spring to undergo synchronous torsional deformation relative to the middle ear.

[0033] The spring mounting rod 25, pressure block 26, and movable pressure block 43 are available in various specifications. The total length of the spring mounting rod 25, pressure block 26, and movable pressure block 43 remains consistent after installation, ensuring that the axis of the movable pressure block 43 and the spring mounting rod 25 remains collinear after component replacement, without the need to adjust other structures. The differences between the specifications are reflected in the different radial distances from the working parts of the pressure block 26 and the movable pressure block 43 to the outer side of the spring mounting rod 25, as well as the different axial lengths of the area on the spring mounting rod 25 where the torsion spring to be tested is fitted. By replacing the above-mentioned components with different specifications, it is possible to adapt to the testing of torsion springs with different inner diameters and lengths, greatly improving the versatility of the fixture.

[0034] Two sets of pull-out positioning pins 8 are provided, respectively installed on the upper ends of the support 41 and the baffle 6. Each set of pull-out positioning pins 8 includes a mounting base 81, which is fixedly installed on the support 41 or the baffle 6. A positioning pin 82 is slidably disposed inside the mounting base 81. The positioning pin 82 of one set of pull-out positioning pins 8 passes through the lower end of the support 41 and abuts against one side of the limiting boss 7. The positioning pin 82 of the other set of pull-out positioning pins 8 passes through the lower end of the baffle 6 and inserts into the positioning hole of the boss 5, thereby positioning the support 41 or the baffle 6. A step is provided in the middle of the positioning pin 82, and the upper end of the step... A compression spring 83 is fitted inside the mounting base 81. The lower end of the compression spring 83 abuts against the step, and the upper end abuts against the inner wall of the mounting base 81, providing a downward restoring force for the positioning pin 82. The end of the positioning pin 82 that passes through the upper end of the mounting base 81 is fixedly connected to a handle 84. By pulling the handle 84, the operator can drive the positioning pin 82 to slide upward, disengage from the positioning hole, and release the positioning state. When the positioning pin 82 positions the baffle 6, it can ensure that the reaction force of the baffle 6 on the spring middle lug is stable, avoid the baffle 6 from shifting during deformation, and ensure the stability of the test.

[0035] The side of the limiting boss 7 away from the fixed end component 2 is set as an inclined surface, and the lower end of the positioning pin 82 is set as a ball head structure. When the moving end component 4 slides to the left, the support 41 drives the pull-out positioning pin 8 to move synchronously. The ball head of the positioning pin 82 contacts the inclined surface of the limiting boss 7. As the moving end component 4 continues to slide, the inclined surface generates an upward force on the ball head, lifting the positioning pin 82 in the mounting base 81 upward, so that the positioning pin 82 automatically disengages from the positioning hole without the need for manual pulling of the handle bar 84, further improving the ease of operation.

[0036] A buffer assembly 9 is provided between the base 1 and the moving end assembly 4. The buffer assembly 9 includes a buffer seat 91, which is fixedly connected to the base 1 by screws. One end of a buffer spring 92 abuts against the side wall of the buffer seat 91, and the other end of the buffer spring 92 abuts against a moving block 93. A cylindrical pin 94 is fastened to the middle of the moving block 93. One end of the cylindrical pin 94 extends out of the buffer seat 91. When the moving end assembly 4 moves one end of the spring closer to the middle ear to adjust the initial position of deformation, the extended end of the cylindrical pin 94 can abut against the support 41. Through the elastic action of the buffer spring 92, a buffering force is generated for the sliding of the moving end assembly 4, avoiding rigid impact to the support 41, protecting the spring mounting rod 25 and the spring structure, and extending the service life of the clamp.

[0037] It should also be noted that the torsion spring to be tested mentioned in this invention has a shape and structure with straight steel wires at both ends and a central loop (such as...) in the middle. Figure 8 (As shown).

[0038] Fixture assembly steps Base and base component installation: Place base 1 on a horizontal test platform to ensure that base 1 is stable and does not wobble; install the fixing seat 21 of fixing end component 2 into the preset mounting hole position on the left side of base 1 with screws, and tighten with a torque wrench to ensure that fixing seat 21 is firmly installed and not loose.

[0039] Installation of guide rails and moving end components: Place the two slider linear guide rails 3 parallel to each other at the preset position on the right side of the base 1 and fix them together with screws. Use a level to calibrate the flatness of the guide rails to ensure that the sliding surface of the guide rails is horizontal. Install the support 41 of the moving end component 4 on the slider of the slider linear guide rail 3. Push the support 41 to test whether the sliding is smooth. If there is any jamming, check the installation accuracy of the guide rails or add grease. Then install the positioning sleeve 42 in the bearing hole at the top of the support 41 through a deep groove ball bearing to ensure that the positioning sleeve 42 rotates flexibly. Then insert the movable pressure block 43 into the positioning sleeve 42 and fix it with a set screw to ensure that the movable pressure block 43 and the positioning sleeve 42 rotate synchronously.

