Multi-functional caliper

Abstract

The application discloses a multifunctional caliper, which is used for stably fixing a to-be-measured object when the to-be-measured object needs to be placed and measured vertically, and the to-be-measured object is placed on a ring-shaped convex and two small-diameter portions of a clamping sleeve, and then the clamping sleeve clamps and fixes the to-be-measured object, so that the to-be-measured object is stably fixed; the interval between a first seat body and a second seat body can be adjusted through an adjusting mechanism, and a wider to-be-measured object can be placed; meanwhile, during the interval changing process between the first seat body and the second seat body, the hinge points (the positions of the hinge shafts) of a first connecting arm and a second connecting arm are located in the middle of a laser emitting device and a receiving device, so that the distance between the to-be-measured object and the laser emitting device or the receiving device is prevented from being too small; meanwhile, a mounting bracket and a placing wheel are prevented from rotating during the movement of the first connecting arm and the second connecting arm, so that the horizontal state is maintained.

Description

Technical Field

[0001] This invention relates to the field of laser diameter measuring instruments, and particularly to a multifunctional diameter measuring instrument. Background Technology

[0002] Laser diameter gauges are online diameter measuring instruments that use laser scanning. They can be widely used in industries such as cables, enameled wires, optical fibers, micro-drawn wires, and various pipes and rods. The structure of a laser diameter gauge includes a base, a laser emitting device mounted on the base, a receiving device mounted on the base, and a support device located on the front and back sides of the base, positioning the object to be measured between the laser emitting and receiving devices. For example, the attached drawings of Chinese Patent No. CN306449831S, authorized on April 9, 2021, entitled "Laser Diameter Gauge (Unidirectional High Precision 100A)," are shown.

[0003] In the use of laser diameter measuring instruments, for example, if the cross-section of some objects to be measured is rectangular, when measuring the length of the cross-section of the object to be measured, the object to be measured needs to be placed upright on two support devices. When measuring the width of the cross-section of the object to be measured, the object to be measured needs to be placed horizontally on two support devices. The following disadvantages exist in the two measurement processes: (1) When the object to be measured is placed upright on two support devices, it is unstable and requires manual assistance to level it, which is inconvenient to use. (2) When the length of the cross-section of the object to be measured is long, it may protrude from the measurement range of the laser emitting device and the receiving device when placed upright, and may collide with the laser emitting device and the receiving device when placed horizontally, which is also inconvenient to use. Summary of the Invention

[0004] The purpose of this invention is to provide a multifunctional diameter measuring instrument that facilitates measurement.

[0005] The above-mentioned technical objective of the present invention is achieved through the following technical solution: a multifunctional diameter measuring instrument, comprising a base, a laser emitting device disposed on the base, a receiving device disposed on the base, and a support device disposed on the front and rear sides of the base. The base includes a first seat for mounting the laser emitting device, a second seat for mounting the receiving device and telescopically disposed with respect to the first seat, and an adjustment mechanism disposed between the first seat and the second seat. The support device includes a first slide rail disposed on the side of the first seat located on the laser receiving device and extending vertically, a second slide rail disposed on the side of the second seat located on the receiving device and extending vertically, a first slider vertically disposed on the first slide rail, a second slider vertically disposed on the second slide rail, and a component hinged at one end to the first slide rail. A first connecting arm is mounted on a body and hinged at one end to a second slider; a second connecting arm is hinged at one end to a second body and at the other end to a first slider; a hinge shaft is disposed in the middle of the first connecting arm and passes through the second connecting arm to achieve hinge; a mounting bracket is disposed on the hinge shaft; and a clamping and resting wheel is disposed on the mounting bracket. The clamping and resting wheel includes an intermediate shaft with an annular protrusion in the middle; two sleeves sleeved from both ends of the intermediate shaft with scanning surfaces in the shape of "L"; two first compression springs embedded from both ends of the intermediate shaft; and two annular seats threaded to both ends of the intermediate shaft. The outer diameter of the smaller portion of the outer diameter of the sleeve is the same as the outer diameter of the annular protrusion. When the two sleeves abut against the annular protrusion, the outer diameter of the larger portion of the outer diameter of the two sleeves is the same as the outer diameter of the two annular seats.

