A steering gear housing gauge

Abstract

The present application relates to the technical field of testing tool manufacturing, and discloses a steering gear housing testing tool, which comprises a base, a detection assembly is fixedly connected to the base, a plurality of detection assemblies are arranged on the base, the plurality of detection assemblies are arranged in a closed manner to form a detection area, the detection assembly comprises a measuring rod, and a clamping assembly and a positioning assembly are further installed on the base. The present application has the following advantages and effects: the steering gear housing is located in the middle of the detection area, the clamping assembly clamps the outer wall of the steering gear housing to limit the movement of the housing, the positioning assembly extends into the mounting hole to limit the random rotation of the housing, a plurality of measuring rods move towards the housing at the same time, a displacement sensor monitors the moving distance of the measuring rods, the distance of the forward movement of the measuring rods is certain, when the height of the measuring rods and the distance between the measuring rods are certain, the relative position between the housing and the measuring rods is determined to quickly determine whether the size of the housing meets the preset standard, thereby saving time and effort.

Description

Technical Field

[0001] This invention relates to the field of fixture manufacturing technology, and in particular to a steering gear housing fixture. Background Technology

[0002] The automotive steering system is a series of devices used to change or maintain the driving or reversing direction of a vehicle. The steering gear is an important component of the automotive steering system, including the housing, steering gear, and steering rack. The steering gear housing mainly serves to fix and protect the rack and input shaft, and also limits the rack's travel. The dimensions of the steering gear housing need to meet standards to avoid affecting subsequent processing and use. Therefore, the cast steering gear housing needs to be measured. In the current technology, operators usually use measuring tools such as micrometers to check the dimensions of the steering gear housing. However, manual measurement with a micrometer is inconvenient, labor-intensive, inefficient, and prone to errors. Therefore, there is a need for a device that can quickly and accurately measure the dimensions of the steering gear housing. Summary of the Invention

[0003] The purpose of this invention is to provide a steering gear housing inspection tool that facilitates quick inspection of whether the height and outer diameter of the machined steering gear housing meet the standards.

[0004] The above-mentioned technical objective of the present invention is achieved through the following technical solution: A base is included, on which a detection component is fixedly connected. Several detection components are arranged in a ring to form a detection area. A support seat fixedly connected to the base is located in the center of the detection area. A clamping component is fixedly connected to the base near the detection component. The detection component includes a support frame and a measuring rod slidably connected to the support frame. A motor driving the measuring rod is installed at the bottom of the base. A transmission component connects the motor and the measuring rod. A displacement sensor is fixedly connected to the support frame along the sliding direction of the measuring rod. A detection cavity is provided inside the measuring rod. A pressure sensor is fixedly connected to the end of the measuring rod inside the cavity. A detection plate extending from the measuring rod is slidably connected inside the detection cavity. The detection plate and the inner wall of the measuring rod form an airtight cavity. A telescopic spring is fixedly connected between the detection plate and the measuring rod inside the airtight cavity. An air pressure sensor is installed inside the airtight cavity. A drop rod is slidably connected to the measuring rod. The measuring rod has a sliding hole through which the drop rod slides. A sensing block is slidably connected to the drop rod. A proximity sensor close to the drop rod is fixedly connected to the measuring rod. A baffle restricting the drop rod from falling is fixedly connected to the side of the detection plate away from the airtight cavity. The air pressure sensor and the pressure sensor are connected to a display.

[0005] By adopting the above technical solution, the steering gear housing is placed upside down on the support base, with the steering gear housing located in the center of the detection area, so that the steering wheel mounting chamber of the steering gear housing faces upward. The clamping assembly clamps the steering gear housing to restrict its movement. The motor drives the measuring rod to move closer to the housing, and the displacement sensor monitors the moving distance of the measuring rod. When the forward movement distance of the measuring rod is constant, and the height and distance between the measuring rods are constant, the relative position between the housing and the measuring rod can be used to determine whether the size of the housing meets the preset standard. The following measurement results will appear during the movement of the measuring rod:

[0006] 1. The height of the preset probe is slightly higher than the height of the top of the standard-sized steering gear housing, that is, a height error gap slightly higher than the standard size is left. When the height of the housing being tested is within the height error gap, the probe can continue to move forward to the top of the housing. When the height of the housing being tested is higher than the preset standard height range, that is, when the height of the housing is higher than the height of the probe, the end of the probe abuts against the outer wall of the housing. The pressure sensor detects that there is a squeezing force at the end of the probe and sends a signal to the display.

