Crankcase size detection device

Abstract

The invention relates to the technical field of dimension detection equipment, and discloses a crankcase dimension detection device, which comprises an operation table, and a bracket is arranged on the operation table; the fixing assembly is arranged on the operation table and used for fixing the crankcase; the first measuring assemblies are arranged on the operation table and located on the two sides of the fixing assembly; the second measuring assembly is arranged on the support and located above the fixing assembly, the first measuring assembly comprises a second driving part fixed to the support, and a measuring mechanism is arranged at the output end of the second driving part. Through the arrangement of the first measurement assembly and the second measurement assembly, the measurement of different position dimensions of the crankcase is realized, and the detection efficiency is improved.

Description

Technical Field

[0001] The present application relates to the technical field of dimension detection equipment, and in particular to a crankcase dimension detection device. Background Art

[0002] The crankcase, also known as the cylinder seat, is an important component of the compressor. It mainly supports and fixes the crankshaft. The crankcase can reduce the vibration generated when the crankshaft rotates and protect the compressor, providing guarantee for the stable and efficient operation of the refrigeration compressor.

[0003] Reference Figure 8 The crankcase is usually an integrated structure, and the crankcase 5 includes a base body 51, a crankshaft mounting seat 52 is arranged at the center of the base body 51, a crankshaft mounting hole 521 is penetrated through the crankshaft mounting seat 52, a plurality of supporting legs 53 are arranged at the bottom of the base body 51 and on the surrounding side of the crankshaft mounting seat 52, and a cylinder barrel 54 is arranged above the base body 51 and on one side of the crankshaft mounting hole 521.

[0004] There are strict requirements on the size of the crankcase after machining, and the crankshaft needs to be inspected for size. When inspecting the crankcase size, the sizes of different positions of the crankcase need to be measured separately using different tools, resulting in low measurement efficiency. Summary of the invention

[0005] In order to solve the problem that the dimensions of different positions of the crankcase need to be measured separately using different tools, resulting in low measurement efficiency, the present application provides a crankcase dimension detection device.

[0006] The present application provides a crankcase size detection device, which adopts the following technical solution: A crankcase size detection device comprises an operating table, on which a bracket is arranged; A fixing assembly, arranged on the operating table, for fixing the crankcase; A first measuring component is disposed on the operating table and located on both sides of the fixing component; The second measuring component is arranged on the bracket and is located above the fixing component. The first measuring component includes a second driving member fixed on the bracket. The output end of the second driving member is provided with a measuring mechanism.

[0007] By adopting the above technical solution, the crankcase is first fixed on the operating table by a fixing component, and the position size of the drill hole on the crankcase support leg is measured by using the first measuring component; by placing the second measuring component at different positions of the bracket, the hole diameter and depth size of the crankshaft mounting hole and the inner diameter of the cylinder barrel can be measured, and the dimensions of different positions of the crankcase can be measured by the first measuring component and the second measuring component, thereby improving the measurement efficiency.

[0008] Optionally, the fixing assembly includes a fixing seat arranged on the operating table, a plurality of elastic teeth are arranged at one end of the fixing seat away from the operating table, and a wedge-shaped protrusion is arranged on the outer side of the end of the elastic tooth; a sleeve is slidably sleeved on the fixing seat, and an inclined groove cooperating with the wedge-shaped protrusion is arranged in the sleeve; a pushing frame is arranged on the sleeve, and the pushing frame passes through and is slidably connected to the operating table, and a first driving member is arranged below the operating table, and the output end of the first driving member is connected to the pushing frame.

[0009] By adopting the above technical solution, when in use, the crankshaft mounting seat is first placed in the fixed seat, the end of the crankshaft mounting seat abuts against the operating table, the first driving member drives the pushing frame to move, thereby driving the movement of the sleeve, and the inclined groove in the sleeve cooperates with the wedge-shaped protrusion, so that the elastic teeth shrink inward and abut against the outer wall of the crankshaft mounting seat, thereby fixing the crankcase and ensuring the stability of the crankcase.

[0010] Optionally, the first measuring component includes a slider, a clamping block is provided at the bottom of the slider, guide grooves are provided on the operating table and on both sides of the fixed component, the clamping block is slidably connected in the guide grooves, a positioning piece for fixing the crankcase support leg is provided at one end of the slider close to the fixed component, and a locking piece is provided at one end of the slider away from the fixed component; a pointer is provided on one side of the slider, and a scale corresponding to the pointer is provided on the operating table.

