A clearance adjustment, pre-tightening and monitoring mechanism for a gear rack transmission

Abstract

The present invention provides a clearance adjustment, pre-tightening and monitoring mechanism for a gear rack pair transmission to achieve precise control of the meshing clearance and wear monitoring of a single gear rack pair transmission mechanism, comprising: a slide plate, an upper end surface of which is provided with an adjustment groove; a single gear rack pair transmission mechanism, comprising a driving device, a gear, a rack connected to the gear meshing transmission and a mounting plate, the driving device is fixedly connected to the mounting plate and the output end is connected to the gear transmission, and the mounting plate is slidably connected to the adjustment groove; a clearance adjustment, pre-tightening mechanism, which is arranged between the slide plate and the mounting plate, and is used to adjust the meshing clearance between the gear and the rack and apply a pre-tightening force; a gear wear monitoring mechanism, comprising a monitoring plate fixedly connected to the top of the slide plate, a dial indicator and a displacement sensor fixedly connected to the monitoring plate, a monitoring reference surface matched with the dial indicator and the displacement sensor measuring head is arranged on the mounting plate, the device always maintains the clearance-free meshing of the single gear rack pair transmission mechanism, and monitors the gear wear in real time.

Description

Technical Field

[0001] The invention relates to the technical field of rail processing equipment, and in particular to a clearance adjustment, pre-tightening and monitoring mechanism for a gear rack pair transmission. Background Art

[0002] At present, the ultra-long displacement drive system of heavy equipment such as rail CNC drilling machines usually adopts a "dual-motor electrical anti-backlash gear rack transmission mechanism". The transmission mechanism is composed of a double-group gear transmission mechanism (including servo motors, reducers and helical gears) and a single-group precision fixed-length rack. The double-group gear transmission mechanism is respectively pressed against the two opposite tooth surfaces of the precision fixed-length rack to eliminate the tooth side clearance. At the same time, by revising the dual-motor torque transmission parameters of the CNC system, the double-group gear transmission mechanism can achieve the sequential output of the master and slave torque while maintaining the tension, thereby improving the (repeatable) positioning accuracy and dynamic response characteristics of the equipment, and is widely used in the ultra-long displacement (more than 6 meters) drive system of heavy equipment such as rail CNC drilling machines; and the production and manufacturing and use and maintenance costs of the equipment are bound to increase, so it is necessary to develop a simple, efficient and practical single-gear rack transmission mechanism. Summary of the invention

[0003] The present invention provides a clearance adjustment, pre-tightening and monitoring mechanism for a gear rack transmission, so as to realize precise control of the meshing clearance and wear monitoring of a single gear rack transmission mechanism, and improve machining accuracy and machining efficiency. In order to achieve the above purpose, the technical scheme adopted is as follows:

[0004] A clearance adjustment, pre-tightening and monitoring mechanism for a gear rack transmission, characterized in that it comprises:

[0005] A slide plate, wherein the slide plate is slidably connected above the bed and an adjustment groove is provided on the upper end surface;

[0006] The single gear rack transmission mechanism is composed of a driving device, a gear, a rack and a mounting plate. The driving device is fixedly connected to the mounting plate and the output end is connected to the gear transmission. The gear is meshed and connected to the rack. The mounting plate is slidably connected to the adjustment slot along the moving direction of the gear.

[0007] The clearance adjustment preload mechanism is arranged between the slide plate and the mounting plate, and is used to accurately adjust the meshing clearance between the gear and the rack and apply appropriate preload force;

[0008] The gear wear monitoring mechanism includes a monitoring plate, a dial indicator fixedly connected to the monitoring plate, and a displacement sensor. The monitoring plate is fixedly connected above the slide plate, and the monitoring plate and the clearance adjustment pre-tightening mechanism are relatively distributed on both sides of the gear movement direction of the adjustment groove. One end of the detection head of the dial indicator passes through the monitoring plate and fits with the first reference surface set on the mounting plate. One end of the sensing head of the displacement sensor passes through the monitoring plate and fits with the second reference surface set on the mounting plate, and the first reference surface and the second reference surface are located in the same plane.

[0009] Furthermore, the driving device includes a servo motor and a reducer. The reducer is fixedly connected to the mounting plate and its input end is transmission-connected to the output end of the servo motor. The output end of the reducer is transmission-connected to the gear. A gap adjustment preload mechanism is also connected between the mounting plate and the slide plate, which is used to adjust the precise position of the mounting plate in the moving direction of the gear to drive the gear to approach the rack and mesh with it, while applying appropriate preload force.

