Gap measuring device

Abstract

The present invention discloses a gap measuring device, comprising: a first clamping assembly, the first clamping assembly comprising a first base provided with a guide hole, and a first clamping unit arranged in a circumferential direction around the guide hole, the first clamping unit being capable of clamping the object to be measured; a second clamping assembly arranged between the first clamping units, the second clamping assembly being capable of being connected and fixed to the object to be measured; a connecting shaft passing through the guide hole and connected to the second clamping assembly, the connecting shaft being capable of being connected to a driving device to drive the connecting shaft to move axially along the guide hole; and a displacement sensor connected to the second clamping assembly. The rod and the sleeve of the object to be measured are respectively connected and fixed to the first clamping assembly and the second clamping assembly, and the second clamping assembly is driven by the driving device to move axially relative to the rod with the sleeve, thereby measuring the axial spacing between the rod and the sleeve. In particular, since the connecting shaft is arranged in the guide hole of the first clamping assembly, the second clamping assembly can be ensured to move axially along the rod.

Description

Technical Field

[0001] The present invention relates to the technical field of data measurement, in particular to a gap measuring device. Background Art

[0002] In the process of industrial production, there is a type of parts that need to control the gap between the riveted parts. This gap is very small, approximately between 0.02 and 0.1 mm.

[0003] For example, in a car's braking system, the axial clearance between the connecting rod and the master cylinder piston must be less than or equal to 0.1mm to prevent brake response delays or piston sticking. Excessive clearance can cause pedal play, while too little can cause drag. To precisely control the gap between riveted components, a device is needed to detect the post-riveting clearance. Summary of the Invention

[0004] In order to overcome the defects in the prior art, the present invention provides a gap measuring device, in which the guide holes of the second clamping component and the first clamping component are coaxially arranged to ensure that the moving path of the second clamping component during measurement is axial to the workpiece to be measured, thereby ensuring the accuracy of the measurement results.

[0005] To achieve the above object, the present invention adopts a technical solution: a gap measuring device, which can be used to measure the axial movable distance between movable connection parts, comprising:

[0006] A first clamping assembly, comprising a first base having a guide hole and a first clamping unit arranged in a circumferential direction around the guide hole, wherein the first clamping unit can clamp the object to be measured;

[0007] A second clamping assembly, the second clamping assembly being provided between the first clamping units and being capable of being connected and fixed to the object to be measured;

[0008] a connecting shaft, the connecting shaft passing through the guide hole and connected to the second clamping assembly, the connecting shaft being connectable to a driving device so as to be driven by the driving device to move axially along the guide hole;

[0009] A displacement sensor is connected to the second clamping assembly.

[0010] Using the above technical solution, the rod and sleeve of the object under test are connected and fixed to the first and second clamping assemblies, respectively. A driving device drives the second clamping assembly to move the sleeve axially relative to the rod, thereby measuring the axial spacing between the rod and the sleeve. Because the connecting shaft is disposed within the guide hole of the first clamping assembly, the second clamping assembly can move axially along the rod, ensuring the accuracy of the measurement results.

[0011] Furthermore, the second clamping assembly includes:

[0012] a second base, the second base being connected to the connecting shaft, and the second base being provided with a first through hole;

[0013] a second clamping unit, the second clamping unit being arranged on the second base around a circumferential direction of the first through hole;

[0014] The connecting shaft is provided with an axial hole penetrating the connecting shaft along its axial direction;

[0015] The displacement sensor includes an iron core, which is inserted into the shaft hole of the connecting shaft and the first through hole of the second base.

[0016] The displacement sensor includes a coil bobbin with a coil mounted thereon and an iron core inserted within the coil bobbin. A spring is disposed between the coil bobbin and the iron core. When the second clamping assembly clamps the object to be measured, the iron core is pressed against the object to be measured by the spring.

[0017] Furthermore, the first clamping unit includes a first end connected to the first base and a second end for clamping the object to be measured, wherein the second end is closer to the clamping position than the first end. Through the above technical solution, there is space between the first clamping units to place the second clamping assembly.

