Distance measuring device

Abstract

The utility model discloses a distance measuring device, which solves the technical problem of narrow application range of the existing distance measuring device. The distance measuring device comprises a ruler with length scales, the ruler is provided with at least two moving parts capable of axially sliding and circumferentially rotating, positioning parts used for fixing the positions of the moving parts are arranged between the moving parts and the ruler, and the moving parts are connected with grippers used for abutting against measured parts. According to the technical scheme, the moving piece can move in the axial direction of the scale and can also rotate around the scale in the circumferential direction, the vertical distance between the two measured pieces in the same plane can be measured, the vertical distance between the two measured pieces in different planes can also be measured, and the application range is expanded. By adopting the inventive concept and the preferable technical scheme provided by the utility model, the problem that the distance between two shafts, two shaft holes, one shaft and one hole, the distance between the shaft and the plane, the distance between the hole and the plane and the distance between the two planes cannot be accurately measured in the prior art can be solved.

Description

Technical Field

[0001] The utility model relates to the technical field of distance measuring devices, in particular to a distance measuring device. Background Art

[0002] At present, distance detection plays a vital role in ensuring the quality of product assembly. For example, the measurement of gear center distance is an important step to ensure the quality of gear meshing. When a machine is assembled, due to the limitation of space, it is impossible to measure the distance between two axes, two axis holes, one axis and one hole, axis and plane, hole and plane, and two planes with conventional measuring tools such as vernier calipers and micrometers. Even if it can be measured, the measurement accuracy cannot be guaranteed.

[0003] For example, the utility model patent with the authorization announcement number CN214792876U discloses a device for measuring the center distance between two non-full circles, which can only measure the center distance between two circles and has poor flexibility. Another example is the utility model patent with the authorization announcement number CN217541766U, which discloses a device for measuring the center distance of a gearbox, which belongs to the field of gearbox measuring equipment, has poor versatility, and is also unable to measure the distance between multiple components. Another example is the utility model patent with the authorization announcement number CN205300469U, which discloses a device for measuring the distance between two end faces, which can only be used to measure the distance between parallel end faces. Another example is the utility model patent with the authorization announcement number CN207540469U, which discloses a measuring tool for holes. Although it can be used to measure the distance between two shaft holes, holes and planes, and two planes, it is not only unable to measure the distance between two shafts, one shaft and one hole, or holes and planes, but also unable to measure the vertical distance between non-coplanar components.

[0004] Therefore, it is urgent to design a distance measuring device with a wide range of applications.

[0005] It should be particularly noted that the above technical information is only intended to deepen the understanding of the overall background technology of the present utility model, and should not be regarded as admitting or implying in any form that the above technical information constitutes the prior art already known to those skilled in the art. Utility Model Content

[0006] In view of the deficiencies in the above-mentioned background technology, the utility model provides a distance measuring device, which solves the technical problem that the existing distance measuring devices have a narrow application range.

[0007] The technical solution of this application is:

[0008] A distance measuring device includes a ruler with a length scale, the ruler is provided with at least two movable parts that can slide axially and rotate circumferentially, a positioning part for fixing the position of the movable part is provided between the movable part and the ruler, and the movable part is connected with a gripper for abutting against a measured part. The movable part in the technical solution can move axially along the ruler and rotate circumferentially around the ruler, so that it can measure the vertical distance between two measured parts in the same plane and the vertical distance between two measured parts in different planes, thereby expanding the scope of application. When in use, the axial translation or circumferential rotation of the movable part can be achieved by loosening the positioning part, and the fixing of the movable part can be achieved by reversely operating the positioning part. Among them, the rotation of the movable part is to enable the gripper to abut against the measured parts in different planes, and the translation of the movable part is to read the scale on the ruler, so as to obtain the distance between the two movable parts, that is, the vertical distance between the two measured parts. It should be noted that in this technical solution, the gripper has the same degrees of freedom through the axial sliding freedom and circumferential rotation freedom of the moving part along the scale. In addition, the entire gripper cannot swing or rotate relative to the moving part, and the local components in the gripper 7 can have corresponding degrees of freedom.

[0009] Furthermore, the movable part is connected to the gripper through a retractable connecting rod, so that the gripper can be retracted and retracted as the measuring environment changes, which can further expand the scope of application of the spacing measurement. It can not only measure the vertical distance between two measured parts in different planes, but also measure the vertical distance between two measured parts at different heights in the same plane.

