A detection device for composite material automobile leaf spring

Abstract

The present invention relates to a detection device for composite material automobile leaf spring. The device comprises a support frame, a suspension fixing mechanism is suspended on the support frame, and the suspension fixing mechanism is used to suspend and fix the composite material automobile leaf spring on the support frame; an upper auxiliary measuring plate is horizontally and laterally fixed on the suspension fixing mechanism, and the bottom surface of the plate is kept flush with the center line between the two end ears of the composite material automobile leaf spring; a lower auxiliary measuring plate is horizontally and laterally arranged; a first driving device is arranged on the support frame and connected to the lower auxiliary measuring plate, and the first driving device is used to move the lower auxiliary measuring plate up and down in the vertical direction; when the first driving device is in a stationary state, the first driving device and the support frame are in a locked state; a ruler is arranged vertically; a second driving device is arranged on the support frame and connected to the ruler, and the second driving device is used to move the ruler up and down in the vertical direction. The present invention solves the problem of large data error in the detection of the arc height of the composite material automobile leaf spring measured manually.

Description

Technical Field

[0001] The invention relates to the technical field of composite material automobile leaf springs, in particular to a detection device for composite material automobile leaf springs. Background Art

[0002] Composite automotive leaf springs are made of composite materials and are elastic elements in the automotive suspension system. They are related to the rationality of the vehicle's posture and suspension bounce. Therefore, the detection of the arc height of composite automotive leaf springs is an important indicator for testing the quality of finished composite automotive leaf springs. The arc height of composite automotive leaf springs refers to the distance between the center line between the two end ears of the composite automotive leaf spring and the center of the buckle plate (or pad) on the arc-shaped body of the composite automotive leaf spring.

[0003] At present, manual measurement is mostly used to detect the arc height of composite automotive leaf springs. Specifically, the inspector uses a thin wire (mostly a fishing line) to connect two ears, and then uses a ruler to measure the distance between the thin wire between the ears at both ends of the composite automotive leaf spring and the center of the top surface of the buckle plate (or pad) on the arc-shaped body of the composite automotive leaf spring. Since the inner sides of the ears at both ends of the composite automotive leaf spring are not flat, it is difficult to ensure that the end of the thin wire is always flush with the center of the ear when buckled with the ear. The flatness of the pad or buckle plate on the arc-shaped body of the composite automotive leaf spring cannot be guaranteed, which makes it difficult to use a ruler for direct measurement and the holding of tools such as rulers and thin wires is unstable during manual inspection. Therefore, the data error of the manually measured arc height of the composite automotive leaf spring is large. Summary of the invention

[0004] In order to solve the above technical problems, the present invention proposes a detection device for a composite material automobile leaf spring. The detection device for a composite material automobile leaf spring adopts auxiliary measuring objects with stable positions and convenient for ruler measurement to be arranged at the center connecting line between the two end ears of the composite material automobile leaf spring and the center bottom surface of the arc-shaped body of the composite material automobile leaf spring, and then the ruler is mechanically driven to cooperate with the auxiliary measuring objects to complete the detection of the arc height of the composite material automobile leaf spring.

[0005] The technical solution to achieve the purpose of the present invention is: a detection device for composite material automobile leaf spring, comprising:

[0006] Support frame;

[0007] A suspension fixing mechanism, which is suspended on the support frame, and the suspension fixing mechanism is used to suspend and fix the composite material automobile leaf spring on the support frame;

[0008] An upper auxiliary measuring plate, which is horizontally fixed on the suspension fixing mechanism and whose bottom surface is kept flush with the center line between the two end ears of the composite automobile leaf spring;

[0009] A lower auxiliary measuring plate, which is arranged horizontally;

[0010] a first driving device, which is arranged on the support frame and connected to the lower auxiliary measurement plate, and is used to move the lower auxiliary measurement plate up and down in a vertical direction; when the first driving device is in a stationary state, the first driving device and the support frame are in a locked state;

[0011] a ruler, which is arranged vertically;

