Detection device for cylindricity, straightness and roundness of VGR rack

Abstract

The utility model discloses a device for detecting cylindricity, straightness and roundness of a VGR rack, and the device comprises a dial indicator, a bottom plate, a sliding control mechanism which is fixedly disposed on the bottom plate, a limiting mechanism, and a moving mechanism. The detection tool is short in assembly process and low in manufacturing cost, compared with three-coordinate and contourgraph precision detection tools, the detection tool is low in professional requirement for operators, easy to operate, capable of efficiently and rapidly screening products produced in a large scale, low in manufacturing cost, high in detection efficiency and high in detection efficiency, and the detection tool is suitable for large-scale production. The method is suitable for batch production and application and popularization.

Description

Technical Field

[0001] The utility model relates to the field of inspection equipment characterized by adopting a mechanical method, in particular to a device for detecting the cylindricity, straightness and roundness of a VGR rack. Background Art

[0002] With the development of emerging technologies, variable transmission ratio steering gears have been widely used abroad and are gradually being used in China. Traditional gear racks have a constant transmission ratio and the teeth are equidistant, which is called CGR racks. They are generally manufactured by cutting methods such as tooth drawing or milling. The rack pitch changes according to the transmission ratio curve, which is called a variable speed ratio rack or VGR rack. VGR rack is a steering system that combines a rack and a pinion. It has different gear ratios at the center and both ends of the rack. This rack with a variable speed ratio is mostly used in automobile steering systems. The variable speed ratio steering system is different from the traditional gear rack steering system. The rack on the steering linkage on the traditional gear rack steering system is uniformly dense, while the VGR rack achieves different speed ratios by adjusting the tooth profile parameters. Therefore, the VGR rack variable speed ratio tooth surface presents a curved surface.

[0003] The VGR rack processing methods in the prior art are generally organic machining and forging. Organic machining uses high-speed milling or five-axis precision carving. The machining efficiency during forging is low and the precision is high; forging has high efficiency but will cause deformation of the workpiece.

[0004] At present, the traditional detection methods for VGR racks in the market mainly use three-coordinate detection and V-blocks with height gauges to detect the cylindricity, straightness and roundness of VGR racks. However, due to the high cost of three-coordinate detection, high professional requirements for detection personnel, complex detection process, difficult operation, high detection cost and other problems, VGR racks are not conducive to mass production detection. If V-blocks are used with height gauges, it is difficult to achieve high accuracy and it is not shock-resistant. If there is a step at the end of the workpiece, it is difficult to measure.

[0005] For example, Chinese patent CN 114061401 A discloses a method for detecting the tooth height of a straight tooth face tooth: measuring the center height h1 of the face tooth of the gauge; measuring the axial height H3 at the outer circle of the tooth top after the face tooth top of the workpiece is fine-turned; calculating the theoretical center height h3 of the face tooth of the workpiece; after the face tooth of the workpiece is machined, meshing the gauge with the workpiece, measuring the distance H2 between the bottom surface of the gauge and the reference surface of the workpiece; calculating the actual center height h3' of the face tooth of the workpiece, comparing the actual value h3' of the center height of the tooth with the theoretical center height h3, and if it is within the allowable tolerance range, it is considered that the tooth height meets the requirements, and the actual center height h3' is the face tooth tooth height. This method uses the geometric relationship after the workpiece and the gauge mesh, the relationship between the associated dimensions of the workpiece and the parameters of the face tooth to obtain the actual tooth height of the face tooth on the workpiece. It can be seen from this that although this detection method can detect the relationship between the associated dimensions of the workpiece and the parameters of the face teeth, this is detected in the case of spur face teeth. Since the VGR rack has different gear ratios at the center and both ends of the rack, this method cannot detect racks with different speed ratios achieved by adjusting the tooth profile parameters, and it is even more unable to detect the cylindricity, straightness and roundness of the VGR rack. Utility Model Content

[0006] Purpose of the utility model: In order to solve the deficiencies of the prior art, the utility model provides a device for detecting the cylindricity, straightness and roundness of a VGR rack. The inspection tool can simultaneously detect the cylindricity, straightness and roundness of a VGR rack, and is quick to use and efficient for rapid screening of mass-produced products.