[0018] With the above solution, when the first clamping assembly clamps the rod, the rod and the guide hole are coaxial, so as to ensure that the kit of the object to be measured can move along the axial direction of the rod during subsequent measurement.

[0019] Furthermore, a first positioning member is provided at the second end of the first clamping unit. The first positioning member can be arranged in an arc shape. Initially, the first clamping units are separated from each other. The rod is placed between the first clamping units, and the first clamping units move toward each other, thereby clamping the rod between the first positioning members.

[0020] Furthermore, the driving device includes a first cylinder and a second cylinder arranged back to back, the cylinder bodies of the first cylinder and the second cylinder are connected and fixed, the driving end of the first cylinder is connected to the connecting shaft, and the driving end of the second cylinder is connected to the support surface.

[0021] Initially, the first cylinder extends and the second cylinder retracts to fix the relative position of the second clamping assembly and the first clamping assembly, making it easier for the second clamping assembly and the first clamping assembly to clamp the kit and the rod of the object to be tested;

[0022] The second cylinder extends to push the sleeve toward the rod so that the end of the rod abuts against the inner bottom of the sleeve;

[0023] The first cylinder and the second cylinder are retracted simultaneously to allow the rod to complete its axial limit displacement in the sleeve, which is the axial clearance between the rod and the sleeve.

[0024] Furthermore, it also includes:

[0025] a first support platform, wherein the first support platform is provided with a second through hole, the first base is fixed on the first support platform, and the guide hole of the first clamping assembly and the second through hole are coaxially arranged;

[0026] a second support platform, the second support platform being arranged on a side of the first support platform away from the first clamping assembly, the second support platform being connected to a driving end of the second cylinder;

[0027] A guide rod, wherein both ends of the guide rod are connected to the first support platform and the second support platform respectively;

[0028] A linear bearing, wherein the linear bearing is sleeved on the guide rod;

[0029] A connecting member is connected to the linear bearing, and the connecting member connects the driving end of the first cylinder and the connecting shaft.

[0030] Through the above technical solution, the guide rod and guide sleeve can further limit the movement path of the connecting member, that is, limit the movement path of the connecting shaft and the second clamping assembly, thereby further ensuring that the kit of the object to be measured can move along the axial direction of the rod during measurement.

[0031] Furthermore, it includes a first stopper, which is arranged on the moving path of the connecting member and can limit the moving range of the connecting member.

[0032] Furthermore, a limit plate is provided on the cylinder body of the second cylinder, a second stopper is provided on the second support platform, and the second stopper is arranged on the moving path of the limit plate.

[0033] Furthermore, a threaded hole is provided at a position of the first stopper relative to the connecting member, and a screw is provided in the threaded hole;

[0034] A threaded hole is provided at a position of the second stopper relative to the limiting plate, and a screw is provided in the threaded hole.

[0035] By adjusting the position of the screw relative to the threaded hole, the restriction range of the first stopper and the second stopper on the connecting member and the limiting plate can be changed.

[0036] Furthermore, a sensor is included, and the sensor is arranged on the first supporting platform, and the sensor can identify whether there is an object to be measured in the first clamping unit.

[0037] By means of the above technical solution, the beneficial effects of the present invention are as follows:

[0038] The gap measuring device disclosed in the present application connects and fixes a rod and a sleeve of a to-be-measured object to a first clamping assembly and a second clamping assembly, respectively. A driving device drives the second clamping assembly to move the sleeve axially relative to the rod, thereby measuring the axial spacing between the rod and the sleeve. Since the connecting shaft is disposed in a guide hole of the first clamping assembly, the second clamping assembly can be ensured to move axially along the rod, thereby ensuring the accuracy of the measurement results.

[0039] The present application provides a first stopper and a second stopper on the moving path of the connecting member and the limiting plate, thereby limiting the moving range of the connecting member and the limiting plate and preventing the excessive force of the cylinder from deforming the kit or the rod.