[0040] Boss and baffle installation: Install the boss 5 at the preset position at the rear of the base 1 with screws, ensuring that the upper surface of the boss 5 is horizontal; place the baffle 6 in the groove on the upper surface of the boss 5, push the baffle 6 to test whether the sliding is smooth, and then install the pull-out positioning pin 8 at the preset hole at the upper end of the baffle 6, adjust the position of the positioning pin 82 to ensure that the lower end of the positioning pin 82 can be inserted into the positioning hole on the boss 5.

[0041] Installation of limiting boss and buffer assembly: Install the limiting boss 7 on the base 1 at the preset position between the two slider linear guide rails 3 with screws, ensuring that the inclined surface of the limiting boss 7 faces the moving end assembly 4; install the buffer seat 91 of the buffer assembly 9 on the base 1 near the moving end assembly 4 with screws, install the buffer spring 92 and the moving block 93 in sequence inside the buffer seat 91, pass the cylindrical pin 94 through the hole in the middle of the moving block 93 and tighten it with a nut, ensuring that the end of the cylindrical pin 94 extending out of the buffer seat 91 can abut against the side of the support 41.

[0042] Detailed installation of the fixed end assembly: The spindle 22 is installed in the bearing hole on the upper part of the fixed seat 21 through a tapered roller bearing to ensure that the spindle 22 rotates flexibly; the handle 23 is connected to one end of the spindle 22 through a flat key and tightened with a nut; the turntable 24 is connected to the other end of the spindle 22 through a flat key and tightened with a nut; according to the specifications of the spring to be tested, a suitable spring mounting rod 25 is selected and installed on the turntable 24 with screws, and then the corresponding pressure block 26 is installed on the spring mounting rod 25 with screws, ensuring that the lever on the pressure block 26 faces the spring installation direction.

[0043] Spring testing procedure Preparation before testing: Based on the inner diameter and length of the torsion spring to be tested, select the appropriate specifications of the spring mounting rod 25, pressure block 26 and movable pressure block 43 (matching the specifications of pressure block 26), replace the corresponding parts on the fixed end assembly 2 and the movable end assembly 4, and ensure that each part is installed firmly and that the movable pressure block 43 is collinear with the axis of the spring mounting rod 25.

[0044] Spring clamping: Pull the handle bar 84 on the baffle 6 to drive the positioning pin 82 to slide upward and disengage from the positioning hole on the boss 5, thus releasing the positioning of the baffle 6; slide the baffle 6 to a position that matches the middle earring of the spring to be tested, release the handle bar 84, and the positioning pin 82 will be inserted into the positioning hole of the boss 5 under the action of the compression spring 83, thus achieving the positioning of the baffle 6.

[0045] Pull the handle bar 84 on the support 41 to drive the positioning pin 82 to slide upward and release the positioning of the support 41; slide the support 41 to the left along the linear guide rail 3 of the slider to the maximum stroke, put the torsion spring to be tested on the spring mounting rod 25, so that the middle ear of the spring abuts against the side of the baffle 6, and the straight steel wire at one end of the spring is in contact with the lever on the pressure block 26.

[0046] Push the support 41 to slide to the right until the movable pressure block 43 engages with the left end of the spring mounting rod 25, and the lever on the movable pressure block 43 is in contact with the straight steel wire at the other end of the spring. At this time, the positioning pin 82 on the support 41 is inserted into the positioning hole of the base 1 under the action of the compressed spring 83, thereby positioning the support 41 and completing the spring clamping.

[0047] Torsion test procedure: The operator holds the handle 23 with both hands and rotates the handle clockwise, causing the main shaft 22, turntable 24, spring mounting rod 25 and pressure block 26 to rotate synchronously. The lever of pressure block 26 causes one end of the spring straight wire to rotate, and the other end of the spring straight wire drives the positioning sleeve 42 to rotate synchronously through the movable pressure block 43 until the side of the turntable 24 abuts against the limiting cylindrical pin 27. At this time, the spring torsion angle reaches the preset value (0°-150°). Maintain this angle for 5 seconds and observe whether the spring shows any immediate deformation.

[0048] Turn handle 23 counterclockwise to release the spring until it returns to its initial state, completing one twisting operation; repeat the above twisting and releasing operation 5 times (adjust the number of times according to test requirements), and observe the state of the spring after each operation.

[0049] Spring disassembly and inspection: After the test is completed, pull the handle bar 84 on the support 41 to slide the support 41 to the left along the linear guide rail 3 of the slider. When the ball head of the positioning pin 82 contacts the inclined surface of the limiting boss 7, continue to slide the support 41. The positioning pin 82 will automatically rise upward under the action of the inclined surface and disengage from the positioning hole. There is no need to continue pulling the handle bar 84. Slide the support 41 to the maximum stroke and remove the torsion spring to be tested.

