A spring pressure testing tool

Abstract

The present invention discloses a spring pressure testing tool, comprising: a frame, which is composed of a base, a column, and a cantilever; a dynamometer, which is located at the end of the cantilever and is used to measure the elastic force value of the spring; a dynamometer preset height locking device, which is used to lock the dynamometer at a preset specific height, that is, the height position corresponding to when the dynamometer compresses the test spring to a test length value L1 or L2; a dynamometer height fine-tuning device, which is located at the junction of the dynamometer and the locking device and is used to finely adjust the height of the dynamometer, that is, to adjust the length of the test spring in a compressed state; a spring support seat, which is used to place the test spring; and a spring length detection device, which is located in the spring support seat and is used to measure the length of the test spring in a compressed state.

Description

Technical Field

[0001] The invention relates to a coil spring test, in particular to a pressure testing tool for a spring. Background Art

[0002] The RF connector BMA-KFB2 product needs to be equipped with a spring, such as Figure 1 As shown, this spring is 13.8mm long. The design requires that the spring pressure be greater than or equal to 17N when compressed to 8mm, and less than or equal to 28N when compressed to 6mm. Therefore, a tooling must be designed to test the pressure when the spring is compressed to the specified distance to meet production requirements. Summary of the Invention

[0003] The purpose of this invention is to design a fixture that can test the pressure of a spring when it is compressed to a specified distance. This fixture combines a dynamometer with a digital indicator. The digital indicator measures the compressed length of the spring. The spring to be tested is inserted into a lower test head. During the test compression process, the lower test head moves downward as the spring is compressed, thereby measuring the compression value of the spring to be tested. The dynamometer then measures the pressure when the spring is compressed to the specified distance, thus meeting the above test requirements.

[0004] The technical solution of the present invention is:

[0005] A spring pressure testing tool, comprising:

[0006] -Frame, consisting of base, columns and cantilever;

[0007] -Dynamometer, arranged at the end of the cantilever, used to measure the elastic force of the spring;

[0008] - The dynamometer has a preset height locking device, which is used to lock the dynamometer at a specific preset height, that is, the height position corresponding to when the dynamometer compresses the test spring to the test length value L1 or L2, which is called the initial position of the dynamometer;

[0009] The dynamometer height fine-adjustment device is arranged at the junction of the dynamometer and its height locking device, and is used to finely adjust the height of the dynamometer, that is, to adjust the length of the test spring in the compressed state;

[0010] Spring support seat, used to place the spring under test;

[0011] The spring length detection device is arranged in the spring support seat and is used to measure the length of the test spring in the compressed state.

[0012] The dynamometer preset height locking device further comprises:

[0013] The dynamometer's lifting mechanism includes a rack shaft that extends through the cantilever and meshes with a gear within the cantilever. The gear shaft is equipped with an operating handle and a torsion return spring. Pulling the handle causes the rack shaft to rise and fall. Upper and lower bearing seats are located at each end of the rack shaft. The dynamometer is connected to a fine-tuning device, which in turn is connected to the upper bearing seat. The dynamometer can rise and fall synchronously with the rack shaft.

[0014] -Dynamometer height setting and self-locking mechanism, including a slip ring sleeved on the rack shaft, the slip ring is located between the upper bearing seat and the cantilever, the matching surface of the rack shaft and the slip ring is provided with an axial guide key, the slip ring is equipped with a set screw, tightening the screw to fix the slip ring on the rack shaft; loosening the screw, the slip ring can slide up and down along the rack shaft; there is a self-locking fixing block on the outer circumference of the slip ring, facing the column of the frame, the self-locking fixing block is a wedge-shaped block, with flat surfaces on the top, bottom, left and right, and a downward inclined front face. Surface; corresponding to the self-locking fixed block, a self-locking mechanism is provided, which includes a clamp fixed on the frame column, a slide integrated with the clamp, a slider and a spring provided in the slide, the spring pushes the slider to extend along the slide, and the slider is also a wedge-shaped block, with flat surfaces on the top, bottom, left and right, and an upward inclined surface on the front end, which is adapted to the lower inclined surface of the self-locking fixed block; a slider reset lever is provided on the slide, which is hinged on the slide. Pushing the lever can make the slider overcome the thrust of the spring and retract into the slide.

