A shell assembly detection device and method

Abstract

The present application relates to shell assembly detection technical field, specifically, a kind of shell assembly detection device and method.A kind of shell assembly detection device, comprising: upper detection unit, including upper cover body part, fixed part and multiple upper limit grooves;Fixed part and upper cover body part form upper limit groove along detection direction;Multiple upper limit grooves are circumferentially spaced on the circumferential side of fixed part and upper cover body part;Lower detection assembly, including lower cover body part and lower limit groove;Multiple lower limit grooves are circumferentially spaced on lower cover body part;Lower limit groove is oppositely arranged and communicated with upper limit groove along detection direction, forms accommodating groove;Rolling assembly is located in accommodating groove;In the first state of shell assembly detection device, shell assembly detection device is located in the detection groove of shell unit, and rolling assembly is rolled in detection groove along detection direction and inner circumferential wall of shell unit is matched.How to adapt to the tolerance of shell assembly, solve the problem that rigid gauge is stuck or damaged workpiece when detecting shell assembly center distance.

Description

Technical Field

[0001] This invention relates to the field of shell component testing technology, and more specifically, to a shell component testing device and method. Background Technology

[0002] The housing assembly includes the center housing, which is mainly used in the reduction drive shaft. As the skeleton of the drive axle, it plays a crucial role in gear precision positioning, load transmission, sealing and lubrication, and power steering. If the tolerance of the center distance of the center housing exceeds the standard value, it will affect the transmission of the reduction drive shaft. If the internal dimensions of the center housing are too large, there will be play during torsional transmission, concentrated stress points on the steel balls, localized indentations, and easy damage in a short period. Conversely, if its internal dimensions are too small, there will be no clearance between the steel balls, resulting in frictional heat during operation, rapidly accelerating wear, and thus affecting service life. Therefore, the dimensional accuracy of the center housing is extremely important.

[0003] Rigid fixtures are typically used to inspect the internal tolerances of the housing. In existing technologies, rigid fixtures are usually used to inspect the center distance of the housing assembly. When the center distance of the housing assembly to be inspected is too small, the rigid fixture is prone to getting stuck inside the housing when inspecting the internal tolerances, or the workpiece may be damaged due to sliding friction between the rigid fixture and the inside of the housing during the removal of the rigid fixture. Therefore, how to adapt to the tolerances of the housing assembly and solve the problem of rigid fixtures getting stuck or damaging the workpiece when inspecting the center distance of the housing assembly has become an urgent problem to be solved. Summary of the Invention

[0004] To address the issue of adaptive tolerances in shell components and the problem of rigid gauges jamming or damaging workpieces when inspecting the center distance of shell components, this invention provides a shell component inspection device and method.

[0005] In a first aspect, the present invention provides a shell assembly detection device, the shell assembly detection device comprising:

[0006] The upper detection unit includes an upper cover, a fixing part, and a plurality of upper limit slots; the fixing part is disposed on the upper cover and has the same central axis as at least a portion of the upper cover; the fixing part and the upper cover form the upper limit slots along the detection direction; the plurality of upper limit slots are circumferentially spaced on the periphery of the fixing part and the upper cover;

[0007] The lower detection component includes a lower cover and a lower limiting groove; the lower cover is detachably connected to the upper cover; a plurality of lower limiting grooves are spaced apart circumferentially on the lower cover; the lower limiting grooves are arranged opposite to and communicate with the upper limiting groove along the detection direction to form a receiving groove;

[0008] The rolling component is located within the receiving groove;

[0009] In the first state of the shell assembly detection device, the shell assembly detection device is located in the detection groove of the shell unit, and the rolling assembly rolls in the detection groove along the detection direction with the inner peripheral wall of the shell unit; wherein, the shell assembly includes the shell unit and the detection groove located in the shell unit.