[0007] 2. When the height of the housing being tested is equal to or lower than the preset height of the measuring rod, the measuring rod continues to move forward. When the end of the measuring rod extends above the housing, the edge of the housing abuts against the measuring plate. The measuring plate moves away from the measuring rod. The airtight cavity is filled with gas. The air pressure sensor monitors the air pressure in the airtight cavity. After the airtight cavity is compressed, the air pressure inside the cavity increases. The standard value of the air pressure in the airtight cavity is set within a certain range (when dimensional errors are allowed). When the air pressure is within this range, the size of the housing is the standard size. The air pressure sensor sends signal two to the display. Since the distance the measuring rod moves forward is constant, when the air pressure in the airtight cavity is greater than the range of the standard air pressure value, it means that the distance the measuring plate retracts inward is too long, the relative distance between the measuring plate and the end of the measuring rod is too large, and the outer diameter of the housing is greater than the preset standard size. When the air pressure in the airtight cavity is less than the range of the standard air pressure value, it means that the distance the measuring plate retracts inward is insufficient, the relative distance between the measuring plate and the end of the measuring rod is too small, and the outer diameter of the housing is greater than the preset standard size.

[0008] 3. When the height of the housing being tested is lower than the preset standard height, the probe continues to move forward. When the end of the probe extends above the housing, the edge of the housing abuts against the detection plate. The detection plate moves away from the probe and the baffle releases the restriction on the bottom of the probe. The probe falls through the sliding holes on the upper and lower sides of the probe and contacts the upper surface of the housing. The distance the probe falls through the bottom of the probe determines the detection height difference between the probe and the housing. Since the preset height of the probe is slightly higher than the height of the top of the standard-sized steering gear housing, that is, there is a height error gap slightly higher than the standard size, when the height of the probe falling through the bottom of the probe is less than or equal to the height error gap, the height of the housing is within the standard range, and the error allowable range is slightly greater than the height error gap to allow the height of the housing to be slightly lower than the standard value of the housing. When the detection height difference exceeds this allowable range, the falling probe drives the sensing block to approach the proximity sensor. After the proximity sensor detects it, it sends a signal to the display.

[0009] 4. When the height of the housing being tested is equal to or lower than the preset standard height, the probe continues to move forward. When the pressure sensor detects the squeezing force when the end of the probe rises above the housing, it indicates that there is an uneven part on the surface of the housing.

[0010] In summary, when signal one is displayed on the monitor, it indicates that the height of the housing is higher than the standard range, or when the measuring rod is moved above the housing, it indicates that there are uneven protrusions on the housing surface; when signal three is displayed on the monitor, it indicates that the height of the housing is lower than the standard range; when only signal two is displayed on the monitor, it indicates that the outer diameter and height of the housing are within the standard range; after the measuring rod moves forward a certain distance, the displacement sensor monitors and controls the motor to stop rotating.

[0011] A further configuration of the present invention is as follows: the transmission assembly includes a pulley driven by the motor, the pulley being rotatably connected to the bottom of the support frame, a rotating shaft being fixedly connected to the middle of the pulley, a strip-shaped toothed groove being provided on the measuring rod, and a gear being fixedly connected to the rotating shaft and meshing with the strip-shaped toothed groove.

[0012] By adopting the above technical solution, the motor drives the pulley to rotate, the pulley drives the gear to rotate through the shaft, and the gear rotates to drive the measuring rod that meshes with the toothed groove to move forward or backward. The pulleys at the bottom of multiple support frames rotate together through the transmission belt, thereby realizing the synchronous movement of multiple measuring rods through the transmission assembly. This enables multi-directional detection of the steering gear housing at the same time, improving the accuracy of the detection.