[0007] Technical solution: In order to achieve the above objectives, the utility model provides a device for detecting the cylindricity, straightness and roundness of a VGR rack, which comprises: a dial indicator, a base plate, a sliding control mechanism, a limiting mechanism and a moving mechanism fixed to the base plate, wherein the sliding control mechanism is used to support the limiting mechanism to install the workpiece, and the moving mechanism is used to install the dial indicator and detect the cylindricity, straightness and roundness of the workpiece.

[0008] As a further preferred embodiment of the utility model, the moving mechanism includes: a lever dial indicator bracket, a lever dial indicator base, a slider B and a guide rail A. The guide rail A is fixed on the surface of the base plate and is parallel to the installation direction of the workpiece. The lower end of the lever dial indicator bracket is installed on the lever dial indicator base and slides linearly on the guide rail A through the slider B. The dial indicator is installed on the upper end of the lever dial indicator bracket.

[0009] As a further preference of the present invention, the hinge provided on the lever dial indicator bracket enables the lever dial indicator bracket to be telescopic and foldable. This technical feature is a prior art and has been widely used in the prior art. Products involving the working principle of this technical feature include telescopic clothes hangers and remote-controlled telescopic track doors. Therefore, the specific structure of this feature will not be described in detail here.

[0010] As a further preferred embodiment of the present invention, the limiting mechanism comprises: a positioning end external thread bearing base, a positioning end external thread bearing base pad, a screw end sleeve, a screw end external thread bearing, a screw balance connecting plate, a screw end external thread bearing base, a positioning end sleeve and a positioning end external thread bearing;

[0011] The positioning end external thread bearing base pad is fixed on the bottom plate, the positioning end external thread bearing base is installed above the positioning end external thread bearing base pad, and the positioning end sleeve is installed on the positioning end external thread bearing base through the positioning end external thread bearing;

[0012] The screw end sleeve is fixed on the screw end external bearing base through the screw end external bearing, the screw end external bearing base is installed above the screw balance connecting plate, and the screw balance connecting plate is fastened to the sliding control mechanism.

[0013] As a further preferred embodiment of the present invention, a workpiece is installed between the screw end sleeve and the positioning end sleeve.

[0014] As a further preferred embodiment of the present invention, the screw end sleeve and the positioning end sleeve are respectively provided with limiting holes with tapered surfaces for mounting workpieces.

[0015] As a further preferred embodiment of the present invention, the angle of the conical surface of the limiting hole is 8° to 15°. The conical surface provided in the screw end sleeve and the positioning end sleeve can play a guiding role when installing the workpiece. At the same time, due to the conical surface provided in the limiting hole, the radial position of the workpiece can be limited after the two ends of the workpiece are respectively installed in the screw end sleeve and the positioning end sleeve, so that the workpiece is not prone to radial rotation during static installation.

[0016] As a further preferred embodiment of the present invention, the sliding control mechanism comprises: a connecting plate pad A, a slider A, a slider C, a connecting plate pad B, a screw nut seat, a screw hand crank wheel, a screw fixing block, a guide rail B, a screw and a screw support block;

[0017] The connecting plate pad A and the connecting plate pad B are respectively located on both sides of the screw nut seat and fixedly arranged below the screw balance connecting plate. The lower part of the connecting plate pad A is connected to the guide rail A through the slider A, and the lower part of the connecting plate pad B is connected to the guide rail B through the slider C. The guide rail B is fixedly arranged on the bottom plate and arranged parallel to the guide rail A.

[0018] One end of the screw is fixedly connected to the screw hand crank wheel, and the other end of the screw passes through the screw fixing block and the screw nut seat in sequence and is fixedly connected to the screw support block. The screw fixing block and the screw support block are fixedly arranged on the bottom plate.

[0019] As a further preferred embodiment of the present invention, the screw rod hand crank wheel is turned to drive the screw rod to rotate, so that the screw rod nut seat provided on the screw rod moves linearly on the screw rod, thereby driving the screw rod balancing connecting plate installed above the screw rod nut seat to move linearly on the guide rails B and A. The screw rod nut seat is located in the middle of the slider A and the slider C, the screw rod nut seat moves linearly on the screw rod, the sliders A and the slider C located on both sides of the screw rod nut seat move linearly on the guide rails A and B respectively, and the guide rails A, B and the screw rod are arranged in parallel, thereby ensuring that the screw rod balancing connecting plate located above the screw rod nut seat can achieve horizontal linear movement.