[0012] A second driving device, which is disposed on the support frame and connected to the ruler, and the second driving device is used to move the ruler up and down in the vertical direction;

[0013] When the height of the composite automobile leaf spring is tested, the suspension fixing mechanism suspends and fixes the composite automobile leaf spring on the support frame, and the lower auxiliary measuring plate is driven by the first driving device to move upward until the top surface of the lower auxiliary measuring plate is in non-compression contact with the central bottom surface of the main body of the composite automobile leaf spring, and the ruler is driven by the second driving device to move downward until the lower end of the ruler is in contact with the top surface of the lower auxiliary measuring plate, and at this time, the back of the ruler is in contact with the upper auxiliary measuring plate and the front of the composite automobile leaf spring.

[0014] In some embodiments, the support frame comprises:

[0015] Pedestal;

[0016] A top plate, located above the base;

[0017] Two support columns, both of which are arranged vertically and are used to connect the base and the top plate;

[0018] An intermediate plate is horizontally arranged between the two support columns, and both sides of the center of the intermediate plate have movable holes;

[0019] The threaded barrel has threads on its inner side wall and is arranged vertically. The lower end of the threaded barrel has an extension portion extending vertically downward, and the extension portion has a sliding groove. The threaded barrel is fixedly arranged at the center of the middle plate.

[0020] In some embodiments, the first driving device comprises:

[0021] The straight rod has a thread on its upper outer surface that matches the thread on the inner wall of the threaded barrel and a smooth lower outer surface. The upper end of the straight rod is fixedly connected to the bottom surface of the lower measurement auxiliary plate.

[0022] In some embodiments, the first driving device further comprises:

[0023] A hand-held part is fixedly connected to the lower end of the straight rod.

[0024] In some embodiments, the first driving device further comprises:

[0025] A disc-shaped member, wherein the middle of the disc-shaped member has a through hole for the straight rod to pass through, and the bottom surface of the disc-shaped member is in contact with the top surface of the handheld portion;

[0026] Two sliding posts, which are respectively fixedly arranged on the disc-shaped member and located on both sides of the through hole, and the two sliding posts are arranged vertically upward and slide in cooperation with the sliding groove of the extension part;

[0027] Two movable columns, the lower ends of which are respectively fixedly arranged on the disc-shaped member and located on both sides of the through hole, and the upper ends of the two movable columns are movably passed through the movable hole of the middle plate to the top of the middle plate;

[0028] Two buffer springs, which are respectively sleeved on the two movable columns;

[0029] Two limit blocks, which are respectively fixedly arranged at the upper ends of the two movable columns, and the size of each limit block is larger than the aperture of the movable hole of the middle plate;

[0030] When the top surface of the lower auxiliary measuring plate maintains non-compression contact with the central bottom surface of the main body of the composite material automobile leaf spring, the two buffer springs are in a compressed state.

[0031] In some embodiments, the suspension fixing mechanism comprises:

[0032] Two hanging rods, both upper ends of which are fixed to the top plate;

[0033] Two embedded columns, the rear ends of which are respectively fixedly connected to the lower ends of the two hanging rods, and the two embedded columns have threads on the outer surfaces of the front ends;

[0034] Two sets, which are respectively sleeved on the front ends of the two embedded columns, and the upper auxiliary measurement plate is connected between the two sets;

[0035] Two fixing collars, both of which are sleeved on the front end of the embedded column and have threads on the inner side walls thereof that match the threads on the front end of the embedded column;

[0036] When the height of the composite vehicle leaf spring is tested, the front ends of the two embedded columns pass through the corresponding ears on the composite vehicle leaf spring, and the ears on the composite vehicle leaf spring are fixed on the embedded columns by screwing in and extruding the fixing ring.