[0011] By adopting the above technical solution, when fixing the crankcase, the slider is moved to connect the positioning piece with the crankcase support foot, and the slider is fixed by a locking piece to prevent the slider from moving. The rotation of the crankcase is limited by the positioning piece to ensure the stability of the crankcase and improve the measurement accuracy. At the same time, when the slider moves, the distance between the drill hole on the crankcase support foot and the axis of the crankshaft mounting hole can be obtained by observing the position of the pointer on the scale and reading the scale value, thereby verifying whether it meets the size requirements.

[0012] Optionally, the positioning member includes a guide rod, a boss is provided at one end of the guide rod, and a positioning block is provided on the boss; a connecting seat is provided on the sliding block, and a first groove and a second groove are sequentially opened in the connecting seat, the guide rod is slidably connected to the first groove, an elastic member is sleeved on the guide rod, the elastic member is placed in the second groove, one end of the elastic member is connected to the boss, and the other end of the elastic member is connected to the bottom of the second groove.

[0013] By adopting the above technical solution, when fixing the crankcase, the positioning hole is placed in the drilled hole of the crankcase support foot, and the elastic member is used to make the boss abut against the crankcase support foot. Due to the different heights of the crankcase support feet, the positioning member can move up and down by sliding along the first groove through the guide rod, so that the end of the crankshaft mounting seat can abut against the operating table, which is convenient for the subsequent measurement of the depth of the crankshaft mounting hole.

[0014] Optionally, the measuring mechanism includes a shell, a sleeve rod, a telescopic rod, an inner rod, a third driving member and a third driving member. The shell is connected to the output end of the second driving member, the sleeve rod is connected to an end of the shell away from the second driving member, the telescopic rod slides and is penetrated in the sleeve rod, the third driving member and the fourth driving member are arranged in the shell, and the output end of the third driving member is connected to the telescopic rod; the inner rod slides and is penetrated in the telescopic rod, and the output end of the fourth driving member is connected to the inner rod; and a plurality of measuring members are arranged between the sleeve and the telescopic rod.

[0015] By adopting the above technical solution, when measuring the hole diameter, the telescopic rod is driven to move by the third driving member, so that multiple measuring members abut against the inner wall of the measured hole, ensuring that the measuring mechanism and the measured hole are coaxially arranged, thereby improving the measurement accuracy; when measuring the depth of the hole, the measuring member abuts against the top of the hole, and the inner rod is driven to move by the fourth driving member and abuts against the operating table, thereby realizing the measurement of the depth of the hole.

[0016] Optionally, the measuring piece includes a first support rod and a second support rod hinged to each other, the end of the first support rod is hinged to the side wall of the sleeve rod, a limit platform is provided at one end of the telescopic rod located outside the sleeve rod, and the end of the second support rod is hinged to the side wall of the limit platform; when measuring, the telescopic rod is moved so that the outer side of the hinge between the first support rod and the second support rod abuts against the inner wall of the measured hole.

[0017] By adopting the above technical solution, the telescopic rod is moved so that the outer side of the hinge between the first support rod and the second support rod abuts against the inner wall of the measured hole, ensuring that the measuring mechanism is coaxial with the measured hole and the accuracy of the measurement.

[0018] Optionally, a first clearance groove for accommodating a first support rod is formed on an outer wall of the sleeve rod, and a second clearance groove for accommodating a second support rod is formed on an outer wall of the limiting platform.

[0019] By adopting the above technical solution and providing the first clearance groove and the second clearance groove, the space occupied by the measuring member is reduced and the measuring range of the measuring member is increased.

[0020] Optionally, a control terminal is disposed in the housing, a touch sensor is disposed at the connection between the first support rod and the second support rod, and the control terminal is electrically connected to the touch sensor.

[0021] By adopting the above technical solution, when the telescopic rod moves, the touch sensor contacts the inner wall of the measuring hole and transmits a signal to the control terminal. The control terminal calculates the aperture size of the measured hole according to the moving distance of the telescopic rod, thereby improving the measurement efficiency.

[0022] In summary, the present application includes at least one of the following beneficial technical effects: first, the crankcase is fixed on the operating table by a fixing component, and the position size of the drill hole on the crankcase support leg is measured by using the first measuring component; by placing the second measuring component at different positions of the bracket, the hole diameter and depth size of the crankshaft mounting hole and the inner diameter of the cylinder barrel can be measured, and the dimensions of different positions of the crankcase can be measured by the first measuring component and the second measuring component, thereby improving the measurement efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a structural schematic diagram of the crankcase size detection device of the present application.