[0020] As a further optimization of the present invention, the screw hand-cranked wheel is provided with a screw self-locking bolt. The screw hand-cranked wheel and the screw self-locking bolt are prior art. The overall structure model of the screw support block, the screw, the screw nut, the nut seat, the screw fixing block, the screw self-locking bolt and the screw hand-cranked wheel is 1605. The supplier is Yisheng Group. After purchasing, the screw support block and the screw fixing block can be directly fixed to the base plate with bolts. The self-locking function of the screw self-locking bolt on the screw hand-cranked wheel is a built-in function of the structure.

[0021] Beneficial effects: Compared with the prior art, the device for detecting the cylindricity, straightness and roundness of a VGR rack described in the utility model has very few inspection fixture components. The same device can simultaneously detect the cylindricity, straightness and roundness of the VGR rack. The assembly process is very short and the cost is low. Compared with three-coordinate and profiler precision inspection fixtures, the professional requirements for operators are low and the operation is simple. It can efficiently and quickly screen mass-produced products. The inspection fixture cost is low and is suitable for mass production and application promotion. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 This is a schematic diagram of the structure of the utility model after the workpiece is installed Figure 1 ;

[0023] Figure 2 This is a schematic diagram of the structure of the utility model after the workpiece is installed Figure 2 ;

[0024] Figure 3 A full cross-sectional view of the screw end sleeve. DETAILED DESCRIPTION

[0025] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.

[0026] As shown in the accompanying drawings, a device for detecting the cylindricity, straightness and roundness of a VGR rack described in the utility model comprises: a lever dial indicator bracket 1, a digital dial indicator 2, a positioning end external bearing base 3, a positioning end external bearing base pad 4, a bottom plate 5, a screw end sleeve 6, a screw end external bearing 7, a screw balance connecting plate 8, a connecting plate pad A9, a slider A10, a slider C11, a connecting plate pad B12, a screw nut seat 13, a screw hand crank wheel 14, a screw self-locking bolt 15, a screw fixing block 16, a screw end external bearing base 17, a guide rail B18, a screw 19, a screw support block 20, a lever dial indicator base 21, a slider B22, a guide rail A24, a positioning end sleeve 25, a positioning end external bearing 26 and a foot 27.

[0027] The guide rail A24 is fixed on the surface of the base plate 5 and is parallel to the installation direction of the workpiece 23. The lower end of the lever dial indicator bracket 1 is installed on the lever dial indicator base 21 and then slides linearly on the guide rail A24 through the slider B22. The dial indicator 2 is installed on the upper end of the lever dial indicator bracket 1. The hinge on the lever dial indicator bracket 1 makes the lever dial indicator bracket 1 retractable and foldable.

[0028] The positioning end external thread bearing base pad 4 is fixed on the base plate 5, the positioning end external thread bearing base 3 is installed above the positioning end external thread bearing base pad 4, the positioning end sleeve 25 is installed on the positioning end external thread bearing base 3 through the positioning end external thread bearing 26, the screw end sleeve 6 is fixed on the screw end external thread bearing base 17 through the screw end external thread bearing 7, the screw end external thread bearing base 17 is installed above the screw balance connecting plate 8, the screw balance connecting plate 8 is fastened to the sliding control mechanism, the workpiece 23 is installed between the screw end sleeve 6 and the positioning end sleeve 25, and the screw end sleeve 6 and the positioning end sleeve 25 are respectively provided with a limit hole 61 with a cone surface of 8°~15° for installing the workpiece 23.

[0029] The connecting plate pad A9 and the connecting plate pad B12 are respectively located on both sides of the screw nut seat 13 and fixedly arranged below the screw balancing connecting plate 8. The lower part of the connecting plate pad A9 is connected to the guide rail A24 through the slider A10, and the lower part of the connecting plate pad B12 is connected to the guide rail B18 through the slider C11. The guide rail B18 is fixedly arranged on the bottom plate 5 and is arranged parallel to the guide rail A24.

[0030] One end of the screw rod 19 is fixedly connected to the screw rod hand crank wheel 14, and the other end of the screw rod 19 passes through the screw rod fixing block 16 and the screw rod nut seat 13 in sequence and is fixedly connected to the screw rod support block 20. The screw rod fixing block 16 and the screw rod support block 20 are fixedly mounted on the base plate 5. Manual rotation of the screw rod hand crank wheel 14 drives the screw rod 19 to rotate, so that the screw rod nut seat 13 passed through the screw rod 19 moves linearly on the screw rod 19, thereby driving the screw rod balancing connecting plate 8 installed above the screw rod nut seat 13 to move linearly on the guide rails B18 and A24.