[0037] In some embodiments, the second driving device includes:

[0038] A vertical seat, which has a vertical slide rail extending in the vertical direction, and the vertical seat is fixedly arranged on the top plate;

[0039] A vertical motor, which is fixedly arranged on the vertical seat;

[0040] A vertical screw rod, which is arranged vertically and one end of which is connected to the output end of the vertical motor;

[0041] A vertical nut, which is sleeved on the vertical screw rod, so that the vertical nut and the vertical screw rod form a vertical screw rod transmission connection;

[0042] A clamping seat, which is fixedly connected to the front side of the vertical nut and slidably connected to the vertical slide rail on the vertical seat, and the clamping seat holds the ruler in a clamped and fixed state;

[0043] The vertical screw is driven by the vertical motor to rotate, so that the vertical nut moves linearly along the length of the vertical screw on the vertical screw, thereby driving the clamping seat and the ruler on the clamping seat to move up and down.

[0044] In some embodiments, the clamping seat includes:

[0045] Two clamping blocks are connected by a screw rod, and a clamping groove for clamping and fixing the ruler is provided between the two clamping blocks.

[0046] Compared with the prior art, the present invention has the following significant advantages:

[0047] The detection device of the composite material automobile leaf spring of the present invention adopts the method of setting an upper auxiliary measuring plate at the center line between the two end ears of the composite material automobile leaf spring; using the top surface of the lower auxiliary measuring plate to maintain non-extrusion contact with the central bottom surface of the main body of the composite material automobile leaf spring, the center of the top surface of the upper buckle plate of the arc-shaped main body of the composite material automobile leaf spring is translated to a certain distance above the lower auxiliary measuring plate, and the upper auxiliary measuring plate and the lower auxiliary measuring plate together form an auxiliary measuring object with a stable position and convenient for rapid measurement by a ruler. Because the back of the ruler is in contact with the upper auxiliary measuring plate and the front of the buckle plate in the composite material automobile leaf spring, the risk of a large reading error caused by the distance between the ruler and the measuring object is reduced. The measuring area of ​​the ruler includes the lower auxiliary measuring plate. The area between the top surface of the plate and the upper auxiliary measuring plate; the arc height of the composite material automobile leaf spring can also be obtained by measuring the distance between the upper auxiliary measuring plate and the lower auxiliary measuring plate of the ruler, and then subtracting the distance from the bottom surface of the arc-shaped body of the composite material automobile leaf spring to the top surface of the buckle plate from the distance; the problem that the inner sides of the ears at both ends of the composite material automobile leaf spring are not flat, it is difficult to ensure that the end of the thin wire is always flush with the center of the ear when buckled with the ear, the flatness of the pad or the buckle plate on the arc-shaped body of the composite material automobile leaf spring cannot be guaranteed, which makes it difficult to use a ruler to directly measure, and the holding of tools such as rulers and thin wires is unstable during manual detection, so the data error of the manually measured arc height of the composite material automobile leaf spring is large. BRIEF DESCRIPTION OF THE DRAWINGS

[0048] Figure 1 It is a schematic structural diagram of a detection device for a composite material automobile leaf spring in one embodiment of the present invention.

[0049] Figure 2 It is a schematic structural diagram of a support frame in one embodiment of the present invention.

[0050] Figure 3 It is a structural schematic diagram of a threaded barrel in one embodiment of the present invention.

[0051] Figure 4 It is a schematic structural diagram of a first driving device in one embodiment of the present invention.

[0052] Figure 5 It is a schematic diagram of the connection between the suspension fixing mechanism and the upper auxiliary measurement plate in one embodiment of the present invention.

[0053] Figure 6 It is a schematic structural diagram of a second driving device in one embodiment of the present invention.

[0054] Reference numerals: 10, support frame; 101, base; 102, top plate; 103, support column; 104, middle plate; 1041, movable hole; 105, threaded cylinder; 1051, extension; 10511, sliding groove; 20, suspension fixing mechanism; 201, suspension rod; 202, embedded column; 203, kit; 204, fixing collar; 30, upper auxiliary measuring plate; 40, center line; 50, lower auxiliary measuring plate; 60, first driving device; 6 01. Straight rod; 602. Hand-held part; 603. Disc-shaped part; 6031. Perforation; 604. Sliding column; 605. Movable column; 606. Buffer spring; 607. Limit block; 70. Ruler; 80. Second drive device; 801. Vertical seat; 802. Vertical motor; 803. Vertical lead screw; 804. Vertical nut; 805. Clamping seat; 8051. Screw; 8052. Clamping block; 8053. Clamping groove; 90. Composite material automotive leaf spring. DETAILED DESCRIPTION

[0055] The embodiments of the present invention are described in detail below with reference to the accompanying drawings.