[0024] Figure 2 It is a schematic diagram of the structure of the fixing component and the first measuring component of the present application.

[0025] Figure 3 It is a structural schematic diagram of the positioning member of this application.

[0026] Figure 4 It is a structural schematic diagram of one state of the measurement mechanism of this application.

[0027] Figure 5 It is a structural schematic diagram of another state of the measuring mechanism of the present application.

[0028] Figure 6 It is a schematic diagram of the measuring end structure of the measuring mechanism of this application.

[0029] Figure 7 yes Figure 6 Enlarged view of part A in the middle.

[0030] Figure 8 It is a structural diagram of the crankcase.

[0031] Reference numerals: 1, operating table; 11, bracket; 12, guide groove; 2, fixing assembly; 21, fixing seat; 211, elastic tooth; 2111, wedge-shaped protrusion; 22, sleeve; 221, inclined sink groove; 23, pushing frame; 24, first driving member; 3, first measuring assembly; 31, slider; 311, block; 312, connecting seat; 3121, first sink groove; 3122, second sink groove; 32, locking member; 33, pointer; 34, positioning member; 341, guide rod; 342, boss; 343, positioning block; 3 5. Elastic member; 36. Scale; 4. Second measuring assembly; 41. Second driving member; 42. Third driving member; 43. Fourth driving member; 44. Sleeve rod; 441. First clearance groove; 45. Telescopic rod; 451. Limiting platform; 452. Second clearance groove; 46. Inner rod; 47. Measuring member; 471. First support rod; 471. Second support rod; 48. Shell; 49. Touch sensor; 5. Crankcase; 51. Seat; 52. Crankshaft mounting seat; 521. Crankshaft mounting hole; 53. Support foot; 54. Cylinder barrel. DETAILED DESCRIPTION

[0032] Embodiments of the present application are described in detail below, examples of which are shown in the accompanying drawings.

[0033] In the description of this specification, the description with reference to the terms "certain embodiments", "one embodiment", "some embodiments", "illustrative embodiments", "examples", "specific examples", or "some examples" means that the specific features, structures, materials, or characteristics described in conjunction with the embodiments or examples are included in at least one embodiment or example of the present application. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described may be combined in any one or more embodiments or examples in a suitable manner.

[0034] Reference Figure 8 The crankcase 5 includes a base body 51, a crankshaft mounting seat 52 is arranged at the center of the base body 51, a crankshaft mounting hole 521 is penetrated through the crankshaft mounting seat 52, a plurality of supporting legs 53 are arranged at the bottom of the base body 51 and on the peripheral side of the crankshaft mounting seat 52, and a cylinder barrel 54 is arranged above the base body 51 and on one side of the crankshaft mounting hole 521.

[0035] The present application embodiment discloses a crankcase 5 size detection device, referring to Figure 1, including an operating table 1, on which a bracket 11 is provided; a fixing component 2, which is provided on the operating table 1 and is used to fix a crankcase 5; a first measuring component 3, which is provided on the operating table 1 and is located on both sides of the fixing component 2; a second measuring component 4, which is provided on the bracket 11 and is located above the fixing component 2, the first measuring component 3 includes a second driving member 41 fixed on the bracket 11, and a measuring mechanism is provided at the output end of the second driving member 41.

[0036] The second measuring component 4 can be set at different positions. One is that the second measuring component 4 is set directly above the crankcase 5 and coaxially with the crankshaft mounting hole 521 to achieve measurement of the aperture and depth dimensions of the crankshaft mounting hole 521; the other is that the second measuring component 4 is coaxially with the cylinder barrel 54 to achieve measurement of the inner diameter of the cylinder barrel 54.

[0037] First, the crankcase 5 is fixed on the operating table 1 by the fixing component 2, and the position size of the drill hole on the crankcase 5 support leg 53 is measured by the first measuring component 3; by placing the second measuring component 4 at different positions of the bracket 11, the hole diameter and depth size of the crankshaft mounting hole 521 and the inner diameter of the cylinder barrel 54 can be measured, and the dimensions of different positions of the crankcase 5 can be measured by the first measuring component 3 and the second measuring component 4, thereby improving the measurement efficiency.