[0010] Furthermore, the clearance adjustment preload mechanism includes an adjusting plate, an adjusting bolt, a disc spring guide column and a disc spring, the adjusting plate is fixedly connected to the top of the slide plate, the adjusting plate and the monitoring plate are relatively distributed on both sides of the adjusting groove, and the adjusting plate and the mounting plate are spaced apart, the length of the adjusting bolt is distributed along the moving direction of the gear, one end of the adjusting bolt in the length direction is threadedly connected to the adjusting plate and penetrates the adjusting plate and then is tightened against the side of the mounting plate, the disc spring guide column is threadedly connected to the adjusting plate, and one end of the disc spring guide column is connected to the mounting plate after penetrating the adjusting plate, the disc spring is sleeved on the outside of the disc spring guide column and its two ends are respectively connected to the shoulder of the disc spring guide column and the side of the mounting plate, and the adjusting bolt and the adjusting plate, the disc spring guide column and the adjusting plate are respectively fixedly connected by a first fastening nut and a second fastening nut.

[0011] Furthermore, a groove is provided on the side of the mounting plate close to the adjusting plate, the groove cooperates with the disc spring guide column, and one end of the disc spring guide column in the length direction can be slidably connected to the inside of the groove along the moving direction of the gear.

[0012] Furthermore, a pressure plate is fixedly connected above the slide plate, and two groups of the pressure plates are provided and are respectively located on both sides of the mounting plate, and the mounting plate is slidably connected between the two pressure plates along the moving direction of the gear.

[0013] Furthermore, a dial indicator mounting hole is fixedly provided on the monitoring plate, and the dial indicator mounting hole is distributed through the monitoring plate along the moving direction of the gear, and the dial indicator is fixedly connected to the monitoring plate.

[0014] Furthermore, a positioning sleeve is fixedly connected to the monitoring plate, the positioning sleeve is distributed through the monitoring plate along the moving direction of the gear, and the displacement sensor is fixedly connected to the positioning sleeve.

[0015] Furthermore, the displacement sensor is preset with a displacement threshold value, which is used to send a signal to an external control system to control the driving device to stop when the measured displacement is greater than or equal to the displacement threshold value.

[0016] The beneficial effects of the present invention are:

[0017] 1. By setting the mounting plate, the gear can be driven to approach the rack along the width direction of the slide plate and mesh with it, so as to accurately adjust the matching clearance between the gear and rack pair. At the same time, a clearance adjustment preload mechanism is set between the slide plate and the mounting plate. The disc spring applies appropriate preload force to the mounting plate to make the meshing clearance between the gear and the rack adaptively adjusted, which can eliminate the transmission clearance of the single gear and rack transmission mechanism to ensure its dynamic response characteristics;

[0018] 2. A gear wear monitoring mechanism is set up, which can display the exact meshing position of the gear and rack in real time through a dial indicator, so that adjustments can be made by adjusting bolts and disc spring guides during installation to meet the design requirements. In addition, the displacement of the mounting plate is monitored by a displacement sensor, and the gear wear data can be monitored in real time. At the same time, the displacement threshold is set to ensure that when the gear wear exceeds the preset threshold, the single gear rack transmission mechanism can be controlled to stop working by sending an early warning signal, and then the gear is replaced to avoid product processing defects caused by displacement errors due to gear wear. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 Schematic diagram of the three-dimensional structure of the present invention

[0020] Figure 2 A three-dimensional structural diagram from another perspective of this utility model

[0021] Figure 3 This is a schematic diagram of the three-dimensional structure of the present invention from the bottom perspective

[0022] Figure 4 The front view of the single gear rack transmission mechanism

[0023] Figure 5 for Figure 4 AA section view in

[0024] Figure 6 for Figure 5 A partial enlarged schematic diagram of point Ⅰ in the middle

[0025] Figure 7 The side view of the structure of the present invention

[0026] Figure 8 for Figure 7 Schematic diagram of the partial enlarged structure at center II

[0027] Fig. 9 for Figure 8Schematic diagram of the BB section view after flipping 90° clockwise

[0028] Fig.10 for Figure 7 CC section view in

[0029] Fig.11 for Figure 7 DD section view in

[0030] Fig.12 for Fig.11 A partial enlarged schematic diagram of point III in the middle

[0031] in:

[0032] 1- Skateboard;

[0033] 2-mounting plate, 201-first monitoring reference surface, 202-second monitoring reference surface, 203-groove;