[0010] Optionally, the fixing part includes a central body and a plurality of limiting bodies; the central body is connected to the upper cover part along the detection direction; the plurality of limiting bodies are circumferentially spaced on the periphery of the central body; adjacent limiting bodies enclose and form part of the upper limit groove; wherein, the side of the central body facing the limiting body is radially interference-fitted with the limiting body.

[0011] Optionally, the upper limit groove includes a first groove and a second groove that are connected along the detection direction; the first groove is disposed on the upper cover portion; the second groove is disposed between adjacent limiting bodies; the first groove and the second groove at least partially overlap along the detection direction; the first groove, the second groove and the lower limit groove are connected sequentially along the detection direction.

[0012] Optionally, the maximum depth of the first groove along the detection direction is greater than the maximum depth of the lower limit groove along the detection direction.

[0013] Optionally, the line connecting the two rolling components arranged opposite each other along the central axis of the central body passes through the central axis of the central body.

[0014] Optionally, the rolling assembly and the limiting body have a first gap in the circumferential direction; the rolling assembly and the central body have a second gap in the radial direction; the second gap is larger than the first gap.

[0015] Optionally, the rolling assembly has a gap with the upper cover portion and / or the lower cover portion along the axial direction; in the second state of the shell assembly detection device, the rolling assembly abuts against the lower cover portion along the axial direction and maintains a gap with the upper cover portion; in the first state, the rolling assembly is driven to move in a direction close to the lower cover portion, and the rolling assembly gradually separates from the lower cover portion and moves in a direction close to the upper cover portion.

[0016] Optionally, the thickness of the upper cover portion along the axial direction is greater than the thickness of the lower cover portion along the axial direction.

[0017] Optionally, the connecting unit is connected along the detection direction to the side of the upper cover portion away from the fixing portion.

[0018] Secondly, the present invention provides a shell component detection method, the shell component detection method comprising:

[0019] Started based on the detection command, the shell component detection device is placed in the detection slot of the shell unit;

[0020] Based on the fact that the shell component detection device is located in the detection groove, the shell component detection device is driven to move along the detection direction, and the rolling component rolls in cooperation with the inner peripheral wall of the shell unit in the detection groove;

[0021] The center distance of the shell unit is obtained based on the rolling engagement between the rolling component and the inner peripheral wall of the shell unit.

[0022] To address the issue of rigid gauges jamming or damaging workpieces when inspecting the center distance of shell components, this invention offers the following advantages:

[0023] Based on the rolling components located within the receiving groove formed by the upper and lower detection units, and the evenly distributed rolling components in the circumferential direction, the shell assembly detection device forms multi-point support in the circumferential direction. Simultaneously, based on the rolling components, the shell assembly detection device can automatically center within the detection groove. Furthermore, the rolling components adaptively adjust their distance from the inner circumferential wall of the shell unit along the detection direction within the detection groove, and roll in cooperation with the inner circumferential wall of the shell unit. This avoids rigid jamming caused by fluctuations in center distance tolerance, or prevents scratching of the inner circumferential wall of the shell unit. Therefore, when detecting shell assembly tolerances, the shell assembly detection device of this invention can adaptively adapt to the dimensions of the shell assembly, avoiding jamming or workpiece damage when rigid gauges detect the center distance of the shell assembly. Attached Figure Description

[0024] Figure 1 A schematic diagram of the structure of a shell component detection device according to one embodiment is shown;

[0025] Figure 2 A partial structural schematic diagram of a shell component detection device according to one embodiment is shown;

[0026] Figure 3 A cross-sectional view of a shell component detection device according to one embodiment is shown;

[0027] Figure 4 A front view of a shell component detection device according to one embodiment is shown;

[0028] Figure 5 A schematic diagram of the lower detection component structure of a shell component detection device according to one embodiment is shown;

[0029] Figure 6 A partial structural schematic diagram of the shell assembly of a shell assembly detection device according to an embodiment is shown;

[0030] Figure 7 A cross-sectional view of the shell assembly of a shell assembly detection device according to an embodiment is shown.

