Automobile air conditioner sucker segment difference detection device and test method

Abstract

The invention discloses an automobile air conditioner sucker segment difference detection device and a test method, and belongs to the technical field of automobile part detection. Comprising a pressing head, a standard module, a supporting base and an electromagnet, a product positioning jig capable of floating in the vertical direction is arranged on the supporting base, and the product positioning jig can be positioned and attached to the reference A face of the suction cup component; the pressing head can press the suction cup component downwards so that the reference face B on the suction cup component can be attached to the magnetic suction reference face on the electromagnet, and the reference face A and the reference face B on the suction cup component arranged on the product positioning jig are perpendicular to the floating direction of the product positioning jig. And a displacement sensor capable of monitoring the displacement distance of the product positioning jig is arranged on the supporting base. According to the automobile air conditioner suction cup segment difference detection device and the test method, the problems that existing suction cup segment difference detection is low in efficiency and precision, and the repeated labor intensity of operators is large are solved.

Description

Technical Field

[0001] The present invention belongs to the technical field of automotive parts detection, and particularly relates to an automotive air-conditioning suction cup step difference detection device and a testing method. Background Art

[0002] With the rapid development of automobiles, the demand for automotive air-conditioning compressor clutches has increased steadily. As one of the most critical components of the clutch, the quality of the suction cup determines the output performance of the entire clutch. Among them, the step difference parameter of the suction cup is one of the most core indicators, so the quality control of the suction cup finished product is very important.

[0003] The existing suction cup step difference detection mainly adopts the sampling inspection method, which is mainly manually completed by operators on a three-dimensional coordinate measuring instrument. The operator first calibrates the measuring head, and then places the suction cup product on the detection fixture. The operator manually measures the specified detection reference positions of the suction cup in turn, and then obtains the step difference result. The entire detection process is very complicated, the repetitive labor intensity of the operator is high, the detection accuracy is relatively low due to human factors, and the detection efficiency is relatively low, which is difficult to meet the operation requirements of high-efficiency production. Summary of the Invention

[0004] The purpose of the present invention is to overcome the deficiencies in the prior art, and provide an automotive air-conditioning suction cup step difference detection device and a testing method, which solve the problems of low detection efficiency, low accuracy, and high repetitive labor intensity of the existing suction cup step difference detection.

[0005] To achieve the above object, the technical solution adopted by the present invention is: an automotive air-conditioning suction cup step difference detection device, including a pressing head, a standard module, a support base, and an electromagnet; A product positioning fixture capable of floating in the vertical direction is arranged on the support base, and the product positioning fixture can position and fit on the reference A surface of the suction cup component; the pressing head can press down the suction cup component to make the reference B surface on the suction cup component fit on the magnetic attraction reference surface on the electromagnet; Among them, for the suction cup component placed on the product positioning fixture, the reference A surface and the reference B surface thereon are perpendicular to the floating direction of the product positioning fixture, and a displacement sensor capable of monitoring the displacement distance of the product positioning fixture is arranged on the support base.

[0006] Optionally, it further includes a driving mechanism for driving the linear movement of the pressing head; The driving mechanism includes two first guide shafts that are parallel to each other and one end of each is connected to the support mounting plate. Both of the first guide shafts are movably penetrated through the movable plate, and the pressing head is connected to the movable plate. A driving cylinder capable of driving the movable plate to move along the first guide shaft is arranged on the support mounting plate.

[0007] Optionally, the indenter includes a fixed seat, a quick-lock seat disposed on the fixed seat, and a fixing plate floatingly disposed on the quick-lock seat; Wherein, a plurality of equal-height screws that can movably penetrate through the quick-lock seat are threadedly connected to the fixing plate, and a buffer spring that can elastically support the quick-lock seat and the fixing plate is sleeved on the outer periphery of the equal-height screws.

[0008] Optionally, a protective plate is disposed on one side of the fixing plate facing the product positioning fixture.

