Inner and outer diameter testing tool

Abstract

The utility model discloses an internal and external diameter testing tool. The tool comprises a small-diameter testing device and a large-diameter testing device. The small diameter testing device comprises an inner diameter testing main body, a first adjustable stretching rod, a second adjustable stretching rod, a first testing rod and a second testing rod; the large-diameter testing device comprises a first-layer testing rod, a second-layer testing rod, a testing rod fixing disc, an inner diameter testing rod, an inner diameter testing supporting rod, an inner diameter testing angle positioning disc, an angle positioning disc supporting rod, a motor, a control device and a water cooling platform. The small-diameter testing device can test the inner diameter and the outer diameter of 0-100mm, the testing precision is + / -0.05 mm, and the reading error is + / -0.1 mm; the large-diameter testing device can be used for testing the inner diameter and the outer diameter within the range of phi 101-phi 500 mm, the testing precision is + / -0.55 mm, and the reading error is + / -0.15 mm; the inner diameter and the outer diameter are in the range of phi 501-phi 1000mm, the test precision is + / -1mm, and the reading error is + / -0.15 mm; the tool provided by the utility model can be used for testing the inner diameter and the outer diameter of 0mm-phi 1000mm, and is large in testing range, good in universality and high in testing precision.

Description

Technical Field

[0001] The utility model relates to the technical field of inner and outer diameter measurement, in particular to an inner and outer diameter testing tool. Background Art

[0002] It is now necessary to measure the inner diameter and outer diameter of sealing circles and sealing gaskets. Most of the current patents cannot achieve simultaneous testing of the inner diameter and outer diameter. Equipment that can simultaneously test the inner and outer diameters has problems such as limited test range, accuracy that cannot meet requirements, and inability to directly read numbers. If dedicated optical automatic testing equipment is used, not only is the price high, but misjudgment may also occur due to light reasons.

[0003] The existing design of the pure mechanical structure of the sealing circle, sealing round gasket inner and outer diameter test fixture has a relatively precise structure, so it is difficult to machine, and the multiple assembly dimensions cause the assembly error to increase after multiple assemblies, affecting the accuracy of the test results. Due to the increase in the size range of the tested products, the test fixture should also be changed accordingly, but the test accuracy of the existing test fixture is greatly affected by the calculated matching amount, and it is difficult to increase it on the basis of the original structure. Therefore, it is necessary to design a test fixture with higher test accuracy, wider test range, and stronger structural versatility to meet the use requirements.

[0004] Currently, no effective solution has been proposed to address the problems of small test range, poor versatility and low test accuracy of test tools in the prior art. Utility Model Content

[0005] The utility model provides an inner and outer diameter testing tool in an embodiment to solve the problems of small testing range, poor versatility and low testing accuracy of the testing tool in the prior art.

[0006] To achieve the above-mentioned purpose, the utility model provides an inner and outer diameter testing tool, which comprises: a small diameter testing device and a large diameter testing device; the small diameter testing device comprises: an inner diameter testing body, a first adjustable stretching rod, a second adjustable stretching rod, a first testing rod and a second testing rod; the first adjustable stretching rod is slidably mounted in the first testing rod; the second adjustable stretching rod is slidably mounted in the second testing rod; the head end of the first adjustable stretching rod is clamped with the head end of the second adjustable stretching rod; the first testing rod is connected to the inner diameter testing body through a first pin; the second testing rod is connected to the inner diameter testing body through a second pin; the surfaces of the inner diameter testing body, the first testing rod and the second testing rod are all marked with scales; the large diameter testing device comprises: a first layer of testing rods, a second layer of testing rods , a test rod fixing plate, an inner diameter test rod, an inner diameter test support rod, an inner diameter test angle positioning plate, an angle positioning plate support rod, a motor and a control device, and a water cooling platform; the second layer of test rods can be slidably mounted in the first layer of test rods; the test rod fixing plate is used to fix the first layer of test rods and the second layer of test rods; one end of the inner diameter test rod is a fixed end, and the other end is a free end; the fixed end is fixed on the inner diameter test angle positioning plate, and the free end is connected to the inner diameter test support rod; the inner diameter test angle positioning plate, the angle positioning plate support rod, the test rod fixing plate, the motor and a control device, and the water cooling platform are connected in sequence; the motor and the control device drive the test rod fixing plate to move; the surfaces of the inner diameter test rod, the first layer of test rod, and the second layer of test rod are all marked with scales.

[0007] Optionally, the first test rod is provided with a through first pin groove for the first pin to penetrate therein; and the second test rod is provided with a through second pin groove for the second pin to penetrate therein.

[0008] Optionally, a first insertion hole and a second insertion hole are respectively provided on both sides of the inner diameter testing body, for respectively allowing the first testing rod and the second testing rod to penetrate.