[0015] The dynamometer height fine-tuning device includes a vertically arranged screw-nut pair, the screw passes through the upper bearing seat of the rack vertical shaft, the smooth rod section of the screw neck is movably matched with the upper bearing seat, a limit plate is provided on the upper bearing seat, the screw passes through the upper bearing seat and is suspended on the limit plate, an operating knob is provided on the top of the screw, the nut is a square nut, the square nut is fixedly connected to the dynamometer, and when the knob is turned, the screw rotates, causing the square nut to move up and down, driving the dynamometer to rise and fall synchronously.

[0016] The dynamometer includes a mounting plate, the dynamometer is fixed on the mounting plate, the back of the mounting plate is fixedly connected to the square nut, and the back of the mounting plate is also slidably matched with the bottom surfaces of the upper and lower bearing seats of the rack vertical shaft.

[0017] The spring support seat includes a pair of support plates, a table panel, and a spring positioning seat. The support plates are fixed on the frame base, the table panel is overlapped on the top ends of the two support plates, and the spring positioning seat is arranged on the table panel. Spring positioning holes are provided in the centers of the table panel and the spring positioning seat. The spring positioning holes of the table panel and the spring positioning seat are concentric and have the same diameter.

[0018] The spring length detection device is a digital dial indicator, which is arranged in the spring support seat, located below the table panel, and fixed to the bottom surface of the table panel. The head of the digital dial indicator is upward, passing through the center hole of the table panel and the spring positioning seat and protruding from the table surface, serving as the lower test head of the device and also the positioning core shaft of the tested spring.

[0019] The upright column of the frame is a threaded column equipped with a nut. The cantilever is located on the nut. The height of the cantilever can be adjusted by rotating the nut.

[0020] The length of the spring is L, and its performance must be designed to meet the following requirements: when the spring is compressed to a first length L1, the spring pressure N1 is measured; when the spring is compressed to a second length L2, the spring pressure N2 is measured.

[0021] The beneficial effects of the present invention are:

[0022] The present invention combines a dynamometer and a digital dial indicator. Through the cooperation of a locking device and a fine-tuning device, the digital dial indicator is used to measure the length value of the spring in the compressed state, and the dynamometer is used to measure the pressure when the spring is compressed to a specified length, thereby meeting the test requirements.

[0023] The present invention will be described in detail below with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 This is a schematic diagram of spring testing requirements.

[0025] Figure 2 It is a schematic structural diagram of the present invention as a whole.

[0026] Figure 3 It is a structural schematic diagram of the frame of the present invention.

[0027] Figure 4-1 It is a structural schematic diagram of the self-locking mechanism of the present invention (unlocked state).

[0028] Figure 4-2 Schematic diagram of the structure of the self-locking mechanism of the present invention (locked state).

[0029] Figure 4-3 It is a schematic diagram of the internal structure of the self-locking mechanism of the present invention.

[0030] Figure 5-1 It is a structural schematic diagram of the fine-tuning device of the present invention (back).

[0031] Figure 5-2 It is a structural schematic diagram of the fine-tuning device of the present invention (front view).

[0032] Meaning of the codes in the figure:

[0033] 1—Frame; 2—Dynamometer preset height locking device (including self-locking mechanism); 3—Dynamometer fine-tuning device; 4—Dynamometer; 5—Upper test head; 6—Lower test head (i.e., the scale head of the digital dial indicator); 7—Test spring; 8—Spring positioning seat; 9—Tabletop; 10—Support plate; 11—Digital dial indicator; 101—Frame base; 102—Frame threaded column; 103—Cantilever lift (height) adjustment nut; 104—Cantilever; 105—Rack and pinion operating handle; 106—Self-locking mechanism Fixed block; 107—sleeve set screw; 108—sleeve; 109—gear; 110—rack shaft; 201—hoop; 202—lever hinge shaft bolt; 203—hinge shaft nut gasket; 204—lever; 205—slide seat; 206—self-locking slider; 207—self-locking slider return spring; 301—fine-tuning knob; 302—limiting plate of screw nut pair; 303—bearing seat on rack shaft; 304—dynamometer mounting plate; 305—screw nut pair; 306—bearing seat under rack shaft. DETAILED DESCRIPTION

[0034] This spring pressure test fixture, see Figure 2 、 Figure 3 Figure 4 ( Figure 4-1 、 Figure 4-2 、 Figure 4-3 ) and Figure 5 ( Figure 5-1 、 Figure 5-2 ).