[0056] like Figure 1 As shown, in one embodiment of the present invention, a detection device for a composite material automobile leaf spring is provided, comprising: a support frame 10, a suspension fixing mechanism 20, an upper auxiliary measuring plate 30, a lower auxiliary measuring plate 50, a first driving device 60, a ruler 70 and a second driving device 80.

[0057] like Figure 2 As shown, in one embodiment, the support frame 10 includes: a base 101, a top plate 102, two support columns 103, an intermediate plate 104, a threaded cylinder 105, a suspension fixing mechanism 20, an upper auxiliary measuring plate 30, a lower auxiliary measuring plate 50 and a first driving device 60.

[0058] The base 101 is in a rectangular parallelepiped shape and is laid on the ground;

[0059] The top plate 102 is arranged horizontally and is located above the base 101;

[0060] The two support columns 103 are both arranged vertically and are used to connect the base 101 and the top plate 102. Specifically, the lower ends of the two support columns 103 are fixed on the top surface of the base 101 and the upper ends are fixed on the bottom surface of the top surface. The two support columns 103 are arranged on both sides of the base 101.

[0061] The middle plate 104 is horizontally arranged between the two support columns 103 , and has movable holes 1041 on both sides of the center of the middle plate 104 ; specifically, the two ends of the middle plate 104 are fixedly connected to the two support columns 103 , and the middle plate 104 is located between the base 101 and the top plate 102 .

[0062] like Figure 3 As shown, the inner wall of the threaded barrel 105 has threads and is arranged vertically. The lower end of the threaded barrel 105 has an extension portion 1051 extending vertically downward. The extension portion 1051 has a sliding groove 10511. The threaded barrel 105 is fixedly arranged at the center of the middle plate 104.

[0063] The upper auxiliary measurement plate 30 is horizontally fixed on the suspension fixing mechanism 20, and the bottom surface of the plate is kept flush with the center line 40 between the two end ears of the composite material automobile leaf spring 90. The lower auxiliary measurement plate 50 is horizontally arranged, and the upper auxiliary measurement plate 30 and the lower auxiliary measurement plate 50 are both used as auxiliary measurement objects.

[0064] The suspension fixing mechanism 20 is suspended on the support frame 10, and the suspension fixing mechanism 20 is used to suspend and fix the composite material automobile leaf spring 90 on the support frame 10;

[0065] like Figure 5 As shown, in one embodiment, the suspension fixing mechanism 20 includes: two suspension rods 201 , embedded columns 202 , a kit 203 and a fixing ring 204 .

[0066] The upper ends of the two hanging rods 201 are fixed on the top plate 102 , and the two hanging rods 201 are arranged near the left and right side ends of the top plate 102 , and the two hanging rods 201 are placed vertically.

[0067] The rear ends of the two embedded columns 202 are respectively fixedly connected to the lower ends of the two suspension rods 201, and the outer surfaces of the front ends of the two embedded columns 202 have threads. The shape and size of the upper columns of the two embedded columns 202 are adapted to the ears on the composite material automobile leaf spring 90, so that the embedded columns 202 and the ears form a stable connection relationship.

[0068] The two sets 203 are respectively sleeved on the front ends of the two embedded columns 202, and the upper auxiliary measurement plate 30 is fixedly connected between the two sets 203. The sets 203 are ring-shaped.

[0069] The two fixing collars 204 are respectively sleeved on the front end of each embedded column 202 and have threads on the inner side walls thereof that match the threads on the front end of the embedded column 202 .

