Spring pretension measuring device

Abstract

The utility model relates to pre -tension detection technical field, concretely relates to a spring pre -tension measuring device. The spring pre -tension measuring device, include: bearing seat, be provided with spring in the bearing seat, bearing sleeve subassembly is set up in bearing seat, spring provides the elastic driving force for bearing sleeve subassembly, bearing sleeve subassembly includes the bearing, force -application subassembly, force -application subassembly includes pressure sensor and drive structure, pressure sensor sets up just above bearing sleeve subassembly and is attached with bearing sleeve subassembly, drive structure is used for driving pressure sensor moves to the direction close to or away from bearing sleeve subassembly.

Description

Technical Field

[0001] This utility model relates to the field of preload detection technology, specifically to a spring preload measuring device. Background Technology

[0002] To eliminate bearing clearance, electric spindles employ two bearing preload methods: constant pressure preload and positioning preload. Constant pressure preload typically uses a spring assembly to apply force to the rear bearing to achieve preload. When the electric spindle rotates at high speed, it thermally expands, and the springs automatically adjust their position to maintain a stable bearing preload.

[0003] In existing technology, the spring preload of the rear bearing of a constant pressure preload electric spindle mainly depends on the experience of experienced operators. There is no quantitative data on the amount of spring force applied to the bearing, so the preload of the electric spindle after assembly is unknown. Insufficient preload will lead to insufficient rigidity of the electric spindle, while excessive preload will lead to excessive temperature rise during bearing operation. Insufficient rigidity and excessive temperature rise require disassembly of the electric spindle for readjustment, which carries the risk of bearing damage during the adjustment process. Summary of the Invention

[0004] This invention provides a spring preload measuring device to solve the problem that the spring preload of the rear bearing of a constant pressure preload electric spindle mainly depends on experience.

[0005] This utility model provides a spring preload measuring device, comprising: A bearing housing, wherein a spring is provided inside the bearing housing; A bearing sleeve assembly is disposed within the bearing housing, and a spring provides an elastic driving force to the bearing sleeve assembly. The bearing sleeve assembly includes a bearing. The force-applying component includes a pressure sensor and a drive structure. The pressure sensor is disposed directly above the bearing sleeve assembly and is in contact with the bearing sleeve assembly. The drive structure is used to drive the pressure sensor to move toward or away from the bearing sleeve assembly.

[0006] In one alternative embodiment, the drive structure includes a buffer element that is elastic and is used to drive the pressure sensor to move.

[0007] In one optional embodiment, the driving structure includes a push rod, the pressure sensor has a connection hole, a first end of the push rod is movably disposed within the connection hole, the push rod has a first limiting section with a diameter larger than the diameter of the connection hole, the push rod also has a sliding section with a diameter larger than the first limiting section, a pressing member is sleeved on the sliding section, and a buffer member is disposed on the side of the pressing member away from the pressure sensor, the buffer member being used to provide a driving force to the pressing member so that the pressing member fits against the pressure sensor.

[0008] In one optional embodiment, the drive structure further includes a sleeve having a receiving cavity, a second end of the push rod being disposed in the receiving cavity, the diameter of the second end being larger than the diameter of the outlet of the receiving cavity, the outer surface of the second end being in contact with the inner wall of the receiving cavity, the second end being slidably connected to the receiving cavity so that the second end moves relative to the receiving cavity along the guiding direction of the receiving cavity, and the other end of the buffer is connected to the sleeve.

[0009] In one optional embodiment, a connecting flange is fixedly provided at the end of the sleeve away from the pressure sensor. The connecting flange has a threaded hole communicating with the receiving cavity. The connecting flange is threadedly connected to a ball head bolt through the threaded hole. One end of the ball head bolt is disposed in the receiving cavity and abuts against the end face of the second end.

[0010] In one optional embodiment, a positioning element is provided directly above the ball head bolt, and the end of the positioning element facing the ball head bolt has an inverted V-shaped groove, with the ball head of the ball head bolt corresponding to the inverted V-shaped groove.

[0011] In one alternative embodiment, a fixing component is further included, the fixing component comprising a portal frame and a base plate, the portal frame being fixedly mounted on the base plate, the bearing seat being placed on the base plate, and the positioning member being movably mounted on the portal frame, the positioning member being movable toward or away from the ball head bolt.

