Splayed rubber pad symmetry degree detection device

Abstract

The utility model relates to a device for detecting the symmetry degree of a splayed rubber pad. The splayed rubber pad comprises an upper lining plate, a lower lining plate and a rubber layer arranged between the upper lining plate and the lower lining plate. The symmetry degree detection device comprises a longitudinal upper detection rod and a longitudinal lower detection rod; the longitudinal upper detection rod is provided with two end faces A, and the two end faces A are connected with the two ends of one side in the longitudinal direction Y in a clamped mode and provided with a longitudinal upper detection rod calibration end pointing to the calibration end of the longitudinal lower detection rod. The symmetry degree detection device further comprises a transverse upper detection rod and a transverse lower detection rod, the transverse upper detection rod is provided with two end faces C and clamped between the two upper positioning baffles, and the calibration end of the transverse upper detection rod points to the calibration end of the transverse lower detection rod. According to the utility model, the problems of complex operation and low efficiency during symmetry detection of the splayed rubber pad in the prior art are solved.

Description

Technical Field

[0001] The present application belongs to the field of rail transportation technology, and in particular relates to a device for detecting the symmetry of a figure-eight rubber pad. Background Art

[0002] Figure-eight rubber pads, also known as axlebox rubber pads, are widely used in the primary suspension system of three-piece railway freight car bogies. Installed between the sideframe and the load saddle, they consist of upper and lower metal linings in a figure-eight pattern with a vulcanized rubber layer in between. The figure-eight rubber pads are characterized by their ability to provide optimal stiffness in the vertical, lateral, and longitudinal directions to meet the requirements of wheelset elastic positioning. Their primary function is to reduce wheel-rail impact and vehicle vibration, thereby improving vehicle dynamics and reducing wheel-rail wear.

[0003] See Figure 1.

[0004] Normally, the figure-eight rubber pad is a symmetrical structure in the longitudinal and transverse directions. During bogie assembly, the upper lining plate is assembled with the side frame and positioned with the side frame through the two positioning blocks of the upper lining plate, and the lower lining plate is assembled with the load-bearing saddle and positioned through the positioning blocks of the lower lining plate and the load-bearing saddle. During assembly, if the longitudinal or transverse symmetry deviation of the positioning blocks of the upper and lower lining plates is large, after the figure-eight rubber pad is installed on the load-bearing and side frame, the figure-eight mounting surfaces of the upper and lower lining plates will not fit tightly with the side frame and the load-bearing saddle or will be misaligned. Even if the deformation of the rubber layer can compensate for the deviation, it will have an adverse effect on the fatigue service life of the figure-eight rubber pad to a certain extent, and will also have a harmful effect on the wheelset positioning effect and vehicle dynamic performance. Figure 2 This is a schematic diagram of the overall symmetry requirements for the upper and lower linings of the figure-eight rubber pad. The longitudinal symmetry requirement is m, and the transverse symmetry requirement is n.

[0005] The existing overall symmetry detection method can be accurately detected using a three-coordinate measuring machine. However, the three-coordinate operation is complex and costly, making it unsuitable for batch inspection of large quantities of truck parts. Utility Model Content

[0006] In response to the shortcomings in the relevant technology, the invention provides a device for detecting the symmetry of a figure-eight rubber pad, which solves the problems of complex operation and low efficiency in the existing technology when detecting the symmetry of a figure-eight rubber pad.