[0035] See also Figure 2 The tooling mainly includes a frame 1, a dynamometer preset height locking device 2, a dynamometer height fine-tuning device 3, a dynamometer 4, an upper test head 5, a lower test head 6, a test spring support seat, and a digital dial indicator 11.

[0036] See also Figure 3 The frame 1 is composed of a base 101, a threaded column 102, a cantilever 104, and a cantilever height adjustment nut 103.

[0037] The tested spring support seat consists of a pair of support plates 10, a table panel 9, and a spring locating seat 8. The support plate 10 is fixedly mounted on the base 101, the table panel 9 is overlapped on the top surface of the two support plates 10, and the spring locating seat 8 is arranged on the table panel 9. There are holes in the center of the table panel 9 and the spring locating seat 8, and the two holes are concentric and have the same diameter.

[0038] The digital dial indicator 11 is arranged in the internal space of the spring support seat and fixed on the bottom surface of the table panel 9. The ruler head of the digital dial indicator 11 passes through the table panel 9 and the center hole of the spring positioning seat 8 upward and extends out of the table surface. The ruler head is the lower probe 6 and also serves as the positioning core shaft for placing the test spring 7.

[0039] See also Figure 2 、 Figure 34 and 5, the dynamometer preset height locking device 2 further includes:

[0040] 1) Dynamometer lifting mechanism (see Figure 2 、 Figure 3 5 ), comprises a rack and pinion transmission pair, wherein the rack, or rack shaft 110, extends through the cantilever 104 and meshes with a gear 109 disposed within the cantilever 104. The rotating shaft of gear 109 is equipped with an operating handle 105 and a torsion return spring (not shown). Pulling the handle 105 causes the rack shaft 110 to descend, and the torsion return spring stores energy. Releasing the handle 105 releases the energy, causing the gear 109 to reverse, driving the rack shaft 110 upward. Upper and lower bearing blocks 303 and 306 are provided at each end of the rack shaft 110, respectively. A dynamometer 4 is connected to the fine-tuning device 3, which in turn is connected to the upper bearing block 303 (the specific connection relationship is described in detail below). The dynamometer 4 can rise and fall synchronously with the rack shaft 110.

[0041] 2) Dynamometer height setting and self-locking mechanism (see Figure 3 4 ), comprising a slip ring 108 sleeved on the rack shaft 110, the slip ring 108 is located between the upper bearing seat 303 and the cantilever 104. To prevent the slip ring 108 from rotating, an axial guide key (not shown) is provided on the mating surface of the rack shaft 110 and the slip ring 108. The slip ring 108 is provided with a set screw 107. Tightening the screw 107 fixes the slip ring 108 to the rack shaft 110. Loosening the screw 107 allows the slip ring 108 to slide up and down along the rack shaft 110. A self-locking fixing block 106 is provided on the outer circumference of the slip ring 108, facing the self-locking mechanism (i.e., facing the column 102 of the frame). The self-locking fixing block 106 is a wedge-shaped block that moves up, down, left, and right. They are all flat, with a downwardly inclined front end. A self-locking mechanism is provided corresponding to the self-locking fixed block 106. This self-locking mechanism includes a clamp 201 fixed to the frame column 102, a slide 205 integral with the clamp 201, a self-locking slider 206 and a spring 207 within the slide 205, and the spring 207 pushes the self-locking slider 206 out along the slide 205. The self-locking slider 206 is also a wedge-shaped block, with flat surfaces on the top, bottom, left, and right sides, and an upwardly inclined front end that aligns with the lower inclined surface of the self-locking fixed block 106. A self-locking slider reset lever 204 is provided on the slide 205. This lever 204 is hinged to the slide 205, and the hinge bolt 202 is equipped with a washer 203. Pushing the lever 204 causes the self-locking slider 206 to overcome the thrust of the spring 207 and retract into the slide 205.