[0006] A further configuration of the present invention is as follows: a telescopic sleeve is provided on the end face of the first base near the second base, which is telescopically connected to the second base; a mounting groove is provided at the bottom of the second base corresponding to the telescopic sleeve; a through groove is provided at the top of the mounting groove; the adjustment mechanism includes a limiting tooth groove provided at the bottom of the telescopic sleeve; a lifting seat that is raised and lowered in the mounting groove; a limiting rack provided on the upper surface of the lifting seat and passing through the through groove to engage with the limiting tooth groove; and a second compression spring provided between the mounting groove and the lifting seat and driving the limiting rack and the limiting tooth groove to separate; when the base is placed on the table, the bottom of the lifting seat is also placed on the table, and the limiting rack engages with the limiting tooth groove.

[0007] A further configuration of the present invention is as follows: the top of the mounting groove is provided with a first threaded hole on both sides of the through groove; the lifting seat is provided with a second threaded hole corresponding to the first threaded hole and having a thread direction opposite to that of the first threaded hole; the upper end of the second compression spring is provided with a first threaded connector threaded into the first threaded hole; and the lower end of the second compression spring is provided with a second threaded connector threaded into the second threaded hole.

[0008] A further feature of the present invention is that a limit knob bolt is threadedly connected to the lifting seat, and a limit hole is provided inside the mounting groove. When the limit knob bolt is embedded in the limit hole, the limit rack and the limit tooth groove mesh with each other.

[0009] A further feature of the present invention is that: a first annular groove is provided on the end face of the annular seat near the jacket, and a second annular groove corresponding to the first annular groove is provided on the end face of the jacket near the annular seat, and the two ends of the first compression spring are respectively embedded in the first annular groove and the second annular groove.

[0010] A further feature of the present invention is that the mounting bracket is H-shaped, the middle part of the mounting bracket is rotatably connected to the hinge shaft, the two ends of the intermediate shaft of the clamping and supporting wheel pass through the two ends of the upper part of the mounting bracket and are tightened and fixed by nuts through the protruding ends, the two ends of the lower part of the mounting bracket are rotatably connected to a roller with an annular embedded groove in the middle having a scanning surface in the shape of a "V", and a rotation mechanism is provided between the hinge shaft and the mounting bracket to allow the mounting bracket to rotate within a 180-degree range so that the clamping and supporting wheel faces upward or the roller faces upward.

[0011] A further configuration of the present invention includes: a connecting shaft with external threads at its end is provided on the hinge shaft; the mounting bracket is rotatably connected to the connecting shaft at its center; two slots are provided on the end face of the hinge shaft near the connecting shaft; the rotation mechanism includes a locking block disposed on the mounting bracket and embedded in the two slots, a third compression spring sleeved on the connecting shaft, and an adjusting sleeve threaded to the end of the connecting shaft; when the positions of the two locking blocks embedded in the slots are interchanged, the mounting bracket rotates 180 degrees.

[0012] A further provision of the present invention is that when the distance between the first seat and the second seat is at its closest point, the height of the first connecting arm and the second connecting arm is lower than the top height of the clamping support wheel within the orthogonal projection range of the area between the laser emitting device and the receiving device.

[0013] In summary, the beneficial effects of this invention are:

[0014] 1. When a square-shaped object to be measured needs to be placed upright, the clamp moves towards the annular seat by overcoming the elastic force of the first compression spring. This allows the object to be placed on the annular protrusion and the two smaller outer diameter parts of the clamp. Then, during the return process of the first compression spring, the clamp holds and fixes the object, thus achieving stable fixation. In addition, if the thickness of the object to be measured cannot be less than the thickness of the annular protrusion and the sum of the thickness of the two smaller outer diameter parts of the clamp, some pads need to be added for auxiliary use during clamping.

[0015] If the object to be tested may bump into the laser emitting device or receiving device when placed horizontally, the distance between the first and second seats can be adjusted by the adjustment mechanism, thereby adjusting the distance between the laser emitting device and the receiving device, so that a wider object to be tested can be placed.