[0031] Reference numerals: 10, upper detection assembly; 11, connecting unit; 12, upper detection unit; 121, upper cover; 122, fixing part; 1221, central body; 1222, limiting body; 123, upper limit groove; 1231, first groove; 1232, second groove; 20, lower detection assembly; 21, lower cover; 22, lower limit groove; 30, rolling assembly; 40, shell assembly; 41, shell unit; 42, detection groove; 421, central groove; 422, sliding groove. Detailed Implementation

[0032] The invention will now be discussed with reference to several exemplary embodiments. It should be understood that these embodiments are described merely to enable those skilled in the art to better understand and thus implement the invention, and are not intended to imply any limitation on the scope of the invention.

[0033] As used herein, the term "comprising" and its variations are to be interpreted as open-ended terms meaning "including but not limited to". The term "based on" is to be interpreted as "at least partially based on". The terms "one embodiment" and "an embodiment" are to be interpreted as "at least one embodiment". The term "another embodiment" is to be interpreted as "at least one other embodiment". The terms "upper", "lower", "left", "right", "front", "rear", "top", "bottom", "inner", "outer", "vertical", "horizontal", "lateral", "longitudinal", etc., indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings. These terms are primarily for the purpose of better describing the invention and its embodiments and are not intended to limit the indicated devices, elements, or components to having a specific orientation or to be constructed and operated in a specific orientation. Furthermore, some of the above terms may be used to indicate other meanings besides orientations or positional relationships; for example, the term "upper" may in some cases indicate a dependency or connection relationship. Those skilled in the art can understand the specific meaning of these terms in this invention according to the specific circumstances. In addition, the terms "installed", "set", "equipped with", "connected", and "linked" should be interpreted broadly. For example, it can be a fixed connection, a detachable connection, or an integral structure; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, or an internal connection between two devices, elements, or components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances. Furthermore, the terms "first," "second," etc., are mainly used to distinguish different devices, elements, or components (the specific types and structures may be the same or different), and are not used to indicate or imply the relative importance or quantity of the indicated devices, elements, or components. Unless otherwise stated, "a plurality of" means two or more.

[0034] When inspecting the tolerances of shell components using rigid gauges, the center distance of the shell components to be inspected may be too small relative to the rigid gauge. This prevents the gauge from adaptively adjusting its position relative to the inner wall of the shell, causing the gauge to jam after being placed inside. Furthermore, the rigid gauge may even scratch the inner wall of the shell due to sliding friction. Therefore, a shell component inspection device is needed that can adaptively adjust its position relative to the shell's center during tolerance inspection, while preventing jamming or damage to the workpiece during center distance inspection.

[0035] Example 1:

[0036] This embodiment discloses a shell assembly detection device. Please refer to [reference needed]. Figure 1 and Figure 4 The shell component testing device includes:

[0037] The upper detection unit 12 includes an upper cover portion 121, a fixing portion 122, and a plurality of upper limit grooves 123; the fixing portion 122 is disposed on the upper cover portion 121 and has the same central axis as at least a portion of the upper cover portion 121; the fixing portion 122 and the upper cover portion 121 form an upper limit groove 123 along the detection direction; the plurality of upper limit grooves 123 are circumferentially spaced on the periphery of the fixing portion 122 and the upper cover portion 121; wherein the plurality of upper limit grooves 123 are evenly arranged in the circumferential direction;

[0038] The lower detection component 20 includes a lower cover portion 21 and a lower limiting groove 22; the lower cover portion 21 is detachably connected to the upper cover portion 121; a plurality of lower limiting grooves 22 are spaced apart circumferentially on the lower cover portion 21; the lower limiting grooves 22 are arranged opposite to and connected to the upper limiting grooves 123 along the detection direction to form a receiving groove; by setting the lower cover portion 21 and the upper cover portion 121 to be detachably connected, it is convenient to install the rolling component 30 while separating the upper cover portion 121 from the lower cover portion 21, providing sufficient space for the rolling component 30 to roll while facilitating maintenance and cleaning, and preventing the shell component detection device from getting stuck during detection.

