Inner hole measuring sensor

Abstract

The inner hole measuring sensor comprises a shell, a strain block and two measuring claws, the strain block is fixedly located in the shell, and the two measuring claws are located on the right side of the shell and fixedly connected with the strain block. According to the utility model, the two measuring claws and the strain block are arranged, the two measuring claws move to drive the front side and the rear side of the strain block to move towards the front side and the rear side respectively, then the displacement sensor is driven to move, and the inner diameter of the inner hole is measured through the displacement amount of the displacement sensor. The device has the advantages of simple structure, convenience in maintenance, low use environment requirement and low cost.

Description

Technical Field

[0001] The utility model relates to the technical field of inner hole measurement, in particular to an inner hole measurement sensor. Background Art

[0002] Currently, the commonly used method for fast and effective inner hole measurement is laser measurement technology. For example, the patent with authorization announcement number "CN214372300U" discloses a bearing inner hole measurement device based on a laser sensor, which is characterized in that it includes a base, a bearing fixture, a sliding platform, a rotary joint, a laser ranging sensor and a control module. The bearing fixture is vertically fixed to one side of the base, on which the bearing to be measured is fixed. The sliding platform slides along the sliding guide rail installed on the base through a driving motor. The rotary joint is installed on the sliding platform through a bracket. The laser ranging sensor is installed at the end of the rotary joint. The control module includes a controller and a host computer. The input end of the controller is connected to the laser ranging sensor, and the output end is connected to the rotary joint and the laser ranging sensor respectively. The controller is connected to the host computer to realize information interaction.

[0003] However, laser ranging sensors are expensive. The manufacturing cost of laser ranging sensors is relatively high. The main reasons include the high manufacturing costs of lasers, precision optical components (such as lenses, reflectors) and high-precision circuits. In addition, the R&D costs are also high, which may be a burden for some small and medium-sized enterprises. Laser ranging sensors have high requirements for the environment. Factors such as temperature, humidity, and vibration may affect the measurement results. Therefore, the environment needs to be strictly controlled during use. There are high requirements for operators: Laser ranging sensors require professional personnel to operate and maintain, and the skills and experience of the operators are required to be high. Utility Model Content

[0004] The utility model aims to provide an inner hole measuring sensor, which has the advantages of simple structure, convenient maintenance, low requirements on the use environment and low cost.

[0005] The above technical objectives of the present invention are achieved through the following technical solutions:

[0006] An internal hole measuring sensor includes a housing, a strain block, and two measuring jaws;

[0007] The strain block is fixedly located inside the housing, and the two measuring claws are located on the right side of the housing, and the two measuring claws are fixedly connected to the strain block;

[0008] The strain block is a cuboid placed transversely, a first longitudinal rectangular hole is formed in the top right side of the strain block, a second transverse rectangular hole is formed in the middle of the top right side of the strain block, a third transverse rectangular hole is formed in the front left side of the top left side of the strain block, a fifth rectangular hole is formed in the left side of the front side wall of the third rectangular hole, a fourth transverse rectangular hole is formed in the back left side of the top left side of the strain block, and a sixth rectangular hole is formed in the left side of the back side wall of the fourth rectangular hole.

[0009] The third rectangular hole and the fourth rectangular hole are circularly arc-shaped on the right side of the inner wall.

[0010] The left side of the front side of the strain block is provided with a first circular hole penetrating the front side to the back side of the strain block, the first circular hole is located on the right side of the fifth rectangular hole, and a displacement sensor is arranged in the first circular hole, the front side of the displacement sensor is fixedly connected with the first circular hole corresponding to the front side wall of the third rectangular hole, and the back side of the displacement sensor is fixedly connected with the first circular hole corresponding to the back side wall of the fourth rectangular hole.

[0011] The right side of the strain block is provided with a semicircular mounting groove on the front side and the back side of the second rectangular hole, two measuring claws are respectively fixedly inserted into the mounting grooves, and a screw-fixed steel ball roller is fixedly arranged on the right side of the front side of the measuring claw on the front side and the right side of the back side of the measuring claw on the back side.

[0012] The preferred scheme is as follows:

[0013] Preferably, the measuring claw on the front side and the measuring claw on the back side are mirror-symmetrically arranged along the central transverse axis of the strain block.

[0014] The measuring claw on the front side comprises a leftmost fixed block with a semicircular vertical section, a connecting rod is fixedly arranged on the right side of the fixed block, a detection rod is fixedly arranged on the right side of the front side of the connecting rod, the fixed block, the connecting rod and the detection rod are integrally formed, a first rounded corner is arranged on the front side of the connecting rod, and a second rounded corner is arranged on the front side of the detection rod.