[0016] Meanwhile, during the change of the distance between the first and second seats, the first and second sliders of the support device move up and down along the first and second slide rails respectively, so that the hinge points (the positions of the hinge axes) of the first and second connecting arms are located in the middle of the laser emitting device and the receiving device, thereby avoiding the distance between the object to be tested and the laser emitting device or the receiving device being too small; at the same time, the mounting bracket and the support wheel will not rotate during the movement of the first and second connecting arms, thereby maintaining a horizontal state;

[0017] 2. When it is necessary to adjust the distance between the first seat and the second seat, the second seat can be lifted, thereby canceling the interaction force between the bottom of the lifting seat and the table. The lifting seat moves downward under the combined action of gravity and the elastic force of the second compression spring, so that the limiting rack and the limiting tooth groove are separated, thereby realizing the adjustment of the length of the telescopic sleeve embedded in the second seat. After adjustment, the second seat is lowered, so that the bottom of the lifting seat rests on the table, and the limiting rack and the limiting tooth groove are engaged.

[0018] 3. Since the threads of the first and second threaded holes are in opposite directions, when installing the second compression spring, rotating the second compression spring allows the first and second threaded connectors to be simultaneously connected to the first and second threaded holes, respectively, which facilitates installation. Simultaneously, during installation, the second compression spring needs to be compressed to a certain extent. This ensures that the first and second threaded connectors remain pressed against the first and second threaded holes, making connection even more convenient.

[0019] 4. In some users' use, the diameter measuring instrument is not placed directly on the table but is fixed by a bracket. At this time, the bottom of the lifting seat hangs down naturally under the action of gravity and elasticity. When the limit knob bolt is embedded in the limit hole, the limit rack and the limit tooth groove are kept in a meshing state.

[0020] 5. The cross-section of the object to be measured is usually not only square, but more often circular. In this case, when measuring the object with a circular cross-section, the mounting bracket is rotated 180 degrees by a rotating mechanism, so that the two ends of the object with a circular cross-section can be directly placed on two rollers with annular embedded grooves in the middle, which facilitates the measurement.

[0021] Meanwhile, if the diameter of the object to be measured is large and has a circular cross-section, the first and second seats can be moved further apart. At this time, the height of the rollers will gradually decrease, thereby reducing the height of the object after it is placed, so as to prevent the top of the object from exceeding the measurement area.

[0022] 6. During the process of rotating the mounting bracket 180 degrees, by pulling the mounting bracket outward, the mounting bracket overcomes the elastic force of the third compression spring and causes the locking block to disengage from the slot. Thus, after rotating 180 degrees, the locking block is re-embedded in the slot for limiting, thereby achieving a 180-degree rotation of the mounting bracket.

[0023] 7. When the distance between the first seat and the second seat is at its closest point, in the orthographic projection range between the laser emitting device and the receiving device, the height of the first connecting arm and the second connecting arm is lower than the top height of the clamping rest wheel, thereby preventing the object to be tested from interfering with the first connecting arm and the second connecting arm when placed on the rest wheel. Attached Figure Description

[0024] Figure 1 This is a schematic diagram of the structure of the present invention;

[0025] Figure 2 This is a partial connection diagram between the first and second base bodies of the base in this invention;

[0026] Figure 3 This is a partial structural cross-sectional view of the adjustment mechanism in this invention (at the limit knob bolt);

[0027] Figure 4 This is another partial structural cross-sectional view of the adjusting mechanism in this invention (at the second compression spring);

[0028] Figure 5 This is a schematic diagram of the structure of the placement device in this invention;

[0029] Figure 6 yes Figure 5 A schematic diagram of a local structure based on the basic structure.

