A cylindrical helical spring outer diameter gauge

Abstract

This utility model relates to the field of mechanical manufacturing and precision measurement technology, and in particular to a cylindrical helical spring outer diameter gauge. It includes a base, a clamping assembly mounted on the base, a movable plate slidably connected to the base, a controller mounted on the movable plate, a connecting frame connected to the top of the movable plate facing the clamping assembly, a guide rod connected inside the connecting frame, a mounting frame slidably connected inside the connecting frame, a contact block slidably connected inside the mounting frame, the contact block being slidably connected to the guide rod, a fastening screw threaded to the lower end of the mounting frame, the rear end of the fastening screw engaging with the contact block, and a rangefinder mounted on the top of the contact block, the rangefinder being wiredly connected to the controller. The guide rod and mounting frame together restrict the sliding direction of the contact block, ensuring it can only move vertically. The curved surface structure of the adapter plate further eliminates the interference of the spring surface curvature on the measurement, significantly improving the stability of the data detected by the rangefinder and achieving the goal of improving detection accuracy.

Description

Technical Field

[0001] This utility model relates to the field of mechanical manufacturing and precision measurement technology, and in particular to a cylindrical helical spring outer diameter gauge. Background Technology

[0002] As a widely used elastic element in mechanical systems, the outer diameter of cylindrical helical springs is a key parameter affecting assembly accuracy, load characteristics, and service life. Rapid and accurate measurement of the outer diameter is crucial for ensuring product performance during spring manufacturing and quality inspection. However, due to the cylindrical helical structure of the spring, outer diameter measurement is easily affected by factors such as elastic deformation and surface curvature, making it difficult for traditional contact measuring tools to achieve efficient and stable non-destructive testing.

[0003] In the prior art, there has been some exploration of dedicated gauges for the outer diameter of cylindrical helical springs. One such gauge, with publication number CN222799890U, comprises an arc-shaped positioning plate and an axially sliding movable column. During measurement, the spring is fitted onto the arc-shaped plate, and the spring is compressed by pressing down on the movable column. The outer diameter value is then read using scale lines on the movable column. This design simplifies the measurement process to some extent by constraining the axial deformation direction of the spring.

[0004] However, because the spring generates a reverse elastic force when compressed, this force acts directly on the movable column through the spring body, which may cause slight displacement or vibration of the movable column during measurement. Although operators can reduce the impact by taking quick readings, factors such as the frictional resistance of the mechanical structure itself and differences in operating force can still introduce measurement errors, resulting in insufficient stability and repeatability of the scale readings, making it difficult to meet the requirements of high-precision testing. Utility Model Content

[0005] To overcome the drawback of poor indication stability caused by reaction force interference, this utility model provides a gauge for accurate detection of the outer diameter of a cylindrical helical spring.

[0006] A cylindrical helical spring outer diameter gauge includes a base, on which a clamping assembly for fitting the cylindrical spring is mounted. A movable plate is slidably connected to the base, and a controller is mounted on the movable plate. A connecting frame is connected to the top of the movable plate facing the clamping assembly. A guide rod is connected inside the connecting frame. A mounting frame is slidably connected inside the connecting frame. A contact block is slidably connected inside the mounting frame and is slidably connected to the guide rod. A fastening screw is threaded to the lower end of the mounting frame, and the rear end of the fastening screw is pressed against the contact block. A rangefinder is mounted on the top of the contact block, and the rangefinder is wiredly connected to the controller.

[0007] Furthermore, a fixed seat is connected to the front side of the upper end of the contact block, a rotating rod is rotatably connected to the front end of the fixed seat, the fixed seat is slidably connected to the front side of the mounting frame, a top block is connected to the front top of the mounting frame, and the rotating rod is limited in cooperation with the top block.

[0008] Furthermore, a counterweight is connected to the top of the contact block, and the rangefinder is located on top of the counterweight.

[0009] Furthermore, an auxiliary rod is connected to the front side of the contact block, the auxiliary rod is slidably connected to the front side of the mounting bracket, and the auxiliary rod is located below the fixed base.

[0010] Furthermore, a rubber pad is connected to the rear side of the fastening screw, and the rubber pad is pressed and engaged with the contact block.

[0011] Furthermore, an adapter plate is provided at the bottom of the contact block, and the bottom of the adapter plate contacts the cylindrical spring.

[0012] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0013] By using guide rods and mounting brackets to restrict the sliding direction of the contact block, ensuring that it can only move in the vertical direction, the contact between the adapter plate and the spring is guaranteed to be perpendicular. The arc surface structure of the adapter plate further eliminates the interference of the spring surface curvature on the measurement, significantly improving the stability of the data detected by the rangefinder and achieving the goal of improving the accuracy of the detection. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the overall structure of this utility model.

[0015] Figure 2 This is a schematic diagram of the installation structure of the connecting frame and guide rod of this utility model.

[0016] Figure 3 This is a cross-sectional view showing the connection relationship between the auxiliary rod and the contact block of this utility model.