[0009] Optionally, two opposite third pin grooves are provided in the inner diameter testing body and near the first insertion hole, respectively used for allowing the two ends of the first pin to pass through; two opposite fourth pin grooves are provided in the inner diameter testing body and near the second insertion hole, respectively used for allowing the two ends of the second pin to pass through.

[0010] Optionally, a first through observation hole and a second through observation hole are respectively provided on the front and rear sides of the inner diameter testing body.

[0011] Optionally, a slot is provided on the inner diameter test angle positioning disk for inserting a bayonet at the fixed end of the inner diameter test rod to fix the inner diameter test angle positioning disk to the inner diameter test rod.

[0012] Optionally, the angle between the inner diameter test rod and the central axis of the inner diameter test angle positioning plate is an acute angle.

[0013] Optionally, the inner diameter test support rod is fixed in the assembly groove of the free end of the inner diameter test rod by rotating the positioning pin and the fixing screw.

[0014] Optionally, the second layer of test rods is connected to the first layer of test rods via a fifth pin; the first layer of test rods is provided with a through fifth pin slot for the fifth pin to penetrate.

[0015] Optionally, both the first layer test rod and the second layer test rod are provided with piezoelectric ceramic sheets; lead wires of the piezoelectric ceramic sheets are led out through wire grooves and wire fixing holes and connected to the control device.

[0016] Beneficial effects of the utility model:

[0017] The utility model provides an inner and outer diameter testing tool, which comprises: a small diameter testing device and a large diameter testing device; the small diameter testing device comprises: an inner diameter testing body, a first adjustable stretching rod, a second adjustable stretching rod, a first testing rod and a second testing rod; the large diameter testing device comprises: a first layer of testing rods, a second layer of testing rods, a testing rod fixing plate, an inner diameter testing rod, an inner diameter testing support rod, an inner diameter testing angle positioning plate, an angle positioning plate support rod, a motor and a control device, and a water cooling platform; the small diameter testing device can test inner and outer diameters of 0mm to φ100mm, and can test The accuracy is ±0.05mm, and the reading error is ±0.1mm; the large diameter testing device can test the inner and outer diameters of φ101~φ1000mm, among which, the inner and outer diameters in the range of φ101~φ500mm have a testing accuracy of ±0.55mm and a reading error of ±0.15mm; the inner and outer diameters in the range of φ501~φ1000mm have a testing accuracy of ±1mm and a reading error of ±0.15mm; that is, the tooling of the utility model can test the inner and outer diameters of 0mm~φ1000mm, has a large testing range, good versatility, and high testing accuracy. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a front view of a first test rod provided by an embodiment of the utility model;

[0019] Figure 2 is a front view of a second test rod provided by an embodiment of the utility model;

[0020] Figure 3It is a front view of a first adjustable stretch rod provided in an embodiment of the utility model;

[0021] Figure 4 It is a front view of a second adjustable stretch rod provided in an embodiment of the utility model;

[0022] Figure 5 It is a front view of the inner diameter test body provided by an embodiment of the utility model;

[0023] Figure 6 It is a top view of the inner diameter test body provided by an embodiment of the utility model;

[0024] Figure 7 It is a front view of the first layer of test rods provided by an embodiment of the utility model;

[0025] Figure 8 It is a top view of the first layer of test rods provided by an embodiment of the utility model;

[0026] Fig. 9 It is a front view of the second layer test rod provided by the embodiment of the utility model;

[0027] Fig.10 is a top view of the second layer test rod provided by an embodiment of the utility model;

[0028] Fig.11 It is a front view of the test rod fixing plate provided by the embodiment of the utility model;

[0029] Fig.12 It is a top view of the test rod fixing plate provided by the embodiment of the utility model;

[0030] Fig.13 It is a front view of the inner diameter test rod provided by the embodiment of the utility model;

[0031] Fig.14 This is a front view of an inner diameter test support rod provided by an embodiment of the utility model;

[0032] Fig.15 This is a front view of the inner diameter test angle positioning disk provided by the embodiment of the utility model;

[0033] Fig.16 It is a top view of the inner diameter test angle positioning disk provided by an embodiment of the utility model;

[0034] Fig.17 This is a front view of the angle positioning disk support rod provided by the embodiment of the utility model;

[0035] Fig.18 It is a front view of the large diameter testing device provided by an embodiment of the utility model.