[0013] A further configuration of the present invention is as follows: the clamping assembly comprises three clamps arranged in a triangular shape. Each clamping assembly includes a second support frame fixedly connected to the base and a screw threadedly connected to the second support frame. A clamp is hinged to one end of the screw extending from the second support frame. A connecting plate is hinged between the clamp and the second support frame. A second pulley is threadedly connected to the bottom of the screw, and a belt is drivingly connected between the second pulley and the first pulley.

[0014] By adopting the above technical solution, after the steering gear housing is placed, the motor drives pulley one to rotate and pulley two to rotate at the same time. When pulley two rotates, it drives the screw connected to it to move up and down. When the screw moves up and down, the end of the screw drives the clamp to rotate and abut against the steering gear housing to clamp it. The three clamping components stably clamp the housing and avoid the housing from moving randomly and causing detection errors.

[0015] A further feature of the present invention includes a positioning assembly comprising two positioning rods slidably connected to the base and disposed opposite to each other. Each positioning rod has a strip-shaped toothed groove on a different side. The strip-shaped toothed grooves mesh with a gear. A rotating shaft is fixedly connected to the middle of the gear, and a pulley is fixedly connected to the bottom of the rotating shaft. A belt is drivingly connected between the pulley and the pulley.

[0016] By adopting the above technical solution, after the steering gear housing is placed, the motor drives pulley one to rotate and simultaneously drives pulley three to rotate. The rotation of pulley three drives gear two to rotate. The rotation of gear two drives the positioning rod to move forward through the meshing strip tooth groove two. The strip tooth groove two on the two positioning rods is located on different sides, so when gear two rotates, it drives the two positioning rods to move in opposite directions. The two positioning rods move forward relative to each other and pass through the mounting hole at the bottom of the steering gear housing to perform angular positioning of the steering gear housing, preventing the steering gear housing from rotating arbitrarily.

[0017] A further configuration of the present invention is as follows: the measuring rod includes a buffer rod and a sleeve rod slidably connected to the buffer rod and sleeved outside the buffer rod; the rack is fixedly connected to the sleeve rod; the sleeve rod has a buffer cavity for the end of the measuring rod to slide into; and a buffer spring is fixedly connected between one end of the measuring rod located in the buffer cavity and the buffer cavity.

[0018] By adopting the above technical solution, the gear drives the measuring rod to move forward through the rack on the sleeve rod. When the height of the housing is greater than the height of the measuring rod, the wall of the housing abuts against the measuring rod, and the measuring rod and the wall of the housing squeeze each other. At this time, the buffer rod is buffered to a certain extent by the action of the buffer spring. The buffer rod moves slightly inward into the sleeve rod to avoid damage to the measuring rod due to compression and to extend the service life of the device.

[0019] A further feature of the present invention is that: side plates located at the connection between the detection plate and the measuring rod are fixedly connected to both sides of the detection plate, and the measuring rod is provided with a sliding cavity for the side plates to slide back and forth.

[0020] By adopting the above technical solution, the detection plate moves into the airtight cavity under the obstruction of the outer wall of the shell, making the space inside the airtight cavity smaller and the air pressure larger. The side plate is used to ensure that the airtight cavity remains closed while the detection plate moves.

[0021] A further feature of the present invention is that: a positioning column is fixedly connected to the base, and three positioning columns are arranged in a triangular shape, with the support seat located in the middle of the three positioning columns.

[0022] By adopting the above technical solution, three mounting holes are provided on the outer contour of the steering gear housing. The three mounting holes are aligned with the three positioning posts to achieve the positioning and placement of the steering gear housing.

[0023] A further feature of the present invention is that the side of the drop rod closest to the detection plate is an inclined surface, and a limiting plate is fixedly connected to one end of the drop rod extending from the measuring rod.

[0024] By adopting the above technical solution, when the measuring rod returns, the detection plate moves to the initial position under the action of the telescopic spring. When the detection plate moves, the baffle contacts the inclined surface, causing the drop rod to move upward until the drop rod returns to the initial position. The drop rod moves to the bottom and contacts the baffle again. The limiting plate is used to prevent the drop rod from detaching from the measuring rod.