[0039] The rolling component 30 is located in the receiving groove, allowing the rolling component 30 to roll within the receiving groove and simultaneously forming multiple points of support in the circumferential direction, enabling the shell component detection device to automatically center within the detection groove 42 and achieve the function of adaptive shell centering.

[0040] In the first state of the shell assembly detection device, the shell assembly detection device is located in the detection groove 42 of the shell unit 41, and the rolling component 30 rolls and engages with the inner peripheral wall of the shell unit 41 in the detection groove 42 along the detection direction; wherein, the shell assembly 40 includes the shell unit 41 and the detection groove 42 located in the shell unit 41.

[0041] For details, please refer to Figure 1 , Figure 6 and Figure 7 The first state refers to the state in which the shell assembly detection device detects the center distance of the shell unit 41. The detection groove 42 includes a central groove 421 and a sliding groove 422 that are interconnected. The sliding groove 422 is located circumferentially on the inner circumferential side of the central groove 421 and corresponds to the receiving groove. The fixing part 122 can be located in the central groove 421. The sliding groove 422 is positioned opposite to the rolling assembly 30 and the two have the same shape, which makes it easy for the shell assembly detection device to adapt to the center distance of the shell assembly 40.

[0042] Understandably, the rolling assembly 30 is located within the receiving groove, which is a cavity formed by multiple upper limit grooves 123 and lower limit grooves 22 spaced circumferentially and connected along the detection direction. The receiving groove is circumferentially distributed within the shell assembly detection device. Ensuring the rolling assembly 30 is evenly distributed circumferentially ensures balanced force distribution when the shell assembly detection device enters the detection groove 42. In the first state, the rolling fit between the rolling assembly 30 and the inner peripheral wall of the shell unit 41 replaces the sliding fit, converting sliding friction during the detection process into rolling friction. This avoids rigid jamming caused by center distance tolerance fluctuations in the shell assembly detection device, while also preventing scratches on the inner peripheral wall of the shell unit 41, thus enabling rapid determination of the center distance of the shell assembly 40. Furthermore, the fixing part 122 includes a central body 1221 and a plurality of limiting bodies 1222; the central body 1221 is connected to the upper cover part 121 along the detection direction; the plurality of limiting bodies 1222 are spaced apart circumferentially on the periphery of the central body 1221; adjacent limiting bodies 1222 enclose to form a partial upper limit groove 123; wherein, the side of the central body 1221 facing the limiting body 1222 is radially interference-fitted with the limiting body 1222.

[0043] For details, please refer to Figure 2 and Figure 5The spacing of multiple limiting bodies 1222 determines the position of multiple upper limit grooves 123, thereby determining the position of the rolling assembly 30 and facilitating the installation of the rolling assembly 30. The center body 1221 and the limiting bodies 1222 are interference-fitted, so that there is no relative radial displacement between the limiting bodies 1222 and the center body 1221. This ensures that the line connecting two opposing rolling assemblies 30 passes through the center of the center body 1221. The distance between two opposing symmetrical rolling assemblies 30 passing through the central axis of the center body 1221 is the longest. For measuring the center distance inside the housing unit 41, the line connecting through the central axis is the diameter of the center distance. That is, the housing center distance is the diameter 2d of the two opposing rolling assemblies 30 plus the diameter D of the center body 1221. If the line does not pass through the central axis, it cannot be used to measure the center distance. Meanwhile, based on the interference fit of the limiting body 1222, the limiting body 1222 is stable in position when subjected to repeated radial impacts from the rolling component 30, which improves the centering repeatability accuracy of the detection device during long-term use and avoids the problem that the center distance cannot be accurately measured because the connection does not pass through the central axis.

[0044] Furthermore, the upper limit groove 123 includes a first groove 1231 and a second groove 1232 that are connected along the detection direction; the first groove 1231 is disposed on the upper cover portion 121; the second groove 1232 is disposed between adjacent limiting bodies 1222; the first groove 1231 and the second groove 1232 at least partially overlap along the detection direction; the first groove 1231, the second groove 1232 and the lower limit groove 22 are connected sequentially along the detection direction.