[0031] Example 1

[0032] When testing the cylindricity of workpiece 23:

[0033] Step 1: first lift the lever dial indicator bracket 1 equipped with the digital display dial indicator 2, and then insert the left side of the workpiece 23 into the positioning end sleeve 25;

[0034] Step 2: Shake the screw hand crank wheel 14 to make the screw end sleeve 6 bear against the right side of the workpiece 23. At this time, both ends of the workpiece 23 are respectively clamped into the limiting holes 61;

[0035] Step 3: Manually turn the screw self-locking bolt 15 to achieve self-locking of the screw hand crank wheel 14. At this time, the workpiece 23 is fixed between the positioning end sleeve 25 and the screw end sleeve 6;

[0036] Step 4. Lower the lever dial gauge bracket 1 equipped with the digital dial gauge 2 to contact the workpiece 23, then manually slowly rotate the workpiece 23 one circle, first measure one circle of data with the dial gauge 2, then slowly move the slider B22 equipped with the lever dial gauge bracket 1 to one side, stop moving after the moving distance is 1 / 5 of the total length, then manually turn the workpiece 23 one circle, then slowly move the lever dial gauge bracket 1 equipped with the digital dial gauge 2 to the next measurement point with a distance of 1 / 5 of the total length, continue to measure one circle, and repeat the above steps until the measurement is completed. When the dial gauge 2 detects the data, the workpiece 23 is always rotating slowly and uniformly. The digital dial gauge 2 is always connected to the computer's data acquisition software during the measurement to check the data fluctuations, thereby obtaining the cylindrical tolerance.

[0037] Example 2

[0038] When inspecting the straightness of the workpiece 23

[0039] Step 1: first lift the lever dial indicator bracket 1 equipped with the digital display dial indicator 2, and then insert the left side of the workpiece 23 into the positioning end sleeve 25;

[0040] Step 2: Shake the screw hand crank wheel 14 to make the screw end sleeve 6 bear against the right side of the workpiece 23. At this time, both ends of the workpiece 23 are respectively clamped into the limiting holes 61;

[0041] Step 3: Manually turn the screw self-locking bolt 15 to achieve self-locking of the screw hand crank wheel 14. At this time, the workpiece 23 is fixed between the positioning end sleeve 25 and the screw end sleeve 6;

[0042] Step 4. Lower the lever dial indicator bracket 1 equipped with the digital dial indicator 2 to contact the workpiece 23. Manually push the lever dial indicator bracket 1 to make the slider B22 move slowly in a straight line, and stop after moving to a specified distance. The digital dial indicator 2 is always connected to the computer's data acquisition software during the measurement, and then check the data fluctuations to obtain the straightness tolerance.

[0043] Example 3

[0044] When detecting the roundness of the workpiece 23

[0045] Step 1: first lift the lever dial indicator bracket 1 equipped with the digital display dial indicator 2, and then insert the left side of the workpiece 23 into the positioning end sleeve 25;

[0046] Step 2: Shake the screw hand crank wheel 14 to make the screw end sleeve 6 bear against the right side of the workpiece 23. At this time, both ends of the workpiece 23 are respectively clamped into the limiting holes 61;

[0047] Step 3: Manually turn the screw self-locking bolt 15 to achieve self-locking of the screw hand crank wheel 14. At this time, the workpiece 23 is fixed between the positioning end sleeve 25 and the screw end sleeve 6;

[0048] Step 4: Lower the lever dial indicator bracket 1 equipped with the digital dial indicator 2 to contact the workpiece 23, and then manually slowly rotate the workpiece 23 for measurement. The digital dial indicator 2 is always connected to the computer's data acquisition software during the measurement to check the data fluctuations and obtain the roundness tolerance.

[0049] The above implementation is only to illustrate the technical concept and features of the utility model, and its purpose is to enable technicians familiar with the technical field to understand the content of the utility model and implement it accordingly, and it cannot be used to limit the protection scope of the utility model. Any equivalent changes or modifications made according to the spirit of the utility model should be included in the protection scope of the utility model.