[0010] Furthermore, one end of the telescopic connecting rod is fixedly connected or welded or riveted or plugged or clamped with the moving part by a bolt group, and the other end of the telescopic connecting rod is fixedly connected or welded or riveted or plugged or clamped with the gripper by a fixing pin. That is, there are various specific connection methods, and the essence is to ensure that the two ends of the telescopic connecting rod cannot rotate relative to the moving part and the gripper, respectively, so that the gripper as a whole can only move synchronously with the axial sliding and circumferential rotation of the moving part relative to the scale without other degrees of freedom. Of course, the gripper itself can have freedom.

[0011] Furthermore, the gripper includes an internal clamping gripper and / or an external clamping gripper, and the internal clamping gripper and the external clamping gripper are respectively connected to different positioning members, and the internal clamping gripper and the external clamping gripper are used to respectively abut two planes to be measured, thereby measuring the vertical distance between the two planes.

[0012] Furthermore, the gripper includes a base rotatably provided with a driving gear and a driven gear, a pair of driven gears are provided and meshed with each other, each of the driven gears is connected to a gripper, the driving gear meshes with one of the driven gears, and when the driving gear drives the driven gear to rotate, the two grippers rotate synchronously and approach or move away from each other. The present technical solution provides another gripper, which is a gripper having two grippers that approach or move away from each other, and can be used to measure the vertical distance between two shaft holes, two shafts, or one shaft and one hole. When the present technical solution is used in combination with the above-mentioned internal clamping gripper or external clamping gripper, that is, each moving part is connected to different types of grippers, it can measure both the vertical distance between the shaft and the plane and the vertical distance between the hole and the plane.

[0013] Furthermore, each of the gripping heads forms a parallelogram mechanism with the base through two parallel connecting rods, and the protruding portion of the gripping head protruding from the parallelogram mechanism is used to abut the measured piece, that is, the two gripping heads in one gripper can respectively achieve synchronous action through two parallelogram mechanisms, that is, synchronously approach to clamp the shaft or loosen the shaft hole, and synchronously move away to loosen the shaft or tighten the shaft hole.

[0014] Furthermore, the edge profile of the protrusion is an arc shape or a straight line shape. When the edge profile of the protrusion is an arc shape, the stability of the grasping component when it is a shaft can be further improved, but due to the limitation of the shaft diameter, a gripper of one specification cannot meet the measurement requirements of all shaft diameters. When the edge profile of the protrusion is a straight line, although the stability when grasping the shaft is not as good as the arc shape, it has a wide range of applications and is not limited by the shaft diameter.

[0015] Furthermore, the gripping head is hinged to the two connecting rods through two connecting pins, one of which is synchronously connected to the driven gear, and the other is hinged to the base through the connecting pin. That is, one of the connecting rods is directly fixedly connected to the driven gear, and there are many ways of fixed connection, such as welding, bolting, clamping, riveting, etc., or the connecting rod is indirectly fixedly connected to the driven gear through the driving shaft of the driven gear, and the two ends of the other connecting rod are respectively hinged to the gripping head and the base.

[0016] Furthermore, the driving gear is rotatably connected to the base via a driving shaft, and a locking nut for locking the driving shaft from rotating is disposed on at least one side of the base.

[0017] Furthermore, the driven gears arranged in pairs and the grasping heads arranged in pairs are symmetrically arranged with respect to the axial mid-section of the moving member.

[0018] Compared with the prior art, the distance measuring device provided by the utility model solves the technical problem that the existing distance measuring devices have a narrow application range. Compared with the prior art, the inventive concept and the preferred technical solution provided by the utility model can solve the problem that the distance between two axes, two axis holes, one axis and one hole, an axis and a plane, a hole and a plane, and two planes in the prior art cannot be accurately measured. At the same time, when the space is limited, the technical solution provided by the utility model can also achieve accurate distance measurement, which has important application value for ensuring assembly quality. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the embodiments of the present utility model, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0020] Figure 1 It is a structural form of a distance measuring device;

[0021] Figure 2 for Figure 1 A magnified view of the middle gripper;