[0042] The dynamometer height fine-tuning device 3 (see Figure 5) includes a vertically arranged screw-nut pair 305. The screw of the screw-nut pair 305 passes through the upper bearing seat 303. The smooth rod section of the screw neck is movably matched with the upper bearing seat 303. A limit plate 302 is provided on the upper bearing seat 303. The screw passes through the upper bearing seat 303 and is suspended on the limit plate 302. A fine-tuning knob 301 is provided on the top of the screw. The nut of the screw-nut pair 305 is a square nut, which is fixedly connected to the dynamometer 4. When the knob 301 is rotated, the screw rotates, causing the square nut to move up and down, driving the dynamometer 4 to move up and down synchronously.

[0043] The dynamometer 4 has a mounting plate 304 , which is fixed on the front of the mounting plate 304 . The back of the mounting plate 304 is fixedly connected to the square nut. The back of the mounting plate 304 is also slidably matched with the bottom surfaces of the upper bearing seat 303 and the lower bearing seat 306 .

[0044] The operation process of this tool is as follows:

[0045] Preparation steps:

[0046] 1. According to the specifications and dimensions of the test spring 7, adjust the height of the cantilever 104 so that it meets the height requirements for the test.

[0047] 2. Adjust the nut position of the screw nut pair 305 of the fine-tuning device so that there is enough space for the nut to adjust the lifting stroke up and down.

[0048] 3. When using this tool for the first time, reset the digital dial indicator 11. To do this, first loosen set screw 107 to disable the self-locking mechanism. Then manually rotate handle 105 to lower the dynamometer 4 until the upper test head 5 contacts the lower test head 6 (i.e., the scale head of the digital dial indicator). Continue rotating handle 105 until the upper test head 5 presses the lower test head 6 flush with the surface of the spring locating seat 8, and the upper test head 5 contacts the surface of the spring locating seat 8. Press the reset button on the digital dial indicator 11 to complete the reset operation.

[0049] 4. Preset the initial height of the dynamometer by releasing the handle 105 when the digital dial indicator 11 is cleared. Under the action of the torsion reset spring, the rack shaft 110 rises, driving the dynamometer 4 to rise synchronously. Observe the reading of the digital dial indicator 11. When the reading is close to the test length of the test spring 7 (for example, the test spring is compressed to 8mm in this example), the dynamometer stops rising. Align the self-locking fixing block 106 with the self-locking slider 206 in the locked state (as shown in the figure). Figure 4-2 As shown), tighten the set screw 107 to enter the locked state; at this time, the initial height of the dynamometer is set. Then, turn the lever 204, the self-locking slider 206 retracts, and the unlocking is achieved. The rack shaft 110 drives the dynamometer 4 to continue to rise (as shown). Figure 4-1As shown in the figure), when their gravity is balanced with the elastic force of the torsion return spring, the dynamometer 4 rises to the highest point, which is the initial position of the dynamometer 4 after unlocking. Then the spring test can be officially carried out.

[0050] Spring test operation: Insert the test spring 7 into the lower test head 6 until it seats on the spring positioning seat 8. Turn the handle 105 to press the dynamometer 4 downward until the self-locking mechanism engages. Observe whether the value displayed on the digital dial indicator 11 matches the required spring compression value. If not, rotate the fine-tuning knob 301 in the fine-tuning device 3 until the value displayed on the digital dial indicator 11 matches the required spring compression value (8mm). The test value read from the dynamometer 4 at this point is the pressure value measured when the spring is compressed to the specified length. After the test is completed, manually unlock the lever 204, and the dynamometer 4 automatically returns to its initial position, completing the pressure test for one compressed length (8mm).

[0051] If you want to test the pressure of another compression length (6mm), reset the initial height of the dynamometer according to step 4. The remaining steps are the same and will not be repeated here.

[0052] The above embodiments are for illustrating the present invention, but not for limiting the present invention. According to the principle and structure of the present invention, it is not difficult to see that the tool is also applicable to measuring springs of other specifications.

