A kind of anti-backlash transmission device for tool changing mechanism and double tool changing position chain type tool magazine

Abstract

The present application relates to tool changing mechanism transmission technical field, especially a kind of double tool changing position chain tool magazine and the anti-backlash transmission device for tool changing mechanism, comprising: first linear assembly is arranged between the crossbeam of rack and tool changing mechanism, first linear assembly includes main rack, gear and auxiliary rack, main rack is fixed to crossbeam side wall, and lower surface is provided with meshing tooth;Gear is rotatably installed on tool changing mechanism, and is engaged with main rack;Auxiliary rack is arranged below gear, and the meshing portion at its length direction both ends is respectively arranged on the two sides of gear, and auxiliary rack is installed on crossbeam by drive assembly;When tool changing mechanism moves to the position of tool changing point, gear stops rotating, and drive assembly continues to drive the meshing portion of one end of auxiliary rack to push gear to generate linear movement, can compensate driving to gear in reversing clearance zone, fill in tooth side gap, eliminate transmission delay and reversing impact, realize the reversing transmission of no idle, no impact, no transmission lag.

Description

Technical Field

[0001] This invention relates to the field of tool changing mechanism transmission technology, and in particular to a backlash-free transmission device for tool changing mechanisms and a double-tool-changing chain-type tool magazine. Background Technology

[0002] During the tool changing process of a chain tool magazine, the tool changing procedure has clear timing requirements: First, the tool changing mechanism needs to be moved to the corresponding tool changing point position of the tool magazine. Then, the tool holding and pulling actions are completed by rotating or moving the tool changing arm. Finally, the tool changing mechanism is moved to the spindle tool changing position, and the spindle tool changing operation is realized by rotating or moving the tool changing arm.

[0003] The positional accuracy of the tool change point directly determines the reliability and accuracy of the tool change action. Therefore, in the existing technology, the movement of the tool change mechanism usually adopts a gear and rack precision meshing transmission method. With its simple structure and high transmission efficiency, this transmission method can, to a certain extent, ensure the transmission stability and positioning accuracy of the tool change mechanism and meet the basic tool change requirements of the chain tool magazine.

[0004] However, when the tool changing mechanism moves to one side, the tooth surface of one side of the gear and the corresponding tooth surface of the rack are closely engaged, achieving stable transmission. But when the gear needs to rotate in the opposite direction to drive the tool changing mechanism to move in the opposite direction, due to the unavoidable tooth backlash between the gear and the rack, the gear will only idle during the period before the other tooth surface of the gear and the other tooth surface of the rack are engaged, and cannot drive the tool changing mechanism to produce the corresponding reverse movement. This leads to a significant movement delay in the tool changing mechanism, affecting tool changing efficiency and accuracy. At the same time, at the moment when the gear rotates in the opposite direction and its tooth surface contacts the other tooth surface of the rack, due to the existence of the backlash, a significant tooth surface impact phenomenon will occur. This will not only produce impact noise, but also accelerate tooth surface wear. After long-term use, this will further reduce transmission stability and positioning accuracy, shorten the service life of the gear and rack, and may even cause the tool changing action to jam, affecting the normal operation of the chain tool magazine. Summary of the Invention

[0005] This invention provides a backlash-free transmission device for a tool changing mechanism and a double-tool-changing chain-type tool magazine, which can effectively solve the problems in the background art.

[0006] To achieve the above objectives, the technical solution adopted by the present invention is as follows:

[0007] A backlash-free transmission device for a tool changing mechanism includes a first linear component disposed between a crossbeam of the frame and the tool changing mechanism, for driving the tool changing mechanism to move along the length of the crossbeam to a tool changing point. The first linear component includes:

[0008] The main rack is fixedly mounted on the side wall of the crossbeam, and its lower surface is provided with meshing teeth;

[0009] The gear is rotatably mounted on the tool changing mechanism and meshes with the main rack;

[0010] An auxiliary rack is disposed below the gear, with the meshing portions of the auxiliary rack at both ends along its length direction corresponding to the two sides of the gear, and the auxiliary rack is mounted on the crossbeam via a drive assembly;

[0011] When the gear meshes with the main rack, the auxiliary rack moves synchronously with the gear under the drive of the drive assembly, and the meshing parts at both ends remain disengaged from the gear and do not contact it.