[0025] The beneficial effects of this invention are as follows: the steering gear housing is located in the middle of the detection area. The clamp clamps the outer wall of the steering gear housing to restrict its movement. At the same time, the positioning rod extends into the mounting hole to restrict the housing from rotating freely. The motor drives multiple measuring rods to move towards the housing simultaneously. The displacement sensor monitors the moving distance of the measuring rods, ensuring that the distance the measuring rods move forward is constant. When the height of the measuring rods and the distance between the measuring rods are constant, the relative position between the housing and the measuring rods is judged to determine whether the size of the housing meets the preset standard. When signal one is displayed on the display, it indicates that the height of the housing is higher than the standard range. Or, when the measuring rod moves to the top of the housing, it indicates that there are uneven protrusions on the surface of the housing. When signal three is displayed on the display, it indicates that the height of the housing is lower than the standard range. When only signal two is displayed on the display, it indicates that the outer diameter and height of the housing are within the standard value range. Attached Figure Description

[0026] To more clearly illustrate the technical solutions in the embodiments of the present invention, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0027] Figure 1 This is a schematic diagram of the structure of Embodiment 1.

[0028] Figure 2 This is a schematic diagram of the connection relationship between the measuring rod and the rotating shaft in Embodiment 1.

[0029] Figure 3 This is a schematic diagram of the internal structure of the measuring rod in Embodiment 1.

[0030] Figure 4 yes Figure 3 Enlarged view of point A.

[0031] Figure 5 A schematic diagram showing the connection between the clamp and the support frame 2 in Example 1.

[0032] Figure 6 A schematic diagram of the bottom structure of this embodiment 1.

[0033] Figure 7 Schematic diagram of steering gear housing structure.

[0034] In the diagram: 1. Base; 2. Detection area; 3. Support frame one; 4. Measuring rod; 41. Buffer rod; 42. Sleeve rod; 5. Clamping assembly; 51. Support frame two; 52. Screw; 53. Fixture; 54. Connecting plate; 6. Support seat; 7. Transmission assembly; 71. Belt pulley one; 72. Rotating shaft one; 73. Strip toothed groove one; 74. Gear one; 75. Belt pulley two; 76. Belt pulley three; 77. Motor; 9. Detection cavity; 10. Pressure sensor; 11. Detection plate; 12. Airtight cavity; 13. Telescopic spring; 14. Air pressure sensor; 15. Drop rod; 16. Sensing block; 17. Proximity sensor; 18. Baffle; 19. Buffer cavity; 20. Side plate; 21. Sliding cavity; 22. Buffer spring; 23. Displacement sensor; 24. Positioning rod; 25. Limiting plate; 26. Positioning column. Detailed Implementation

[0035] The technical solution of the present invention will now be clearly and completely described with reference to specific embodiments. Obviously, the described embodiments are merely some embodiments of the present invention, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the scope of protection of the present invention.

[0036] Example 1: A steering gear housing inspection fixture, such as Figure 1-6 As shown, the device includes a base 1, on which a detection assembly is fixedly connected. Several detection assemblies are arranged in an enclosed manner to form a detection area 2. A support 6 is fixedly connected to the base 1 in the center of the detection area 2. A clamping assembly 5 is fixedly connected to the base 1 near the detection assembly. The detection assembly includes a support frame 3 and a measuring rod 4 slidably connected to the support frame 3. A motor 77 is installed at the bottom of the base 1 to drive the measuring rod 4. A transmission assembly 7 connects the motor 77 and the measuring rod 4. A displacement sensor 23 is fixedly connected to the support frame 3 along the sliding direction of the measuring rod 4. A detection cavity 9 is provided inside the measuring rod 4, and a device fixedly connected to the end of the measuring rod 4 is located inside the detection cavity 9. The pressure sensor 10 is located in the detection cavity 9. A detection plate 11 extending from the measuring rod 4 is slidably connected to the detection cavity 9. The detection plate 11 and the inner wall of the measuring rod 4 form an airtight cavity 12. A telescopic spring 13 is fixedly connected between the detection plate 11 and the measuring rod 4 in the airtight cavity 12. A pressure sensor 14 is installed in the airtight cavity 12. A drop rod 15 is slidably connected to the measuring rod 4. A sensing block 16 is slidably connected to the drop rod 15. A proximity sensor 17 is fixedly connected to the measuring rod 4 near the drop rod 15. A baffle 18 is fixedly connected to the side of the detection plate 11 away from the airtight cavity 12 to limit the drop rod 15 from falling. The pressure sensor 14, the proximity sensor, and the pressure sensor 10 are connected to a display.