[0007] In a possible embodiment, a symmetry detection device for an eight-shaped rubber pad is provided, the eight-shaped rubber pad includes: an upper lining plate, a lower lining plate and a rubber layer arranged between the upper lining plate and the lower lining plate; the upper lining plate and the lower lining plate are in the shape of a figure eight; two parallel upper positioning blocks are provided above the eight-shaped middle connecting section of the upper lining plate; two parallel lower positioning blocks are provided below the eight-shaped middle connecting section of the lower lining plate; the symmetry detection device includes: a longitudinal upper detection rod and a longitudinal lower detection rod; wherein the longitudinal upper detection rod has two end faces A, and the two end faces A are clamped at the two ends of the upper positioning block on one side along the longitudinal direction Y; the longitudinal upper detection rod also includes a longitudinal upper detection rod calibration end, which is perpendicular to the upper positioning block along the longitudinal direction Y and the transverse X direction where the line connecting the two upper positioning blocks is located; the longitudinal upper detection rod calibration end is connected to the center of the two end faces A; the longitudinal lower detection rod includes two end faces B, and the two end faces B are clamped At both ends of the same side along the longitudinal direction Y, a longitudinal lower detection rod calibration end is set at the center of the longitudinal lower detection rod, and the longitudinal lower detection rod calibration end is a slot or a linear mark; the longitudinal upper detection rod calibration end points to the longitudinal lower detection rod calibration end; the symmetry detection device also includes: a transverse upper detection rod and a transverse lower detection rod, the transverse upper detection rod has two end faces C, and the two end faces C are clamped between the two upper positioning blocks, the transverse upper detection rod also includes a transverse upper detection rod calibration end set at the center of the two transverse end faces C, and the transverse upper detection rod calibration end is set along the eight-shaped inclined surface of the upper lining plate; the transverse lower detection rod has two end faces D, and the two end faces D are clamped between the two lower positioning blocks, the transverse lower detection rod also includes a transverse lower detection rod calibration end set at the center of the two transverse end faces D, and the transverse lower detection rod calibration end is a slot or a linear mark; the transverse upper detection rod calibration end points to the transverse lower detection rod calibration end.

[0008] In a possible embodiment, one of the two end surfaces A of the longitudinal detection rod is 0.5 mm to 1.5 mm larger than the maximum dimension of the upper positioning stop, and the other end is 0.5 mm to 1.5 mm smaller than the minimum dimension of the upper positioning stop.

[0009] In a possible implementation, the calibration ends of the upper and lower detection rods are designed as wedge-shaped structures with a certain angle according to the size of the positioning stop.

[0010] In a possible implementation, the slot width or the linear mark width of the calibration end of the longitudinal lower detection rod corresponds to the longitudinal symmetry tolerance zone value.

[0011] In a possible implementation, the slot width or the linear mark width of the calibration end of the lower transverse detection rod corresponds to the transverse symmetry tolerance zone value.

[0012] Based on the above technical scheme, the utility model discloses a symmetry detection device for a figure-eight rubber pad, installs a longitudinal upper detection rod, and the end face A of the longitudinal upper detection rod is clamped at the two ends of the upper positioning block, and the end face B of the longitudinal lower detection rod is clamped at the two ends of the lower positioning block. According to the alignment of the calibration end of the longitudinal upper detection rod and the calibration end of the longitudinal lower detection rod, the longitudinal symmetry of the rubber pad is judged, and the longitudinal symmetry is evaluated according to the deviation amount; the transverse upper detection rod is installed, and the end face C of the transverse upper detection rod is clamped between the two upper positioning blocks, and the end face D of the transverse lower detection rod is clamped between the two lower positioning blocks. According to the alignment of the calibration end of the transverse upper detection rod and the calibration end of the transverse lower detection rod, the transverse symmetry is evaluated, and the transverse symmetry of the rubber pad is evaluated by the misalignment of the calibration end; the detection device of the utility model detects the symmetry of the upper and lower lining plates of the figure-eight rubber pad in two different directions, namely, longitudinal and transverse directions. The operation is simple, the detection results are intuitive, and the detection efficiency is improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] The drawings described herein are used to provide further understanding of the invention and constitute a part of this application. The illustrative embodiments of the invention and their descriptions are used to explain the invention and do not constitute improper limitations on the invention.