[0022] Figure 3 for Figure 2 Side view at A in the middle;

[0023] Figure 4 An application state diagram of a distance measuring device;

[0024] Figure 5 Another application state diagram of the distance measuring device;

[0025] Figure 6 Another application state diagram of the distance measuring device;

[0026] Figure 7 for Figure 1 Another structural form of the middle gripper;

[0027] Description of Figure Numbers:

[0028] Moving part 1, scale 2, fastener 3, bolt group 4, telescopic connecting rod 5, fixing pin 6, gripper 7, base 8, driving gear 9, driven gear 10, connecting rod 11, gripper head 12, connecting pin 13, locking nut 14, driving shaft 15;

[0029] Internal clamping gripper 71 and external clamping gripper 72. DETAILED DESCRIPTION

[0030] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the core concept of the utility model and the following embodiments, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0031] The present application provides these embodiments to make the present application thorough and complete, and to fully express the scope of the present application to those skilled in the art. It should be noted that unless otherwise specifically stated, the relative arrangement of the parts and steps, the composition of the materials, the numerical expressions and the numerical values ​​set forth in these embodiments should be interpreted as being merely exemplary, and not as limiting.

[0032] It should be noted that, in the description of this application, unless otherwise specified, the meaning of "several" is greater than or equal to two; the terms "upper", "lower", "left", "right", "inner", "outer", "axial", "radial" and the like indicate positions or positional relationships only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific position, be constructed and operated in a specific position, and therefore cannot be understood as a limitation on this application. When the absolute position of the object being described changes, the relative positional relationship may also change accordingly.

[0033] In addition, the words "first", "second" and similar words used in this application do not indicate any order, quantity or importance, but are only used to distinguish different parts. "Vertical" does not mean vertical in the strict sense, but is within the tolerance range. "Parallel" does not mean parallel in the strict sense, but is within the tolerance range. "Include" or "comprising" and similar words mean that the elements before the word include the elements listed after the word, and do not exclude the possibility of including other elements.

[0034] It should also be noted that in the description of this application, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be internal communication between two components. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to the specific circumstances. When a specific device is described as being located between a first device and a second device, there may or may not be an intermediate device between the specific device and the first device or the second device.

[0035] All terms used in this application have the same meaning as those understood by those of ordinary skill in the art to which this application belongs, unless otherwise specifically defined. It should also be understood that terms defined in general dictionaries, such as general dictionaries, should be interpreted as having a meaning consistent with their meaning in the context of the relevant technology, and should not be interpreted in an idealized or extremely formal sense, unless explicitly defined herein.

[0036] Technologies, methods, and equipment known to ordinary technicians in the relevant art may not be discussed in detail, but where appropriate, the technologies, methods, and equipment should be considered part of the specification.

[0037] A distance measuring device, such as Figure 1 As shown, it includes a ruler 2 with a length scale, and the structure of the ruler 2 is various, such as a cylindrical structure, a polygonal structure, or an elliptical cross-section, etc.

[0038] At least two movable parts 1 capable of axial sliding and circumferential rotation are arranged on the ruler 2. When the ruler 2 is a cylindrical structure, the movable part 1 preferably adopts a movable sleeve with a ring-shaped inner wall, and of course, it can also be a movable sleeve with a non-closed arc-shaped inner wall; similarly, when the cross-section of the ruler 2 is other shapes, the inner wall of the movable part 1 is set to a shape adapted thereto, as long as it can ensure that the movable part 1 can slide axially along the ruler 2.

[0039] As for the freedom of the circumferential rotation of the moving member 1, it is preferred that the cross-sectional shape of the scale 2 is circular, so that the moving sleeve can directly rotate circumferentially relative to the scale 2. Of course, even if the cross-sectional shape of the scale 2 is not circular, the rotation of the moving member 1 relative to the scale 2 can be achieved, that is, the moving member 1 is set as a double-layer structure nested with each other, and the two-layer structure can rotate relative to each other. When the outer layer structure rotates relative to the inner layer structure, the rotation relative to the scale 2 is also achieved.

[0040] A positioning member 3 for fixing the position of the moving member 1 is provided between the moving member 1 and the scale 2. The positioning member 3 also has a variety of options, such as a fastening screw that directly passes through the moving member 1 and presses against the outer wall of the scale 2, or a wedge that is clamped between the inner wall of the moving member 1 and the outer wall of the scale 2, and so on.