[0070] The sleeve 203 is located at the rear side of the fixing collar 204 , and the sleeve 203 moves to press against the suspension rod 201 .

[0071] When the height of the composite material automobile leaf spring 90 is tested, the front ends of the two embedded columns 202 pass through the corresponding ears on the composite material automobile leaf spring 90, and the ears on the composite material automobile leaf spring 90 are fixed to the embedded columns 202 by screwing in and squeezing the fixing collar 204. The tightening of the fixing collar 204 sequentially squeezes the sleeve 203 and the ears, and transmits the squeezing force to the suspension rod 201.

[0072] The first driving device 60 is disposed on the support frame 10 and connected to the lower auxiliary measurement plate 50. The first driving device 60 is used to move the lower auxiliary measurement plate 50 up and down in the vertical direction. When the first driving device 60 is in a stationary state, the first driving device 60 and the support frame 10 are in a locked state.

[0073] like Figure 4 As shown, in one embodiment, the first driving device 60 includes: a straight rod 601, and the straight rod 601 is cylindrical.

[0074] The upper outer surface of the straight rod 601 has threads that match the threads on the inner side wall of the threaded barrel 105, while the lower outer surface is smooth. The upper end of the straight rod 601 is fixedly connected to the bottom surface of the lower measurement auxiliary plate. The straight rod 601 matches the threads of the threaded barrel 105 through its rod body, and the straight rod 601 is screwed in to cause it to rotate and move linearly upward, causing the lower measurement auxiliary plate at its upper end to move linearly up and down. Since the top surface of the lower auxiliary measurement plate 50 maintains non-extrusion contact with the main body center bottom surface of the composite material automobile leaf spring 90, that is, the lower auxiliary measurement plate 50 covers the main body center bottom surface of the composite material automobile leaf spring 90 in the vertical direction, and the lower auxiliary measurement plate 50 always maintains vertical linear movement under the action of the straight rod 601, and the position of the straight rod 601 is limited by the threaded barrel 105, so the threaded barrel 105 should be aligned with the main body center bottom surface of the composite material automobile leaf spring 90 at the beginning.

[0075] like Figure 5 As shown, in one embodiment, the first driving device 60 also includes: a hand-held part 602, which is fixedly connected to the lower end of the straight rod 601, and the hand-held part 602 is in the shape of a short column, and scratches are engraved on its outer surface to facilitate the inspection personnel to operate the hand-held part 602 to rotate the straight rod 601.

[0076] like Figure 5 As shown, in one embodiment, the first driving device 60 further includes: a disk-shaped member 603 .

[0077] The disk-shaped member 603 is in the shape of a disk and has a through hole 6031 in the middle for the straight rod 601 to pass through. The bottom surface of the disk-shaped member 603 contacts the top surface of the hand-held portion 602 . The size of the hand-held portion 602 is larger than the aperture size of the through hole 6031 of the disk-shaped member 603 .

[0078] The two sliding posts 604 are respectively fixedly disposed on the disk-shaped member 603 and are located on both sides of the through hole 6031 . The two sliding posts 604 are vertically disposed upward and slide in cooperation with the sliding groove 10511 of the extension portion 1051 .

[0079] The lower ends of the two movable columns 605 are respectively fixedly disposed on the disk-shaped member 603 and are located on both sides of the through hole 6031 , and the upper ends of the two movable columns 605 are movably passed through the movable hole 1041 of the middle plate 104 to the upper side of the middle plate 104 ;

[0080] Two buffer springs 606 are respectively mounted on the two movable columns 605;

[0081] Two limit blocks 607 are fixedly arranged at the upper ends of the two movable columns 605 respectively, and the size of each limit block 607 is larger than the aperture of the movable hole 1041 of the middle plate 104; the limit block 607 can prevent the movable column 605 from falling when the straight rod 601 is removed.

[0082] When the top surface of the lower auxiliary measuring plate 50 maintains non-compression contact with the central bottom surface of the main body of the composite material automobile leaf spring 90, the two buffer springs 606 are in a compressed state.