[0009] Optionally, the support base includes an upper mounting table and a lower mounting table; Wherein, the lower mounting table includes a support frame detachably connected to the upper mounting table, a guide sleeve disposed on the support frame, and a magnet mounting seat disposed at the top of the guide sleeve. A plurality of the electromagnets can be embedded in the magnet mounting seat, and a second guide shaft is slidably connected in the inner cavity of the guide sleeve. A nail-shaped limit post that can be connected to the bottom of the second guide shaft is movably penetrated through the support frame. The column head of the nail-shaped limit post can abut against the bottom side of the support frame, and a return spring that can support the second guide shaft and the support frame is sleeved on the outer periphery of the nail-shaped limit post; And the product positioning fixture is detachably connected to the top end of the second guide shaft.

[0010] Optionally, a limit groove is axially disposed on the outer wall of the second guide shaft, and a limit bolt that can be slidably embedded in the limit groove is threadedly connected to the guide sleeve.

[0011] Optionally, the upper mounting table includes a mounting bottom plate and an adjustment bottom plate that can be attached to the mounting bottom plate, and a plurality of fixing blocks that can press down on the adjustment bottom plate are detachably connected to the mounting bottom plate through mounting bolts.

[0012] Optionally, the middle parts of the mounting bottom plate and the adjustment bottom plate are hollowed out for embedding the support frame, and the support frame can be lapped on the top side of the adjustment bottom plate. A plurality of positioning copper posts are disposed on the adjustment bottom plate, and positioning copper sleeves inserted and matched with the positioning copper posts are disposed on the support frame.

[0013] Optionally, the electromagnets are distributed in a circumferential array around the product positioning fixture.

[0014] A method for the side view of the step difference of an automotive air-conditioning suction cup, including using the automotive air-conditioning suction cup step difference detection device described in any one of the foregoing items, and the method includes the following steps; Step 1: Calibrate and determine the initial position of the product positioning fixture, the initial data of the displacement sensor, and the uniqueness of the magnetic adsorption reference surface. Place the standard module on the product positioning fixture, and then press down the standard module through the pressing head until the reference B surface on the standard module is preliminarily attached to the magnetic adsorption reference surface. Subsequently, turn on the power supply of the electromagnet to make the reference B surface on the standard module closely attached to the magnetic adsorption reference surface. Then, detect and record the standard data of the product positioning fixture at this position through the displacement sensor. Step 2: After the standard data is recorded, the pressing head is removed from the standard module. After the product positioning fixture is reset to the initial position, the standard module is removed. Step 3: Test the suction cup component to be tested according to the operation steps of the standard module in Step 1 to obtain the actual data through the displacement sensor. The difference between the standard data and the actual data is the segment difference error of the suction cup component.

[0015] Compared with the prior art, the beneficial effects achieved by the present invention are as follows: (1) By the uniqueness of the positioning between the magnetic adsorption reference surface and the product positioning fixture, the contact deviation is eliminated; and the segment difference error of the suction cup component is reflected by the displacement difference of the displacement sensor, that is, the systematic error can be excluded through the comparison measurement between the standard module and the suction cup component to be tested, which not only improves the test efficiency, but also ensures the repeatability and accuracy of the segment difference test. (2) The operation is simple and the degree of automation is high, which is suitable for batch online detection on the assembly line, effectively reducing the intensity of the repetitive labor of the operators and improving the detection efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The present invention will be further described below in conjunction with the drawings and embodiments.