[0037] Furthermore, the transmission assembly 7 includes a pulley 71 driven by a motor 77, the pulley 71 being rotatably connected to the bottom of the support frame 3, a rotating shaft 72 being fixedly connected to the middle of the pulley 71, a strip-shaped toothed groove 73 being provided on the measuring rod 4, and a gear 74 being fixedly connected to the rotating shaft 72 and meshing with the strip-shaped toothed groove 73.

[0038] Furthermore, the clamping assembly 5 is provided with three parts arranged in a triangular shape. The clamping assembly 5 includes a second support frame 51 fixedly connected to the base 1 and a screw 52 threadedly connected to the second support frame 51. A clamp 53 is hinged to one end of the screw 52 extending out of the second support frame 51. A connecting plate 54 is hinged between the clamp 53 and the second support frame 51. A second pulley 75 is threadedly connected to the bottom of the screw 52. A belt is connected between the second pulley 75 and the first pulley 71.

[0039] Furthermore, it also includes a positioning component, which includes two positioning rods 24 that are slidably connected to the base 1 and are arranged opposite to each other. The two positioning rods 24 are respectively provided with strip-shaped toothed grooves on different sides. The strip-shaped toothed grooves mesh with gears. A rotating shaft is fixedly connected to the middle of the gears. A pulley 76 is fixedly connected to the bottom of the rotating shaft. A belt 2 is connected between the pulley 76 and the pulley 71.

[0040] Furthermore, the measuring rod 4 includes a buffer rod 41 and a sleeve rod 42 that is slidably connected to the buffer rod 41 and sleeved outside the buffer rod 41. A rack is fixedly connected to the sleeve rod 42. The sleeve rod 42 is provided with a buffer cavity 19 for the end of the measuring rod 4 to slide into. A buffer spring 22 is fixedly connected between one end of the measuring rod 4 located in the buffer cavity 19 and the buffer cavity 19.

[0041] Furthermore, the detection plate 11 is fixedly connected to the side plates 20 located at the connection between the detection plate 11 and the measuring rod 4 on both sides, and the measuring rod 4 is provided with a sliding cavity 21 for the side plates 20 to slide back and forth.

[0042] Furthermore, a positioning post 26 is fixedly connected to the base 1. There are three positioning posts 26 arranged in a triangular shape, and the support base 6 is located in the middle of the three positioning posts 26.

[0043] Furthermore, the side of the drop bar 15 closest to the detection plate 11 is designed with an inclined surface, and a limit plate 25 is fixedly connected to one end of the drop bar 15 extending from the measuring rod 4.

[0044] Working principle: Combining Figure 7 The steering gear housing is placed upside down on the support base 6, with the steering gear housing located in the middle of the detection area 2, so that the steering wheel mounting chamber of the steering gear housing faces upward. The motor 77 is started, and the motor 77 drives pulley 1 71 to rotate. At the same time, pulley 1 71 drives pulley 2 75 and pulley 3 76 to rotate through belt 1 and belt 2. When pulley 2 75 rotates, it drives screw 52 to move upward. The end of screw 52 drives clamp 53 to rotate and abut against the steering gear housing for clamping. When pulley 3 76 rotates, it drives positioning rod 24 to move forward through the meshing strip tooth groove 2. Positioning rod 24 moves forward and passes through the mounting hole at the bottom of the steering gear housing to perform angular positioning of the steering gear housing. Pulley 1 71 drives measuring rod 4 to move closer to the housing. Displacement sensor 23 monitors the moving distance of measuring rod 4. When the moving distance of measuring rod 4 is constant, and the height of measuring rod 4 and the distance between measuring rods 4 are constant, the relative position between the housing and measuring rod 4 can be used to determine whether the size of the housing meets the preset standard.