[0083] During the process of the straight rod 601 rotating and rising, the disc 603 is also moved upward, and the two sliding columns 604 respectively slide in the sliding groove 10511 of the extension part 1051. The two movable columns 605 also move upward, and the two buffer springs 606 are compressed. The two buffer springs 606 can prevent the straight rod 601 from rotating to a large extent at one time, so that the lower auxiliary measuring plate 50 is squeezed and contacted with the central bottom surface of the main body of the composite material automobile leaf spring 90, thereby increasing the height of the central bottom surface of the composite material automobile leaf spring 90, affecting the accuracy of the arc height measurement of the composite material automobile leaf spring 90.

[0084] The ruler 70 is arranged vertically.

[0085] The second driving device 80 is disposed on the support frame 10 and connected to the ruler 70, and the second driving device 80 is used to move the ruler 70 up and down in the vertical direction;

[0086] like Figure 6 As shown, in one embodiment, the second driving device 80 includes: a vertical seat 801 , a vertical screw rod 803 , a vertical nut 804 and a clamping seat 805 .

[0087] A vertical seat 801 having a vertical slide rail extending in the vertical direction, and the vertical seat 801 is fixedly disposed on the top plate 102;

[0088] The vertical motor 802 is fixedly arranged on the vertical seat 801, the vertical screw rod 803 is arranged vertically and one end of the vertical screw rod 803 is connected to the output end of the vertical motor 802, and the vertical nut 804 is sleeved on the vertical screw rod 803, so that the vertical nut 804 and the vertical screw rod 803 form a vertical screw rod 803 transmission connection; the clamping seat 805 is fixedly connected to the front side of the vertical nut 804 and is slidably connected to the vertical slide rail on the vertical seat 801, and the clamping seat 805 clamps the ruler 70 in a fixed state;

[0089] The vertical screw rod 803 rotates under the drive of the vertical motor 802, so that the vertical nut 804 moves linearly on the vertical screw rod 803 along the rod length direction of the vertical screw rod 803, thereby driving the clamping seat 805 and the ruler 70 on the clamping seat 805 to move up and down.

[0090] In one embodiment, the clamping seat 805 includes:

[0091] Two clamping blocks 8052 are connected by a screw 8051 , and a clamping groove 8053 for clamping and fixing the ruler 70 is provided between the two clamping blocks 8052 .

[0092] When the height of the composite automobile leaf spring 90 is tested, the suspension fixing mechanism 20 suspends and fixes the composite automobile leaf spring 90 on the support frame 10, and the lower auxiliary measuring plate 50 is driven by the first driving device 60 to move upward until the top surface of the lower auxiliary measuring plate 50 maintains non-extrusion contact with the central bottom surface of the main body of the composite automobile leaf spring 90, and the ruler 70 is driven by the second driving device 80 to move downward until the lower end of the ruler 70 contacts the top surface of the lower auxiliary measuring plate 50. At this time, the back of the ruler 70 contacts the upper auxiliary measuring plate 30 and the front of the upper buckle plate of the composite automobile leaf spring 90.