Claims

1. A device for detecting the cylindricity, straightness and roundness of a VGR rack, comprising: The dial indicator (2) is characterized in that it also includes: a base plate (5), a sliding control mechanism, a limiting mechanism and a moving mechanism fixed on the base plate (5), wherein the sliding control mechanism is used to support the limiting mechanism to install the workpiece (23), and the moving mechanism is used to install the dial indicator (2) and detect the cylindricity, straightness and roundness of the workpiece (23).

2. A VGR rack cylindricity, straightness and roundness detection device according to claim 1, characterized in that: The moving mechanism comprises: a lever dial indicator bracket (1), a lever dial indicator base (21), a slider B (22) and a guide rail A (24); the guide rail A (24) is fixed on the surface of the base plate (5) and is parallel to the installation direction of the workpiece (23); the lower end of the lever dial indicator bracket (1) is mounted on the lever dial indicator base (21) and slides linearly on the guide rail A (24) through the slider B (22); the dial indicator (2) is mounted on the upper end of the lever dial indicator bracket (1).

3. A VGR rack cylindricity, straightness and roundness detection device according to claim 2, characterized in that: The hinge provided on the lever dial indicator bracket (1) enables the lever dial indicator bracket (1) to be telescopic and foldable.

4. A VGR rack cylindricity, straightness and roundness detection device according to claim 1, characterized in that: The limiting mechanism comprises: a positioning end external thread bearing base (3), a positioning end external thread bearing base pad (4), a screw end sleeve (6), a screw end external thread bearing (7), a screw balance connecting plate (8), a screw end external thread bearing base (17), a positioning end sleeve (25) and a positioning end external thread bearing (26); The positioning end external thread bearing base pad (4) is fixed on the bottom plate (5), the positioning end external thread bearing base (3) is installed above the positioning end external thread bearing base pad (4), and the positioning end sleeve (25) is installed on the positioning end external thread bearing base (3) through the positioning end external thread bearing (26); The screw end sleeve (6) is fixed on the screw end external bearing base (17) through the screw end external bearing (7), and the screw end external bearing base (17) is installed above the screw balance connecting plate (8), and the screw balance connecting plate (8) is fastened to the sliding control mechanism.

5. A VGR rack cylindricity, straightness and roundness detection device according to claim 4, characterized in that: A workpiece (23) is installed between the screw end sleeve (6) and the positioning end sleeve (25).

6. A VGR rack cylindricity, straightness and roundness detection device according to claim 4, characterized in that: The screw end sleeve (6) and the positioning end sleeve (25) are respectively provided with a limiting hole (61) with a conical surface for mounting a workpiece (23).

7. A VGR rack cylindricity, straightness and roundness detection device according to claim 6, characterized in that: The cone angle of the limiting hole (61) is 8° to 15°.

8. The device for detecting the cylindricity, straightness and roundness of a VGR rack according to claim 1, characterized in that: The sliding control mechanism comprises: a connecting plate pad A (9), a slider A (10), a slider C (11), a connecting plate pad B (12), a screw nut seat (13), a screw hand crank wheel (14), a screw fixing block (16), a guide rail B (18), a screw (19) and a screw support block (20); The connecting plate pad A (9) and the connecting plate pad B (12) are respectively located on both sides of the screw nut seat (13) and fixedly arranged below the screw balancing connecting plate (8); the lower part of the connecting plate pad A (9) is connected to the guide rail A (24) via a slider A (10); the lower part of the connecting plate pad B (12) is connected to the guide rail B (18) via a slider C (11); the guide rail B (18) is fixedly arranged on the bottom plate (5) and arranged parallel to the guide rail A (24); One end of the screw rod (19) is fixedly connected to the screw rod hand crank wheel (14), and the other end of the screw rod (19) passes through the screw rod fixing block (16) and the screw rod nut seat (13) in sequence and is fixedly connected to the screw rod support block (20). The screw rod fixing block (16) and the screw rod support block (20) are fixedly arranged on the bottom plate (5).

9. A VGR rack cylindricity, straightness and roundness detection device according to claim 8, characterized in that: The screw rod hand crank wheel (14) is rotated to drive the screw rod (19) to rotate, so that the screw rod nut seat (13) inserted on the screw rod (19) moves linearly on the screw rod (19), thereby driving the screw rod balancing connecting plate (8) installed above the screw rod nut seat (13) to move linearly on the guide rail B (18) and the guide rail A (24).

10. A device for detecting the cylindricity, straightness and roundness of a VGR rack according to claim 8, characterized in that: The screw rod hand-cranked wheel (14) is provided with a screw rod self-locking bolt (15).

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