[0017] Figure 1 It is a schematic structural diagram of the automotive air-conditioning suction cup segment difference detection device and test method in the preferred embodiment of the present invention; Figure 2 It is a schematic structural diagram of the pressing head and the driving mechanism in the preferred embodiment of the present invention; Figure 3 It is a schematic structural diagram of the upper mounting table in the preferred embodiment of the present invention; Figure 4 It is a schematic structural diagram of the lower mounting table in the preferred embodiment of the present invention; Figure 5 It is a schematic side view structural diagram of the lower mounting table in the preferred embodiment of the present invention; Figure 6 It is in the preferred embodiment of the present invention Figure 5 The cross-sectional structural diagram at A-A; Figure 7It is a schematic cross-sectional structure diagram of the suction cup component in the preferred embodiment of the present invention; Among them, 1. Pressure head; 101. Fixed seat; 102. Quick-lock seat; 103. Fixed plate; 104. Equal-height screw; 105. Buffer spring; 106. Protection plate; 2. Electromagnet; 201. Magnetic absorption reference surface; 3. Suction cup component; 301. Reference B surface; 302. Reference A surface; 4. Product positioning jig; 5. Displacement sensor; 6. Support mounting plate; 7. First guide shaft; 8. Movable plate; 9. Driving cylinder; 10. Support frame; 11. Guide sleeve; 12. Magnet mounting seat; 13. Second guide shaft; 1301. Limit groove; 14. Nail-shaped limit post; 1401. Column head; 15. Return spring; 16. Limit bolt; 17. Mounting base plate; 18. Adjusting base plate; 19. Fixed pressing block; 20. Positioning copper column; 21. Positioning copper sleeve. Detailed implementation mode

[0018] Now, the present invention will be further described in detail with reference to the accompanying drawings and embodiments. These drawings are all simplified schematic diagrams, only showing the basic structure of the present invention in a schematic manner, so they only show the components related to the present invention.

[0019] It should be noted that if there are directional indications (such as up, down, bottom, top, etc.) involved in this embodiment, then the directional indications are only used to explain the relative position relationship and movement conditions between components in a specific posture. If the specific posture changes, the directional indications will also change accordingly. The terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the quantity of the indicated technical features. Thus, features defined with "first" and "second" may explicitly or implicitly include one or more of such features. Unless otherwise clearly specified and limited, the terms "set", "connected", and "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be directly connected, or indirectly connected through an intermediate medium, and it can be the internal communication of two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific situations. Embodiment 1

[0020] As Figures 1-7As shown, an automobile air-conditioning suction cup step difference detection device includes a pressure head 1, a standard module, a support base, and an electromagnet 2. A product positioning fixture 4 that can float in the vertical direction is provided on the support base, and the product positioning fixture 4 can position and fit onto the reference A surface 302 of the suction cup component 3. The pressure head 1 can press down on the suction cup component 3 to make the reference B surface 301 on the suction cup component 3 fit onto the magnetic attraction reference surface 201 on the electromagnet 2. The specific structure of the suction cup component 3 can refer to a suction cup component on an automobile air-conditioning compressor with the publication number 20204692483, and the reference A surface 302 and the reference B surface 301 on the suction cup component 3 are as Figure 7 shown. The reference A surface 302 and the reference B surface 301 are parallel to each other. At the same time, the vertical distance between the reference A surface 302 and the reference B surface 301 is the step difference. The step difference of the suction cup component 3 needs to be within the error range allowed by the preset standard step difference value, and the product positioning fixture 4 can maintain its position unchanged both without external force and when the suction cup component 3 is placed on the product positioning fixture 4, that is, the initial position of the product positioning fixture 4 is fixed.