[0036] Explanation of symbols:

[0037] Inner diameter test body-1, first adjustable stretch rod-2, second adjustable stretch rod-3, first test rod-4, second test rod-5, first pin slot-6, first pin-7, second pin slot-8, second pin-9, third pin slot-10, fourth pin slot-11, first insertion hole-12, second insertion hole-13, first observation hole-14, second observation hole-15, first layer test rod-16, second layer test rod-17, test rod fixing plate-18, inner diameter test rod -19, inner diameter test support rod -20, inner diameter test angle positioning plate -21, angle positioning plate support rod -22, motor and control device -23, water cooling platform -24, slot -25, pin -26, rotation positioning pin -27, fixing screw -28, fifth pin slot -29, fifth pin -30, piezoelectric ceramic sheet -31, wire slot -32, wire fixing hole -33, wire fixing sheet -34, first stretching hole -35, second stretching hole -36, seventh pin -37. DETAILED DESCRIPTION

[0038] In order to make the purpose, technical solution and advantages of the utility model clearer, the utility model will be further described in detail below in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0039] It is now necessary to measure the inner diameter and outer diameter of sealing circles and sealing gaskets. Most of the current patents cannot achieve simultaneous testing of the inner diameter and outer diameter. Equipment that can simultaneously test the inner and outer diameters has problems such as limited test range, accuracy that cannot meet requirements, and inability to directly read numbers. If dedicated optical automatic testing equipment is used, not only is the price high, but misjudgment may also occur due to light reasons.

[0040] The existing design of the pure mechanical structure of the sealing circle, sealing round gasket inner and outer diameter test fixture has a relatively precise structure, so it is difficult to machine, and the multiple assembly dimensions cause the assembly error to increase after multiple assemblies, affecting the accuracy of the test results. Due to the increase in the size range of the tested products, the test fixture should also be changed accordingly, but the test accuracy of the existing test fixture is greatly affected by the calculated matching amount, and it is difficult to increase it on the basis of the original structure. Therefore, it is necessary to design a test fixture with higher test accuracy, wider test range, and stronger structural versatility to meet the use requirements.

[0041] Therefore, the utility model provides an inner and outer diameter testing tool with a wide testing range, good versatility and high testing accuracy, the tool comprising: a small diameter testing device and a large diameter testing device;

[0042] The small diameter testing device comprises: an inner diameter testing body 1, a first adjustable stretching rod 2, a second adjustable stretching rod 3, a first testing rod 4 and a second testing rod 5; Figure 1 It is a front view of the first test rod 4 provided in the embodiment of the utility model; Figure 2 It is a front view of the second test rod 5 provided in the embodiment of the utility model; Figure 3 This is a front view of the first adjustable stretching rod 2 provided in the embodiment of the utility model; Figure 4 It is a front view of the second adjustable stretching rod 3 provided in the embodiment of the utility model; Figure 5 This is a front view of the inner diameter test body 1 provided in an embodiment of the utility model;

[0043] Figure 6 1 is a top view of the inner diameter test body 1 provided in the embodiment of the utility model; Figure 1 to Figure 6 As shown,

[0044] The first adjustable stretching rod 2 is slidably mounted in the first test rod 4; the second adjustable stretching rod 3 is slidably mounted in the second test rod 5; the head end of the first adjustable stretching rod 2 is clamped with the head end of the second adjustable stretching rod 3; the first test rod 4 is connected to the inner diameter test body 1 through a first pin 7; the second test rod 5 is connected to the inner diameter test body 1 through a second pin 9; the surfaces of the inner diameter test body 1, the first test rod 4 and the second test rod 5 are all marked with scales;

[0045] Specifically, Figure 3 As shown, in the present application, one side (left side) of the first adjustable stretch rod 2 is a U-shaped structure with an opening to the right, and the other side (right side) is an upward hook structure; Figure 1The first test rod 4 is provided with a through first stretching hole 35, and both sides of the first stretching hole 35 are open structures; wherein the height of the left opening is less than the height of the right opening, and the height of the left opening is just enough to allow the first stretching rod to be rotated 90 degrees in the main view direction (i.e., horizontally) and installed; when the first adjustable stretching rod 2 is assembled in place in the first stretching hole 35 (the first adjustable stretching rod 2 is inserted from the left opening to the right), the first stretching rod is rotated 90 degrees in the opposite direction, i.e., it is turned back to the main view state, and at this time, the height of the right side of the first adjustable stretching rod 2 is just the same as that of the first stretching rod 2. The height of the right opening of the hole 35 is adapted, and the height of the right side of the first adjustable stretch rod 2 is greater than the height of the left opening of the first stretch hole 35. The first adjustable stretch rod 2 can move left and right in the first stretch hole 35, but will not completely break away from the first stretch hole 35, that is, when the right side surface of the U-shaped structure of the first adjustable stretch rod 2 is in contact with the left side surface of the first stretch hole 35, the hook body structure of the first adjustable stretch rod 2 is still in the first stretch hole 35. When the first adjustable stretch rod 2 is pulled out to the left, the height of the hook body structure of the first adjustable stretch rod 2 is greater than the height of the left opening of the first stretch hole 35 and will not be completely pulled out.