[0093] The detection device of the composite material automobile leaf spring adopts the method of setting an upper auxiliary measuring plate 30 at the center line 40 between the two end ears of the composite material automobile leaf spring 90; using the top surface of the lower auxiliary measuring plate 50 to maintain non-extrusion contact with the central bottom surface of the main body of the composite material automobile leaf spring 90, so that the center of the top surface of the upper buckle plate in the arc-shaped body of the composite material automobile leaf spring 90 is translated to a certain distance above the lower auxiliary measuring plate 50, and the upper auxiliary measuring plate 30 and the lower auxiliary measuring plate 50 together form an auxiliary measuring object with a stable position and convenient for the ruler 70 to quickly measure. Because the back of the ruler 70 is in contact with the upper auxiliary measuring plate 30 and the front of the upper buckle plate of the composite material automobile leaf spring 90, the risk of a large reading error caused by the distance between the ruler 70 and the measured object is reduced. The measurement area of ​​the ruler 70 includes the area between the top surface of the lower auxiliary measuring plate 50 and the upper auxiliary measuring plate 30, and can also be measured by the upper auxiliary measuring plate and the lower auxiliary measuring plate of the ruler. The distance between the plates is measured, and then the distance between the bottom surface of the composite material automobile leaf spring arc body and the top surface of the buckle plate is subtracted from the distance to obtain the arc height of the composite material automobile leaf spring; furthermore, the upper auxiliary measuring plate 30, the lower auxiliary measuring plate 50 and the ruler 70 adopted by the detection device of the composite material automobile leaf spring, in the whole arc height detection process of the composite material automobile leaf spring 90, based on the suspension fixing mechanism 20, the first driving device 60 and the second driving device 80 to maintain the structure and position stability, solves the problem that the inner sides of the ears at both ends of the composite material automobile leaf spring are not flat, and it is difficult to ensure that the end of the thin wire is always flush with the center of the ear when buckled with the ear, the flatness of the pad or the buckle plate on the arc body of the composite material automobile leaf spring cannot be guaranteed, which makes it difficult to use a ruler to directly measure, and the holding of the ruler, thin wire and other tools during manual detection is unstable, so the data error of the manually measured arc height detection of the composite material automobile leaf spring is large.

[0094] The technical means disclosed in the solution of the present invention are not limited to the technical means disclosed in the above technical means, but also include technical solutions composed of equivalent replacement of the above technical features. Matters not covered in the present invention belong to the common knowledge of those skilled in the art.

Claims

1. A detection device for composite material automobile leaf spring, characterized in that: include: A support frame (10), the support frame (10) comprising: a base (101); a top plate (102), which is located above the base (101); two support columns (103), both of which are arranged vertically and are used to connect the base (101) and the top plate (102); an intermediate plate (104), which is horizontally arranged between the two support columns (103), and both sides of the center of the intermediate plate (104) have movable holes (1041); a threaded barrel (105), which has threads on its inner side wall and is arranged vertically, and the lower end of the threaded barrel (105) has an extension portion (1051) extending vertically downward, and the extension portion (1051) has a sliding groove (10511), and the threaded barrel (105) is fixedly arranged at the center of the intermediate plate (104); A suspension fixing mechanism (20) suspended on the support frame (10), the suspension fixing mechanism (20) being used to suspend and fix a composite material automobile leaf spring (90) on the support frame (10); An upper auxiliary measuring plate (30) is horizontally fixed on the suspension fixing mechanism (20) and its bottom surface is kept flush with a center line (40) between the two end ears of the composite material automobile leaf spring (90); A lower auxiliary measuring plate (50) arranged horizontally; a first driving device (60), which is arranged on the support frame (10) and connected to the lower auxiliary measurement plate (50), the first driving device (60) being used to move the lower auxiliary measurement plate (50) up and down in a vertical direction; when the first driving device (60) is in a stationary state, the first driving device (60) and the support frame (10) are in a locked state; a ruler (70) arranged vertically; a second driving device (80), which is arranged on the support frame (10) and connected to the ruler (70), and the second driving device (80) is used to move the ruler (70) up and down in a vertical direction; When the height of the composite automobile leaf spring (90) is detected, the suspension fixing mechanism (20) suspends and fixes the composite automobile leaf spring (90) on the support frame (10); the lower auxiliary measuring plate (50) is driven by the first driving device (60) to move upward until the top surface of the lower auxiliary measuring plate (50) is in non-compressive contact with the central bottom surface of the main body of the composite automobile leaf spring (90); the ruler (70) is driven by the second driving device (80) to move downward until the lower end of the ruler (70) is in contact with the top surface of the lower auxiliary measuring plate (50); at this time, the back side of the ruler (70) is in contact with the upper auxiliary measuring plate (30) and the front side of the composite automobile leaf spring (90); the first driving device (60) comprises: The straight rod (601) has a thread on its upper outer surface that matches the thread on the inner wall of the threaded barrel (105) and a smooth outer surface on its lower outer surface. The upper end of the straight rod (601) is fixedly connected to the bottom surface of the lower measurement auxiliary plate. The second driving device (80) comprises: A vertical seat (801) having a vertical slide rail extending in the vertical direction, wherein the vertical seat (801) is fixedly arranged on the top plate (102); A vertical motor (802) fixedly mounted on the vertical seat (801); A vertical screw rod (803) is arranged vertically and one end of the vertical screw rod is connected to the output end of the vertical motor (802); A vertical nut (804) is sleeved on the vertical screw rod (803), so that the vertical nut (804) and the vertical screw rod (803) form a vertical screw rod (803) transmission connection; The clamping seat (805) is fixedly connected to the front side of the vertical nut (804) and is slidably connected to the vertical slide rail on the vertical seat (801). The clamping seat (805) holds the ruler (70) in a clamped and fixed state. The vertical screw rod (803) is driven by the vertical motor (802) to rotate, so that the vertical nut (804) moves linearly along the length direction of the vertical screw rod (803) on the vertical screw rod (803), thereby driving the clamping seat (805) and the ruler (70) on the clamping seat (805) to move up and down.