[0015] A first circular groove is formed in the front side of the detection rod, and the screw-fixed steel ball roller is fixedly arranged in the first circular groove.

[0016] Preferably, a spring is arranged in the first rectangular hole of the strain block.

[0017] Preferably, the front side and the back side of the strain block are arc-shaped.

[0018] Preferably, the front side of the top left side of the strain block is provided with a seventh rectangular hole, the seventh rectangular hole on the front side is in communication with the third rectangular hole and the fifth rectangular hole respectively, and the seventh rectangular hole on the back side is in communication with the fourth rectangular hole and the sixth rectangular hole respectively.

[0019] The back side of the right side wall of the fifth rectangular hole and the front side of the right side wall of the seventh rectangular hole are both fixedly provided with a limiting plate, and each limiting plate is located in the corresponding seventh rectangular hole.

[0020] Preferably, the shell is a long rectangular block with a waist-shaped longitudinal vertical section, the right side of the shell is provided with a slot, the strain block is inserted into the shell, the left side of the strain block is fixedly connected with the right side of the shell, the right side of the shell is fixedly provided with a cover plate, a second circular hole is formed in the middle of the right side of the cover plate, and the two measuring claws pass through the second circular hole.

[0021] Preferably, a third circular hole penetrating through the strain block and the shell is formed in the inner back side wall of the first rectangular hole, an inner thread is arranged on the inner side wall of the third circular hole of the strain block, and a pressing block is threadedly connected with the inner thread of the third circular hole of the strain block.

[0022] The inner front side wall of the first rectangular hole and the front side of the pressing block are both provided with a limiting groove, and the two ends of the spring are located in the corresponding limiting grooves respectively.

[0023] Preferably, a first linear groove is formed in the front side of the strain block in the transverse direction, the left side of the first linear groove is in communication with the first circular hole, a second linear groove is formed in the right side of the top wall of the first linear groove, and the second linear groove is in communication with the first rectangular hole.

[0024] A fourth circular hole is fixedly arranged at the middle position of the top left side of the strain block, the fourth circular hole is located on the left side of the third rectangular hole, a third linear groove is formed in the middle position of the top of the strain block, the third linear groove is in communication with the fourth circular hole and the first rectangular hole, and the third linear groove is located between the third rectangular hole and the fourth rectangular hole.

[0025] A fifth circular hole is formed in the middle position of the back side of the strain block, and the fifth circular hole is in communication with the fourth circular hole.

[0026] The connecting line of the displacement sensor is in communication with the outside through the first linear groove, the second linear groove, the third linear groove, the fourth circular hole and the fifth circular hole.

[0027] In conclusion, the utility model discloses two measuring claws and strain block setting, through two measuring claw displacement drive strain block front side and rear side respectively produce displacement to the front and rear sides, and further drive displacement sensor to produce displacement, through the displacement of displacement sensor, the inner diameter of the inner hole is measured. BRIEF DESCRIPTION OF DRAWINGS

[0028] Figure 1 It is the whole structure modeling schematic diagram of example;

[0029] Figure 2 It is the front side schematic diagram of whole structure modeling schematic diagram of example's strain block, measuring claw, displacement sensor;

[0030] Figure 3 It is the rear side schematic diagram of whole structure modeling schematic diagram of example's strain block, measuring claw, displacement sensor;

[0031] Figure 4 It is the front side view of whole structure modeling schematic diagram of example's strain block;

[0032] Figure 5 It is the schematic diagram of front side measuring claw and the schematic diagram of rear side measuring claw's partial section view.

[0033] In the drawing, 1, shell;2, strain block;3, measuring claw;4, displacement sensor;

[0034] 111, sealing plate;

[0035] 211, second rectangular perforation;212, third rectangular perforation;213, fifth rectangular perforation;214, fourth rectangular perforation;215, sixth rectangular perforation;216, first circular perforation;217, installation slot;218, first rectangular perforation;219, spring;220, seventh rectangular perforation;221, limit plate;222, abutting block;223, limit slot;224, first wire slot;225, second wire slot;226, fourth circular perforation;227, third wire slot;228, fifth circular perforation;

[0036] 311, screw fixed steel ball roller;312, fixed block;313, connecting rod;314, detection rod. DETAILED DESCRIPTION

[0037] The utility model will be further explained in detail in connection with the drawings.