[0034] 3-Servo motor, 4-reducer, 5-gear, 6-rack, 7-monitoring board, 8-dial indicator, 9-displacement sensor, 10-adjusting slot, 11-first fastening screw, 12-positioning sleeve, 13-second fastening screw, 14-adjusting plate, 15-adjusting bolt, 16-first fastening nut, 17-disc spring guide column, 18-disc spring, 19-second fastening nut, 20-pressure plate. DETAILED DESCRIPTION

[0035] The exemplary embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. Although the exemplary embodiments of the present disclosure are shown in the accompanying drawings, it should be understood that the present disclosure can be implemented in various forms and should not be limited by the embodiments set forth herein. On the contrary, these embodiments are provided to enable a more thorough understanding of the present disclosure and to fully convey the scope of the present disclosure to those skilled in the art.

[0036] In the description of the invention, it is necessary to understand that the terms "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside" and "outside" etc., indicating orientations or positional relationships, are based on the viewing direction or positional relationships and are only for the convenience of describing the invention, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the invention.

[0037] In this embodiment, for ease of description, the length direction of the slide plate 1, i.e., the direction in which the slide plate 1 moves along the bed, is the front-to-back direction, and the width direction of the slide plate 1, i.e., the direction in which the gear 5 moves, is the left-to-right direction.

[0038] like Figure 1The gap adjustment, pre-tightening and monitoring mechanism of a gear rack pair transmission shown in the figure comprises a slide plate 1, a single gear rack pair transmission mechanism, a gap adjustment, pre-tightening mechanism and a gear wear monitoring mechanism. The slide plate 1 is slidably connected to the top of the bed through a linear guide pair and is driven by a single gear rack pair transmission mechanism. A gap adjustment, pre-tightening mechanism is provided between the gear 5 and the rack 6 of the single gear rack pair transmission mechanism, so that the meshing gap between the two can be accurately adjusted and appropriate pre-tightening force can be applied; in addition, by providing a gear wear monitoring mechanism, the wear of the gear 5 can be monitored in real time, so that the gear 5 can be replaced in time to ensure the displacement accuracy of the single gear rack pair transmission mechanism.

[0039] Specifically, a single gear rack transmission mechanism such as Figure 1-Figure 4 As shown, it includes a mounting plate 2, a servo motor 3, a reducer 4, a gear 5, and a rack 6. An adjusting groove 10 is arranged on the upper end surface of the skateboard 1. The mounting plate 2 can be slidably connected to the inside of the adjusting groove 10 along the left and right directions. The output shaft of the servo motor 3 is transmission-connected to the input shaft of the reducer 4. The output shaft of the reducer 4 passes through the skateboard 1 in the vertical direction and is transmission-connected to the gear 5. The gear 5 is located below the skateboard 1. The rack 6 is fixedly connected to the top of the bed, and its length is horizontally distributed along the front and rear directions. The gear 5 is meshingly transmission-connected to the rack 6, and the body of the reducer 4 is fixedly connected to the mounting plate 2.

[0040] Gap adjustment preload mechanism Figure 1 , Figure 2 , Figure 7 as well as Figure 10-12As shown, it includes an adjusting plate 14, an adjusting bolt 15, a disc spring guide column 17, and a disc spring 18. The adjusting plate 14 is fixedly connected to the right position in the adjusting slot 10, and the length is horizontally distributed along the front-to-back direction. There are two groups of adjusting bolts 15, which are symmetrically arranged at the front and rear ends of the adjusting plate 14. The adjusting bolt 15 is threadedly connected to the adjusting plate 14 and passes through the adjusting plate 14 from right to left and then is tightened on the right side surface of the mounting plate 2. A first fastening nut 16 is threadedly connected to the adjusting bolt 15, and the first fastening nut 16 is located between the adjusting plate 14 and the mounting plate 2. The mounting plate 2 can be driven to move to the left by the adjusting bolt 15, thereby driving the gear 5 to move to the side of the rack 6, so as to accurately adjust the meshing clearance between the gear 5 and the rack 6, and the adjusting bolt 15 is fixed to the adjusting plate 14 by the first fastening nut 16; the disc spring guide column 17 is threadedly connected to the adjusting plate 14 It is connected and passes through the adjustment plate 14 from right to left and then extends into the groove 203 on the right side surface of the mounting plate 2, and the disc spring guide column 17 can be slidably connected to the groove 203 left and right. A shoulder is provided in the middle of the disc spring guide column 17, and a disc spring 18 is sleeved between the shoulder and the right side surface of the mounting plate 2. In addition, a second fastening nut 19 is threadedly connected to the disc spring guide column 17, and the second fastening nut 19 is located between the adjustment plate 14 and the mounting plate 2. By adjusting the length of the disc spring guide column 17 extending into the groove 203 or adjusting the distance between the end of the disc spring guide column 17 and the right side surface of the mounting plate 2, the compression length of the disc spring 18 can be adjusted, thereby adjusting the pre-tightening force of the disc spring 18 on the mounting plate 2 to apply an appropriate pre-tightening force to the mounting plate 2; when adjusted to an appropriate pre-tightening force, the disc spring guide column 17 can be fixed to the adjustment plate 14 by the second fastening nut 19.