[0021] It should be noted that for the suction cup component 3 placed on the product positioning fixture 4, the reference A surface 302 and the reference B surface 301 thereon are perpendicular to the floating direction of the product positioning fixture 4. And a displacement sensor 5 capable of monitoring the displacement distance of the product positioning fixture 4 is provided on the support base. The displacement sensor 5 can detect and record the initial data when the product positioning fixture 4 is in the initial position, and the initial data of the displacement sensor 5 needs to be maintained at any fixed value during the segment difference test of the same batch. Preferably, in the embodiment, for the suction cup component 3 placed on the product positioning fixture 4, the reference A surface 302 and the reference B surface 301 thereon are perpendicularly arranged with respect to the floating direction of the product positioning fixture 4. When the press head 1 presses down the suction cup component 3 by a certain distance, the product positioning fixture 4 can also move along the vertical direction accordingly. During this process, when the reference B surface 301 on the suction cup component 3 moves to be preliminarily in contact with the magnetic adsorption reference surface 201 on the electromagnet 2, the press head 1 will immediately stop the pressing action. Subsequently, the electromagnet 2 is powered on, so that the reference B surface 301 on the suction cup component 3 will be tightly in contact with the magnetic adsorption reference surface 201 on the electromagnet 2, and the displacement sensor 5 can detect and record the actual data of the product positioning fixture 4 at this position. Among them, through the uniqueness of the positioning between the magnetic adsorption reference surface 201 and the product positioning fixture 4, the contact deviation is eliminated. And before the actual test, a standard module (not shown in the figure) will be tested through the above-mentioned implementation method. The standard module is a standard experimental mold simulating the suction cup component 3, and the reference A surface 302 and the reference B surface 301 corresponding to the suction cup component 3 are also provided thereon. And since the vertical distance between the reference A surface 302 and the reference B surface 301 on the standard module is the standard segment difference value, by performing the above-mentioned test operation on the standard module, standard data corresponding to the actual data can be obtained. The comparative measurement between the standard module and the suction cup component 3 to be tested can effectively eliminate the systematic error, and the difference between the standard data and the actual data is the segment difference error of the suction cup component 3, and the sum of the standard segment difference value and the segment difference error is the segment difference of the suction cup component 3. The detection device in this technical solution can detect the segment difference error of the suction cup component 3 compared with the traditional detection means, and the segment difference error can be used as a condition for judging whether the suction cup component 3 is qualified.

[0022] It should be noted that there may be assembly errors when the detection device is actually assembled. Therefore, in actual applications, the influence of the assembly error on the actual data and the standard data needs to be considered. Therefore, a difference compensation needs to be added to the actual data and the standard data to ensure the authenticity of the segment difference error test result.

[0023] Compared with the traditional implementation operation for testing the segment difference of the suction cup component 3, this device has simple operation and high automation degree, and is suitable for batch online detection on the assembly line. It can not only reduce the intensity of the repetitive labor of the operators and improve the detection efficiency, but also improve the accuracy of the test data.

[0024] Further, in this embodiment, the suction cup component 3 includes components such as a suction cup, an inner ring, an outer ring, rivets, and a hub, and the suction cup is connected to the hub through rubber packing, an inner ring, an outer ring, and rivets. It should be noted that the components on the suction cup component 3 are less affected by the electromagnet 2, and the influence on the test data can be ignored. Embodiment 2

[0025] As described above, the automotive air conditioner suction cup step difference detection device further includes a driving mechanism for driving the indenter 1 to move linearly. The driving mechanism includes two first guide shafts 7 that are parallel to each other and one end of each is connected to the support mounting plate 6. Both of the two first guide shafts 7 are movably inserted through the movable plate 8, and the indenter 1 is connected to the movable plate 8. The movable plate 8 slides along the first guide shafts 7. A precise fit between the movable plate 8 and the first guide shafts 7 can be achieved through linear bearings in the prior art, so as to ensure the moving accuracy of the indenter 1 while restricting the moving direction of the indenter 1. At the same time, in this technical solution, a driving cylinder 9 capable of driving the movable plate 8 to move along the first guide shafts 7 is provided on the support mounting plate 6 to drive the indenter 1 to move linearly, and the driving stroke of the driving cylinder 9 can be controlled and adjusted through various technical means in the prior art to meet the usage requirements.

[0026] It should be noted that in this technical solution, the floating direction of the product positioning fixture 4 is parallel (coincident) with the moving direction of the indenter 1, and the direction indicated by the above-mentioned vertical direction includes but is not limited to any direction in the space rectangular coordinate system.

[0027] Further, in this technical solution, the indenter 1 includes a fixed seat 101 and a quick-lock seat 102 provided on the fixed seat 101. The fixed seat 101 can be connected to the movable plate 8 through fasteners such as bolts in the prior art, and the fixed seat 101 and the quick-lock seat 102 can be detachably connected through various connection methods such as snap connection, plug connection, and buckle connection in the prior art for easy replacement.