[0045] Specifically, the first groove 1231, the second groove 1232, and the lower limiting groove 22 are connected along the detection direction to form a smooth receiving groove, ensuring that the rolling component 30 can float axially and roll stably in the circumferential direction within the receiving groove. This allows the rolling component 30 to be simultaneously limited by the upper cover 121 in the axial and radial directions and by the limiting body 1222 in the circumferential direction, thereby solving the problem of jamming and damage to the workpiece during the detection of the shell component.

[0046] Further, please refer to Figure 2 and Figure 3The maximum depth of the first groove 1231 along the detection direction is greater than the maximum depth of the lower limit groove 22 along the detection direction. As can be seen from the above, the rolling component 30 is in contact with both the first groove 1231 and the lower limit groove 22. Due to gravity, the rolling component 30 is located in the lower limit groove 22. At the same time, the shallower lower limit groove 22 can guide the rolling component 30 to preferentially abut against the lower cover part 21, which facilitates the shell component detection device to quickly position itself when detecting the center distance inside the shell unit 41. In the first state, the friction between the rolling component 30 and the inner wall of the shell unit 41 will cause the rolling component 30 to slide towards the first groove 1231. The deeper first groove 1231 provides sufficient axial floating space for the rolling component 30, while preventing the rolling component 30 from falling out of the receiving groove when it floats up due to the inner wall compression.

[0047] Furthermore, the line connecting the two rolling components 30, which are positioned opposite each other along the central axis of the central body 1221, passes through the central axis of the central body 1221. This results in the two rolling components 30 being arranged symmetrically about the central axis. In the first state, the symmetrically arranged rolling components 30 simultaneously contact the inner peripheral wall of the shell unit 41, balancing the radial support forces on the shell component detection device and preventing the shell component detection device from tilting within the detection groove 42, thereby ensuring the consistency of the detection device's centering.

[0048] Meanwhile, in the line connecting any two rolling components 30, the line connecting two symmetrically arranged rolling components 30 usually passes through the center of the central body 1221. The distance passing through the central axis of the central body 1221 is the longest and is also the center distance of the housing. Therefore, symmetrical arrangement of the rolling components 30 improves the accuracy of the housing component detection device. The length of the line connecting components that do not pass through the center cannot be used to prove the accuracy of the housing center distance. Furthermore, the rolling component 30 and the limiting body 1222 have a first gap in the circumferential direction; the rolling component 30 and the central body 1221 have a second gap in the radial direction; the second gap is greater than the first gap.

[0049] For details, please refer to Figure 3 and Figure 7 By limiting the rolling component 30 and the limiting body 1222 to have a first gap in the circumferential direction, the rolling component 30 is guaranteed to have a fine adjustment margin in the circumferential direction, preventing the rolling component 30 from deflecting and getting stuck. By limiting the rolling component 30 to have a second gap in the radial direction with the center body 1221, and the second gap being larger than the first gap, the radial floating degree of freedom of the rolling component 30 is greater than the circumferential floating degree of freedom. When the center distance of the shell unit 41 fluctuates within the acceptable tolerance range, the rolling component 30 performs adaptive compensation in the radial direction, thereby maintaining relatively accurate guidance in the circumferential direction. This accommodates tolerance fluctuations while preventing the rolling component 30 from moving erratically, improving the accuracy of the shell component detection device.

[0050] Furthermore, the rolling assembly 30 has a gap along the axial direction with the upper cover portion 121 and / or the lower cover portion 21; in the second state of the shell assembly detection device, the rolling assembly 30 abuts against the lower cover portion 21 along the axial direction and maintains a gap with the upper cover portion 121; in the first state, the rolling assembly 30 is driven to move in the direction close to the lower cover portion 21, and the rolling assembly 30 and the lower cover portion 21 gradually separate from the abutment and move in the direction close to the upper cover portion 121.