[0041] The mounting plate 2 can be pushed to move leftward along the width direction of the slide plate 1 by adjusting the bolt 15 to accurately adjust the meshing position between the gear 5 and the rack 6. After the adjusting bolt 15 is adjusted, the position of the adjusting bolt 15 is fixed by the first fastening nut 16; and then the compression length of the disc spring 18 can be adjusted by adjusting the length of the disc spring guide column 17 extending into the groove 203 to adjust the preload force of the mounting plate 2, thereby eliminating the transmission clearance of the single gear rack transmission mechanism to ensure its dynamic response characteristics.

[0042] In addition, two groups of pressure plates 20 are detachably fixedly connected above the slide plate 1 by bolts. The two groups of pressure plates 20 are respectively located on the front and rear sides of the mounting plate 2. The upper and lower positions of the mounting plate 2 can be limited by the two groups of pressure plates 20 to ensure smooth sliding of the mounting plate 2.

[0043] Gear wear monitoring mechanism such as Figure 1 , Figure 2 as well as Figure 5-Figure 9As shown, it includes a monitoring plate 7, a dial indicator 8, and a displacement sensor 9, wherein the monitoring plate 7 is fixedly connected to the top of the slide plate 1 and is located above the left end of the mounting plate 2, and a first monitoring reference plane 201 and a second monitoring reference plane 202 are provided on the left side of the monitoring plate 7, and the two reference planes are located in the same plane; the dial indicator 8 is fixedly connected to the monitoring plate 7, and the measuring rod of the dial indicator 8 is distributed from left to right through the monitoring plate 7, and the measuring head of the dial indicator 8 corresponds to the position of the first monitoring reference plane 201 and is pressed against the first monitoring reference plane 201, and the position of the measuring head is locked by the first fastening screw 11, so as to fix the dial indicator, and the setting of the dial indicator 8 can display the accurate position of the meshing of the gear 5 and the rack 6 in real time, so as to facilitate adjustment by adjusting the bolt 15 and the disc spring guide column 17 during the installation process to meet the design requirements, and at the same time track and display the gear wear data; the displacement sensor 9 is fixedly connected to the monitoring plate 7, specifically, a positioning sleeve 12 is provided at the rear end position of the monitoring plate 7, the positioning sleeve 12 penetrates the monitoring plate 7 from left to right and is detachably fixedly connected to the monitoring plate 7 by a second fastening screw 13, the measuring rod of the displacement sensor 9 is detachably fixedly connected to the inside of the positioning sleeve 12 by a fastening screw and is coaxially distributed with the positioning sleeve 12, the measuring head of the displacement sensor 9 passes through the positioning sleeve 12 and is pressed against the second monitoring reference surface 202, the displacement sensor 9 is connected to the external control system signal, and a displacement threshold is also preset in the displacement sensor 9, when the displacement value of the mounting plate 2 detected by the displacement sensor 9 is greater than the displacement threshold, the displacement sensor 9 sends a warning signal to the external control system to control the servo motor 3 to stop working, thereby avoiding affecting the subsequent processing accuracy of the product due to excessive wear of the gear 5, and the setting of the displacement sensor 9 can accurately detect the wear of the gear and send a signal.

[0044] In this embodiment, the specification model of the high-precision contact displacement sensor is MR-D28-485, which has a measurement range of 1 mm, a resolution of 0.2 μm, and a repeatability accuracy of up to 5 μm.

[0045] The technical solution adopted by the present invention can always maintain the gapless meshing of the single gear rack transmission mechanism when there is a pitch error and a reverse clearance in the single gear rack transmission mechanism, and automatically compensate for the corresponding clearance when it is slightly worn. At the same time, the gear wear data and the gear wear are monitored in real time through the dial indicator and the displacement sensor and the signal is sent, thereby realizing accurate monitoring of the rail processing process and improving the product processing accuracy and efficiency.