[0028] At the same time, as Figure 2 shown, a fixing plate 103 that is floatingly arranged on the quick-lock seat 102 is threadedly connected with a plurality of equal-height screws 104 that can movably penetrate through the quick-lock seat 102. A buffer spring 105 that can elastically support the quick-lock seat 102 and the fixing plate 103 is sleeved on the outer periphery of the equal-height screws 104, so as to prevent damage to the suction cup component 3 caused by rigid contact between the suction cup component 3 and the indenter 1.

[0029] As described above, as Figure 2 shown, a protective plate 106 is provided on one side of the fixing plate 103 facing the product positioning fixture 4. The protective plate 106 can be made of POM material in the prior art to prevent the surface of the suction cup component 3 from being scratched during the process of pressing the suction cup component 3. Embodiment III

[0030] As Figures 3-6 shown, in this technical solution, the support base includes an upper mounting table and a lower mounting table. Among them, the lower mounting table includes a support frame 10 detachably connected to the upper mounting table, a guide sleeve 11 arranged on the support frame 10, and a magnet mounting seat 12 arranged on the top of the guide sleeve 11. A plurality of electromagnets 2 can be embedded in the magnet mounting seat 12, and the electromagnets 2 are distributed in a circumferential array around the product positioning jig 4, so that the suction cup component 3 can be evenly stressed after the electromagnets 2 are energized, fully simulating the situation when the clutch magnetically adsorbs the suction cup component 3, and ensuring the validity of the data. And a second guide shaft 13 is slidably connected in the inner cavity of the guide sleeve 11, and the second guide shaft 13 is in precise fit with the guide sleeve 11, that is, when the second guide shaft 13 slides along the inner cavity of the guide sleeve 11, it has a high linear motion accuracy. At the same time, a nail-shaped limit post 14 that can be connected to the bottom of the second guide shaft 13 is movably passed through the support frame 10. The column head 1401 on the nail-shaped limit post 14 can abut against the bottom side of the support frame 10, and a return spring 15 that can support the second guide shaft 13 and the support frame 10 is sleeved on the outer periphery of the nail-shaped limit post 14. The product positioning jig 4 is detachably connected to the top end of the second guide shaft 13, and the product positioning jig 4 can penetrate through the middle of the magnet mounting seat 12. That is, in the process of the pressing head 1 pressing the suction cup product until it fits with the magnetic adsorption reference surface 201 on the electromagnet 2, the second guide shaft 13 and the nail-shaped limit post 14 will also move synchronously, and the return spring 15 will be compressed. When the pressing head 1 is removed from the suction cup product, the second guide shaft 13 will perform a reset action under the support of the return spring 15 until the column head 1401 on the nail-shaped limit post 14 abuts against the support frame 10 to limit the maximum stroke of the second guide shaft 13 for the reset action and ensure that the initial position of the product positioning jig 4 remains unchanged when testing the same batch of suction cup components 3.

[0031] In this technical solution, as Figure 5 shown, the displacement sensor 5 can obtain the segment difference error of the suction cup component 3 by monitoring the displacement distance of the nail-shaped limit post 14, and can obtain the true segment difference of the suction cup component 3 therefrom.

[0032] In this embodiment, a limit groove 1301 is axially arranged on the outer wall of the second guide shaft 13, and a limit bolt 16 that can be slidably embedded in the limit groove 1301 is threadedly connected to the guide sleeve 11, that is, one end of the limit bolt 16 can be embedded in the limit groove 1301 to prevent the second guide shaft 13 from rotating.

[0033] The upper mounting table includes a mounting base plate 17 and an adjustment base plate 18 that can be attached to the mounting base plate 17. A plurality of fixing pressure blocks 19 that can press down on the adjustment base plate 18 are detachably connected to the mounting base plate 17 through mounting bolts, facilitating the disassembly and installation of the adjustment base plate 18. Meanwhile, the middle parts of the mounting base plate 17 and the adjustment base plate 18 are hollowed out for embedding the support frame 10. The support frame 10 can be lapped on the top side of the adjustment base plate 18. A plurality of positioning copper posts 20 are provided on the adjustment base plate 18, and a number of positioning copper sleeves 21 are provided on the support frame 10. The positioning copper posts 20 and the positioning copper sleeves 21 are matched to achieve precise positioning and avoid position adjustment after installation. Embodiment 4