[0014] In the attached figure:

[0015] Figure 1a It is a schematic diagram of the structure of the figure eight rubber pad;

[0016] Figure 1b This is a schematic diagram of the bottom structure of the figure eight rubber pad;

[0017] Figure 2 This is a schematic diagram of the overall symmetry requirements for the figure eight rubber pad;

[0018] Figure 3 Schematic diagram of the structure of the longitudinal upper detection rod and the longitudinal lower detection rod;

[0019] Figure 3a Schematic diagram of the wedge-shaped structure of the longitudinal detection rod

[0020] Figure 4 Schematic diagram of the structure of the upper horizontal detection rod and the lower horizontal detection rod;

[0021] Figure 5 This is the schematic diagram of symmetry detection and calculation.

[0022] In the picture:

[0023] 1-upper lining; 2-rubber layer; 3-lower lining; 4-upper positioning stop; 5-lower positioning stop;

[0024] 6-upper longitudinal detection rod; 7-lower longitudinal detection rod; 6.1-calibration end of upper longitudinal detection rod; 7.1-calibration end of lower longitudinal detection rod;

[0025] 8-upper horizontal detection rod; 9-lower horizontal detection rod; 8.1-calibration end of upper horizontal detection rod; 9.1-calibration end of lower horizontal detection rod. DETAILED DESCRIPTION

[0026] The following will be combined with the accompanying drawings in the examples of this application to clearly and completely describe the technical solutions in the embodiments. Obviously, the described embodiments are only part of the embodiments of this application, not all of the embodiments. Based on the embodiments of this application, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of this application.

[0027] In the description of this application, it should be understood that the terms "center", "lateral", "longitudinal", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on this application.

[0028] The terms "first," "second," and "third" are used for descriptive purposes only and should not be understood to indicate or imply relative importance or to implicitly specify the quantity of the technical features indicated. Therefore, a feature specified as "first," "second," or "third" may explicitly or implicitly include one or more of such features.

[0029] In the description of this application, it should be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" should be understood broadly. For example, they can refer to fixed connections, detachable connections, or integral connections; they can refer to direct connections, indirect connections through an intermediate medium, or internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in this application based on the specific circumstances.

[0030] In order to solve the problems of complex operation and low efficiency in the prior art when detecting the symmetry of a figure-eight rubber pad, the present application proposes a device for detecting the symmetry of a figure-eight rubber pad.

[0031] See also Figure 3 、 Figure 4 and Figure 5In one possible embodiment, the figure-eight rubber pad symmetry detection device is used to detect the symmetry of the figure-eight rubber pad; the figure-eight rubber pad includes an upper lining plate 1, a lower lining plate 3, and a rubber layer 2 arranged between the upper lining plate 1 and the lower lining plate 3; the upper lining plate 1 and the lower lining plate 3 are in the shape of a figure-eight, wherein two parallel upper positioning stops 4 are provided above the figure-eight middle connecting section of the upper lining plate 1, and two parallel lower positioning stops 5 are provided below the figure-eight middle connecting section of the lower lining plate 3;

[0032] The symmetry detection device includes a longitudinal upper detection rod 6, a longitudinal lower detection rod 7, a transverse upper detection rod 8 and a transverse lower detection rod 9, wherein:

[0033] The upper longitudinal detection rod 6 comprises two end faces A, which are clamped at the two ends of the longitudinal Y direction of the upper positioning block 4 on one side; a longitudinal upper detection rod calibration end 6.1 is connected to the center of the upper longitudinal detection rod 6, and the longitudinal upper detection rod calibration end 6.1 is arranged along the transverse X direction and perpendicular to the direction of the connecting line of the upper positioning block 4; the lower longitudinal detection rod 7 comprises two end faces B, which are clamped at the two ends of the longitudinal Y direction of the lower positioning block 5 on the same side; a longitudinal lower detection rod calibration end 7.1 is provided at the center of the lower longitudinal detection rod 7, and the calibration end 7.1 is a slot or a linear mark; the upper longitudinal detection rod calibration end 6.1 points to the longitudinal lower detection rod calibration end 7.1; the upper transverse detection rod 8: the two end faces C of the upper transverse detection rod 8 are clamped between the two upper positioning blocks 4, and a transverse upper detection rod calibration end 8.1 is provided at the center thereof, and the calibration end 8.1 is arranged along the figure-eight inclined surface of the upper lining plate 1;

[0034] The two end faces D of the horizontal lower detection rod 9 are clamped between the two lower positioning blocks 5. The center of the horizontal lower detection rod is provided with a horizontal lower detection rod calibration end 9.1, which is a slot or linear mark.