[0012] In one alternative embodiment, the positioning element is threadedly connected to the gantry frame.

[0013] In one alternative embodiment, the bearing sleeve assembly includes an inner spacer, an outer spacer, and a pressure cap. The inner spacer is disposed between adjacent bearings, the outer spacer wraps around the outside of the bearing, the bottom of the outer spacer abuts against the spring, the spring is disposed on the top of the outer spacer, and the pressure sensor is in contact with the pressure cap.

[0014] In one alternative embodiment, the bearing sleeve assembly is provided with a mounting groove, and the spring is disposed within the mounting groove.

[0015] Beneficial effects: This invention provides a spring preload measuring device that, through the cooperation of a pressure sensor and a drive structure, can accurately measure the maximum preload force exerted by the spring on the bearing, solving the problems of reliance on experienced technicians and lack of quantitative data in traditional methods. This not only improves assembly accuracy but also avoids problems such as insufficient spindle stiffness and excessive temperature rise caused by insufficient or excessive preload force, thereby reducing the risk of bearing damage. Attached Figure Description

[0016] To more clearly illustrate the specific embodiments of this utility model or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0017] Figure 1 This is a front view of a spring preload measuring device according to an embodiment of the present invention; Figure 2 for Figure 1 Cross-sectional view of AA in the middle; Figure 3 for Figure 2 A magnified view of part A in the diagram.

[0018] Explanation of reference numerals in the attached figures: 1. Bearing housing; 101. Mounting groove; 2. Spring; 3. Bearing sleeve assembly; 301. Bearing; 302. Inner spacer; 303. Outer spacer; 304. Pressure cap; 4. Force application assembly; 401. Pressure sensor; 4011. Connecting hole; 402. Drive structure; 4021. Buffer; 4022. Push rod; 40221. First limit section; 40222. Sliding section; 4023. Pressing component; 4024. Sleeve; 4025. Connecting flange; 4026. Ball head bolt; 5. Positioning component; 501. Inverted V-groove; 6. Fixing assembly; 601. Portal frame; 602. Base plate. Detailed Implementation

[0019] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0020] The following is combined with Figures 1 to 3 The following describes embodiments of the present invention.

[0021] According to an embodiment of the present invention, a spring preload measuring device is provided, comprising: a bearing housing 1, a bearing sleeve assembly 3, and a force application component 4. A spring 2 is disposed inside the bearing housing 1, and the bearing sleeve assembly 3 is disposed inside the bearing housing 1. The spring 2 provides elastic driving force to the bearing sleeve assembly 3. The bearing sleeve assembly 3 includes a bearing 301. The force application component 4 includes a pressure sensor 401 and a drive structure 402. The pressure sensor 401 is disposed directly above the bearing sleeve assembly 3 and is in contact with the bearing sleeve assembly 3. The drive structure 402 is used to drive the pressure sensor 401 to move toward or away from the bearing sleeve assembly 3.

[0022] Specifically, spring 2 is located at the bottom of bearing housing 1, bearing sleeve assembly 3 is located inside bearing housing 1, and the bottom of bearing sleeve assembly 3 abuts against spring 2. Force application component 4 is located directly above bearing sleeve assembly 3 to prevent force dispersion. Pressure sensor 401 is in contact with the top surface of bearing sleeve assembly 3. Drive structure 402 applies driving force to pressure sensor 401, causing pressure sensor 401 to apply pressure to bearing sleeve assembly 3. Bearing sleeve assembly 3 presses down spring 2, and the force generated by the deformation of spring 2 reacts to pressure sensor 401. Pressure sensor 401 can transmit data to host computer in real time via wireless or wired means. Host computer can calculate the real-time force parameters through the data transmitted by pressure sensor 401.

[0023] When it is necessary to detect the maximum preload force of spring 2 on bearing 301, spring 2 is not placed in bearing housing 1 first. Bearing sleeve assembly 3 is placed in bearing housing 1, and the height difference between the upper end face of bearing housing 1 and bearing sleeve assembly 3 is measured and recorded as L. Bearing sleeve assembly 3 is removed, spring 2 is placed in, and then bearing sleeve assembly 3 is placed in bearing housing 1. Due to the force of spring 2, bearing sleeve assembly 3 will be lifted. Through the drive structure 402, pressure sensor 401 applies pressure to bearing sleeve assembly 3, pressing spring 2 down. The force generated by the deformation of spring 2 reacts to pressure sensor 401 until the height difference between the upper end face of bearing housing 1 and bearing sleeve assembly 3 returns to the value L. The data measured at this time is the maximum preload force of spring 2 on bearing 301.