Claims

1. A spring pressure testing tool, characterized in that: The tooling includes: -Frame, consisting of base, columns and cantilever; - A dynamometer, arranged at the end of the cantilever through a dynamometer preset height locking device, used to measure the elastic force value of the spring; - The dynamometer has a preset height locking device, which is used to lock the dynamometer at a preset specific height. That is, the dynamometer compresses the test spring to the height position corresponding to the test length value L1 or L2, which is called the initial position of the dynamometer; -Dynamometer height fine-adjustment device, arranged at the junction of the dynamometer and the dynamometer preset height locking device, used to finely adjust the height of the dynamometer, that is, adjust the length of the test spring in the compressed state; - Spring support seat, used to place the spring under test; - a spring length detection device, which is a digital indicator arranged in the spring support seat and is used to measure the length of the test spring in a compressed state; The dynamometer preset height locking device further comprises: The dynamometer lifting mechanism includes a rack shaft that extends through the cantilever and meshes with a gear arranged within the cantilever. The gear shaft is equipped with an operating handle and a torsion return spring. Pulling the handle causes the rack shaft to rise and fall. Upper and lower bearing seats are located at each end of the rack shaft. The dynamometer is connected to a dynamometer height fine-tuning device, which is in turn connected to the upper bearing seat. The dynamometer rises and falls synchronously with the rack shaft. - The dynamometer height setting and self-locking mechanism includes a slip ring sleeved on the rack shaft, which is located between the upper bearing seat and the cantilever. The mating surfaces of the rack shaft and the slip ring are equipped with axial guide keys. The slip ring is equipped with a set screw. Tightening the screw fixes the slip ring to the rack shaft; loosening the screw allows the slip ring to slide up and down along the rack shaft. There is a self-locking fixing block on the outer circumference of the slip ring, facing the column of the frame. The self-locking fixing block is a wedge-shaped block with flat surfaces on the top, bottom, left and right sides, and a downward inclined surface on the front end. ; Corresponding to the self-locking fixed block, a self-locking mechanism is provided, which includes a clamp fixed on the frame column, a slide integrated with the clamp, a slider and a spring provided in the slide, the spring pushes the slider to extend along the slide, the slider is also a wedge-shaped block, with flat surfaces on the top, bottom, left and right, and an upward inclined surface on the front end, which is adapted to the lower inclined surface of the self-locking fixed block; a slider reset lever is provided on the slide, which is hinged on the slide, and the lever is pushed to make the slider overcome the thrust of the spring and retract into the slide.

2. The spring pressure testing tool as claimed in claim 1, characterized in that: The dynamometer height fine-tuning device includes a vertically arranged screw-nut pair, the screw passes through the upper bearing seat of the rack vertical shaft, the smooth rod section of the screw neck is movably matched with the upper bearing seat, a limit plate is provided on the upper bearing seat, the screw passes through the upper bearing seat and is suspended on the limit plate, an operating knob is provided on the top of the screw, the nut is a square nut, the square nut is fixedly connected to the dynamometer, and when the knob is turned, the screw rotates, causing the square nut to move up and down, driving the dynamometer to rise and fall synchronously.

3. The spring pressure testing tool as claimed in claim 2, characterized in that: The dynamometer includes a mounting plate, the dynamometer is fixed on the mounting plate, the back of the mounting plate is fixedly connected to the square nut, and the back of the mounting plate is also slidably matched with the bottom surfaces of the upper and lower bearing seats of the rack vertical shaft.

4. The spring pressure testing tool as claimed in claim 1, characterized in that: The spring support seat includes a pair of support plates, a table panel, and a spring positioning seat. The support plates are fixed on the frame base, the table panel is overlapped on the top ends of the two support plates, and the spring positioning seat is arranged on the table panel. Spring positioning holes are provided in the centers of the table panel and the spring positioning seat. The spring positioning holes of the table panel and the spring positioning seat are concentric and have the same diameter.

5. The spring pressure testing tool as claimed in claim 4, characterized in that: The spring length detection device is a digital dial indicator, which is arranged in the spring support seat, located under the table panel and fixed to the bottom surface of the table panel. The scale head of the digital dial indicator is upward, passing through the center hole of the table panel and the spring locating seat and protruding out of the table surface, serving as the lower test head of this device and also the positioning core shaft of the test spring.

6. The spring pressure testing tool as claimed in claim 1, characterized in that: The upright column of the frame is a threaded column equipped with a nut. The cantilever is located on the nut. The nut is rotated to adjust the height of the cantilever.

7. The spring pressure testing tool as claimed in claim 1, characterized in that: The length of the spring is L, and its performance is designed to meet the following requirements: when the spring is compressed to a first length L1, the spring pressure N1 is measured; when the spring is compressed to a second length L2, the spring pressure N2 is measured.

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