[0038] Reference Figure 2 The fixing assembly 2 includes a fixing seat 21 arranged on the operating table 1, and a plurality of elastic teeth 211 are arranged at one end of the fixing seat 21 away from the operating table 1, and a wedge-shaped protrusion 2111 is arranged on the outer side of the end of the elastic tooth 211; a sleeve 22 is slidably sleeved on the fixing seat 21, and an inclined sink groove 221 cooperating with the wedge-shaped protrusion 2111 is arranged in the sleeve 22; a pushing frame 23 is arranged on the sleeve 22, and the pushing frame 23 passes through and is slidably connected to the operating table 1, and a first driving member 24 is arranged below the operating table 1, and the output end of the first driving member 24 is connected to the pushing frame 23.

[0039] When in use, first place the crankshaft mounting seat 52 in the fixing seat 21, with the end of the crankshaft mounting seat 52 abutting against the operating table 1, and the first driving member 24 drives the pushing frame 23 to move, thereby driving the movement of the sleeve 22, and the inclined groove 221 in the sleeve 22 cooperates with the wedge-shaped protrusion 2111, so that the elastic teeth 211 shrink inwardly and abut against the outer wall of the crankshaft mounting seat 52, thereby fixing the crankcase 5 and ensuring the stability of the crankcase 5.

[0040] Reference Figure 2 and Figure 3The first measuring component 3 includes a slider 31, a block 311 is provided at the bottom of the slider 31, guide grooves 12 are provided on both sides of the fixed component 2 on the operating table 1, and the block 311 is slidably connected in the guide groove 12. A positioning member 34 for fixing the support leg 53 of the crankcase 5 is provided at one end of the slider 31 close to the fixed component 2, and a locking member 32 is provided at one end of the slider 31 away from the fixed component 2. The locking member 32 is threaded and penetrates and is connected to the slider 31, and the end of the locking member 32 abuts against the bottom wall of the guide groove 12; a pointer 33 is provided on one side of the slider 31, and a scale 36 corresponding to the pointer 33 is provided on the operating table 1.

[0041] When fixing the crankcase 5, the slider 31 is moved to connect the positioning member 34 with the crankcase 5 support leg 53, and the slider 31 is fixed by the locking member 32 to prevent the slider 31 from moving. The rotation of the crankcase 5 is limited by the positioning member 34 to ensure the stability of the crankcase 5 and improve the measurement accuracy. At the same time, when the slider 31 moves, the position of the pointer 33 on the scale 36 is observed and the scale value is read to obtain the distance between the drill hole on the crankcase 5 support leg 53 and the axis of the crankshaft mounting hole 521, thereby verifying whether the size requirements are met.

[0042] The positioning member 34 includes a guide rod 341, one end of which is provided with a boss 342, and a positioning block 343 is provided on the boss 342; a connecting seat 312 is provided on the slider 31, and a first groove 3121 and a second groove 3122 are sequentially opened in the connecting seat 312, the guide rod 341 is slidably connected in the first groove 3121, an elastic member 35 is sleeved on the guide rod 341, and the elastic member 35 is placed in the second groove 3122, one end of the elastic member 35 is connected to the boss 342, and the other end of the elastic member 35 is connected to the bottom of the second groove 3122.

[0043] When fixing the crankcase 5, the positioning hole is placed in the drilled hole of the crankcase 5 support leg 53, and the elastic member 35 is used at the same time to make the boss 342 abut against the support leg 53 of the crankcase 5. Due to the different heights of the crankcase 5 support legs, the positioning member 34 can move up and down by sliding along the first groove 3121 through the guide rod 341, so that the end of the crankshaft mounting seat 52 can abut against the operating table 1, which is convenient for the subsequent measurement of the depth of the crankshaft mounting hole 521.

[0044] Reference Figure 1 and Figures 4 - 7The measuring mechanism includes a shell 48, a sleeve rod 44, a telescopic rod 45, an inner rod 46, a third driving member 42 and a third driving member 42. The shell 48 is connected to the output end of the second driving member 41, the sleeve rod 44 is connected to an end of the shell 48 away from the second driving member 41, the telescopic rod 45 slides and penetrates in the sleeve rod 44, the third driving member 42 and the fourth driving member 43 are arranged in the shell 48, and the output end of the third driving member 42 is connected to the telescopic rod 45; the inner rod 46 slides and penetrates in the telescopic rod 45, and the output end of the fourth driving member 43 is connected to the inner rod 46; a plurality of measuring members 47 are arranged between the sleeve and the telescopic rod 45.