[0024] By cooperating with the pressure sensor 401 and the drive structure 402, the maximum preload force exerted by the spring 2 on the bearing 301 can be accurately measured, solving the problem of relying on experienced technicians and lacking quantitative data in traditional methods. This not only improves the accuracy of assembly but also avoids problems such as insufficient spindle stiffness and excessive temperature rise caused by insufficient or excessive preload force, thereby reducing the risk of damage to the bearing 301.

[0025] In one embodiment, the drive structure 402 includes a buffer 4021, which is elastic and is used to drive the pressure sensor 401 to move.

[0026] Specifically, such as Figure 2 As shown, the buffer 4021 applies a driving force to the pressure sensor 401. Because the buffer 4021 is elastic, it can uniformly transmit the force to the pressure sensor 401, avoiding inaccurate measurement by the pressure sensor 401 due to uneven driving force, thereby ensuring the accuracy of the spring 2 preload measurement. Preferably, the buffer 4021 is a disc spring.

[0027] In one embodiment, the drive structure 402 includes a push rod 4022, the pressure sensor 401 has a connection hole 4011, the first end of the push rod 4022 is movably disposed in the connection hole 4011, the push rod 4022 has a first limiting segment 40221, the diameter of the first limiting segment 40221 is larger than the diameter of the connection hole 4011, the push rod 4022 also has a sliding segment 40222, the diameter of the sliding segment 40222 is larger than the diameter of the first limiting segment 40221, a pressing member 4023 is sleeved on the sliding segment 40222, and a buffer member 4021 is disposed on the side of the pressing member 4023 away from the pressure sensor 401. The buffer member 4021 is used to provide a driving force to the pressing member 4023 so that the pressing member 4023 fits against the pressure sensor 401.

[0028] Specifically, such as Figure 2 As shown, the lower end of the push rod 4022 is the first end, which is movably disposed within the connecting hole 4011. The first limiting segment 40221 is used to limit the pressure sensor 401. During detection, the lower end of the push rod 4022 can guide the pressure sensor 401. The sliding segment 40222 is disposed between the first limiting segment 40221 and the upper end of the push rod 4022. The pressing member 4023 is movably sleeved on the sliding segment 40222. The disc spring is disposed at the end of the pressing member 4023 away from the pressure sensor 401. When the disc spring is stressed, it will drive the pressing member 4023 to slide relative to the sliding segment 40222 along the guiding direction of the sliding segment 40222, and finally abut against the pressure sensor 401, applying a driving force to the pressure sensor 401.

[0029] This structural design enables the pressure sensor 401 to remain stable when subjected to driving force, avoiding measurement errors caused by uneven force. Simultaneously, the coordinated use of the push rod 4022 and the pressing element 4023 also improves the stability and reliability of the entire drive structure 402.

[0030] In one embodiment, the drive structure 402 further includes a sleeve 4024, which has a receiving cavity. The second end of the push rod 4022 is disposed in the receiving cavity. The diameter of the second end is larger than the diameter of the outlet of the receiving cavity. The outer surface of the second end is in contact with the inner wall of the receiving cavity. The second end is slidably connected to the receiving cavity so that the second end moves relative to the receiving cavity along the guiding direction of the receiving cavity. The other end of the buffer member 4021 is connected to the sleeve 4024.

[0031] Specifically, sleeve 4024 is disposed at the upper end of push rod 4022. Sleeve 4024 and push rod 4022 are coaxially arranged, and the upper end of push rod 4022 is the second end. The upper end of push rod 4022 is disposed within the receiving cavity of sleeve 4024. Because the diameter of the upper end of push rod 4022 is larger than the diameter of the outlet of receiving cavity, the outlet of receiving cavity can limit the upper end of push rod 4022, preventing the upper end of push rod 4022 from coming out of receiving cavity. During detection, sleeve 4024 is subjected to force and moves towards pressure sensor 401, allowing the upper end of push rod 4022 to move relative to it along the guide direction of receiving cavity. The lower end face of sleeve 4024 is connected to disc spring, and sleeve 4024 drives pressing member 4023 to slide relative to it along the guide direction of sliding section 40222 through disc spring.