[0050] Check whether the spring has undergone permanent deformation (such as changes in free length or angular deviation). If the spring has no obvious deformation, the test is considered to be qualified; if deformation occurs, the test is considered to be unqualified. Record the test results. If you need to test another spring of the same specification, repeat the above clamping and testing process; if you need to test springs of different specifications, replace the appropriate spring mounting rod 25, pressure block 26 and movable pressure block 43 before clamping and testing.

[0051] In this embodiment, the torsion spring can be installed and disassembled quickly, and different specifications of torsion springs can be loaded and tested by replacing the spring mounting rod 25, the pressure block 26 and the movable pressure block 43.

[0052] This invention is not limited to the specific embodiments described above. The invention extends to any new feature or combination disclosed in this specification, as well as any new method or process step or combination disclosed herein.

Claims

1. A torsion spring loading clamp, characterized in that: Including the base; A fixed end assembly is connected to one side of the base by screws, and a slider linear guide is connected to the other side of the base by screws. A movable end assembly is slidably disposed on the upper end of the slider linear guide, which is arranged opposite to the fixed end assembly. The movable end assembly cooperates with the fixed end assembly to press the two ends of the torsion spring to be tested respectively. The base is screwed to a boss located between the fixed end assembly and the movable end assembly. A baffle is slidably provided on the upper end of the boss. The baffle is used to press against the middle ear of the torsion spring to be tested and apply a stabilizing reaction force to the middle ear. The base is connected to a limiting boss by screws, and the limiting boss is located between the two linear guide rails of the slider. A set of pull-out positioning pins is installed on the upper end of the moving end component and the baffle respectively. The lower end of the pull-out positioning pin corresponding to the baffle is inserted into the positioning hole of the boss, and the lower end of the pull-out positioning pin corresponding to the moving end component abuts against one side of the limiting boss, thereby realizing the positioning and fastening of the baffle and the moving end component respectively, so as to meet the need for quick replacement of the torsion spring under test. The fixed end assembly includes a fixed base, which is fixedly connected to the left side of the base by screws. The upper part of the fixed base is rotatably connected to a main shaft via a bearing. One end of the main shaft is fixedly connected to a handle, and the other end of the main shaft is fixedly connected to a turntable. The turntable is connected to a spring mounting rod by screws, and the spring mounting rod is connected to a pressure block by screws. The pressure block is provided with a lever for moving one side of the straight steel wire of the torsion spring to be tested. The mobile terminal component includes a support, which is slidably connected to the linear guide rail of the slider. A positioning sleeve is rotatably connected to the upper part of the support through a bearing. A movable pressure block that rotates synchronously with the positioning sleeve is movably installed inside the positioning sleeve. The movable pressure block is collinear with the axis of the spring mounting rod and is engaged with it. A lever is provided on the movable pressure block for levering the straight steel wire on the other side of the torsion spring to be tested. The spring mounting rod, pressure block, and movable pressure block are available in various specifications. The total length of the spring mounting rod, pressure block, and movable pressure block after installation remains the same for different specifications. The differences between the different specifications are reflected in the different radial distances from the working parts of the pressure block and the movable pressure block to the outer side of the spring mounting rod, and the different axial lengths of the area on the spring mounting rod where the torsion spring to be tested is fitted, so as to adapt to torsion springs with different inner diameters and different lengths.

2. The torsion spring loading clamp according to claim 1, characterized in that: Two limiting cylindrical pins are fixedly installed on the side of the fixed base near the turntable. The limiting cylindrical pins are symmetrically arranged on both sides of the turntable to limit the maximum rotation angle of the turntable.

3. The torsion spring loading clamp according to claim 1, characterized in that: Two sets of pull-out positioning pins are provided, respectively installed on the upper end of the support and the baffle. Each set of pull-out positioning pins includes a mounting base, on which a positioning pin is slidably mounted. The positioning pin of one set of pull-out positioning pins passes through the lower end of the support and abuts against one side of the limiting boss. The positioning pin of the other set of pull-out positioning pins passes through the lower end of the baffle and inserts into the positioning hole of the boss. A step is provided in the middle of the positioning pin. A compression spring located inside the mounting base is sleeved on the upper end of the step. The lower end of the compression spring abuts against the step, and the upper end abuts against the inner wall of the mounting base. A handle is fixedly connected to one end of the positioning pin that passes through the upper end of the mounting base.

4. The torsion spring loading clamp according to claim 1, characterized in that: The side of the limiting boss away from the fixed end assembly is set as an inclined surface, and the lower end of the positioning pin is set as a ball head structure.

5. The torsion spring loading clamp according to claim 1, characterized in that: A buffer assembly is provided between the base and the mobile end assembly; the buffer assembly includes a buffer seat connected to the base by screws, one end of a buffer spring abuts against the side wall of the buffer seat, the other end of the buffer spring abuts against a moving block, and a cylindrical pin is fastened to the middle of the moving block, the end of the cylindrical pin extending out of the buffer seat can abut against the support.

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