[0035] The upper transverse detection rod calibration end 8.1 points to the lower transverse detection rod calibration end 9.1.

[0036] Clip the end face A of the upper longitudinal detection rod 6 to the two ends of the upper positioning block 4 to ensure that the detection rod 6 is fixed in the longitudinal direction (Y direction) of the figure-eight rubber pad; similarly, clip the end face B of the lower longitudinal detection rod 7 to the two ends of the lower positioning block 5 to complete the longitudinal alignment; check the alignment of the upper longitudinal detection rod calibration end 6.1 and the lower longitudinal detection rod calibration end 7.1 to determine the longitudinal symmetry of the rubber pad; if the upper longitudinal detection rod calibration end 6.1 and the lower longitudinal detection rod calibration end 7.1 are accurately aligned in the longitudinal direction, they are completely symmetrical; otherwise, the longitudinal symmetry deviation is evaluated by the misalignment of the upper longitudinal detection rod calibration end 6.1 and the lower longitudinal detection rod calibration end 7.1.

[0037] In this solution, by providing multiple calibration terminals, the longitudinal and transverse symmetry of the figure-eight rubber pad can be accurately tested. The rationally designed clamping structure of the detection rod facilitates installation and removal, making it suitable for batch testing. Calibration using stable mechanical calibration marks (such as slots or linear markings) avoids human error and ensures repeatable test results. This system is suitable for various specifications of figure-eight rubber pads, offering high flexibility and versatility.

[0038] See also Figure 3a In one possible embodiment, the two end faces A1-A1' and A2-A2' of the detection rod 6 in the longitudinal direction have different sizes; the size of one end face A1-A1' is 0.5mm to 1.5mm larger than the maximum length of the upper positioning stop 4, and the size A2-A2' of the other end face A is 0.5mm to 1.5mm smaller than the minimum size of the upper positioning stop 4.

[0039] By setting the end face A of the longitudinal detection rod 6 to an unequal size structure, the larger end face A1-A1' at one end is matched with the maximum size of the upper positioning stop 4, and the smaller end face A2-A2' at the other end is matched with the minimum size of the upper positioning stop 4, the positioning control between the detection rod and the positioning stop is achieved.

[0040] In one possible embodiment, the end faces of the longitudinal lower detection rod 7, the transverse upper detection rod 8 and the transverse lower detection rod 9 are designed to be wedge-shaped structures at a certain angle according to the size of the positioning block, that is, the structure and size settings are similar or the same as A1-A1' and A2-A2'. The wedge-shaped structure is used to facilitate the connection and positioning of the detection rod and the positioning block.

[0041] In a possible embodiment, the slot width or the linear mark width of the longitudinal lower detection rod calibration end 7.1 corresponds to the tolerance band value of the longitudinal symmetry.

[0042] By setting the slot width or linear mark width of the longitudinal lower detection rod calibration end 7.1 to a size equal to or corresponding to the tolerance zone value, it is possible to visually judge whether the longitudinal symmetry meets the tolerance requirements by observing whether the slot width or mark width matches the offset between the upper and lower lining plates during testing.

[0043] In a possible embodiment, secondary scale marks are added to the slot to indicate a finer tolerance range.

[0044] In a possible embodiment, the slot width or the linear mark width of the lateral lower detection rod calibration end 9.1 corresponds to the tolerance band value of the lateral symmetry.