[0040] In order to make the above and other objects, features and advantages of the present invention more obvious and easy to understand, preferred embodiments are given below and described in detail with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0041] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0042] Figure 1 1 is a schematic diagram of the overall structure of the gap measuring device according to an embodiment of the present invention;

[0043] Figure 2 is a structural schematic diagram of the first clamping assembly in an embodiment of the present invention;

[0044] Figure 3 is a structural schematic diagram of the second clamping assembly in an embodiment of the present invention;

[0045] Figure 4 1 is a schematic structural diagram of a displacement sensor according to an embodiment of the present invention;

[0046] Figure 5 is a schematic structural diagram of a connecting member in an embodiment of the present invention;

[0047] Figure 6 2 is a schematic structural diagram of a blocking member in an embodiment of the present invention;

[0048] Figure 7 Schematic diagram of the structure of the object to be tested in an embodiment of the present invention.

[0049] 1. First clamping assembly; 11. First base; 12. Guide hole; 13. First claw member; 14. First positioning member; 2. Second clamping assembly; 21. Second base; 22. Second claw member; 221. First through hole; 3. Connecting shaft; 4. Driving device; 41. First cylinder; 42. Second cylinder; 5. Displacement sensor; 51. Iron core; 52. Housing; 53. Spring; 61. Fixing frame; 62. First support platform; 63. Second support platform; 64. Guide rod; 65. Linear bearing; 66. Connecting member; 661. Cross bar; 662. Vertical bar; 663. Disc; 71. Connecting plate; 72. First U-shaped plate; 73. Screw; 74. Second U-shaped plate; 8. Limiting plate; 9. Sensor; 101. Rod; 102. Kit. DETAILED DESCRIPTION

[0050] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0051] It should be noted that, in the description of the present invention, the terms "first," "second," etc., are used solely for descriptive purposes and to distinguish similar objects. There is no order of precedence between the two, nor should they be construed as indicating or implying relative importance. Furthermore, in the description of the present invention, unless otherwise specified, "plurality" means two or more.

[0052] Embodiment: This embodiment discloses a gap measuring device that can be used to measure the axial movable distance between movable connection parts, including:

[0053] A first clamping assembly 1, comprising a first base 11 having a guide hole 12, and a first claw 13 arranged in a circumferential direction around the guide hole 12, wherein the first claw 13 can clamp the object to be measured;

[0054] A second clamping assembly 2, the second clamping assembly 2 is provided between the first claws 13, and the second clamping assembly 2 can be connected and fixed to the object to be measured;

[0055] a connecting shaft 3 passing through the guide hole and connected to the second clamping assembly 2;

[0056] a driving device 4, the driving device 4 being connected to the connecting shaft 3 and capable of driving the connecting shaft 3 to move axially along the guide hole;

[0057] The displacement sensor 5 is connected to the second clamping assembly 2 and can detect the movement distance of the second clamping assembly 2.

[0058] Using the above technical solution, the rod 101 and sleeve 102 of the object to be measured are connected and fixed to the first clamping assembly 1 and the second clamping assembly 2, respectively. The second clamping assembly 2 is driven by the driving device 4 to move the sleeve 102 axially relative to the rod 101, thereby measuring the axial spacing between the rod 101 and the sleeve 102. In particular, because the connecting shaft 3 is disposed within the guide hole of the first clamping assembly 1, the second clamping assembly 2 can be ensured to move axially along the rod 101, ensuring the accuracy of the measurement results.

[0059] In some possible embodiments, such as Figure 2 As shown, the first clamping assembly 1 includes a first base 11, which is fixed at a preset position. The first base 11 is provided with a guide hole 12. At least two first claw members 13 are provided on the first base 11 and in a circumferential direction around the guide hole 12. The first claw members 13 can move toward or away from each other. The first claw member 13 has a first end and a second end that are opposite. The first end of the first claw member 13 is connected to the first base 11, and the second end of the first claw member 13 is bent inward. The second end of the first claw member 13 is also provided with a first positioning member 14, and the first positioning member 14 has an arc-shaped area for clamping the rod member 101.