[0045] 1. When the height of the housing being tested is higher than the preset standard height range, that is, when the height of the housing is higher than the height of the measuring rod 4, the end of the measuring rod 4 abuts against the outer wall of the housing, and the pressure sensor 10 detects that there is a squeezing force at the end of the measuring rod 4 and sends a signal to the display.

[0046] 2. When the height of the housing being tested is equal to or lower than the preset height of the measuring rod 4, the measuring rod 4 continues to move forward. When the end of the measuring rod 4 extends above the housing, the edge of the housing abuts against the measuring plate 11. The measuring plate 11 moves away from the measuring rod 4. The airtight cavity 12 is filled with gas. The air pressure sensor 14 monitors the air pressure in the airtight cavity 12. When the air pressure in the airtight cavity 12 is greater than the range of the air pressure standard value, it means that the distance inward contraction of the measuring plate 11 is too long, the relative distance between the measuring plate 11 and the end of the measuring rod 4 is too large, and the outer diameter of the housing is greater than the preset standard size. When the air pressure in the airtight cavity 12 is less than the range of the air pressure standard value, it means that the distance inward contraction of the measuring plate 11 is insufficient, the relative distance between the measuring plate 11 and the end of the measuring rod 4 is too small, and the outer diameter of the housing is greater than the preset standard size.

[0047] 3. When the end of the measuring rod 4 extends towards the top of the housing, the edge of the housing abuts against the detection plate 11. The detection plate 11 moves away from the end of the measuring rod 4, and at the same time the baffle 18 releases the restriction on the bottom end of the falling rod 15. The falling rod 15 falls and contacts the upper surface of the housing. The distance the falling rod 15 falls past the bottom of the measuring rod 4 is used to determine the detection height difference between the measuring rod 4 and the housing. When the detection height difference exceeds this allowable range, the falling rod 15 drives the sensing block 16 to approach the proximity sensor 17. After the proximity sensor 17 senses it, it sends a signal to the display.

[0048] 4. When the height of the housing being tested is equal to or lower than the preset standard height, the probe 4 continues to move forward. When the end of the probe 4 rises above the housing and the pressure sensor 10 detects the squeezing force, it indicates that there is an uneven part on the surface of the housing.

[0049] Therefore, if only signal two is displayed on the monitor, it means that the outer diameter and height of the casing are within the standard range.

Claims

1. A steering gear housing inspection fixture, comprising a base (1), characterized in that: A detection component is fixedly connected to the base (1). Several detection components are provided, and the several detection components enclose a detection area (2). A support base (6) is fixedly connected to the base (1) in the middle of the detection area (2). A clamping component (5) is fixedly connected to the base (1) near the detection component. The detection component includes a support frame (3) and a measuring rod (4) slidably connected to the support frame (3). A motor (77) for driving the measuring rod (4) to move is installed at the bottom of the base (1). A transmission component (7) is connected between the motor (77) and the measuring rod (4). A displacement sensor is fixedly connected to the support frame (3) along the sliding direction of the measuring rod (4). (23) The measuring rod (4) is provided with a detection cavity (9), and a pressure sensor (10) is fixedly connected to the end of the measuring rod (4) in the detection cavity (9). A detection plate (11) extending out of the measuring rod (4) is slidably connected in the detection cavity (9). The detection plate (11) and the inner wall of the measuring rod (4) form an airtight cavity (12). A telescopic spring (13) is fixedly connected between the detection plate (11) and the measuring rod (4) in the airtight cavity (12). A pressure sensor (14) is installed in the airtight cavity (12). A drop rod (15) is slidably connected on the measuring rod (4). The measuring rod (4) is provided with a sliding hole through which the drop rod (15) slides. A sensing block (16) is slidably connected to the drop bar (15). A proximity sensor (17) is fixedly connected to the measuring rod (4) near the drop bar (15). A baffle (18) is fixedly connected to the side of the detection plate (11) away from the airtight cavity (12) to restrict the drop bar (15) from falling. The air pressure sensor (14), the proximity sensor (17), and the pressure sensor (10) are connected to a display. The height of the measuring rod (4) is preset to be slightly higher than the height of the top of the standard-sized steering gear housing. During measurement, the measuring rod (4) moves towards the housing. When the height of the measuring rod (4) and the distance between the measuring rods (4) are constant, the height of the housing can be determined by the relative position between the housing and the measuring rod (4). Whether the height and outer diameter meet the preset standards: When the height of the shell is higher than the height of the measuring rod (4), the end of the measuring rod (4) abuts against the outer wall of the shell, and the pressure sensor (10) detects that there is a squeezing force at the end of the measuring rod (4). When the height of the shell is equal to or lower than the preset height of the measuring rod (4), the edge of the shell abuts against the detection plate (11), and the detection plate (11) moves away from the measuring rod (4). The air pressure sensor (14) monitors the air pressure in the airtight cavity (12) and judges whether the outer diameter is qualified. At the same time, the baffle (18) releases the restriction on the bottom of the drop rod (15), and the drop rod (15) falls and contacts the upper surface of the shell. The detection height difference between the measuring rod (4) and the shell is judged by the distance the drop rod (15) falls through the bottom of the measuring rod (4).