[0041] The movable member 1 is connected with a gripper 7 for abutting against the measured member. When the gripper 7 abuts against the measured member, a reading can be taken on the ruler 2, and then the vertical distance between the measured members corresponding to the two grippers 7 can be obtained.

[0042] It should be noted that the moving member 1 in the present technical solution can not only move axially along the scale 2, but also rotate circumferentially around the scale 2, so that the vertical distance between two measured parts in the same plane can be measured, and the vertical distance between two measured parts in different planes can be measured, thereby expanding the scope of application. When in use, the axial translation or circumferential rotation of the moving member 1 can be achieved by loosening the positioning member 3, and the fixing of the moving member 1 can be achieved by reversely operating the positioning member 3. Among them, the rotation of the moving member 1 is to enable the gripper 7 to abut against the measured parts in different planes, and the translation of the moving member 1 is to read the scale on the scale 2, so as to obtain the distance between the two moving members 1, that is, the vertical distance between the two measured parts. In the present technical solution, the gripper 7 has the same degree of freedom through the axial sliding freedom and circumferential rotation freedom of the moving member 1 along the scale 2. In addition, the gripper 7 cannot swing or rotate relative to the moving member 1.

[0043] Based on the above embodiment, as a preferred implementation of the distance measuring device, Figure 1 , Figure 4 , Figure 5 As shown, the movable part 1 is connected to the gripper 7 via a retractable connecting rod 5, so the gripper 7 can be retracted and extended as the measuring environment changes, which can further expand the applicable scope of the spacing measurement. It can not only measure the vertical distance between two measured parts in different planes, but also measure the vertical distance between two measured parts at different heights in the same plane.

[0044] Based on the above embodiment, as a preferred implementation of the distance measuring device, Figure 1 , Figure 4 , Figure 5 , Figure 6 As shown, one end of the telescopic connecting rod 5 is fixedly connected or welded or riveted or plugged or clamped with the moving part 1 through a bolt group 4, and the other end of the telescopic connecting rod 5 is fixedly connected or welded or riveted or plugged or clamped with the gripper 7 through a fixing pin 6. That is, there are various specific connection methods, and the essence is to ensure that the two ends of the telescopic connecting rod 5 are respectively non-rotatable relative to the moving part 1 and the gripper 7, so that the gripper 7 as a whole can only move synchronously with the axial sliding and circumferential rotation of the moving part 1 relative to the scale 2, without other degrees of freedom. Of course, the local components in the gripper 7 can have corresponding degrees of freedom.

[0045] Based on the above embodiment, as a preferred implementation of the distance measuring device, Figure 6As shown, the gripper 7 includes an inner clamping gripper 71 and / or an outer clamping gripper 72, and the inner clamping gripper 71 and the outer clamping gripper 72 are respectively connected to different positioning members 3, and the inner clamping gripper 71 and the outer clamping gripper 72 are used to respectively abut two planes to be measured, thereby measuring the vertical distance between the two planes.

[0046] Based on the above embodiment, as another preferred implementation of the distance measuring device, Figure 2 As shown, the gripper 7 includes a base 8 rotatably provided with a driving gear 9 and a driven gear 10, wherein the driven gears 10 are provided in a pair and mesh with each other, each of the driven gears 10 is connected to a gripper 12, and the driving gear 9 meshes with one of the driven gears 10. When the driving gear 9 drives the driven gears 10 to rotate, the two grippers 12 rotate synchronously and approach or move away from each other.

[0047] The present technical solution provides another gripper 7, which is a gripper having two gripping heads 12 that are close to or far from each other, and can be used to measure the vertical distance between two shaft holes, two shafts, or one shaft and one hole. When the present technical solution is used in combination with the above-mentioned internal clamping gripper 71 or external clamping gripper 72, that is, each moving part 1 is connected to a different type of gripper 7, it can measure the vertical distance between the shaft and the plane, and the vertical distance between the hole and the plane.