[0038] Identical parts are indicated by identical reference numerals. It should be noted that the words "front", "rear", "left", "right", "upper" and "lower" used in the following description refer to the directions in the drawings.

[0039] Inner hole measuring sensor, such asFigures 1-5 As shown, it comprises a shell 1, a strain block 2, two measuring claws 3;

[0040] The strain block 2 is fixed inside the shell 1, and the two measuring claws 3 are located on the right side of the shell 1, both of which are fixedly connected with the strain block 2.

[0041] The strain block 2 is a horizontally placed cuboid, and the front side and the rear side of the strain block 2 are both arc-shaped, at this time, the longitudinal vertical section of the strain block 2 is in the shape of a waist, further increasing the strength of the strain block 2.

[0042] A longitudinal first rectangular hole 218 is formed in the top right side of the strain block 2, and a transverse second rectangular hole 211 is formed in the middle position of the top right side of the strain block 2, the second rectangular hole 211 is located on the right side of the first rectangular hole 218, and the second rectangular hole 211 also penetrates the right side wall of the first rectangular hole 218 and the right side of the strain block 2;

[0043] A transverse third rectangular hole 212 is formed in the front side of the top left side of the strain block 2, a fifth rectangular hole 213 is formed in the left side of the front side wall of the third rectangular hole 212, a transverse fourth rectangular hole 214 is formed in the rear side of the top left side of the strain block 2, and a sixth rectangular hole 215 is formed in the left side of the rear side wall of the fourth rectangular hole 214, the inner right side walls of the third rectangular hole 212 and the fourth rectangular hole 214 are arc-shaped, which can reduce the wall thickness between the vertex of the arc and the first rectangular hole 218, and the vertex of the arc and the first rectangular hole 218 become a wry point, when the front side and the rear side of the second rectangular hole 211 of the strain block 2 move towards the middle, at this time, the vertex of the arc between the front side and the rear side and the first rectangular hole 218 is partially deformed, further pulling the left side of the block corresponding to the front side wall of the third rectangular hole 212 of the strain block 2 to move forward and the left side of the block corresponding to the rear side wall of the fourth rectangular hole 214 to move backward.

[0044] The front side and the rear side of the top left side of the strain block 2 are both provided with a seventh rectangular hole 220, the seventh rectangular hole 220 located on the front side is in communication with the third rectangular hole 212 and the fifth rectangular hole 213, and the seventh rectangular hole 220 located on the rear side is in communication with the fourth rectangular hole 214 and the sixth rectangular hole 215;

[0045] The rear side of the right side wall of the fifth rectangular hole 213 is fixedly provided with a limiting plate 221, and the front side of the right side wall of the seventh rectangular hole 220 is also fixedly provided with a limiting plate 221. Each limiting plate 221 is located in the corresponding seventh rectangular hole 220. Through the arrangement of the limiting plate 221, the displacement of the block corresponding to the front side wall of the third rectangular hole 212 of the strain block 2 and the block corresponding to the rear side wall of the fourth rectangular hole 214 can be limited, so as to prevent the displacement from being too large.

[0046] The left side of the front side of the strain block 2 is provided with a first circular hole 216 penetrating from the front side to the rear side of the strain block 2. The first circular hole 216 is located to the right of the fifth rectangular hole 213. A displacement sensor 4 is arranged in the first circular hole 216. The front side of the displacement sensor 4 is fixedly connected with the first circular hole 216 corresponding to the front side wall of the third rectangular hole 212. The rear side of the displacement sensor 4 is fixedly connected with the first circular hole 216 corresponding to the rear side wall of the fourth rectangular hole 214.

[0047] When the block corresponding to the front side wall of the third rectangular hole 212 of the strain block 2 is displaced forward on the left side and the block corresponding to the rear side wall of the fourth rectangular hole 214 is displaced backward on the left side, the front side and the rear side of the displacement sensor 4 are pulled, respectively, and displacement is generated.

[0048] The right side of the strain block 2 is provided with a semicircular mounting groove 217 on the front side and the rear side of the second rectangular hole 211. Two measuring claws 3 are fixedly inserted into the mounting grooves 217. The right side of the front side of the measuring claw 3 located on the front side and the right side of the rear side of the measuring claw 3 located on the rear side are fixedly provided with screw-fixed steel ball rollers 311. The measuring claw 3 on the front side and the measuring claw 3 on the rear side are placed in mirror symmetry along the central transverse axis of the strain block 2.