[0060] The number of the first claw members 13 may be two, three or four.

[0061] In some feasible embodiments, the first clamping assembly 1 may be a pneumatic clamp, specifically a pneumatic three-point clamp, wherein the chuck body of the pneumatic three-point clamp is provided with a guide hole 12 .

[0062] The rod 101 can be clamped by opening and closing the first claw member 13 , thereby fixing the position of the rod 101 .

[0063] The second clamping assembly 2 is disposed between the first claw members 13 .

[0064] In some possible embodiments, such as Figure 3 As shown, the second clamping assembly 2 includes:

[0065] The second base 21 is connected to the connecting shaft 3 and is provided with a first through hole 221. At least two second claws 22 are provided on the second base 21 and circumferentially around the first through hole 221. The second claws 22 can move toward or away from each other, and the facing sides of the second claws 22 are configured to match the shape of the sleeve 102.

[0066] In some feasible embodiments, the second clamping assembly 2 may be a pneumatic clamp, specifically a pneumatic three-point clamp, wherein the chuck body of the pneumatic three-point clamp is provided with a first through hole 221 .

[0067] Combine Figure 1 、 4 As shown, the connecting shaft 3 is provided with an axial hole passing through the connecting shaft 3 along its axial direction, and the displacement sensor 5 includes an iron core 51, which is passed through the axial hole of the connecting shaft 3 and the first through hole 221 of the second base 21, and is arranged between the second claws 22.

[0068] Among them, Figure 4 As shown, the displacement sensor 5 is secured by a mounting bracket 61. The displacement sensor 5 includes a housing 52, within which is disposed a coil bobbin, which is provided with a coil, and an iron core 51 inserted within the coil bobbin. A spring 53 is disposed between the housing 52 and the iron core 51. When the second clamping assembly 2 clamps the sleeve 102, the iron core 51 is abutted against the sleeve 102 by the action of the spring 53.

[0069] In some feasible embodiments, the height of the fixing bracket 61 is adjustable, so that the position of the iron core 51 relative to the second claw member 22 can be adjusted.

[0070] In some feasible embodiments, the displacement sensor 5 can be a linear variable differential transformer, i.e., a linear displacement sensor. The linear displacement sensor is composed of a primary coil, two secondary coils, an iron core 51, a coil skeleton, a housing 52, and other components. The primary coil and the secondary coil are distributed on the coil skeleton, and there is a freely movable rod-shaped iron core inside the coil. When the iron core is in the middle position, the induced electromotive force generated by the two secondary coils is equal, so the output voltage is zero; when the iron core moves inside the coil and deviates from the center position, the induced electromotive force generated by the two coils becomes unequal, and a voltage is output, the magnitude of which depends on the magnitude of the displacement.

[0071] The first clamping assembly 1 is arranged on a first support platform 62 , the first support platform 62 is provided with a second through hole, the first base 11 is fixed on the first support platform 62 , and the guide hole 12 of the first clamping assembly 1 and the second through hole are coaxially arranged.

[0072] A second support platform 63 is provided on the side of the first support platform 62 away from the first clamping assembly 1 . A guide rod 64 is provided between the second support platform 63 , the first support platform 62 and the second support platform 63 , and a linear bearing 65 is provided on the guide rod 64 .

[0073] In some possible embodiments, such as Figure 5As shown, the driving device 4 includes a first cylinder 41 and a second cylinder 42 arranged back to back, the cylinder bodies of the first cylinder 41 and the second cylinder 42 are connected and fixed, the driving end of the first cylinder 41 is connected to the connecting shaft 3, and the driving end of the second cylinder 42 is connected to the second support platform 63.

[0074] In some feasible embodiments, the driving end of the first cylinder 41 and the connecting shaft 3 are connected via a connecting member 66. The connecting member 66 includes a crossbar 661, which is fixedly connected to the driving end of the first cylinder 41. The crossbar 661 is connected to a vertical rod 662, and one end of the vertical rod 662 facing away from the crossbar 661 is connected to a disk 663. The disk 663 is provided with a through hole, and the linear bearing 65 is fixed in the through hole of the disk 663.