[0045] The calibrated end 9.1 of the transverse lower detection rod matches the transverse symmetry tolerance band through its slot width or linear mark width. If the transverse symmetry deviation exceeds the tolerance band, the width characteristic of the calibrated end can quickly detect the excess.

[0046] The one-to-one correspondence between the slot width at the calibration end and the tolerance band makes transverse symmetry testing efficient and reliable. Inspectors can quickly determine whether transverse symmetry is within tolerance simply by observing the slot or mark width, without the need for additional tools. This design not only simplifies the process but also reduces the possibility of inspection errors.

[0047] The symmetry detection device for a figure-eight rubber pad according to an embodiment of the present invention is described as follows:

[0048] In response to the shortcomings of existing detection devices and methods, the present invention designs a detection device with a simpler structure and a more efficient detection method. By designing lightweight longitudinal and transverse positioning detection rods for the upper and lower lining plates respectively, and directly fixing the (longitudinal and transverse) upper and lower detection rods to the upper and lower positioning stop parts through wedge surfaces, the symmetry qualification test can be achieved by visual inspection through the relative deviation position of the calibration surfaces of the calibration ends of the upper and lower detection rods and the calibration groove of the lower detection rod, which greatly reduces the detection difficulty and improves the detection efficiency and accuracy.

[0049] The symmetry detection device of the figure eight rubber pad includes a longitudinal upper detection rod 6, a longitudinal lower detection rod 7, a transverse upper detection rod 8 and a transverse lower detection rod 9. Figure 3 and Figure 4 .

[0050] The design principle and detection method of the longitudinal symmetry detection device are used as an example to illustrate:

[0051] Step 1 - Positioning:

[0052] The two end faces A on the rod body of the longitudinal detection rod 6 are symmetrically designed to be wedge surfaces with a certain small angle. One end of the two end faces A is preferably designed to be larger than the maximum size of the longitudinal upper stop of the upper lining plate by 0.5mm~1.5mm, and the other end is preferably designed to be smaller than the minimum size of the longitudinal upper stop by 0.5mm~1.5mm. This design can ensure that the two end faces of the detection rod A are effectively attached to the upper lining plate stop and are positioned stably. During the inspection, the two end faces of A are matched with the two sides of the longitudinal upper stop of the figure-eight rubber pad, and the large end of the two end faces of the detection rod A is pushed inward parallel to the two sides of the longitudinal upper stop by relying on the plane of the upper lining plate until the dimensions are the same, and the calibration end 6.1 is vertically downward. Using the same principle and method, push the two end faces of the longitudinal lower detection rod B into the two sides of the lower lining plate stop until the dimensions are the same, and the calibration end 7.1 is vertically upward.

[0053] Step 2 - Detection:

[0054] After positioning is completed, the right side of the calibration end 6.1 of the longitudinal upper detection rod is designed as the center plane of the upper detection rod, i.e. the longitudinal upper stopper. The center position of the longitudinal lower detection rod is slotted as the calibration end 7.1. The theoretical center plane in the slot width direction is the center plane of the longitudinal lower positioning block. The width dimension of the slot is the longitudinal symmetry tolerance band value m of the figure eight rubber pad. When detecting symmetry, it is possible to determine whether the longitudinal symmetry of the upper and lower liners is qualified by visually inspecting whether the deviation between the right side of the calibration end 6.1 and the calibration end slot 7.1 is within the width range of the slot. This allows for intuitive and rapid batch determination. If a specific value of symmetry needs to be detected, a vernier caliper can be used to measure the minimum unilateral deviation a between the right side of the calibration end 6.1 and the two end faces of the calibration end slot 7.1. When the right side of the calibration end 6.1 falls within the detection end slot, the symmetry tolerance value is m-2a; when the right side of the calibration end 6.1 falls outside the detection end slot, the symmetry tolerance value is 2a+m, see Figure 5 .