2. The detection device for composite material automobile leaf spring according to claim 1, characterized in that: The first driving device (60) further comprises: A hand-held portion (602) is fixedly connected to the lower end of the straight rod (601).

3. The detection device for composite material automobile leaf spring according to claim 2, characterized in that: The first driving device (60) further comprises: A disc-shaped member (603) having a through hole (6031) in the middle thereof for the straight rod member (601) to pass through, and the bottom surface of the disc-shaped member (603) is in contact with the top surface of the hand-held portion (602); Two sliding posts (604), which are respectively fixedly arranged on the disk-shaped member (603) and located on both sides of the through hole (6031), and the two sliding posts (604) are arranged vertically upward and slide in cooperation with the sliding groove (10511) of the extension portion (1051); Two movable columns (605), the lower ends of which are respectively fixedly arranged on the disk-shaped member (603) and located on both sides of the through hole (6031), and the upper ends of the two movable columns (605) are movably passed through the movable hole (1041) of the middle plate (104) to the top of the middle plate (104); Two buffer springs (606), which are respectively sleeved on the two movable columns (605); Two limit blocks (607) are respectively fixedly arranged on the upper ends of the two movable columns (605), and the size of each limit block (607) is larger than the aperture of the movable hole (1041) of the middle plate (104); When the top surface of the lower auxiliary measurement plate (50) maintains non-compression contact with the central bottom surface of the main body of the composite material automobile leaf spring (90), the two buffer springs (606) are in a compressed state.

4. The detection device for composite material automobile leaf spring according to claim 3, characterized in that: The suspension fixing mechanism (20) comprises: Two hanging rods (201), both upper ends of which are fixed on the top plate (102); Two embedded columns (202), the rear ends of which are respectively fixedly connected to the lower ends of the two hanging rods (201), and the two embedded columns (202) have threads on the outer surfaces of the front ends; Two sets (203), which are respectively sleeved on the front ends of the two embedded columns (202), and the upper auxiliary measurement plate (30) is connected between the two sets (203); Two fixing collars (204), both of which are sleeved on the front end of the embedded column (202) and have threads on the inner side walls thereof that match the threads on the front end of the embedded column (202); When the height of the composite material automobile leaf spring (90) is detected, the front ends of the two embedded columns (202) pass through corresponding ears on the composite material automobile leaf spring (90), and the ears on the composite material automobile leaf spring (90) are fixed to the embedded columns (202) by screwing in and extruding the fixing ring (204).

5. The detection device for composite material automobile leaf spring according to claim 4, characterized in that: The clamping seat (805) comprises: Two clamping blocks (8052) are connected by a screw rod (8051), and a clamping groove (8053) for clamping and fixing the ruler (70) is provided between the two clamping blocks (8052).

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