[0046] like Figure 4 As shown, in the present application, one side (left side) of the second adjustable stretch rod 3 is an upward hook structure, and the other side (right side) is a backward hook structure; Figure 2 As shown, the second test rod 5 is provided with a through second stretching hole 36, and both sides of the second stretching hole 36 are open structures; wherein, the height of the left opening is less than the height of the right opening, and the height of the left opening is just enough to allow the second stretching rod to be installed in the main view direction; when the second adjustable stretching rod 3 is assembled in place in the second stretching hole 36 (the second adjustable stretching rod 3 is inserted from the left opening to the right opening), the second adjustable stretching rod 3 is rotated backwards by 90 degrees, and at this time, the height of the right side of the second adjustable stretching rod 3 is just the same as the height of the right side opening of the second stretching hole 36. Correspondingly, the height of the right side of the second adjustable stretching rod 3 is greater than the height of the left opening of the second stretching hole 36. The second adjustable stretching rod 3 can move left and right in the second stretching hole 36, but will not completely break away from the second stretching hole 36, that is, when the right side surface of the left end hook of the second adjustable stretching rod 3 is in contact with the left side surface of the second stretching hole 36, the right side hook of the second adjustable stretching rod 3 is still in the second stretching hole 36. When the second adjustable stretching rod 3 is pulled out to the left, the height of the right side hook of the second adjustable stretching rod 3 is greater than the height of the left opening of the second stretching hole 36 and will not be completely pulled out.

[0047] After the first adjustable stretching rod 2 is assembled in the first test rod 4 and the second adjustable stretching rod 3 is assembled in the second test rod 5, the assembled second test rod 5 is interchanged left and right, and the second test rod 5 is located on the left side of the first test rod 4, so that the second adjustable stretching rod 3 can be inserted into the U-shaped structure of the first adjustable stretching rod 2, but the two are not connected at this time.

[0048] A scale edge is provided on the upper surface of the first test rod 4, the scale range is 0mm-40mm, and the ratio is 1:1; a scale edge is provided on the upper surface of the second test rod 5, the scale range is 0mm-40mm, and the ratio is 1:1.

[0049] like Figure 1 As shown, the first test rod 4 is provided with a through first pin groove 6 for the first pin 7 to pass through (i.e., both the front and rear ends of the first pin 7 pass through the first pin groove 6); the first pin groove 6 is located on the first stretching hole 35; Figure 5 As shown, after completion, the first test rod 4 is inserted into the first insertion hole 12 on the right side of the inner diameter test body 1, and the front and rear ends of the first pin 7 are respectively inserted obliquely into two opposite third pin grooves 10, so that the first test rod 4 is connected to the inner diameter test body 1; the two opposite third pin grooves 10 are set in the inner diameter test body 1 near the first insertion hole 12;

[0050] like Figure 2 As shown, the second test rod 5 is provided with a through second pin slot 8 for the second pin 9 to pass through (i.e., both the front and rear ends of the second pin 9 pass through the second pin slot 8); the second pin slot 8 is located below the second stretching hole 36; Figure 5 As shown, after completion, the second test rod 5 is inserted into the second insertion hole 13 on the left side of the inner diameter test body 1, and the front and rear ends of the second pin 9 are respectively obliquely pushed into two opposite fourth pin grooves 11 to connect the second test rod 5 to the inner diameter test body 1; the two opposite fourth pin grooves 11 are arranged in the inner diameter test body 1 near the second insertion hole 13.

[0051] At this time, the second adjustable stretch rod 3 is clamped with the U-shaped structure of the first adjustable stretch rod 2, and the second adjustable stretch rod 3 is fixedly connected with the first adjustable stretch rod 2 using the sixth pin; the two ends of the sixth pin are fixed in the form of threaded sleeves (i.e., fixed by nuts or spiral buckles).

[0052] The first pin 7 can move in the first pin slot 6 or in two opposite third pin slots 10; the second pin 9 can move in the second pin slot 8 or in two opposite fourth pin slots 11. The size adjustment function of the test rod is achieved by the movement of the first pin 7 and the second pin 9.

[0053] Furthermore, the inner diameter testing body 1 is a conical structure; scale lines are arranged on the outer surface of the inner diameter testing body 1 and at the first insertion hole 12 and the second insertion hole 13, so as to directly read the sealing circle and the sealing circle gasket; the front and rear sides of the inner diameter testing body 1 are respectively provided with a first observation hole 14 and a second observation hole 15, so as to perform assembly operation, i.e., the first adjustable stretching rod 2 and the second adjustable stretching rod 3 can be clamped and fixed.