2. The steering gear housing inspection fixture according to claim 1, characterized in that: The transmission assembly (7) includes a pulley (71) driven by the motor (77), the pulley (71) is rotatably connected to the bottom of the support frame (3), a rotating shaft (72) is fixedly connected to the middle of the pulley (71), the measuring rod (4) is provided with a strip toothed groove (73), and a gear (74) that meshes with the strip toothed groove (73) is fixedly connected to the rotating shaft (72).

3. A steering gear housing inspection fixture according to claim 2, characterized in that: The clamping assembly (5) has three parts arranged in a triangular shape. The clamping assembly (5) includes a second support frame (51) fixedly connected to the base (1) and a screw (52) threadedly connected to the second support frame (51). The screw (52) extends out of one end of the second support frame (51) and is hinged to a clamp (53). A connecting plate (54) is hinged between the clamp (53) and the second support frame (51). A second pulley (75) is threaded to the bottom of the screw (52). A belt is connected between the second pulley (75) and the first pulley (71).

4. A steering gear housing inspection fixture according to claim 2, characterized in that: It also includes a positioning component, which includes two positioning rods (24) that are slidably connected to the base (1) and are arranged opposite to each other. The two positioning rods (24) are respectively provided with strip-shaped toothed grooves on different sides. The strip-shaped toothed grooves are meshed with gears. A rotating shaft is fixedly connected to the middle of the gears. A pulley (76) is fixedly connected to the bottom of the rotating shaft. A belt is connected between the pulley (76) and the pulley (71).

5. A steering gear housing inspection fixture according to claim 2, characterized in that: The measuring rod (4) includes a buffer rod (41) and a sleeve rod (42) slidably connected to the buffer rod (41) and sleeved outside the buffer rod (41). The strip toothed groove (73) is fixedly connected to the sleeve rod (42). The sleeve rod (42) is provided with a buffer cavity (19) for the end of the measuring rod (4) to slide into. A buffer spring (22) is fixedly connected between one end of the measuring rod (4) located in the buffer cavity (19) and the buffer cavity (19).

6. A steering gear housing inspection fixture according to claim 1, characterized in that: The detection plate (11) is fixedly connected to the side plates (20) located at the connection between the detection plate (11) and the measuring rod (4) on both sides. The measuring rod (4) is provided with a sliding cavity (21) for the side plates (20) to slide back and forth.

7. A steering gear housing inspection fixture according to claim 1, characterized in that: The base (1) is fixedly connected with a positioning column (26), and there are three positioning columns (26) arranged in a triangular shape. The support seat (6) is located in the middle of the three positioning columns (26).

8. A steering gear housing inspection fixture according to claim 1, characterized in that: The drop bar (15) is inclined on the side near the detection plate (11), and the drop bar (15) extends out of the end of the measuring rod (4) and is fixedly connected to a limiting plate (25).

Images