[0034] Based on Embodiment 1, this embodiment provides a method for testing the step difference of an automotive air-conditioning suction cup. This method is based on the situation that "on the suction cup component 3 placed on the product positioning fixture 4, the reference A surface 302 and the reference B surface 301 thereon are perpendicular to the floating direction of the product positioning fixture 4". The method is as follows: Step 1, correct and determine the initial position of the product positioning fixture 4, the initial data of the displacement sensor 5, and the uniqueness of the magnetic adsorption reference surface 201. Place the standard module on the product positioning fixture 4, and then press down the standard module through the pressing head 1 until the reference B surface 301 on the standard module is preliminarily attached to the magnetic adsorption reference surface 201. Subsequently, turn on the power supply of the electromagnet 2 to make the reference B surface 301 on the standard module closely attached to the magnetic adsorption reference surface 201. Then, detect and record the standard data of the product positioning fixture 4 at this position through the displacement sensor 5. Step 2, after the standard data is recorded, the pressing head 1 is removed from the standard module. After the product positioning fixture 4 is reset to the initial position, the standard module is removed. Step 3, test the suction cup component 3 to be tested according to the operation steps of the standard module in Step 1 and Step 2 to obtain the actual data through the displacement sensor 5. The difference between the standard data and the actual data is the step difference error of the suction cup component 3.

[0035] As described above, after completing Step 1 and Step 2 once, the operation of Step 3 can be repeated.

[0036] Working principle: The initial position of the product positioning fixture 4, the initial data of the displacement sensor 5, and the position of the magnetic absorption reference surface 201 remain unchanged. The suction cup component 3 placed on the product positioning fixture 4 has its reference A surface 302 and reference B surface 301 perpendicular to the floating direction of the product positioning fixture 4. The position when the reference B surface 301 is in contact with the magnetic absorption reference surface 201 is constant. Only the reference A surface 302 with the product positioning fixture 4 as the positioning reference is a variable. The standard data obtained through the simulation test of the standard module is used as the reference value for the position change of the reference A surface 302 along the vertical direction. Thus, the actual data obtained by the suction cup component 3 during the actual test can be compared with the standard data to obtain the accurate step difference data of the suction cup component 3.

[0037] Based on the ideal embodiments of the present invention as an inspiration, through the above description, relevant personnel can completely make various changes and modifications without departing from the technical idea of this invention. The technical scope of this invention is not limited to the content in the specification, and the technical scope must be determined according to the scope of the claims.

Claims

1. A vehicle air conditioner suction cup step difference detection device, characterized in that: It includes a pressure head (1), a standard module, a support base and an electromagnet (2); The support base is provided with a product positioning fixture (4) capable of floating in a vertical direction, and the product positioning fixture (4) is capable of positioning and fitting to a reference A surface (302) of the suction cup component (3); the pressure head (1) is capable of pressing down the suction cup component (3) so that a reference B surface (301) on the suction cup component (3) fits to a magnetic attraction reference surface (201) on the electromagnet (2); The suction cup component (3) placed on the product positioning fixture (4) has a reference A surface (302) and a reference B surface (301) thereon that are perpendicular to the floating direction of the product positioning fixture (4), and a displacement sensor (5) capable of monitoring the displacement distance of the product positioning fixture (4) is provided on the support base.

2. The automobile air conditioner suction cup step difference detection device according to claim 1, characterized in that: It also includes a driving mechanism for driving the pressure head (1) to move linearly; The driving mechanism comprises two first guide shafts (7) which are parallel to each other and one end of each of which is connected to the supporting mounting plate (6); the two first guide shafts (7) are movably arranged on the movable plate (8); the pressure head (1) is connected to the movable plate (8); and a driving cylinder (9) which is capable of driving the movable plate (8) to move along the first guide shafts (7) is provided on the supporting mounting plate (6).