[0054] The small diameter test device of the present application can test the inner diameter and outer diameter of 0mm to 100mm. The specific test process is as follows:

[0055] Before the test, the device is installed in place according to the above description, the first test rod 4 and the second test rod 5 are placed in the highest position, the tested sealing circle or sealing circle cushion is put on the outside of the inner diameter test body 1, and the tip falls freely, and drives the first test rod 4 and the second test rod 5 to fall. During the falling process, with the movement of the first pin 7 in the first pin groove 6 of the first test rod 4 and the movement of the second pin 9 in the second pin groove 8 of the second test rod 5, the first adjustable stretch rod 2 and the second adjustable stretch rod 3 are gradually pulled apart, which plays a role in size adjustment. At the same time, since the first pin 7 moves in the third pin groove 10 of the inner diameter test body 1 and the second pin 9 moves in the fourth pin groove 11 of the inner diameter test body 1, it can Ensure that the object to be measured (sealing circle or sealing circular pad) is in the same horizontal direction as the first test rod 4 and the second test rod 5, and the first test rod 4 and the second test rod 5 can always exceed a certain size of the outer surface of the inner diameter test body 1. When the object to be measured (sealing circle or sealing circular pad) cannot fall due to gravity, the first test rod 4 and the second test rod 5 will no longer fall due to the resistance of the first pin groove 6 and the second pin groove 8 and the friction of the first adjustable stretch rod 2 and the second adjustable stretch rod 3. At this time, the inner diameter can be directly read through the inner diameter test body 1, and the outer diameter can be directly read through the first test rod 4 and the second test rod 5. In order to reduce the measurement error, the average value can be taken to make a qualified judgment.

[0056] The small diameter testing device of the present application has a testing accuracy of ±0.05mm, a reading error of ±0.1mm, and a maximum testing deviation of approximately 0.5mm.

[0057] The large diameter testing device comprises: a first layer testing rod 16, a second layer testing rod 17, a testing rod fixing plate 18, an inner diameter testing rod 19, an inner diameter testing support rod 20, an inner diameter testing angle positioning plate 21, an angle positioning plate support rod 22, a motor and control device 23, and a water cooling platform 24; Figure 7 It is a front view of the first layer test rod 16 provided in the embodiment of the utility model; Figure 8 is a top view of the first layer of test rods 16 provided in an embodiment of the utility model; Fig. 9It is a front view of the second layer test rod 17 provided in the embodiment of the utility model; Fig.10 is a top view of the second layer test rod 17 provided in the embodiment of the utility model; Fig.11 It is a front view of the test rod fixing plate 18 provided in the embodiment of the utility model; Fig.12 It is a top view of the test rod fixing plate 18 provided in the embodiment of the utility model; Fig.13 It is a front view of the inner diameter test rod 19 provided in the embodiment of the utility model; Fig.14 It is a front view of the inner diameter test support rod 20 provided in the embodiment of the utility model; Fig.15 This is a front view of the inner diameter test angle positioning disk 21 provided in the embodiment of the utility model; Fig.16 It is a top view of the inner diameter test angle positioning disk 21 provided in the embodiment of the utility model; Fig.17 This is a front view of the angle positioning disk support rod 22 provided in the embodiment of the utility model;

[0058] Fig.18 1 is a front view of a large diameter testing device provided by an embodiment of the utility model. Figure 7 to Figure 18 As shown,

[0059] The second layer test rod 17 is slidably installed in the first layer test rod 16; the test rod fixing plate 18 is used to fix the first layer test rod 16 and the second layer test rod 17; one end of the inner diameter test rod 19 is a fixed end, and the other end is a free end; the fixed end is fixed on the inner diameter test angle positioning plate 21, and the free end is connected to the inner diameter test support rod 20; the inner diameter test angle positioning plate 21, the angle positioning plate support rod 22, the test rod fixing plate 18, the motor and control device 23, and the water cooling platform 24 are connected in sequence; the motor and control device 23 drives the test rod fixing plate 18 to move; the surfaces of the inner diameter test rod 19, the first layer test rod 16, and the second layer test rod 17 are all marked with scales.

[0060] Specifically, the first-layer test rod 16 is provided with a test jack for inserting the second-layer test rod 17, and the second-layer test rod 17 can slide inside the first-layer test rod 16; the second-layer test rod 17 is fixedly connected to the first-layer test rod 16 via a seventh pin 37, that is, a corresponding pin hole is provided on the second-layer test rod 17 (on the right side) to allow the seventh pin 37 to penetrate, and both ends of the seventh pin 37 are fixed to the first-layer test rod 16 in the form of a threaded sleeve to prevent the second-layer test rod 17 from falling off from the first-layer test rod 16.

[0061] Furthermore, the second layer test rod 17 is connected to the first layer test rod 16 via a fifth pin 30; the first layer test rod 16 is provided with a through fifth pin groove 29 for the fifth pin 30 to penetrate; specifically, two fifth pins 30 are provided, and the fifth pin 30 can slide left and right along the fifth pin groove 29.