[0032] The sleeve 4024 further enhances the stability of the drive structure 402. The second end of the push rod 4022 slides within the receiving cavity, guided and constrained by the sleeve 4024, making the push rod 4022 move more smoothly. Simultaneously, the connection between the buffer 4021 and the sleeve 4024 ensures that the buffer 4021 can stably apply driving force to the push rod 4022, thereby improving the accuracy and reliability of the entire measuring device.

[0033] In one embodiment, a connecting flange 4025 is fixedly provided at the end of the sleeve 4024 away from the pressure sensor 401. The connecting flange 4025 has a threaded hole communicating with the receiving cavity. The connecting flange 4025 is threadedly connected to the ball head bolt 4026 through the threaded hole. One end of the ball head bolt 4026 is disposed in the receiving cavity and abuts against the end face of the second end.

[0034] Specifically, a connecting flange 4025 is fixedly provided at the upper end of the sleeve 4024. The connecting flange 4025 is fixedly connected to the sleeve 4024 by bolts. A threaded hole is opened at the center of the connecting flange 4025. A ball head bolt 4026 is threadedly connected to the threaded hole. The lower end of the ball head bolt 4026 extends into the receiving cavity and abuts against the upper end face of the push rod 4022. By rotating the ball head bolt 4026, the connecting flange 4025 drives the sleeve 4024 to move relative to each other.

[0035] In one embodiment, a positioning member 5 is provided directly above the ball head bolt 4026. The end of the positioning member 5 facing the ball head bolt 4026 has an inverted V-shaped groove 501, and the ball head of the ball head bolt 4026 corresponds to the inverted V-shaped groove 501.

[0036] Specifically, before testing, the drive positioning component 5 moves toward the ball head bolt 4026, so that the ball head of the ball head bolt 4026 extends into the inverted V-shaped groove 501 to complete the positioning.

[0037] In one embodiment, a fixing component 6 is also included. The fixing component 6 includes a portal frame 601 and a base plate 602. The portal frame 601 is fixedly mounted on the base plate 602. The bearing seat 1 is placed on the base plate 602. The positioning member 5 is movably mounted on the portal frame 601. The positioning member 5 can move toward or away from the ball head bolt 4026.

[0038] Specifically, the lower ends of the two vertical parts of the portal frame 601 are fixedly connected to the base plate 602, the bearing seat 1 and the force application component 4 are both placed on the base plate 602 and located between the two vertical parts, and the positioning member 5 is movably positioned on the horizontal part of the portal frame 601.

[0039] In one embodiment, the positioning element 5 is threadedly connected to the gantry frame 601.

[0040] Specifically, the horizontal part of the portal frame 601 has a threaded hole, and the positioning member 5 is threadedly connected to the threaded hole. By rotating the positioning member 5, it can move up and down on the portal frame 601, thereby adjusting the distance between the positioning member 5 and the ball head bolt 4026.

[0041] In one embodiment, the bearing sleeve assembly 3 includes an inner spacer 302, an outer spacer 303, and a pressure cap 304. The inner spacer 302 is disposed between adjacent bearings 301, the outer spacer 303 is wrapped around the outside of the bearing 301, the bottom of the outer spacer 303 abuts against the spring 2, the spring 2 is disposed on the top of the outer spacer 303, and the pressure sensor 401 is in contact with the pressure cap 304.

[0042] Specifically, when the spring 2 is not installed, the height difference between the upper end face of the bearing seat 1 and the pressure cap 304 is a value L. The fit design of the pressure cap 304 and the pressure sensor 401 also ensures that the pressure sensor 401 can accurately receive the pressure signal received by the bearing sleeve assembly 3, thereby realizing the accurate measurement of the preload of the spring 2.

[0043] In one embodiment, the bearing sleeve assembly 3 is provided with a mounting groove 101, and the spring 2 is disposed in the mounting groove 101.

[0044] Specifically, the mounting groove 101 ensures a more secure installation of the spring 2 within the bearing sleeve assembly 3. The spring 2 is confined within the mounting groove 101, preventing it from shifting or sliding during measurement, thus guaranteeing measurement accuracy. Simultaneously, this design simplifies the installation and replacement process of the spring 2, improving the ease of use of the measuring device.