[0030] Reference numerals: 1. Base; 11. First seat; 111. Telescopic sleeve; 12. Second seat; 121. Mounting groove; 122. Through groove; 123. First threaded hole; 124. Limiting hole; 13. Adjusting mechanism; 131. Limiting tooth groove; 132. Lifting seat; 1321. Second threaded hole; 133. Limiting rack; 134. Second compression spring; 135. First threaded connector; 136. Second threaded connector; 137. Limiting knob bolt; 2. Laser emitting device; 3. Receiving device; 4. Supporting device; 41. First slide rail; 4 2. Second slide rail; 43. First slider; 44. Second slider; 45. First connecting arm; 46. Second connecting arm; 47. Hinge shaft; 471. Connecting shaft; 472. Slot; 48. Mounting bracket; 49. Clamping and resting wheel; 491. Intermediate shaft; 4911. Annular protrusion; 492. Jacket; 4921. Second annular groove; 493. First compression spring; 494. Annular seat; 4941. First annular groove; 410. Roller; 411. Rotating mechanism; 4111. Locking block; 4112. Third compression spring; 4113. Adjusting sleeve. Detailed Implementation

[0031] The present invention will be further described in detail below with reference to the accompanying drawings.

[0032] Example: A multifunctional diameter measuring instrument, such as Figure 1 As shown, it includes a base 1, a laser emitting device 2 mounted on the base 1, a receiving device 3 mounted on the base 1, and a support device 4 mounted on the front and rear sides of the base 1.

[0033] like Figure 1 and Figure 2 As shown, the base 1 includes a first base 11 for mounting the laser emitting device 2, a second base 12 that is telescopically connected to the first base 11 and for mounting the receiving device 3, and an adjustment mechanism 13 disposed between the first base 11 and the second base 12.

[0034] like Figures 2 to 4As shown, a telescopic sleeve 111 is provided on the end face of the first base 11 near the second base 12, which is telescopically connected to the second base 12. The bottom of the second base 12 corresponds to the mounting groove 121 at the telescopic sleeve 111. A through groove 122 is provided on the top of the mounting groove 121. The adjustment mechanism 13 includes a limiting tooth groove 131 provided at the bottom of the telescopic sleeve 111, a lifting seat 132 that is lifted and lowered in the mounting groove 121, a limiting rack 133 that is provided on the upper surface of the lifting seat 132 and passes through the through groove 122 to engage with the limiting tooth groove 131, and a second compression spring 134 that is provided between the mounting groove 121 and the lifting seat 132 and drives the limiting rack 133 and the limiting tooth groove 131 to separate. When the base 1 is placed on the table, the bottom of the lifting seat 132 is also placed on the table, and the limiting rack 133 engages with the limiting tooth groove 131. Meanwhile, the lifting seat 132 is threadedly connected to a limit knob bolt 137, and a limit hole 124 is provided inside the mounting groove 121. When the limit knob bolt 137 is embedded in the limit hole 124, the limit rack 133 and the limit groove 131 mesh.

[0035] like Figure 2 and Figure 4 As shown, a first threaded hole 123 is provided on the top of the mounting groove 121 on both sides of the through groove 122. A second threaded hole 1321 with the opposite thread direction to the first threaded hole 123 is provided on the lifting seat 132. A first threaded connector 135 is provided at the upper end of the second compression spring 134 and is threaded into the first threaded hole 123. A second threaded connector 136 is provided at the lower end of the second compression spring 134 and is threaded into the second threaded hole 1321.

[0036] like Figure 1 and Figure 5 As shown, the mounting device 4 includes a first slide rail 41 located on the side of the first base 11 and extending vertically along the side of the laser receiving device 3, a second slide rail 42 located on the side of the second base 12 and extending vertically along the side of the receiving device 3, a first slider 43 that is raised and lowered on the first slide rail 41, a second slider 44 that is raised and lowered on the second slide rail 42, a first connecting arm 45 with one end hinged to the first base 11 and the other end hinged to the second slider 44, a second connecting arm 46 with one end hinged to the second base 12 and the other end hinged to the first slider 43, a hinge shaft 47 located in the middle of the first connecting arm 45 and passing through the second connecting arm 46 to achieve hinge, a mounting bracket 48 located on the hinge shaft 47, a clamping and mounting wheel 49 located on the mounting bracket 48, and a roller 410.

[0037] like Figure 5 and Figure 6As shown, the mounting bracket 48 is H-shaped, with the middle part of the mounting bracket 48 rotatably connected to the hinge shaft 47. The clamping and supporting wheels 49 are located at both ends of the upper part of the mounting bracket 48, and the rollers 410 are located at both ends of the lower part of the mounting bracket 48.