[0017] Figure 4 This is a schematic diagram showing the connection relationship between the fixed base and the rotating rod of this utility model.

[0018] Reference numerals: 1_base, 101_clamping assembly, 102_moving plate, 103_controller, 2_connecting bracket, 3_guide rod, 4_mounting bracket, 5_fastening screw, 6_contact block, 7_rangefinder, 8_fixed seat, 9_rotating rod, 10_top block, 11_counterweight block, 12_auxiliary rod, 13_rubber pad, 14_adapter plate. Detailed Implementation

[0019] The present invention will be described in detail below with reference to the accompanying drawings and specific embodiments, but this is not intended to limit the present invention.

[0020] Example: A gauge for the outer diameter of a cylindrical helical spring, such as Figures 1-4 As shown, the system includes a base 1, a clamping assembly 101, a movable plate 102, a controller 103, a connecting frame 2, a guide rod 3, a mounting bracket 4, a fastening screw 5, a contact block 6, and a rangefinder 7. A clamping assembly 101 for mounting cylindrical springs is installed on the right side of the base 1. The clamping assembly 101 can be adjusted to accommodate cylindrical springs of different outer diameters, ensuring that the axes coincide. The movable plate 102 is slidably connected to the base 1. A power assembly for driving the movable plate 102 to slide is installed inside the base 1. The movable plate 102 is mounted on... The device includes a controller 103. A connecting frame 2 is connected to the top of the movable plate 102 facing the clamping assembly 101. A guide rod 3 is connected inside the connecting frame 2. A mounting frame 4 is slidably connected inside the connecting frame 2. A contact block 6 is slidably connected inside the mounting frame 4. The contact block 6 is slidably connected to the guide rod 3. A fastening screw 5 is threadedly connected to the lower end of the mounting frame 4. The rear end of the fastening screw 5 is pressed against the contact block 6. A rangefinder 7 is installed on the top of the contact block 6. The rangefinder 7 is wiredly connected to the controller 103 to realize real-time data transmission and calculation.

[0021] like Figures 2-4 As shown, it also includes a fixed base 8, a rotating rod 9, and a top block 10. The fixed base 8 is connected to the front side of the upper end of the contact block 6. The rotating rod 9 is rotatably connected to the front end of the fixed base 8. The fixed base 8 is slidably connected to the front side of the mounting frame 4. The top block 10 is connected to the front top of the mounting frame 4. The rotating rod 9 and the top block 10 are in a limiting cooperation. The top block 10 supports the rotating rod 9, which simplifies the locking operation after the contact block 6 is reset and improves the ease of use.

[0022] like Figure 3 As shown, it also includes a counterweight 11. The counterweight 11 is connected to the top of the contact block 6. The rangefinder 7 is located on the top of the counterweight 11. The counterweight 11 increases the weight of the contact block 6. Combined with the friction adjustment of the fastening screw 5, the contact block 6 slides down at a stable rate.

[0023] like Figure 3 As shown, it also includes an auxiliary rod 12. The auxiliary rod 12 is connected to the front side of the contact block 6. The auxiliary rod 12 is slidably connected to the front side of the mounting bracket 4. The auxiliary rod 12 is located below the fixed base 8. The auxiliary rod 12 provides a gripping point for the up and down sliding of the contact block 6, simplifying the manual operation process.

[0024] like Figure 3 As shown, it also includes a rubber pad 13. The rubber pad 13 is connected to the rear side of the fastening screw 5. The rubber pad 13 is pressed and fitted with the contact block 6. The rubber pad 13 adjusts the friction with the contact block 6 through elastic deformation. When loosened, the friction is reduced to facilitate sliding down. When tightened, the friction is increased to fix the position.

[0025] like Figure 3 As shown, it also includes an adapter plate 14. The bottom of the contact block 6 is provided with an adapter plate 14. The bottom of the adapter plate 14 contacts the cylindrical spring. The adapter plate 14 can be replaced according to the spring wire diameter. Its bottom side is provided with a mating arc surface that fits with the spring surface to reduce measurement errors and ensure the accuracy of the outer diameter calculation.

[0026] When measuring the outer diameter of a cylindrical spring, the operator first places the cylindrical spring onto the clamping assembly 101, adjusts the clamping assembly 101 to fully expand the spring, and ensures that the axis of the clamping assembly 101 coincides with the axis of the spring, forming a stable measurement reference. Then, the power assembly inside the base 1 is activated, driving the moving plate 102 to translate towards the spring. When the left end of the moving plate 102 contacts the end face of the clamping assembly 101, the sliding state of the moving plate 102 is locked, fixing the starting position of the measurement.