[0055] The design principle and testing method of the transverse symmetry detection device are the same as those of the longitudinal symmetry detection device. The two end faces of C of the upper transverse detection rod 8 are positioned with the transverse positioning block of the upper lining plate, while the two end faces of D of the lower transverse detection rod 9 are positioned with the transverse positioning block of the lower lining plate. When testing symmetry, the notches of the calibration end 8.1 of the upper transverse detection rod 8 and the calibration end 9.1 of the lower transverse detection rod are used for testing. If the right side of the calibration end 8.1 of the upper transverse detection rod 8 falls within the notch width of the calibration end 9.1, the symmetry is qualitatively determined to be qualified. To test the specific symmetry deviation value, the same principle as testing longitudinal symmetry can be used as a reference to the longitudinal symmetry testing method.

[0056] The structure of the "Splayed Rubber Pad Symmetry Detection Device and Method" in this utility model patent application has six advantages over conventional devices and methods:

[0057] 1. This utility model is designed to detect the symmetry of the upper and lower lining plates of the figure-eight rubber pad in two different directions, longitudinally and transversely. Compared with conventional devices, it is simpler and lighter in weight, making it easier to transport or carry.

[0058] 2. The upper and lower calibration rods of the present invention can realize the detection function by integral processing, welding after processing, or fastening with screws. Compared with conventional detection devices, the manufacturing is more diverse and more processing methods can be selected;

[0059] 3. The present invention ensures that the symmetry of the calibration surface of the upper detection rod and the calibration groove of the lower detection rod can be intuitively detected by controlling the high-precision dimensional processing tolerance, which is more intuitive than the detection method of conventional devices;

[0060] 4. The calibration ends of the upper and lower detection rods of the utility model are designed as wedge-shaped structures at a certain angle according to the size of the positioning block, which is convenient for positioning the upper and lower detection rods and can be quickly positioned for positioning block widths with different tolerance ranges. Compared with conventional detection devices that use guide rod sliding or adjusting screws to align the detection position, it has fewer parts, a simpler structure, is easier to process and measure with high precision, and is more efficient to operate.

[0061] 5. The present invention designs the detection surface of the upper detection rod to be the center plane position of the upper positioning block, and the center plane of the calibration groove of the lower detection rod to be the center plane position of the lower positioning block. The width value of the groove is the value of the symmetry tolerance zone. The deviation between the detection surface of the upper detection rod, i.e., the center plane of the upper positioning block, and the center plane of the calibration groove, i.e., the center plane of the lower positioning block, is equal to the deviation of the symmetry center plane. If the center plane exceeds the two end surfaces of the calibration groove, it means that the symmetry exceeds the tolerance zone. This method can more intuitively detect whether the symmetry is qualified through visual inspection. Compared with the conventional detection device that manually adjusts the tooling, measures the distance and then calculates the symmetry, it is more intuitive and efficient, greatly improving the detection efficiency.

[0062] 6. The present invention can quickly detect and judge the degree of symmetry, and can also calculate the accurate value of the degree of symmetry by measuring the distance. Compared with conventional detection devices, it can simultaneously realize the functions of qualitative detection and quantitative detection.

[0063] Finally, it should be noted that the various embodiments in this specification are described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same or similar parts between the various embodiments can be referenced to each other.

[0064] The above embodiments are only used to illustrate the technical solutions of the present application and are not intended to limit the same. Although the present application has been described in detail with reference to the preferred embodiments, ordinary technicians in the relevant field should understand that the specific implementation methods of the present application can still be modified or some technical features can be replaced by equivalents without departing from the spirit of the technical solutions of the present application. They should all be included in the scope of the technical solutions for which protection is requested in the present application.