[0038] like Figure 5 and Figure 6 As shown, the clamping and supporting wheel 49 includes an intermediate shaft 491 with an annular protrusion 4911 in the middle, two sleeves 492 sleeved from both ends of the intermediate shaft 491 with an "L"-shaped scanning surface, two first compression springs 493 embedded from both ends of the intermediate shaft 491, and two annular seats 494 threaded to both ends of the intermediate shaft 491. The outer diameter of the smaller portion of the sleeve 492 is the same as the outer diameter of the annular protrusion 4911. When the two sleeves 492 abut against the annular protrusion 4911, the outer diameter of the larger portion of the two sleeves 492 is the same as the outer diameter of the two annular seats 494. The two ends of the intermediate shaft 491 are tightened with nuts after passing through the mounting bracket 48. Meanwhile, a first annular groove 4941 is provided on the end face of the annular seat 494 near the sleeve 492, and a second annular groove 4921 corresponding to the first annular groove 4941 is provided on the end face of the sleeve 492 near the annular seat 494. The two ends of the first compression spring 493 are respectively embedded in the first annular groove 4941 and the second annular groove 4921. At the same time, an annular embedding groove with a scanning surface in the middle of the roller 410 is provided (not marked in the figure).

[0039] like Figure 5 and Figure 6 As shown, a rotation mechanism 411 is provided between the hinge shaft 47 and the mounting bracket 48, allowing the mounting bracket 48 to rotate within a 180-degree range so that the clamping support wheel 49 or the roller 410 faces upwards. The hinge shaft 47 is provided with a connecting shaft 471 with external threads at its end. The mounting bracket 48 is rotatably connected to the connecting shaft 471 in the middle. The end face of the hinge shaft 47 near the connecting shaft 471 is provided with two slots 472. The rotation mechanism 411 includes a locking block 4111 disposed on the mounting bracket 48 and embedded in the two slots 472, a third compression spring 4112 sleeved on the connecting shaft 471, and an adjusting sleeve 4113 threaded to the end of the connecting shaft 471. When the positions of the two locking blocks 4111 embedded in the slots 472 are interchanged, the mounting bracket 48 rotates 180 degrees.

[0040] like Figure 1 , Figure 5 As shown, when the distance between the first seat 11 and the second seat 12 is at its closest and the clamping rest wheel 49 is above the mounting bracket 48, the height of the first connecting arm 45 and the second connecting arm 46 is lower than the top height of the clamping rest wheel 49 in the orthographic projection range between the laser emitting device 2 and the receiving device 3.

[0041] Implementation effect: When a square-shaped object to be measured needs to be placed upright, the force of the first compression spring 493 is overcome, causing the clamp 492 to move towards the annular seat 494. This allows the object to be placed on the annular protrusion 4911 and the two smaller outer diameter portions of the clamp 492. During the reset process of the first compression spring 493, the clamp 492 clamps and fixes the object, thus achieving stable fixation. Additionally, if the thickness of the object cannot be less than the sum of the thickness of the annular protrusion 4911 and the thickness of the smaller outer diameter portions of the two clamps 492, additional pads are needed for support during clamping. If the object to be measured might bump into the laser emitting device 2 or the receiving device 3 when placed horizontally, the distance between the first seat 11 and the second seat 12 can be adjusted via the adjustment mechanism 13, thereby adjusting the distance between the laser emitting device 2 and the receiving device 3, allowing for the placement of wider objects. Meanwhile, during the change of the distance between the first seat 11 and the second seat 12, the first slider 43 and the second slider 44 of the support device 4 move up and down along the first slide rail 41 and the second slide rail 42 respectively, so that the hinge points (the position of the hinge axis 47) of the first connecting arm 45 and the second connecting arm 46 are located in the middle of the laser emitting device 2 and the receiving device 3, thereby avoiding the distance between the object to be tested and the laser emitting device 2 or the receiving device 3 being too small; at the same time, the mounting bracket 48 and the support wheel will not rotate during the movement of the first connecting arm 45 and the second connecting arm 46, thereby maintaining a horizontal state.