[0046] The above description is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements can be made without departing from the principle of the present invention. These improvements should also be regarded as the protection scope of the present invention.

Claims

1. A clearance adjustment, pre-tightening and monitoring mechanism for a gear rack transmission, characterized in that: include: A slide plate, wherein the slide plate is slidably connected above the bed and an adjustment groove is provided on the upper end surface; The single gear rack transmission mechanism is composed of a driving device, a gear, a rack and a mounting plate. The driving device is fixedly connected to the mounting plate and the output end is connected to the gear transmission. The gear is meshed and connected to the rack. The mounting plate is slidably connected to the adjustment slot along the moving direction of the gear. The gap adjustment pre-tightening mechanism is arranged between the slide plate and the mounting plate, and is used to adjust the precise position of the mounting plate in the moving direction of the gear, so as to drive the gear to approach the rack and mesh with it, and at the same time apply an appropriate pre-tightening force. The gap adjustment pre-tightening mechanism includes an adjusting plate, an adjusting bolt, a disc spring guide column and a disc spring. The adjusting plate is fixedly connected to the top of the slide plate, and the adjusting plate and the monitoring plate are relatively distributed on both sides of the adjusting groove, and the adjusting plate and the mounting plate are spaced apart. The length of the adjusting bolt is distributed along the moving direction of the gear, and one end of the adjusting bolt in the length direction is threadedly connected to the adjusting plate and passes through the rear top of the adjusting plate Tightly attached to the side of the mounting plate, the disc spring guide column is threadedly connected to the adjustment plate, and one end of the disc spring guide column is connected to the mounting plate after passing through the adjustment plate, the disc spring is sleeved on the outside of the disc spring guide column and the two ends are respectively connected to the shaft shoulder of the disc spring guide column and the side of the mounting plate, and the adjusting bolt and the adjusting plate, the disc spring guide column and the adjusting plate are respectively fixedly connected by a first fastening nut and a second fastening nut, a groove is provided on the side of the mounting plate close to the adjustment plate, the groove cooperates with the disc spring guide column, and one end of the disc spring guide column in the length direction can be slidably connected to the inside of the groove along the moving direction of the gear; The gear wear monitoring mechanism includes a monitoring plate, a dial indicator fixedly connected to the monitoring plate, and a displacement sensor. The monitoring plate is fixedly connected above the slide plate, and the monitoring plate and the clearance adjustment pre-tightening mechanism are relatively distributed on both sides of the gear movement direction of the adjustment groove. One end of the detection head of the dial indicator passes through the monitoring plate and fits with the first reference surface set on the mounting plate. One end of the sensing head of the displacement sensor passes through the monitoring plate and fits with the second reference surface set on the mounting plate, and the first reference surface and the second reference surface are located in the same plane.

2. The clearance adjustment, pre-tightening and monitoring mechanism of the gear rack transmission according to claim 1, characterized in that: The driving device comprises a servo motor and a reducer. The reducer is fixedly connected to the mounting plate and its input end is transmission-connected to the output end of the servo motor, and the output end of the reducer is transmission-connected to the gear.

3. The clearance adjustment, pre-tightening and monitoring mechanism for a gear rack transmission according to claim 1, characterized in that: A pressing plate is also fixedly connected above the slide plate. Two groups of pressing plates are provided and are respectively located at both sides of the mounting plate. The mounting plate is slidably connected between the two pressing plates along the moving direction of the gear.

4. The clearance adjustment, pre-tightening and monitoring mechanism for a gear rack transmission according to claim 1, characterized in that: The monitoring plate is provided with dial indicator mounting holes, the dial indicator mounting holes are distributed through the monitoring plate along the gear moving direction, and the dial indicator is fixedly connected to the monitoring plate.

5. The clearance adjustment, pre-tightening and monitoring mechanism for a rack and pinion transmission according to claim 1, characterized in that: A positioning sleeve is fixedly connected to the monitoring plate, and the positioning sleeve is distributed through the monitoring plate along the moving direction of the gear, and the displacement sensor is fixedly connected to the positioning sleeve.

6. The clearance adjustment, pre-tightening and monitoring mechanism for a gear rack transmission according to claim 1, characterized in that: The displacement sensor is preset with a displacement threshold value, which is used to send a signal to the external control system to control the driving device to stop when the measured displacement is greater than or equal to the displacement threshold value.

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