[0062] In the present application, four first-layer test rods 16 are provided, and four second-layer test rods 17 are correspondingly provided; scales are marked on the upper end surfaces of the first-layer test rods 16 and the second-layer test rods 17 respectively, the effective test range of the first-layer test rods 16 is 98mm~350mm, and the scale interval is 0.5mm, and the effective test range of the second-layer test rods 17 is 351mm~565mm, and the scale interval is 0.5mm. When the outer diameter of the object to be measured (sealing circle or sealing round gasket) is less than or equal to φ700mm, only the first-layer test rods 16 are used, that is, the second-layer test rods 17 (4) are put into the first-layer test rods 16 (4) by using the seventh pins 37 (4), and the two ends of the seventh pins 37 are fixed to the first-layer test rods 16 in the form of threaded sleeves to prevent the second-layer test rods 17 from falling off. When the outer diameter range of the object to be measured (sealing circle or sealing round gasket) is φ700mm~φ1000mm, the seventh pin 37 (4 pieces) is removed, and the second layer test rods 17 (4 pieces) are all pulled out from the first layer test rods 16 (4 pieces), and the fifth pin 30 (8 pieces) is used to slide in the fifth pin groove 29 to realize the size adjustment function of the test rod, and the second layer test rod 17 will not be completely pulled out from the first layer test rod 16.

[0063] The assembled first layer test rods 16 and second layer test rods 17 are assembled into the test rod fixing plate 18 by using fixing screws 28 .

[0064] The first layer test rod 16 and the second layer test rod 17 are both provided with a piezoelectric ceramic sheet 31; the piezoelectric ceramic sheet 31 will not cover the place where the scale is marked, and will not affect the reading; the lead wire of the piezoelectric ceramic sheet 31 is led out through the wire groove 32 and the wire fixing hole 33 and connected to the control device;

[0065] In the present application, in order to prevent the lead wires of the piezoelectric ceramic sheet 31 from being subjected to stress and causing poor contact, a wire groove 32 and a wire fixing plate 34 are provided on the first-layer test rod 16, and a wire groove 32 and a wire fixing hole 33 are provided on the second-layer test rod 17. The wire groove 32 and the wire fixing hole 33 are also designed in the hollow of the test rod fixing plate 18 and the angle positioning plate support rod 22. When the first-layer test rod 16 and the second-layer test rod 17 are assembled, the lead wires of the piezoelectric ceramic sheet 31 on the first-layer test rod 16 are led out through the wire groove 32 and the wire fixing plate 34, and the piezoelectric ceramic sheet 31 on the second-layer test rod 17 is connected to the test rod 16. The lead wire of 31 is led to the outer surface of the first layer test rod 16 through the wire groove 32 and the wire fixing hole 33, and the wire harness is connected in parallel with the threshold circuit control end of the control device to play a control role, that is, to control the operation of the motor, and then drive the first layer test rod 16 and the second layer test rod 17 to move. The movement of the first layer test rod 16 and the second layer test rod 17 will drive the movement of the test rod fixing plate 18. Therefore, the hollow arrangement of the wire groove 32 and the wire fixing hole 33 in the test rod fixing plate 18 and the angle positioning plate support rod 22 can reduce the risk of cable stress caused by the vertical movement of the test rod fixing plate 18.

[0066] During operation, the control voltage of the start control device is provided by the threshold circuit. When the piezoelectric ceramic piece 31 is affected by the gravity of the gasket, a pulse voltage is generated. When the instantaneous voltage is greater than the threshold value, the motor is started. When the piezoelectric ceramic piece 31 is no longer affected by the gravity of the gasket, a reverse pulse voltage is generated. When the instantaneous voltage is greater than the threshold value, the motor is controlled to stop. Due to the short response time, the highest point of the sealing circle or sealing round gasket can be located, which is beneficial to the subsequent thickness value measurement and hardness measurement.

[0067] In the present application, the inner diameter test angle positioning disk 21 is a disc-shaped structure, and a card slot 25 (4 in the present application) is provided on the inner diameter test angle positioning disk 21, which is used to insert the card pin 26 at the fixed end of the inner diameter test rod 19 (4 in the present application) so that the inner diameter test angle positioning disk 21 is fixed to the inner diameter test rod 19; the bottom end of the inner diameter test angle positioning disk 21 is fixedly connected to the top end of the angle positioning disk support rod 22; the bottom end of the angle positioning disk support rod 22 is inserted and fixed in the center hole of the test rod fixing disk 18.