[0075] It should be noted that both the first cylinder 41 and the second cylinder 42 are provided with pressure regulating valves.

[0076] The thrust or pull output of a cylinder is primarily determined by the pressure differential across the piston and the piston's effective area. A pressure regulating valve, installed upstream of the cylinder's air source, precisely adjusts the pressure of the gas entering the cylinder's intake chamber, directly varying the pressure driving the piston and thereby increasing or decreasing the cylinder's output force. Higher pressure increases output force, while lower pressure decreases output force.

[0077] In some feasible embodiments, three guide rods 64 are provided between the first support platform 62 and the second support platform 63. The three guide rods 64 are evenly spaced around the circumference of the driving device 4. Each guide rod 64 is provided with a linear bearing 65, and the three linear bearings 65 are respectively connected and fixed to the disc 663.

[0078] The cylinder body of the first cylinder 41 is provided with a first stopper, such as Figure 6 As shown, the first stopper includes a connecting plate 71 fixedly connected to the cylinder body of the first cylinder 41, and a first U-shaped plate 72 connected to the connecting plate 71. The crossbar 661 of the connecting member 66 is inserted into the first U-shaped plate 72. The connecting plate 71 and the first U-shaped plate 72 can respectively limit the lower and upper displacement limits of the crossbar 661.

[0079] In some feasible embodiments, a threaded hole is provided on the first U-shaped plate 72 at a position relative to the connecting member 66, and a screw 73 is installed in the threaded hole. A threaded hole is provided on the connecting plate 71 at a position relative to the connecting member 66, and a screw 73 is installed in the threaded hole. By adjusting the position of the screw 73 relative to the threaded hole, the range of the first stopper's restriction on the crossbar 661 can be changed.

[0080] A limit plate 8 is provided on the cylinder body of the second cylinder 42, and a second stopper is provided on the second support platform 63. The second stopper is arranged in the moving path of the limit plate 8. The second stopper includes a second U-shaped plate 74, which is fixed to the second support platform 63, and the limit plate 8 is inserted into the second U-shaped plate 74.

[0081] In some feasible embodiments, a threaded hole is provided on the second U-shaped plate 74 relative to the limiting plate 8, into which a screw 73 is disposed. A threaded hole is provided on the second support platform 63 relative to the limiting plate 8, into which a screw 73 is disposed. By adjusting the position of the screw 73 relative to the threaded hole, the range of the second stopper's restriction on the limiting plate 8 can be varied.

[0082] The first support platform 62 is further provided with a sensor 9, which can identify whether the rod 101 is present in the first clamping unit. The sensor 9 can be a laser sensor that integrates emission and reception and triggers a signal based on changes in the intensity of light reflected from an object.

[0083] The gap detection device disclosed in this application can measure the following Figure 7 The test object shown.

[0084] The steps for using the above gap detection device are as follows:

[0085] The first cylinder 41 extends and the second cylinder 42 retracts. At this time, the screw 73 on the first U-shaped plate 72 contacts the cross bar 661, and the screw 73 on the second support platform 63 contacts the limit plate 8. The relative positions of the second clamping assembly 2 and the first clamping assembly 1 are fixed, which facilitates the second clamping assembly 2 and the first clamping assembly 1 to clamp the kit 102 and the rod 101, and reset the displacement sensor 5 to zero.

[0086] After the second clamping assembly 2 and the first clamping assembly 1 clamp the sleeve 102 and the rod 101 respectively, the second cylinder 42 extends to push the sleeve 102 toward the rod 101, so that the end of the rod 101 and the inner bottom of the sleeve 102 are abutted, and the reading S1 of the displacement sensor 5 at this time is recorded.

[0087] The first cylinder 41 and the second cylinder 42 retract simultaneously to pull the sleeve 102 so that its bottom moves away from the end of the rod 101 until it moves to the lower limit of displacement, and the reading S2 of the displacement sensor 5 at this time is recorded.