[0049] The measuring claw 3 on the front side includes a fixed block 312 with a semicircular vertical section on the leftmost side. The right side of the fixed block 312 is fixedly provided with a connecting rod 313. The right side of the front side of the connecting rod 313 is fixedly provided with a detection rod 314. The fixed block 312, the connecting rod 313 and the detection rod 314 are integrally formed. The front side of the connecting rod 313 is provided with a first rounded corner. The front side of the detection rod 314 is provided with a second rounded corner.

[0050] The front side of the detection rod 314 is provided with a first circular groove. The screw-fixed steel ball roller 311 is fixedly located in the first circular groove.

[0051] A sixth circular hole is formed on the right side of the front side of the strain block 2, a first bolt head accommodation groove is arranged at the sixth circular hole on the right side of the front side and the rear side of the strain block 2, a first threaded hole is formed on the front side of the fixing block 312 of the measuring claw 3, and a first bolt is arranged on the front side and the rear side of the sixth circular hole, the first bolt is threadedly connected with the corresponding measuring claw 3, thereby achieving the function of fixing the measuring claw 3, and a semicircular accommodation groove is further formed on the semicircular side wall of the two installation grooves 217 for conveniently further tightening the measuring claw 3.

[0052] The first rectangular hole 218 of the strain block 2 is internally provided with a spring 219, a third circular hole penetrating the strain block 2 and the shell 1 is formed on the rear side wall of the first rectangular hole 218, an internal thread is arranged on the inner side wall of the third circular hole of the strain block 2, and a pressing block 222 is threadedly connected in the third circular hole of the strain block 2.

[0053] The front side wall of the first rectangular hole 218 and the front side of the pressing block 222 are both provided with a limiting groove 223, and the two ends of the spring 219 are respectively arranged in the corresponding limiting groove 223.

[0054] A cross groove is formed on the rear side of the pressing block 222, so as to conveniently rotate the pressing block 222 by using a screwdriver.

[0055] The spring 219 can further facilitate the resetting of the strain block 2, and the front side and the rear side of the first rectangular hole 218 of the strain block 2 are respectively pushed by the reaction force of the spring 219, thereby facilitating the resetting of the block corresponding to the front side wall of the third rectangular hole 212 and the block corresponding to the rear side wall of the fourth rectangular hole 214.

[0056] The shell 1 is a long rectangular block with a waist-shaped longitudinal vertical section, the right side of the shell 1 is provided with an insertion groove, the strain block 2 is inserted into the shell 1, the left side of the strain block 2 is fixedly connected with the right side of the shell 1, the right side of the shell 1 is fixedly provided with a cover plate 111, a second circular hole is formed in the middle position of the right side of the cover plate 111, and the two measuring claws 3 pass through the second circular hole, and the shell 1 and the strain block 2 are fixed by screws.

[0057] A seventh circular hole is formed in the middle position of the left side of the shell 1.

[0058] The front side of the strain block 2 is provided with a horizontal first linear groove 224, the left side of the first linear groove 224 is communicated with the first circular hole 216, a second linear groove 225 is formed in the right side of the top wall of the first linear groove 224, and the second linear groove 225 is communicated with the first rectangular hole 218.

[0059] The fourth circular through hole 226 is located on the left side of the third rectangular through hole 212, and the third wire slot 227 is arranged on the top of the strain block 2, and the third wire slot 227 is connected with the fourth circular through hole 226 and the first rectangular through hole 218, and the third wire slot 227 is located between the third rectangular through hole 212 and the fourth rectangular through hole 214.

[0060] The fifth circular through hole 228 is arranged on the middle position of the rear side of the strain block 2, and the fifth circular through hole 228 is connected with the fourth circular through hole 226.

[0061] The displacement sensor 4 is an LVDT differential transformer type displacement sensor 4, and the connecting line of the displacement sensor 4 is connected with the outside through the first wire slot 224, the second wire slot 225, the third wire slot 227, the fourth circular through hole 226, the fifth circular through hole 228 and the seventh circular through hole.

[0062] The eighth rectangular through hole and the ninth rectangular through hole are arranged on the rear side of the strain block 2 corresponding to the rear side of the block body, the eighth rectangular through hole is connected with the rear side of the first circular through hole 216, the eighth rectangular through hole is also connected with the ninth rectangular through hole, the bottom of the ninth rectangular through hole is flush with the bottom of the eighth rectangular through hole, and the upper end of the ninth rectangular through hole penetrates the top of the strain block 2, at this time, the part of the strain block 2 cut by the eighth rectangular through hole and the ninth rectangular through hole can be deformed, at this time, the second threaded hole is arranged on the bottom wall of the eighth rectangular through hole, the eighth circular through hole corresponding to the second threaded hole is arranged on the top of the strain block 2, and the second bolt head accommodation slot is arranged on the eighth circular through hole of the top of the strain block 2, the second bolt is inserted into the eighth circular through hole, and the second bolt is screwed with the second threaded hole, so as to clamp the displacement sensor 4.