[0045] When measuring the aperture, the telescopic rod 45 is moved by the third driving member 42, so that the multiple measuring members 47 abut against the inner wall of the measured hole, ensuring that the measuring mechanism is coaxially arranged with the measured hole, thereby improving the measurement accuracy; when measuring the depth of the hole, the measuring member 47 abuts against the top of the hole, and the inner rod 46 is moved by the fourth driving member and abuts against the operating table 1, thereby realizing the measurement of the depth of the hole.

[0046] The measuring member 47 includes a first support rod 471 and a second support rod 471 which are hinged to each other. The end of the first support rod 471 is hinged to the side wall of the sleeve rod 44. A limit platform 451 is provided at one end of the telescopic rod 45 located outside the sleeve rod 44. The end of the second support rod 471 is hinged to the side wall of the limit platform 451. When measuring, the telescopic rod 45 is moved so that the outer side of the hinge between the first support rod 471 and the second support rod 471 abuts against the inner wall of the measured hole.

[0047] The telescopic rod 45 is moved so that the outer side of the hinge between the first support rod 471 and the second support rod 471 abuts against the inner wall of the measured hole, thereby ensuring that the measuring mechanism is coaxial with the measured hole and the accuracy of the measurement.

[0048] A first paving groove 441 for accommodating the first supporting rod 471 is formed on the outer wall of the sleeve rod 44 , and a second paving groove 452 for accommodating the second supporting rod 471 is formed on the outer wall of the limiting platform 451 .

[0049] By providing the first clearance groove 441 and the second clearance groove 452 , the space occupied by the measuring member 47 is reduced, while the measuring range of the measuring member 47 is increased.

[0050] A control terminal is disposed in the housing 48 , and a touch sensor 49 is disposed at the connection between the first support rod 471 and the second support rod 471 . The control terminal is electrically connected to the touch sensor 49 .

[0051] When the telescopic rod 45 moves, the touch sensor 49 contacts the inner wall of the measuring hole and transmits a signal to the control terminal. The control terminal calculates the aperture size of the measured hole according to the moving distance of the telescopic rod 45, thereby improving the measurement efficiency.

[0052] The implementation principle of a crankcase 5 size detection device in an embodiment of the present application is: first, the crankcase 5 is fixed at an angle, the crankshaft mounting seat 52 is placed in the fixing seat 21, and the positioning block 343 is placed in the drilled hole of the crankcase 5 support leg 53, and the crankcase 5 is pressed so that the end of the crankshaft mounting seat 52 abuts against the operating table 1, and the first driving member 24 drives the push rod to move and drives the sleeve 22 to move, and the inclined groove 221 in the sleeve 22 cooperates with the wedge-shaped protrusion 2111, so that the elastic tooth 211 abuts against the outer wall of the crankshaft mounting seat 52, and the slider 31 is fixed by using the locking member 32, thereby fixing the crankcase 5.

[0053] When the inner diameter of the hole is measured, the second driving member 41 drives the measuring end of the measuring mechanism to move into the hole, and the third driving member 42 drives the telescopic rod 45 to move, so that the first support rod 471 and the second support rod 471 hinged to each other shrink. When the touch sensor 49 at the connection between the first support rod 471 and the second support rod 471 abuts against the inner wall of the hole, the aperture size is calculated according to the moving distance of the telescopic rod 45 through the control terminal.

[0054] When measuring the depth of the hole, the third driving member 42 drives the telescopic rod 45 to move, so that the limit platform 451 abuts against the end surface of the sleeve rod 44. At this time, the second support rod 471 and the telescopic rod 45 are perpendicular to each other. The second driving member 41 drives the measuring mechanism to move, so that the second support rod 471 abuts against the end surface of the measured hole. The fourth driving member 43 drives the inner rod 46 to move, so that the end of the inner rod 46 abuts against the operating table 1, and the depth dimension of the hole can be measured.

[0055] Although the embodiments of the present application have been shown and described above, it can be understood that the above embodiments are exemplary and cannot be understood as limitations on the present application. Ordinary technicians in this field can change, modify, replace and modify the above embodiments within the scope of the present application.