[0048] On the basis of the above embodiments, as a preferred implementation mode of the distance measuring device, each of the gripping heads 12 forms a parallelogram mechanism with the base 8 through two parallelly arranged connecting rods 11, and the protruding portion 121 of the gripping head 12 protruding from the parallelogram mechanism is used to abut the measured piece, that is, the two gripping heads 12 in a gripper 7 can respectively realize synchronous action through two parallelogram mechanisms, that is, synchronously approach to clamp the shaft or loosen the shaft hole, and synchronously move away to loosen the shaft or tighten the shaft hole.

[0049] Based on the above embodiment, as a preferred implementation of the distance measuring device, Figure 7 As shown, the edge profile of the protrusion 121 is arc-shaped or straight-line-shaped. When the edge profile of the protrusion is arc-shaped, the stability of the grasping component when it is a shaft can be further improved, but due to the limitation of the shaft diameter, a gripper of one specification cannot meet the measurement requirements of all shaft diameters. When the edge profile of the protrusion is straight-line, although the stability when grasping the shaft is not as good as the arc-shaped one, it has a wide range of applications and is not limited by the shaft diameter.

[0050] On the basis of the above embodiment, as a preferred implementation of the distance measuring device, the gripping head 12 is respectively hinged to the two connecting rods 11 through two connecting pins 13, one of the connecting rods 11 is synchronously connected to the driven gear 10, and the other connecting rod 11 is hinged to the base 8 through the connecting pin 13. That is, one of the connecting rods 11 is directly fixedly connected to the driven gear 10, and there are many ways of fixed connection, such as welding, bolting, clamping, riveting, etc., or the connecting rod 11 is indirectly fixedly connected to the driven gear 10 through the driving shaft of the driven gear 10, and the two ends of the other connecting rod are respectively hinged to the gripping head 12 and the base 8.

[0051] Based on the above embodiment, as a preferred implementation of the distance measuring device, Figure 2 and Figure 3 As shown, the driving gear 9 is rotatably connected to the base 8 via a driving shaft 15 , and a locking nut 15 for locking the driving shaft 15 from rotating is disposed on at least one side of the base 8 .

[0052] On the basis of the above embodiment, as a preferred implementation of the distance measuring device, the driven gears 10 arranged in pairs and the gripping heads 12 arranged in pairs are symmetrically arranged with respect to the axial mid-section of the moving member 1 .

[0053] As a preferred implementation of the distance measuring device, Figures 1 to 7 As shown in Figure 1, the device includes a moving part 1, a scale 2, a fastener 3, a bolt group 4, a telescopic connecting rod 5, a fixing pin 6, a gripper 7, etc., the scale 2 is engraved with scales, and the telescopic connecting rod 5 has a telescopic function. The moving part 1 is sleeved on the scale 2, the moving part 1 is locked on the scale 2 by the fastener 3, the telescopic connecting rod 5 and the moving part 1 are connected by bolts and nuts, and the telescopic connecting rod 5 and the gripper 7 are connected by bolts and nuts.

[0054] The working principle of the device is to clamp the shaft, hole, plane, etc. through the gripper 7, move or rotate the moving part 1 to the appropriate position, lock the fastening screw 4, and then read the scale on the ruler 2 to obtain the distance.

[0055] The structure of the gripper is as follows Figure 2 and Figure 3As shown, the gripper is composed of a base 8, a driving gear 9, a driven gear 10, a connecting rod 11, a gripping head 12, a driving shaft 15, a locking nut 14, and a connecting pin 13. The connecting rod 11 has a telescopic function. The connection between the driving shaft 15 and the driving gear 9 is welded, and the driving shaft 15 rotates around the base 8. One end of the driving shaft 15 has a thread, and is fastened by the locking nut 14 to ensure the axial positioning of the driving shaft and the locking of the rotational freedom of the driving gear. The connection between the driven gear 10 and the connecting rod 11 is welded, and the driven gear 10 and the base 8 are connected by the connecting pin 13, and the two rotate around the connecting pin 13 together. The connecting rod 11, the gripping head 12 and the base 8 are connected by the connecting pin 13, and they rotate around the connecting pin 13 with each other.

[0056] The working principle of the gripper is to rotate the driving shaft 15 to drive the driving gear 9 to rotate, thereby driving the driven gear 10 to rotate, and the driven gear 10 rotates to drive the connecting rod 11 to rotate, thereby realizing the opening and contraction of the gripper head.