3. The automobile air conditioner suction cup step difference detection device according to claim 1, characterized in that: The pressing head (1) comprises a fixing seat (101), a quick-locking seat (102) arranged on the fixing seat (101), and a fixing plate (103) floatingly arranged on the quick-locking seat (102); The fixing plate (103) is threadedly connected to a plurality of equal-height screws (104) that can be movably inserted into the quick-lock seat (102), and the outer periphery of the equal-height screws (104) is sleeved with a buffer spring (105) that can elastically support the quick-lock seat (102) and the fixing plate (103).

4. The automobile air conditioner suction cup step difference detection device according to claim 3, characterized in that: A protective plate (106) is provided on the side of the fixing plate (103) facing the product positioning fixture (4).

5. The automobile air conditioner suction cup step difference detection device according to claim 1, characterized in that: The support base includes an upper mounting platform and a lower mounting platform; The lower mounting platform comprises a support frame (10) which can be detachably connected to the upper mounting platform, a guide sleeve (11) arranged on the support frame (10), and a magnet mounting seat (12) arranged on the top of the guide sleeve (11); a plurality of the electromagnets (2) can be embedded in the magnet mounting seat (12); a second guide shaft (13) is slidably connected in the inner cavity of the guide sleeve (11); a nail-shaped limiting column (14) which can be connected to the bottom of the second guide shaft (13) is movably penetrated on the support frame (10); a column head (1401) on the nail-shaped limiting column (14) can abut against the bottom side of the support frame (10); and a return spring (15) which can support the second guide shaft (13) and the support frame (10) is sleeved on the outer periphery of the nail-shaped limiting column (14); Furthermore, the product positioning fixture (4) is detachably connected to the top end of the second guide shaft (13).

6. The automobile air conditioner suction cup step difference detection device according to claim 5, characterized in that: The outer wall of the second guide shaft (13) is provided with a limiting groove (1301) along its axial direction, and the guide sleeve (11) is threadedly connected with a limiting bolt (16) which can be slidably embedded in the limiting groove (1301).

7. The automobile air conditioner suction cup step difference detection device according to claim 5, characterized in that: The upper mounting platform comprises a mounting base plate (17) and an adjustment base plate (18) capable of being attached to the mounting base plate (17), and a plurality of fixed pressing blocks (19) capable of being pressed downward on the adjustment base plate (18) are detachably connected to the mounting base plate (17) via mounting bolts.

8. The automobile air conditioner suction cup step difference detection device according to claim 7, characterized in that: The middle parts of the installation base plate (17) and the adjustment base plate (18) are hollowed out for embedding the support frame (10), and the support frame (10) can overlap the top side of the adjustment base plate (18), and the adjustment base plate (18) is provided with a plurality of positioning copper pillars (20), and the support frame (10) is provided with positioning copper sleeves (21) that are plugged into and matched with the positioning copper pillars (20).

9. The automobile air conditioner suction cup step difference detection device according to claim 1, characterized in that: The electromagnets (2) are distributed in a circular array around the product positioning fixture (4).

10. A method for testing the step difference of a suction cup of an automobile air conditioner, characterized in that: The method comprises adopting the automobile air-conditioning suction cup step difference detection device according to any one of claims 1 to 9, and the method comprises the following steps: Step 1, correcting and determining the initial position of the product positioning jig (4), the initial data of the displacement sensor (5) and the uniqueness of the magnetic reference surface (201), placing a standard module on the product positioning jig (4), and then pressing the standard module down with the pressing head (1) until the reference B surface (301) on the standard module is initially fitted with the magnetic reference surface (201), then connecting the electromagnet (2) to a power source so that the reference B surface (301) on the standard module is tightly fitted with the magnetic reference surface (201), and then detecting and recording the standard data of the position of the product positioning jig (4) at this time with the displacement sensor (5); Step 2: After the standard data is recorded, the pressure head (1) is removed from the standard module, and after the product positioning fixture (4) is reset to the initial position, the standard module is removed; Step three, testing the suction cup component (3) to be tested according to the operating steps of the standard module in step one, so as to obtain actual data through the displacement sensor (5), and the difference between the standard data and the actual data is the step error of the suction cup component (3).

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