[0068] The angle between the inner diameter test rod 19 and the central axis of the inner diameter test angle positioning disk 21 is an acute angle, that is, the fixed end of the inner diameter test rod 19 is inserted into the corresponding slot 25 along the inclined surface of the edge of the angle positioning disk. In the present application, the acute angle is 45°. The inner diameter test rod 19 (4 pieces) is marked with scales, and its effective test range is 98mm~1000mm, the scale spacing is 0.5mm, and the ratio is 1.414:1, which is consistent with the test angle of 45°. The reason for setting the test angle to 45° is to reduce the measurement accuracy deviation caused by the response time. At the same time, 45° is conducive to design calculation and reduces the test error caused by the rounding deviation of the design calculation.

[0069] In order to reduce the angular deviation of the end (free end) of the inner diameter test rod 19 due to gravity, the inner diameter test support rods 20 (4 pieces) are designed to play a supporting role, that is, the lower section of the inner diameter test support rod 20 is placed in the assembly groove of the free end of the inner diameter test rod 19. Specifically, the inner diameter test support rod 20 is received in the assembly groove of the free end of the inner diameter test rod 19 by rotating the positioning pins 27 (4 pieces) and the fixing screws 28 (4 pieces). The fixing screws 28 are used to fix the inner diameter test support rod 20 to the top of the assembly groove, and the rotating positioning pins 27 are used to fix the inner diameter test support rod 20 to the top of the assembly groove. The test support rod 20 is fixed to the bottom end of the assembly groove, that is, the rotating positioning pin 27 passes through the inner diameter test support rod 20, and its two ends are fixed to the inner wall of the assembly groove in the form of threaded sleeves (the inner wall of the assembly groove is fixed with a nut or a spiral buckle, which is threadedly connected to the two ends of the rotating positioning pin 27); during work, loosen and remove the fixing screw 28 between the inner diameter test support rod 20 and the inner diameter test rod 19, then the inner diameter test support rod 20 rotates and falls under the action of gravity with the rotating positioning pin 27 as the center, and is kept in a vertical state by the limit block in the assembly groove of the inner diameter test rod 19.

[0070] The motor and control device 23 are arranged at the bottom end of the test rod fixing plate 18, and are installed on the water cooling platform 24. The motor shaft fits with the lower end surface of the test rod fixing plate 18. During installation, it should be ensured that the lower end surface of the water cooling platform 24 and the lower end surface of the inner diameter test support rod 20 are on the same plane. Under the action of the motor shaft, the test rod fixing plate 18 is parallel to the ground.

[0071] The large diameter test device of the present application can test the inner diameter and outer diameter of 101mm to 1000mm. The specific test process is as follows:

[0072] When in use, whether to pull out the second layer of test rods 17 is determined according to the size of the object to be tested (sealing circle or sealing round gasket), that is, when the outer diameter of the object to be tested (sealing circle or sealing round gasket) is less than or equal to φ700mm, only the first layer of test rods 16 are used; when the outer diameter range of the object to be tested (sealing circle or sealing round gasket) is φ700mm~φ1000mm, the second layer of test rods 17 is pulled out, and the motor and control device 23 are used to lift the test rod fixing plate 18 to the highest point, and the object to be tested (sealing circle or sealing round gasket) is put on the outside of the inner diameter test rod 19, and it falls freely from the top. When it falls to the first layer When the test rod 16 or the second layer test rod 17 is on, the piezoelectric ceramic piece 31 is stressed, and the control device outputs a start control signal. Through the conversion circuit, the motor shaft drives each test rod and the object to be tested to move downward at a uniform speed of 0.5m / s. When the object to be tested cannot fall due to gravity, the piezoelectric ceramic piece 31 is no longer stressed, and then outputs a reverse voltage, and the motor is controlled to stop moving through the conversion circuit. Due to the combined effect of the circuit function and the feedback speed of the piezoelectric ceramic piece 31, the motion component has a short response time, and can accurately locate the top of the sealing circle or the sealing round pad, which can provide conditions for subsequent matching thickness and hardness measurement. At the same time, in order to avoid ripples caused by the force fluctuation of the piezoelectric ceramic piece 31, a dual structure of a filter circuit and a threshold circuit is designed to prevent the motor from malfunctioning and affecting the test accuracy. At this time, the inner diameter can be directly read through the inner diameter test rod 19, and the outer diameter can be directly read through the first layer test rod 16 and the second layer test rod 17.

[0073] The large diameter testing device of the present application can test the inner and outer diameters of φ101~φ1000mm, among which, the inner and outer diameters in the range of φ101~φ500mm have a testing accuracy of ±0.55mm and a reading error of ±0.15mm; the inner and outer diameters in the range of φ501~φ1000mm have a testing accuracy of ±1mm and a reading error of ±0.15mm.