[0042] When it is necessary to adjust the distance between the first seat 11 and the second seat 12, the second seat 12 can be lifted, thereby canceling the interaction force between the bottom of the lifting seat 132 and the table. The lifting seat 132 moves downward under the combined action of gravity and the elastic force of the second compression spring 134, so that the limiting rack 133 and the limiting groove 131 are separated, thereby realizing the adjustment of the length of the telescopic sleeve 111 embedded in the second seat 12. After adjustment, the second seat 12 is lowered, so that the bottom of the lifting seat 132 rests on the table, and the limiting rack 133 and the limiting groove 131 are engaged.

[0043] Because the threads of the first threaded hole 123 and the second threaded hole 1321 are opposite in direction, when installing the second compression spring 134, by rotating the second compression spring 134, the first threaded connector 135 and the second threaded connector 136 can be simultaneously connected to the first threaded hole 123 and the second threaded hole 1321 respectively for installation, which facilitates installation. At the same time, the second compression spring 134 needs to be compressed to a certain extent during the installation process. At this time, the first threaded connector 135 can keep against the first threaded hole 123 and the second threaded connector 136 can keep against the second threaded hole 1321, which makes the connection more convenient.

[0044] In some users' use, the diameter measuring instrument is not placed directly on the table but is fixed by a bracket. At this time, the bottom of the lifting seat 132 hangs down naturally under the action of gravity and elasticity. When the limit knob bolt 137 is embedded in the limit hole 124, the limit rack 133 and the limit groove 131 are kept in a meshing state.

[0045] The cross-section of the object to be measured is usually not only square, but more often circular. When measuring an object with a circular cross-section, the mounting bracket 48 is rotated 180 degrees by the rotating mechanism 411, so that the two ends of the object with a circular cross-section can be directly placed on the two rollers 410 with annular embedded grooves in the middle, which facilitates the measurement.

[0046] Meanwhile, if the diameter of the object to be measured is large and the cross-section is circular, the height of the roller 410 will gradually decrease by moving the first seat 11 and the second seat 12 away from each other, thereby reducing the height of the object after it is placed, so as to prevent the top of the object from exceeding the measurement area.

[0047] During the process of rotating the mounting bracket 48 by 180 degrees, the mounting bracket 48 is pulled outward, which overcomes the elastic force of the third compression spring 4112 and causes the locking block 4111 to disengage from the slot 472. Thus, after rotating 180 degrees, the locking block 4111 is re-embedded in the slot 472 for limiting, thereby achieving the rotation of the mounting bracket 48 by 180 degrees.

[0048] This specific embodiment is merely an explanation of the present invention and is not intended to limit the invention. After reading this specification, those skilled in the art can make modifications to this embodiment without contributing any inventive step, but such modifications are protected by patent law as long as they are within the scope of the claims of the present invention.