[0045] Although embodiments of the present invention have been described in conjunction with the accompanying drawings, those skilled in the art can make various modifications and variations without departing from the spirit and scope of the present invention, and such modifications and variations all fall within the scope defined by the appended claims.

Claims

1. A spring preload measuring device, characterized in that, include: Bearing housing (1), and a spring (2) is provided inside the bearing housing (1); A bearing sleeve assembly (3) is disposed in the bearing housing (1), and the spring (2) provides elastic driving force for the bearing sleeve assembly (3). The bearing sleeve assembly (3) includes a bearing (301). The force application component (4) includes a pressure sensor (401) and a drive structure (402). The pressure sensor (401) is disposed directly above the bearing sleeve assembly (3) and is in contact with the bearing sleeve assembly (3). The drive structure (402) is used to drive the pressure sensor (401) to move toward or away from the bearing sleeve assembly (3).

2. The spring preload measuring device according to claim 1, characterized in that, The drive structure (402) includes a buffer (4021) which is elastic and is used to drive the pressure sensor (401) to move.

3. The spring preload measuring device according to claim 2, characterized in that, The drive structure (402) includes a push rod (4022), the pressure sensor (401) has a connection hole (4011), the first end of the push rod (4022) is movably disposed in the connection hole (4011), the push rod (4022) has a first limiting section (40221), the diameter of the first limiting section (40221) is larger than the diameter of the connection hole (4011), and the push rod (4022) also has a sliding section (40222). The diameter of the sliding segment (40222) is larger than that of the first limiting segment (40221). A pressing member (4023) is sleeved on the sliding segment (40222). A buffer member (4021) is disposed on the side of the pressing member (4023) away from the pressure sensor (401). The buffer member (4021) is used to provide a driving force to the pressing member (4023) so that the pressing member (4023) fits against the pressure sensor (401).

4. The spring preload measuring device according to claim 3, characterized in that, The drive structure (402) further includes a sleeve (4024) having a receiving cavity inside. The second end of the push rod (4022) is disposed in the receiving cavity. The diameter of the second end is larger than the diameter of the outlet of the receiving cavity. The outer surface of the second end is in contact with the inner wall of the receiving cavity. The second end is slidably connected to the receiving cavity so that the second end moves relative to the receiving cavity along the guiding direction of the receiving cavity. The other end of the buffer (4021) is connected to the sleeve (4024).

5. The spring preload measuring device according to claim 4, characterized in that, A connecting flange (4025) is fixedly provided at one end of the sleeve (4024) away from the pressure sensor (401). The connecting flange (4025) has a threaded hole communicating with the receiving cavity. The connecting flange (4025) is threadedly connected to a ball head bolt (4026) through the threaded hole. One end of the ball head bolt (4026) is located in the receiving cavity and abuts against the end face of the second end.

6. The spring preload measuring device according to claim 5, characterized in that, A positioning element (5) is provided directly above the ball head bolt (4026). The positioning element (5) has an inverted V-shaped groove (501) at one end facing the ball head bolt (4026), and the ball head of the ball head bolt (4026) corresponds to the inverted V-shaped groove (501).

7. The spring preload measuring device according to claim 6, characterized in that, It also includes a fixing component (6), which includes a portal frame (601) and a base plate (602). The portal frame (601) is fixedly mounted on the base plate (602), the bearing seat (1) is placed on the base plate (602), and the positioning member (5) is movably mounted on the portal frame (601). The positioning member (5) can move toward or away from the ball head bolt (4026).

8. The spring preload measuring device according to claim 7, characterized in that, The positioning element (5) is threadedly connected to the gantry frame (601).

9. The spring preload measuring device according to any one of claims 1 to 8, characterized in that, The bearing sleeve assembly (3) includes an inner spacer (302), an outer spacer (303), and a pressure cap (304). The inner spacer (302) is disposed between adjacent bearings (301). The outer spacer (303) wraps around the outside of the bearing (301). The bottom of the outer spacer (303) abuts against the spring (2). The spring (2) is disposed on the top of the outer spacer (303). The pressure sensor (401) is in contact with the pressure cap (304).

10. The spring preload measuring device according to claim 9, characterized in that, The bearing sleeve assembly (3) is provided with a mounting groove (101), and the spring (2) is provided in the mounting groove (101).

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