[0063] Because the block body corresponding to the front side wall of the third rectangular through hole 212 of the strain block 2 needs to be wired, at this time, the bolt cannot be used for fixation, therefore, the ninth circular through hole is arranged on the top of the block body corresponding to the front side wall of the third rectangular through hole 212 of the strain block 2, and the seventh part of the ninth circular through hole is connected with the first circular through hole 216, the plug is inserted into the upper end and the lower end of the ninth circular through hole, the plug is pressed against the displacement sensor 4, and the front side of the displacement sensor 4 is fixed.

[0064] Specific implementation process:

[0065] Step one: in the working process, the measuring claw 3 is selected according to the inner diameter of the bearing to be measured, and the distance between the front screw-fixed steel ball roller 311 of the front measuring claw 3 and the rear screw-fixed steel ball roller 311 of the rear measuring claw 3 exceeds 2-3 inches of the inner diameter of the bearing.

[0066] The inner hole measuring sensor needs to be fixed on the sliding platform of the patent with the authorization publication number "CN214372300U", the bearing is fixed on the bearing clamp, and the rotary joint does not drive the bearing to rotate;

[0067] Step two: the sliding platform drives the two measuring jaws 3 of the inner hole measuring sensor to insert into the inner hole of the bearing, at this time, the right side of the two measuring jaws 3 is pressed into the inner hole of the bearing through the screw-fixed steel ball roller 311, at this time, the top points of the front side and the rear side of the arc of the strain block 2 and the part between the first rectangular perforation 218 are deformed, thereby respectively pulling the left side of the block corresponding to the third rectangular perforation 212 front side wall of the strain block 2 to displace forward and the left side of the block corresponding to the fourth rectangular perforation 214 rear side wall to displace backward;

[0068] At the same time, the spring 219 is compressed;

[0069] At the same time, the displacement sensor 4 is pulled, and the displacement sensor 4 transmits signals to the signal processing outside through the connecting line;

[0070] At the same time, the rotary joint drives the bearing to rotate, and the right side of the measuring jaw 3 of the inner hole measuring sensor driven by the sliding platform moves left and right in the inner hole of the bearing, and the displacement sensor 4 constantly transmits signals to the signal processing outside through the connecting line;

[0071] Step three: after the measurement is completed, the sliding platform drives the two measuring jaws 3 of the inner hole measuring sensor to exit the inner hole of the bearing, at this time, the front side and the rear side of the arc of the strain block 2 and the spring 219 are all rebounded, so that the two measuring jaws 3 are reset.

[0072] The specific embodiment is only an explanation of the utility model, and is not a limitation of the utility model. Those skilled in the art can make modifications to the embodiment without creative contribution after reading the specification, but as long as it is within the scope of the claims of the utility model, it is protected by the patent law.

Claims

1. An internal bore measurement sensor characterised in that: It includes a shell (1), a strain block (2), two measuring claws (3); The strain block (2) is fixed inside the shell (1), and the two measuring claws (3) are located on the right side of the shell (1), and the two measuring claws (3) are fixedly connected with the strain block (2); The strain block (2) is a horizontally placed cuboid, a longitudinal first rectangular hole (218) is formed in the top right side of the strain block (2), a transverse second rectangular hole (211) is formed in the middle position of the top right side of the strain block (2), a transverse third rectangular hole (212) is formed in the front side of the top left side of the strain block (2), a fifth rectangular hole (213) is formed in the left side of the front side wall of the third rectangular hole (212), a transverse fourth rectangular hole (214) is formed in the rear side of the top left side of the strain block (2), and a sixth rectangular hole (215) is formed in the left side of the rear side wall of the fourth rectangular hole (214). The third rectangular hole (212) and the fourth rectangular hole (214) are circularly arc-shaped on the right side of the inner wall. A first circular hole (216) penetrating through the front side to the rear side of the strain block (2) is formed in the left side of the front side of the strain block (2), the first circular hole (216) is located on the right side of the fifth rectangular hole (213), a displacement sensor (4) is arranged in the first circular hole (216), the front side of the displacement sensor (4) is fixedly connected with the first circular hole (216) corresponding to the front side wall of the third rectangular hole (212), and the rear side of the displacement sensor (4) is fixedly connected with the first circular hole (216) corresponding to the rear side wall of the fourth rectangular hole (214). A semicircular mounting groove (217) is formed in the right side of the strain block (2) on the front side and the rear side of the second rectangular hole (211), the two measuring claws (3) are respectively fixedly inserted into the mounting grooves (217), and screw-fixed steel ball rollers (311) are fixedly arranged on the right side of the front side of the measuring claw (3) located on the front side and the right side of the rear side of the measuring claw (3) located on the rear side.