Claims

1. A multifunctional diameter measuring instrument, comprising a base (1), a laser emitting device (2) disposed on the base (1), a receiving device (3) disposed on the base (1), and a support device (4) disposed on the front and rear sides of the base (1), characterized in that: The base (1) includes a first base (11) for mounting a laser emitting device (2), a second base (12) telescopically connected to the first base (11) and for mounting a receiving device (3), and an adjustment mechanism (13) disposed between the first base (11) and the second base (12). The mounting device (4) includes a first slide rail (41) located on the side of the laser receiver (3) on the first base (11) and extending vertically, a second slide rail (42) located on the side of the receiver (3) on the second base (12) and extending vertically, a first slider (43) mounted on the first slide rail (41) and a second slider (44) mounted on the second slide rail (42), a first connecting arm (45) hinged at one end to the first base (11) and at the other end to the second slider (44), a second connecting arm (46) hinged at one end to the second base (12) and at the other end to the first slider (43), a hinge shaft (47) located in the middle of the first connecting arm (45) and passing through the second connecting arm (46) to achieve hinge, a mounting bracket (48) mounted on the hinge shaft (47), and a clamping and mounting wheel (49) mounted on the mounting bracket (48). The clamping and resting wheel (49) includes an intermediate shaft (491) with an annular protrusion (4911) in the middle, two sleeves (492) sleeved from both ends of the intermediate shaft (491) and with scanning surfaces in the shape of "L", two first compression springs (493) embedded from both ends of the intermediate shaft (491), and two annular seats (494) threaded to both ends of the intermediate shaft (491). The outer diameter of the smaller portion of the outer diameter of the sleeve (492) is the same as the outer diameter of the annular protrusion (4911). When the two sleeves (492) abut against the annular protrusion (4911), the outer diameter of the larger portion of the outer diameter of the two sleeves (492) is the same as the outer diameter of the two annular seats (494). The annular seat (494) has a first annular groove (4941) on its end face near the sleeve (492), and the sleeve (492) has a second annular groove (4921) corresponding to the first annular groove (4941) on its end face near the annular seat (494). The two ends of the first compression spring (493) are respectively embedded in the first annular groove (4941) and the second annular groove (4921). The mounting bracket (48) is H-shaped. The middle part of the mounting bracket (48) is rotatably connected to the hinge shaft (47). The two ends of the intermediate shaft (491) of the clamping support wheel (49) pass through the two ends of the upper part of the mounting bracket (48) and are tightened and fixed by nuts through the protruding ends. The two ends of the lower part of the mounting bracket (48) are rotatably connected to a roller (410) with an annular embedded groove in the middle having a scanning surface in the shape of a "V". A rotation mechanism (411) is provided between the hinge shaft (47) and the mounting bracket (48) so that the mounting bracket (48) can rotate within a range of 180 degrees so that the clamping support wheel (49) faces upward or the roller (410) faces upward. The hinge shaft (47) is provided with a connecting shaft (471) with external threads at the end. The mounting bracket (48) is rotatably connected to the connecting shaft (471) in the middle. The hinge shaft (47) is provided with two slots (472) on the end face near the connecting shaft (471). The rotating mechanism (411) includes a block (4111) provided on the mounting bracket (48) and embedded in the two slots (472), a third compression spring (4112) sleeved on the connecting shaft (471), and an adjusting sleeve (4113) threaded to the end of the connecting shaft (471). When the positions of the slots (472) into which the two blocks (4111) are embedded are interchanged, the mounting bracket (48) rotates 180 degrees.

2. The multifunctional diameter measuring instrument according to claim 1, characterized in that: The first seat (11) has a telescopic sleeve (111) that is telescopically connected to the second seat (12) on its end face near the second seat (12). The second seat (12) has a mounting groove (121) at the bottom corresponding to the telescopic sleeve (111). The top of the mounting groove (121) has a through groove (122). The adjustment mechanism (13) includes a limiting tooth groove (131) at the bottom of the telescopic sleeve (111), a lifting seat (132) that is lifted and lowered in the mounting groove (121), and a lifting seat (132) that is lifted and lowered in the mounting groove (121). The upper surface of the lowering seat (132) and the limit rack (133) that passes through the through groove (122) are engaged with the limit rack (131). The second compression spring (134) is set between the mounting groove (121) and the lifting seat (132) and drives the limit rack (133) and the limit rack (131) to separate. When the base (1) is placed on the table, the bottom of the lifting seat (132) is also placed on the table, and the limit rack (133) is engaged with the limit rack (131).

3. A multifunctional diameter measuring instrument according to claim 2, characterized in that: The top of the mounting groove (121) is provided with first threaded holes (123) on both sides of the through groove (122). The lifting seat (132) is provided with a second threaded hole (1321) on the same position as the first threaded hole (123) with the opposite thread direction. The upper end of the second compression spring (134) is provided with a first threaded connector (135) threaded into the first threaded hole (123). The lower end of the second compression spring (134) is provided with a second threaded connector (136) threaded into the second threaded hole (1321).

4. A multifunctional diameter measuring instrument according to claim 2, characterized in that: The lifting seat (132) is threaded with a limit knob bolt (137), and the mounting groove (121) is provided with a limit hole (124) inside. When the limit knob bolt (137) is embedded in the limit hole (124), the limit rack (133) and the limit groove (131) mesh.

5. A multifunctional diameter measuring instrument according to claim 1, characterized in that: When the distance between the first seat (11) and the second seat (12) is at its closest point, in the orthographic projection range between the laser emitting device (2) and the receiving device (3), the height of the first connecting arm (45) and the second connecting arm (46) is lower than the top height of the clamping rest wheel (49).

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