[0051] Specifically, by having a gap along the axial direction between the rolling assembly 30 and the upper cover portion 121 and the lower cover portion 21, the rolling assembly 30 has axial movement capability within the receiving groove; or by having a gap along the axial direction between the rolling assembly 30 and the upper cover portion 121 or the lower cover portion 21, the rolling assembly 30 has the ability to move away from or towards the interior of the shell unit 41 within the receiving groove. The second state refers to the stationary placement state when the shell assembly detection device is not detecting it.

[0052] This is understandable, please refer to it. Figure 1 , Figure 4 and Figure 7 In the second state, the rolling assembly 30 abuts against the lower cover portion 21 along the axial direction and maintains a gap with the upper cover portion 121, forming a stable placement posture. In the first state, the rolling assembly 30 is driven to move away from the lower cover portion 21, so that it gradually separates from the lower cover portion 21 and moves towards the upper cover portion 121, realizing the switching of the rolling assembly 30 from static positioning to dynamic floating during the detection process. This eliminates the axial rigid constraint of the upper and lower covers on the rolling assembly 30, allowing the rolling assembly 30 to roll completely in accordance with the trajectory of the inner peripheral wall of the shell unit 41, further improving the detection smoothness of the shell assembly detection device and reducing wear on the workpiece.

[0053] Specifically, the first state also includes driving the rolling assembly 30 to move away from the lower cover portion 21, and the rolling assembly 30 and the lower cover portion 21 moving from separation towards the upper cover portion 121 until the rolling assembly 30 and the upper cover portion 121 come into contact. When the rolling assembly 30 comes into contact with the upper cover portion 121, and the friction between the shell unit 41 and the rolling assembly 30 is zero, the shell assembly detection device enters the second state.

[0054] Furthermore, the thickness of the upper cover portion 121 along the axial direction is greater than the thickness of the lower cover portion 21 along the axial direction, so that the upper cover portion 121 has higher structural rigidity and can withstand the push and pull forces applied to the shell assembly detection device from the outside.

[0055] Furthermore, the connecting unit 11 is connected to the side of the upper cover portion 121 away from the fixing portion 122 along the detection direction. The connecting unit 11 and the upper detection unit 12 are combined to form the upper detection assembly 10. The connecting unit 11 is connected to the upper detection unit 12 on the side of the upper detection unit 12 away from the lower cover. The connecting unit 11 serves as a mounting base for the handle or drive unit, and its position is located at the top of the upper cover portion 121, avoiding the interior of the detection groove 42, so as to facilitate operation or provide driving force.

[0056] Understandably, operators or automated equipment can apply a push or pull force along the detection direction to the shell component detection device through the connection unit 11, which facilitates the insertion, movement and removal of the shell component detection device.

[0057] Example 2:

[0058] This embodiment discloses a method for detecting shell components. Please refer to [link / reference]. Figure 5 and Figure 6 The shell component detection method includes steps S10-S30:

[0059] Step S10: Based on the detection command, the shell component detection device is placed in the detection slot 42 of the shell unit 41; the shell component detection device needs to be placed inside the shell unit 41 in order to measure the tolerance of the shell unit 41.

[0060] Step S20: Based on the shell component detection device being located in the detection groove 42, the shell component detection device is driven to move along the detection direction, and the rolling component 30 rolls in cooperation with the inner peripheral wall of the shell unit 41 within the detection groove 42.

[0061] Specifically, in step S20, when the shell assembly detection device measures the center distance inside the shell unit 41, the rolling assembly 30 needs to be engaged with the inner wall of the shell unit 41 in order to further measure the center distance of the shell unit 41.

[0062] Step S30: Based on the rolling engagement between the rolling assembly 30 and the inner peripheral wall of the shell unit 41, the center distance of the shell unit 41 is obtained. After the rolling assembly 30 engages with the inner shell unit 41, the center distance of the shell can be measured by adding the diameter of the two symmetrical rolling assemblies 30 to the diameter of the central body 1221.