2. The bore measurement sensor of claim 1, wherein: The front measuring claw (3) and the rear measuring claw (3) are mirror-symmetrically arranged along the central transverse axis of the strain block (2). The front measuring claw (3) comprises a leftmost fixed block (312) with a semicircular vertical cross section, a connecting rod (313) is fixedly arranged on the right side of the fixed block, a detection rod (314) is fixedly arranged on the right side of the front side of the connecting rod (313), the fixed block (312), the connecting rod (313) and the detection rod (314) are integrally formed, a first rounded corner is arranged on the front side of the connecting rod (313), and a second rounded corner is arranged on the front side of the detection rod (314). A first circular groove is formed in the front side of the detection rod (314), and the screw-fixed steel ball roller (311) is fixedly arranged in the first circular groove.

3. The bore measurement sensor of claim 1, wherein: A spring (219) is arranged in the first rectangular hole (218) of the strain block (2).

4. The bore measurement sensor of claim 1, wherein: The front side and the rear side of the strain block (2) are arc-shaped.

5. The bore measurement sensor of claim 1, wherein: The front side of the top left side of the strain block (2) is provided with a seventh rectangular hole (220), and the seventh rectangular hole (220) on the front side is respectively communicated with the third rectangular hole (212) and the fifth rectangular hole (213); the rear side of the seventh rectangular hole (220) is respectively communicated with the fourth rectangular hole (214) and the sixth rectangular hole (215). The rear side of the right side wall of the fifth rectangular hole (213) and the front side of the right side wall of the seventh rectangular hole are both fixedly provided with a limiting plate (221), and each limiting plate (221) is located in the corresponding seventh rectangular hole (220).

6. The bore measurement sensor of claim 3, wherein: The shell (1) is a waist-shaped rectangular block in longitudinal vertical section, the right side of the shell (1) is provided with a slot, the strain block (2) is inserted into the shell (1), the left side of the strain block (2) is fixedly connected with the right side of the shell (1), the right side of the shell (1) is fixedly provided with a cover plate (111), the middle position of the right side of the cover plate (111) is provided with a second circular hole, and two measuring claws (3) pass through the second circular hole.

7. The bore measurement sensor of claim 6, wherein: The inside rear side wall of the first rectangular hole (218) is provided with a third circular hole penetrating the strain block (2) and the shell (1), the inside side wall of the third circular hole of the strain block (2) is provided with an internal thread, and the third circular hole of the strain block (2) is connected with a abutting block (222) in a threaded manner. The inside front side wall of the first rectangular hole (218) and the front side of the abutting block (222) are both provided with a limiting groove (223), and the two ends of the spring (219) are respectively located in the corresponding limiting groove (223).

8. The bore measurement sensor of claim 1, wherein: The front side of the strain block (2) is provided with a transverse first wire groove (224), the left side of the first wire groove (224) is communicated with the first circular hole (216), the right side of the top wall of the first wire groove (224) is provided with a second wire groove (225), and the second wire groove (225) is communicated with the first rectangular hole (218); The middle position of the top left side of the strain block (2) is fixedly provided with a fourth circular hole (226), the fourth circular hole (226) is located on the left side of the third rectangular hole (212), the middle position of the top of the strain block (2) is provided with a third wire groove (227), the third wire groove (227) is communicated with the fourth circular hole (226) and the first rectangular hole (218), and the third wire groove (227) is located between the third rectangular hole (212) and the fourth rectangular hole (214); The middle position of the rear side of the strain block (2) is provided with a fifth circular hole (228), and the fifth circular hole (228) is communicated with the fourth circular hole (226); The connecting line of the displacement sensor (4) is communicated with the outside through the first wire groove (224), the second wire groove (225), the third wire groove (227), the fourth circular hole (226) and the fifth circular hole (228).

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