[0074] Beneficial effects of the utility model:

[0075] The utility model provides an inner and outer diameter testing tool, which comprises: a small diameter testing device and a large diameter testing device; the small diameter testing device comprises: an inner diameter testing body 1, a first adjustable stretching rod 2, a second adjustable stretching rod 3, a first testing rod 4 and a second testing rod 5; the large diameter testing device comprises: a first layer testing rod 16, a second layer testing rod 17, a testing rod fixing plate 18, an inner diameter testing rod 19, an inner diameter testing support rod 20, an inner diameter testing angle positioning plate 21, an angle positioning plate support rod 22, a motor and a control device 23, and a water cooling platform 24; the small diameter testing device can test 0mm~φ The test accuracy of the inner and outer diameter of 100mm is ±0.05mm, and the reading error is ±0.1mm; the large diameter testing device can test the inner and outer diameters of φ101~φ1000mm, among which, the test accuracy of the inner and outer diameters in the range of φ101~φ500mm is ±0.55mm, and the reading error is ±0.15mm; the test accuracy of the inner and outer diameters in the range of φ501~φ1000mm is ±1mm, and the reading error is ±0.15mm; that is, the tooling of the utility model can test the inner and outer diameters of 0mm~φ1000mm, with a large test range, good versatility and high test accuracy.

[0076] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the utility model, rather than to limit it. Although the utility model has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the various embodiments of the utility model.

Claims

1. An inner and outer diameter testing tool, characterized in that: include: Small diameter test device and large diameter test device; The small diameter testing device comprises: an inner diameter testing body, a first adjustable stretching rod, a second adjustable stretching rod, a first testing rod and a second testing rod; The first adjustable stretching rod is slidably mounted in the first test rod; the second adjustable stretching rod is slidably mounted in the second test rod; the head end of the first adjustable stretching rod is clamped with the head end of the second adjustable stretching rod; the first test rod is connected to the inner diameter test body through a first pin; the second test rod is connected to the inner diameter test body through a second pin; the surfaces of the inner diameter test body, the first test rod and the second test rod are all marked with scales; The large diameter testing device comprises: a first layer testing rod, a second layer testing rod, a testing rod fixing plate, an inner diameter testing rod, an inner diameter testing support rod, an inner diameter testing angle positioning plate, an angle positioning plate support rod, a motor and a control device, and a water cooling platform; The second layer of test rods can be slidably installed in the first layer of test rods; the test rod fixing plate is used to fix the first layer of test rods and the second layer of test rods; one end of the inner diameter test rod is a fixed end, and the other end is a free end; the fixed end is fixed on the inner diameter test angle positioning plate, and the free end is connected to the inner diameter test support rod; the inner diameter test angle positioning plate, the angle positioning plate support rod, the test rod fixing plate, the motor and control device, and the water cooling platform are connected in sequence; the motor and the control device drive the test rod fixing plate to move; the surfaces of the inner diameter test rod, the first layer of test rod, and the second layer of test rod are all marked with scales.

2. The tooling according to claim 1, characterized in that: The first test rod is provided with a through first pin groove for the first pin to penetrate therein; the second test rod is provided with a through second pin groove for the second pin to penetrate therein.

3. The tooling according to claim 2, characterized in that: A first insertion hole and a second insertion hole are respectively provided on both sides of the inner diameter testing body, and are used to respectively allow the first testing rod and the second testing rod to penetrate.

4. The tooling according to claim 3, characterized in that: Two opposite third pin grooves are provided in the inner diameter test body and near the first insertion hole, respectively used for two ends of the first pin to penetrate therein; Two opposite fourth pin grooves are arranged in the inner diameter test body and near the second insertion hole, and are used for the two ends of the second pin to penetrate respectively.

5. The tooling according to claim 1, characterized in that: The front and rear sides of the inner diameter test body are respectively provided with a first through observation hole and a second through observation hole.

6. The tooling according to claim 1, characterized in that: The inner diameter test angle positioning disk is provided with a slot for inserting a bayonet at the fixed end of the inner diameter test rod so as to fix the inner diameter test angle positioning disk and the inner diameter test rod.

7. The tooling according to claim 6, characterized in that: The included angle between the inner diameter test rod and the central axis of the inner diameter test angle positioning plate is an acute angle.

8. The tooling according to claim 1, characterized in that: The inner diameter test support rod is fixed in the assembly groove of the free end of the inner diameter test rod by rotating the positioning pin and the fixing screw.

9. The tooling according to claim 1, characterized in that: The second layer of test rods is connected to the first layer of test rods via a fifth pin; the first layer of test rods is provided with a through fifth pin slot for the fifth pin to penetrate.

10. The tooling according to claim 9, characterized in that: The first layer of test rods and the second layer of test rods are both provided with piezoelectric ceramic sheets; lead-out wires of the piezoelectric ceramic sheets are led out through wire grooves and wire fixing holes and connected to the control device.

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