[0012] When the tool changing mechanism moves to the tool changing point, the gear stops rotating, and the drive assembly continues to drive the meshing part at one end of the auxiliary rack to push the gear to make linear movement, which is used to fill the tooth backlash between the gear and the main rack.

[0013] Furthermore, the tool changing mechanism and the first linear assembly are slidably mounted on the crossbeam via a transverse plate;

[0014] The first linear component is disposed on the inner sidewall of the transverse plate facing the crossbeam;

[0015] The first linear component further includes a first drive motor, which and the tool changing mechanism are respectively disposed at both ends of the outer side wall of the transverse plate along the gear moving direction.

[0016] Furthermore, a hollow vertical beam is provided between the tool changing mechanism and the transverse plate;

[0017] The hollow vertical beam is equipped with a second linear component for driving the tool changing mechanism to move up and down in the vertical direction;

[0018] The second linear component includes a cylinder and a drive block disposed on the tool changing mechanism; the drive end of the cylinder is connected to the drive block, and the cylinder is installed in the hollow cavity of the hollow vertical beam.

[0019] Furthermore, guide rail assemblies are provided between the transverse plate and the crossbeam, and between the tool changing mechanism and the vertical beam.

[0020] Furthermore, the first drive motor is mounted on the transverse plate via a sliding plate;

[0021] The transverse plate has a groove, and the slide plate is embedded in the groove. Adjusting bolts are provided on the top and bottom surfaces of the slide plate. The two adjusting bolts are used to adjust the vertical position of the slide plate in the groove, thereby adjusting the meshing position of the gear between the main rack and the auxiliary rack.

[0022] Furthermore, the front side wall of the crossbeam is provided with a mounting plate, and the main rack is fixedly installed on the side wall of the mounting plate away from the crossbeam;

[0023] The drive assembly is disposed on the rear side wall of the crossbeam, and the drive assembly includes a second drive motor, a lead screw, and a nut;

[0024] The auxiliary rack has an engaging portion and a mounting portion. The engaging portion is located on the front side of the mounting plate, and the mounting portion passes through the mounting plate and the crossbeam and is connected to the nut of the drive assembly.

[0025] Furthermore, the mounting plate has a support platform below the mounting part corresponding to the auxiliary rack, and a row of needle rollers is provided on the contact surface between the auxiliary rack and the support platform.

[0026] Furthermore, the area between the two meshing portions of the auxiliary rack is a gap region, and the ends of the meshing portions near the gap region are inclined tooth surfaces.

[0027] Furthermore, it also includes a lubrication assembly, which includes a lubrication gear, a gear shaft, and an oil supply assembly;

[0028] One end of the gear shaft is fixedly disposed, and the lubrication gear is rotatably disposed at the other end of the gear shaft, and the lubrication gear meshes with the main rack;

[0029] The gear shaft has an axially spaced oil supply hole at its center. The mounting shaft section of the gear shaft and the lubrication gear has an annular groove. The annular groove has a plurality of oil distribution holes communicating with the oil supply hole in the radial direction. The lubrication gear has a plurality of through holes communicating with the annular groove in the radial direction.

[0030] The present invention also provides a dual-tool-changing chain-type tool magazine, comprising two independently configured tool-changing mechanisms, both of which employ the backlash-eliminating transmission device for tool-changing mechanisms.