Claims

1. A crankcase (5) dimension detection device, characterized in that: It comprises an operating table (1), on which a bracket (11) is arranged; A fixing assembly (2) is arranged on the operating table (1) and is used to fix the crankcase (5); A first measuring component (3) is arranged on the operating table (1) and is located on both sides of the fixing component (2); The second measuring component (4) is arranged on the bracket (11) and is located above the fixing component (2); the first measuring component (3) comprises a second driving member (41) fixed on the bracket (11); and a measuring mechanism is arranged at an output end of the second driving member (41).

2. The crankcase (5) dimension detection device according to claim 1, characterized in that: The fixing assembly (2) comprises a fixing seat (21) arranged on the operating table (1); a plurality of elastic teeth (211) are arranged at one end of the fixing seat (21) away from the operating table (1); a wedge-shaped protrusion (2111) is arranged on the outer side of the end of the elastic tooth (211); a sleeve (22) is slidably sleeved on the fixing seat (21); an inclined sink groove (221) cooperating with the wedge-shaped protrusion (2111) is arranged in the sleeve (22); a pushing frame (23) is arranged on the sleeve (22); the pushing frame (23) penetrates through and is slidably connected to the operating table (1); a first driving member (24) is arranged below the operating table (1); an output end of the first driving member (24) is connected to the pushing frame (23).

3. The crankcase (5) dimension detection device according to claim 1, characterized in that: The first measuring component (3) comprises a slider (31), a clamping block (311) is arranged at the bottom of the slider (31), guide grooves (12) are provided on both sides of the fixed component (2) on the operating table (1), the clamping block (311) is slidably connected in the guide grooves (12), a positioning piece (34) for fixing the support leg (53) of the crankcase (5) is arranged at one end of the slider (31) close to the fixed component (2), and a locking piece (32) is arranged at one end of the slider (31) away from the fixed component (2); a pointer (33) is arranged on one side of the slider (31), and a scale (36) corresponding to the pointer (33) is arranged on the operating table (1).

4. The crankcase (5) dimension detection device according to claim 3, characterized in that: The positioning member (34) comprises a guide rod (341), one end of which is provided with a boss (342), and a positioning block (343) is provided on the boss (342); a connecting seat (312) is provided on the sliding block (31), and a first sink groove (3121) and a second sink groove (3122) are sequentially provided in the connecting seat (312), the guide rod (341) is slidably connected in the first sink groove (3121), an elastic member (35) is sleeved on the guide rod (341), and the elastic member (35) is placed in the second sink groove (3122), one end of the elastic member (35) is connected to the boss (342), and the other end of the elastic member (35) is connected to the bottom of the second sink groove (3122).

5. The crankcase (5) dimension detection device according to claim 1, characterized in that: The measuring mechanism comprises a housing (48), a sleeve rod (44), a telescopic rod (45), an inner rod (46), a third driving member (42) and a third driving member (42); the housing (48) is connected to an output end of the second driving member (41); the sleeve rod (44) is connected to an end of the housing (48) away from the second driving member (41); the telescopic rod (45) is slidably and penetrated in the sleeve rod (44); the third driving member (42) and a fourth driving member (43) are arranged in the housing (48); the output end of the third driving member (42) is connected to the telescopic rod (45); the inner rod (46) is slidably and penetrated in the telescopic rod (45); the output end of the fourth driving member (43) is connected to the inner rod (46); and a plurality of measuring members (47) are arranged between the sleeve and the telescopic rod (45).

6. The crankcase (5) dimension detection device according to claim 1, characterized in that: The measuring member (47) comprises a first support rod (471) and a second support rod (471) which are hinged to each other, the end of the first support rod (471) being hinged to the side wall of the sleeve rod (44), a limiting platform (451) being arranged at one end of the telescopic rod (45) located outside the sleeve rod (44), and the end of the second support rod (471) being hinged to the side wall of the limiting platform (451); during measurement, the telescopic rod (45) is moved so that the outer side of the hinged part of the first support rod (471) and the second support rod (471) abuts against the inner wall of the measured hole.

7. The crankcase (5) dimension detection device according to claim 6, characterized in that: The outer wall of the sleeve rod (44) is provided with a first clearance groove (441) for accommodating the first support rod (471), and the outer wall of the limiting platform (451) is provided with a second clearance groove (452) for accommodating the second support rod (471).

8. The crankcase (5) dimension detection device according to claim 6, characterized in that: A control terminal is arranged in the housing (48), a touch sensor (49) is arranged at the connection between the first support rod (471) and the second support rod (471), and the control terminal is electrically connected to the touch sensor (49).

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