Claims

1. A device for detecting the symmetry of a figure-eight rubber pad, the figure-eight rubber pad comprising: An upper lining plate (1), a lower lining plate (3), and a rubber layer (2) arranged between the upper lining plate (1) and the lower lining plate (3); the upper lining plate (1) and the lower lining plate (3) are shaped like an eight; two parallel upper positioning stops (4) are provided above the eight-shaped middle connecting section of the upper lining plate (1); two parallel lower positioning stops (5) are provided below the eight-shaped middle connecting section of the lower lining plate (3); It is characterized in that the symmetry detection device comprises: A longitudinal upper detection rod (6) and a longitudinal lower detection rod (7); wherein the longitudinal upper detection rod (6) has two end faces A, the two end faces A being clamped to the two ends of the upper positioning block (4) on one side along the longitudinal direction Y; the longitudinal upper detection rod (6) further comprises a longitudinal upper detection rod calibration end (6.1), which is perpendicular to the direction of the upper positioning block (4) along the longitudinal direction Y and the transverse direction X where the line connecting the two upper positioning blocks (4) is located; the upward detection rod calibration end (6.1) is connected to the centers of the two end faces A; the longitudinal lower detection rod (7) comprises two end faces B, the two end faces B being clamped to the two ends of the lower positioning block (5) on the same side along the longitudinal direction Y; the longitudinal lower detection rod calibration end (7.1) is provided at the center of the longitudinal lower detection rod (7), and the longitudinal lower detection rod calibration end (7.1) is a slotted or linear mark; The longitudinal upper detection rod calibration end (6.1) points to the longitudinal lower detection rod calibration end (7.1); The symmetry detection device also includes: The upper transverse detection rod (8) and the lower transverse detection rod (9) are provided. The upper transverse detection rod (8) has two end faces C, the two end faces C are clamped between the two upper positioning blocks (4), and the upper transverse detection rod (8) further includes a transverse upper detection rod calibration end (8.1) arranged at the center of the two transverse end faces C. The transverse upper detection rod calibration end (8.1) is arranged along the figure-eight inclined surface of the upper lining plate (1); the lower transverse detection rod (9) has two end faces D, the two end faces D are clamped between the two lower positioning blocks (5), and the lower transverse detection rod (9) further includes a transverse lower detection rod calibration end (9.1) arranged at the center of the two transverse end faces D. The transverse lower detection rod calibration end (9.1) is a slot or a linear mark. The calibrated end (8.1) of the upper transverse detection rod points to the calibrated end (9.1) of the lower transverse detection rod.

2. The symmetry detection device for the figure eight rubber pad according to claim 1, characterized in that: The two end faces A of the longitudinal detection rod (6) and the engaging surface of the upper positioning block (4) are wedge-shaped structures, one end of the two end faces A1-A1' is larger than the maximum size of the upper positioning block (4) by 0.5mm to 1.5mm, and the other end A2-A2' is smaller than the minimum size of the upper positioning block (4) by 0.5mm to 1.5mm.

3. The symmetry detection device for the figure eight rubber pad according to claim 2, characterized in that: The two end faces B of the longitudinal lower detection rod (7) and the engaging surface of the lower positioning block (5) are the same wedge-shaped structure as the end face A.

4. The symmetry detection device for the figure eight rubber pad according to claim 3, characterized in that: The two end faces C of the transverse upper detection rod (8) and the engaging surfaces of the two upper positioning stops (4) are the same wedge-shaped structures as the end faces A.

5. The symmetry detection device for the figure eight rubber pad according to claim 4, characterized in that: The two end faces D of the horizontal lower detection rod (9) and the engaging faces of the two lower positioning blocks (5) are wedge-shaped structures identical to the end faces A.

6. The device for detecting symmetry of the figure eight rubber pad according to claim 5, characterized in that: The width of the slot or the width of the linear mark on the longitudinal lower calibration end (7.1) corresponds to the value of the longitudinal symmetry tolerance zone.

7. The device for detecting symmetry of the figure eight rubber pad according to claim 6, characterized in that: The width of the slot or the width of the linear mark at the calibration end (9.1) of the lower transverse detection rod corresponds to the value of the transverse symmetry tolerance zone.

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