[0031] The technical solution of this invention can achieve the following technical effects:

[0032] This invention, by setting an auxiliary rack, can compensate for the gear's drive within the reversing backlash zone, filling the tooth backlash, eliminating transmission delay and reversing impact, and achieving reversing transmission without backlash, impact, or transmission lag. Furthermore, the auxiliary rack and gear only mesh within the backlash elimination zone and automatically disengage during normal linear movement, without affecting the normal transmission of the main rack. This ensures both the response speed and positioning accuracy of the tool changing mechanism's reciprocating motion and improves transmission smoothness and operational reliability. Attached Figure Description

[0033] Figure 1A three-dimensional structural view of the backlash-free transmission device for the tool changing mechanism;

[0034] Figure 2 Top view of the backlash-free transmission device for the tool changing mechanism;

[0035] Figure 3 This is a schematic diagram of the meshing of the gear and the main rack;

[0036] Figure 4 A schematic diagram of the installation of the main rack and auxiliary rack on the mounting plate;

[0037] Figure 5 This is a schematic diagram of the drive component.

[0038] Figure 6 The diagram shows the meshing transmission between the gear and the main rack, and between the auxiliary rack and the gear, as well as enlarged views of points I and II.

[0039] Figure 7 This is a schematic diagram showing the installation of the first drive motor and the hollow vertical beam on the transverse plate;

[0040] Figure 8 This is a schematic diagram showing the installation of the needle roller array on the auxiliary rack.

[0041] Figure 9 for Figure 1 A magnified view of a portion at point A;

[0042] Figure 10 This is a cross-sectional schematic diagram of the lubrication assembly.

[0043] Reference numerals: 01, crossbeam; 02, tool changing mechanism; 1, first linear assembly; 11, main rack; 12, gear; 13, auxiliary rack; 14, drive assembly; 15, first drive motor; 2, transverse plate; 3, hollow vertical beam; 4, second linear assembly; 41, cylinder; 42, drive block; 5, guide rail assembly; 6, slide plate; 7, adjusting bolt; 8, mounting plate; 8a, support platform; 9, needle roller array; 10, lubrication assembly; 101, lubrication gear; 101a, through hole; 102, gear shaft; 102a, oil supply hole; 102b, annular groove; 102c, oil distribution hole; 103, oil supply assembly. Detailed Implementation

[0044] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments.

[0045] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used in this specification is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0046] like Figure 1-10 As shown, this application provides a backlash-free transmission device for a tool changing mechanism, including a first linear component 1 disposed between a crossbeam 01 of the frame and a tool changing mechanism 02, for driving the tool changing mechanism 02 to move along the length direction of the crossbeam 01 to the tool changing point; the first linear component 1 includes a main rack 11, a gear 12 and an auxiliary rack 13;

[0047] The main rack 11 is fixedly mounted on the side wall of the crossbeam 01, and its lower surface is provided with meshing teeth;

[0048] Gear 12 is rotatably mounted on tool changing mechanism 02 and meshes with main rack 11;

[0049] The auxiliary rack 13 is located below the gear 12. The meshing parts of the auxiliary rack 13 at both ends of its length direction are respectively located on both sides of the gear 12. The auxiliary rack 13 is installed on the crossbeam 01 through the drive assembly 14 and can be driven by the drive assembly 14 to reciprocate along the length direction of the main rack 11.

[0050] When gear 12 meshes with main rack 11, auxiliary rack 13 moves synchronously with gear 12 under the drive of drive assembly 14, and the meshing parts at both ends remain disengaged from gear 12 and do not contact it.

[0051] When the tool changing mechanism 02 moves to the tool changing point, the gear 12 stops rotating, and the drive assembly 14 continues to drive the auxiliary rack 13. The meshing part at one end pushes the gear 12 to produce linear movement, which is used to fill the tooth backlash between the gear 12 and the main rack 11.

[0052] Specifically, taking the forward direction of gear 12 as a reference, the front sidewall of a single tooth of gear 12 along the forward direction is defined as the front wall, and the rear sidewall is defined as the rear wall.

[0053] like Figure 6 As shown, when gear 12 rotates in the reverse direction, gear 12 only meshes with main rack 11. Gear 12 drives tool changing mechanism 02 to move in the first direction. The transmission load is borne by main rack 11. At this time, the rear wall of the tooth groove of main rack 11 is in contact with the rear wall of the tooth of gear 12. Auxiliary rack 13 moves synchronously with gear 12 under the action of drive assembly 14. The meshing parts at both ends of auxiliary rack 13 are disengaged from gear 12 and do not participate in meshing transmission.