[0088] The axial clearance between the rod 101 and the sleeve 102 is equal to S2 minus S1.

[0089] It should be noted that before measuring the gap, the positions of the connecting plate 71, the second U-shaped plate 74 and the screws 73 on the second support platform 63 are adjusted according to the gap estimation so that the limit displacement distance of the connecting member 66 and the limit plate 8 is greater than the gap estimation of 0.01 mm, so as to play a protective role and prevent the second clamping assembly 2 from squeezing and deforming the kit 102.

[0090] Specific embodiments are used in the present invention to illustrate the principles and implementation methods of the present invention. The description of the above embodiments is only used to help understand the method of the present invention and its core ideas. At the same time, for those skilled in the art, according to the ideas of the present invention, there may be changes in the specific implementation methods and application scopes. In summary, the contents of this specification should not be understood as limiting the present invention.

Claims

1. A gap measuring device can be used to measure the axial movable distance between movable connection parts, characterized in that: include: A first clamping assembly, comprising a first base having a guide hole and a first clamping unit arranged in a circumferential direction around the guide hole, wherein the first clamping unit can clamp the object to be measured; A second clamping assembly, the second clamping assembly being provided between the first clamping units and being capable of being connected and fixed to the object to be measured; a connecting shaft, the connecting shaft passing through the guide hole and connected to the second clamping assembly, the connecting shaft being connectable to a driving device so as to be driven by the driving device to move axially along the guide hole, the connecting shaft being provided with an axial hole extending therethrough along the axial direction thereof; a displacement sensor connected to the second clamping assembly; A driving device, comprising a first cylinder and a second cylinder disposed in back-to-back relation, wherein the cylinder bodies of the first cylinder and the second cylinder are fixedly connected, a driving end of the first cylinder is connected to the connecting shaft, and a driving end of the second cylinder is connected to a supporting surface; a first support platform, wherein the first support platform is provided with a second through hole, the first base is fixed on the first support platform, and the second through hole is coaxially arranged with the guide hole of the first clamping assembly; a second support platform, the second support platform being arranged on a side of the first support platform away from the first clamping assembly, the second support platform being connected to a driving end of the second cylinder; A guide rod, wherein both ends of the guide rod are connected to the first support platform and the second support platform respectively; A linear bearing, wherein the linear bearing is sleeved on the guide rod; Connecting piece, said connecting piece is connected to said linear bearing, said connecting piece connects the driving end of said first cylinder and the connecting shaft The second clamping assembly includes a second base and a second clamping unit, the second base is connected to the connecting shaft, the second base is provided with a first through hole, and the second clamping unit is provided on the second base around the circumference of the first through hole; The displacement sensor includes an iron core, which is inserted into the shaft hole of the connecting shaft and the first through hole of the second base.

2. The gap measuring device according to claim 1, wherein: The first clamping unit includes a first end connected to the first base, and a second end for clamping the object to be measured, wherein the second end is closer to the clamping position than the first end.

3. The gap measuring device according to claim 2, wherein: A first positioning member is provided at the second end of the first clamping unit, and the first positioning member is configured to match the shape of the object to be measured.

4. The gap measuring device according to claim 1, wherein: A first stopper is included, and the first stopper is arranged on the moving path of the connecting member and can limit the moving range of the connecting member.

5. The gap measuring device according to claim 4, characterized in that: A limiting plate is provided on the cylinder body of the second cylinder, a second stopper is provided on the second supporting platform, and the second stopper is arranged on the moving path of the limiting plate.

6. The gap measuring device according to claim 5, characterized in that: A threaded hole is provided at a position of the first stopper relative to the connecting member, and a screw is provided in the threaded hole; A threaded hole is provided at a position of the second stopper relative to the limiting plate, and a screw is provided in the threaded hole.

7. The gap measuring device according to claim 1, wherein: A sensor is also included. The sensor is disposed on the first supporting platform and can identify whether there is an object to be measured in the first clamping unit.

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