[0057] (1) When measuring two axes, the working scenario of the device is as follows: Figure 4 As shown, the moving member 1 has the freedom of movement and rotation in the axial direction of the ruler. When measuring the distance between the centers of the two axes, the distance in the axial movement and rotation angle directions of the ruler can be measured by moving and rotating the moving sleeve.

[0058] (2) When measuring two-axis holes, the working scenario of the device is as follows: Figure 5 As shown, the gripper 12 needs to be replaced with an external card gripper, and the movable part 1 has the freedom of movement and rotation in the axial direction of the ruler. When measuring the distance between the centers of the two axial holes, the distance in the axial movement and rotation directions of the ruler can be measured by moving and rotating the movable sleeve.

[0059] (3) When measuring two planes, the working scenario of the device is as follows: Figure 6 As shown, the gripper 7 needs to be replaced with an inner clamping gripper 71 and an outer clamping gripper 72. The movable part 1 has the freedom of movement and rotation in the axial direction of the scale. When measuring the distance between two planes, the distance in the axial movement and rotation directions of the scale can be measured by moving and rotating the movable sleeve.

[0060] (4) When measuring a shaft and a hole, a shaft and a plane, or a hole and a plane, you only need to combine the three working scenarios (1), (2), and (3).

[0061] The parts not described in detail in the present invention are all conventional technical means known to those skilled in the art.

[0062] The above content shows and describes the basic principle, main features and beneficial effects of the utility model. The above description is only a preferred embodiment of the utility model and is not intended to limit the utility model. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the utility model shall be included in the protection scope of the utility model.

Claims

1. A distance measuring device, comprising a ruler (2) with a length scale, characterized in that: The scale (2) is provided with at least two movable members (1) capable of axial sliding and circumferential rotation, a positioning member (3) for fixing the position of the movable member (1) is provided between the movable member (1) and the scale (2), and the movable member (1) is connected with a gripper (7) for abutting against a measured member.

2. The distance measuring device according to claim 1, characterized in that: The moving part (1) is connected to the gripper (7) via a telescopic connecting rod (5).

3. The distance measuring device according to claim 2, characterized in that: One end of the telescopic connecting rod (5) is fixedly connected or welded or riveted or plugged or clamped to the moving part (1) via a bolt group (4), and the other end of the telescopic connecting rod (5) is fixedly connected or welded or riveted or plugged or clamped to the gripper (7) via a fixing pin (6).

4. The distance measuring device according to any one of claims 1 to 3, characterized in that: The gripper (7) comprises an internal gripper (71) and / or an external gripper (72), and the internal gripper (71) and the external gripper (72) are respectively connected to different positioning members (3).

5. The distance measuring device according to any one of claims 1 to 3, characterized in that: The gripper (7) comprises a base (8) rotatably provided with a driving gear (9) and a driven gear (10), wherein a pair of driven gears (10) are provided and mesh with each other, each of the driven gears (10) is connected to a gripper (12), and the driving gear (9) meshes with one of the driven gears (10). When the driving gear (9) drives the driven gear (10) to rotate, the two grippers (12) rotate synchronously and approach or move away from each other.

6. The distance measuring device according to claim 5, characterized in that: Each of the gripping heads (12) forms a parallelogram mechanism with the base (8) through two parallelly arranged connecting rods (11), and a protruding portion (121) of the gripping head (12) protruding from the parallelogram mechanism is used to abut against a measured object.

7. The distance measuring device according to claim 6, characterized in that: The edge profile of the protruding portion (121) is in the shape of an arc or a straight line.

8. The distance measuring device according to claim 6 or 7, characterized in that: The grab head (12) is hinged to the two connecting rods (11) via two connecting pins (13), one connecting rod (11) is synchronously connected to the driven gear (10), and the other connecting rod (11) is hinged to the base (8) via the connecting pin (13).

9. The distance measuring device according to claim 8, characterized in that: The driving gear (9) is rotatably connected to the base (8) via a driving shaft (15); at least one side of the base (8) is provided with a locking nut (14) for locking the driving shaft (15) from rotating.

10. The distance measuring device according to any one of claims 6, 7 and 9, characterized in that: The driven gears (10) arranged in pairs and the gripping heads (12) arranged in pairs are both symmetrically arranged with respect to the axial mid-section of the moving member (1).

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