[0027] To ensure contact between the contact block 6 and the spring surface, the operator loosens the fastening screw 5. The fastening screw 5 moves forward along the thread of the mounting bracket 4, reducing the pressure on the contact block 6 and thus decreasing the friction between the rubber pad 13 and the contact block 6. At this time, the contact block 6 slides downwards along the guide rod 3 and the mounting bracket 4. The guide rod 3 and the mounting bracket 4 together restrict the contact block 6 to move only vertically, preventing skewness. When the adapter plate 14 at the bottom of the contact block 6 contacts the spring surface, the distance measuring instrument 7 detects the distance from its top to the inner top of the mounting bracket 4, and calculates the outer diameter of the spring based on preset data.

[0028] To ensure measurement accuracy, the operator moves the mounting bracket 4 left and right, sliding it along the guide rod 3 so that the adapter plate 14 contacts different circumferential positions of the spring in sequence. This testing process is repeated, and multiple sets of data are collected and averaged. After the test is completed, the operator pinches the auxiliary rod 12 and pulls the contact block 6 upwards. The contact block 6 slides back to its high position along the guide rod 3 and the mounting bracket 4, and the fastening screws are tightened to clamp and fix the contact block 6. Then, the power assembly drives the moving plate 102 away from the spring, releasing the clamping force on the spring, allowing the spring to be removed and the measurement completed.

[0029] When the contact block 6 needs to be kept in a high position during idle, the rotating rod 9 contacts the top block 10, which, together with the fixed seat 8, restricts the downward sliding of the contact block 6, preventing it from falling accidentally due to gravity or vibration. When it is necessary to lower the contact block 6, the rotating rod 9 rotates to disengage from the contact block 6, and the operator loosens the fastening screw 5. The rubber pad 13 rebounds due to elastic deformation, reducing the friction with the contact block 6. The counterweight 11 increases the weight of the contact block 6. Combined with the adjustment of the tightening amplitude of the fastening screw 5, the contact block 6 slides down at an appropriate rate, avoiding collision between the adapter plate 14 and the spring surface. At the same time, the adapter plate 14 is replaced according to the spring wire diameter to ensure that its bottom mating arc surface fits the spring surface, improving contact stability.

[0030] When the contact block 6 needs to be reset after the test, the surveyor pinches the auxiliary rod 12 and the rotating rod 9 and pulls the contact block 6 upward. After pulling it to the top, the rotating rod 9 is rotated so that the bottom of the rotating rod 9 contacts the top block 10 again. The top block 10 supports the rotating rod 9 and restricts the contact block 6 from sliding down. Then, the fastening screw 5 is tightened. The rubber pad 13 undergoes elastic deformation, increasing the friction with the contact block 6. At the same time, the contact friction between the contact block 6 and the guide rod 3 and the mounting bracket 4 increases synchronously, further fixing the position of the contact block 6 and ensuring that it is stably in a high position to avoid accidental slippage.

[0031] The above are merely specific embodiments of this utility model, but the protection scope of this utility model is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in this utility model should be included within the protection scope of this utility model. Therefore, the protection scope of this utility model should be determined by the protection scope of the claims.

Claims

1. A gauge for the outer diameter of a cylindrical helical spring, characterized in that, The device includes a base (1) on which a clamping assembly (101) for mounting a cylindrical spring is installed. A movable plate (102) is slidably connected to the base (1). A controller (103) is installed on the movable plate (102). A connecting frame (2) is connected to the top of the movable plate (102) facing the clamping assembly (101). A guide rod (3) is connected inside the connecting frame (2). A mounting frame (4) is slidably connected inside the connecting frame (2). A contact block (6) is slidably connected inside the mounting frame (4). The contact block (6) is slidably connected to the guide rod (3). A fastening screw (5) is threaded to the lower end of the mounting frame (4). The rear end of the fastening screw (5) is pressed against the contact block (6). A rangefinder (7) is installed on the top of the contact block (6). The rangefinder (7) is wiredly connected to the controller (103).

2. The cylindrical helical spring outer diameter gauge according to claim 1, characterized in that, The upper front side of the contact block (6) is connected to a fixed seat (8), and the front end of the fixed seat (8) is rotatably connected to a rotating rod (9). The fixed seat (8) is slidably connected to the front side of the mounting frame (4). The front top of the mounting frame (4) is connected to a top block (10), and the rotating rod (9) is limited to the top block (10).

3. The cylindrical helical spring outer diameter gauge according to claim 1, characterized in that, The contact block (6) is connected to a counterweight (11) at the top, and the rangefinder (7) is located at the top of the counterweight (11).

4. The cylindrical helical spring outer diameter gauge according to claim 2, characterized in that, An auxiliary rod (12) is connected to the front side of the contact block (6). The auxiliary rod (12) is slidably connected to the front side of the mounting bracket (4). The auxiliary rod (12) is located below the fixed seat (8).

5. The cylindrical helical spring outer diameter gauge according to claim 1, characterized in that, A rubber pad (13) is connected to the rear side of the fastening screw (5), and the rubber pad (13) is pressed and engaged with the contact block (6).

6. The cylindrical helical spring outer diameter gauge according to claim 1, characterized in that, The bottom of the contact block (6) is provided with an adapter plate (14), and the bottom of the adapter plate (14) is in contact with the cylindrical spring.

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