[0063] Those skilled in the art will understand that the above embodiments are specific examples of implementing the present invention, and in practical applications, various changes can be made in form and detail without departing from the scope of the present invention.

Claims

1. A shell assembly detection device, configured to detect shell assemblies, characterized in that, include: The upper detection unit includes an upper cover, a fixing part, and a plurality of upper limit slots; the fixing part is disposed on the upper cover and has the same central axis as at least a portion of the upper cover; the fixing part and the upper cover form the upper limit slots along the detection direction; the plurality of upper limit slots are circumferentially spaced on the periphery of the fixing part and the upper cover; The lower detection component includes a lower cover and a lower limiting groove; the lower cover is detachably connected to the upper cover; a plurality of lower limiting grooves are spaced apart circumferentially on the lower cover; the lower limiting grooves are arranged opposite to and communicate with the upper limiting groove along the detection direction to form a receiving groove; The rolling component is located within the receiving groove; In the first state of the shell assembly detection device, the shell assembly detection device is located in the detection groove of the shell unit, and the rolling assembly rolls in the detection groove along the detection direction with the inner peripheral wall of the shell unit; wherein, the shell assembly includes the shell unit and the detection groove located in the shell unit.

2. The shell assembly detection device according to claim 1, characterized in that, The fixing part includes a central body and a plurality of limiting bodies; the central body is connected to the upper cover part along the detection direction; the plurality of limiting bodies are spaced apart circumferentially on the periphery of the central body; adjacent limiting bodies enclose and form part of the upper limit groove; wherein, the side of the central body facing the limiting body is radially interference-fitted with the limiting body.

3. The shell assembly detection device according to claim 2, characterized in that, The upper limit groove includes a first groove and a second groove that are connected along the detection direction; the first groove is disposed on the upper cover; the second groove is disposed between adjacent limiting bodies; the first groove and the second groove at least partially overlap along the detection direction; the first groove, the second groove and the lower limit groove are connected sequentially along the detection direction.

4. The shell assembly detection device according to claim 3, characterized in that, The maximum depth of the first groove along the detection direction is greater than the maximum depth of the lower limit groove along the detection direction.

5. The shell assembly detection device according to claim 2, characterized in that, The line connecting the two rolling components, which are arranged opposite each other along the central axis of the central body, passes through the central axis of the central body.

6. A shell assembly detection device according to any one of claims 2-4, characterized in that, The rolling assembly and the limiting body have a first gap in the circumferential direction; the rolling assembly and the central body have a second gap in the radial direction; the second gap is larger than the first gap.

7. The shell assembly detection device according to claim 6, characterized in that, The rolling assembly has a gap with the upper cover portion and / or the lower cover portion along the axial direction; in the second state of the shell assembly detection device, the rolling assembly abuts against the lower cover portion along the axial direction and maintains a gap with the upper cover portion; in the first state, the rolling assembly is driven to move in a direction close to the lower cover portion, and the rolling assembly gradually separates from the lower cover portion and moves in a direction close to the upper cover portion.

8. The shell assembly detection device according to claim 1, characterized in that, The thickness of the upper cover portion along the axial direction is greater than the thickness of the lower cover portion along the axial direction.

9. The shell assembly detection device according to claim 1, characterized in that, The shell assembly detection device further includes: The connecting unit is connected along the detection direction to the side of the upper cover portion away from the fixing portion.

10. A method for detecting shell components, characterized in that, An apparatus for detecting a shell assembly according to any one of claims 1-9, wherein the shell assembly detection method comprises: Started based on the detection command, the shell component detection device is placed in the detection slot of the shell unit; Based on the fact that the shell component detection device is located in the detection groove, the shell component detection device is driven to move along the detection direction, and the rolling component rolls in cooperation with the inner peripheral wall of the shell unit in the detection groove; The center distance of the shell unit is obtained based on the rolling engagement between the rolling component and the inner peripheral wall of the shell unit.

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