[0054] When gear 12 drives tool changer 02 to a position close to the tool change point, gear 12 stops rotating. Drive assembly 14 continues to drive auxiliary rack 13 to move until the left meshing part of auxiliary rack 13 engages with one tooth wall of gear 12. Then, auxiliary rack 13 continues to move and drives gear 12 to make a slight movement in the first direction, causing the front wall of gear 12's tooth to momentarily engage with the front wall of the tooth groove, filling the tooth flank gap between gear 12 and main rack 11. Subsequently, drive assembly 14 drives auxiliary rack 13 to continue moving. At this time, gear 12, driven by auxiliary rack 13, passively reverses and moves in the first direction. During this process, the front wall of gear 12's tooth and the front wall of the tooth groove of main rack 11 remain engaged until tool changer 02 moves to the tool change point position corresponding to the spindle or tool magazine. In the above driving process, stopping early near the tool change point and driving gear 12 by switching auxiliary rack 13 ensures the accuracy of the tool change point position of tool changer 02.

[0055] When gear 12 switches from reverse to forward rotation, the tool changing mechanism 02 can immediately generate displacement. At the same time, the drive assembly 14 drives the auxiliary rack 13 to move in the reverse direction until the left meshing part is disengaged from gear 12. After that, the auxiliary rack 13 continues to move synchronously with gear 12 under the drive assembly 14, and the transmission load is still borne by the main rack 11.

[0056] By setting an auxiliary rack 13, the present invention can compensate for the drive of the gear 12 in the reversing clearance zone, fill the tooth backlash, eliminate transmission delay and reversing impact, and realize reversing transmission without backlash, impact and transmission lag; and the auxiliary rack 13 and the gear 12 only mesh in the backlash elimination zone, and automatically disengage during normal linear movement, without affecting the normal transmission of the main rack 11, which not only ensures the response speed and positioning accuracy of the reciprocating motion of the tool changing mechanism 02, but also improves the transmission smoothness and working reliability.

[0057] In this invention, the tool changing mechanism 02 and the first linear component 1 are slidably mounted on the crossbeam 01 via the transverse plate 2; the first linear component 1 is mounted on the inner wall of the transverse plate 2 facing the crossbeam 01.

[0058] The first linear component 1 also includes a first drive motor 15, which and the tool changing mechanism 02 are respectively disposed at both ends of the outer wall of the transverse plate 2 along the moving direction of the gear 12. This layout allows for a more balanced weight distribution of the transverse plate 2, effectively reducing off-center loading, swaying, and tilting during movement, and improving the smoothness and positioning accuracy of the tool changing mechanism 02. Simultaneously, this layout fully utilizes the structural space of the transverse plate 2, ensuring that the first drive motor 15, gear 12, rack, and other transmission components do not interfere with the tool changing mechanism 02, facilitating assembly, debugging, and subsequent maintenance. It also helps reduce the overall lateral dimensions of the device, making the structure more compact and the layout more rational.

[0059] Based on the above driving form, preferably, the first drive motor 15 is an asynchronous motor or a stepper motor. After the first drive motor 15 stops working, its output shaft can rotate freely and does not have a forced locking function. When the gear 12 has no active rotational power, the meshing part of the auxiliary rack 13 can drive the gear 12 to achieve passive rotation. It should be noted that, due to the certain rotational resistance of the output shaft of the first drive motor 15 and the transmission mechanism, the gear 12 does not rotate on its own initially, but only moves slightly along the length direction of the main rack 11 with the tool changing mechanism 02 until the teeth of the gear 12 are completely engaged with the tooth grooves of the main rack 11 and the tooth backlash is eliminated. After the backlash is eliminated, the auxiliary rack 13 continues to move, which can smoothly drive the gear 12 to rotate passively, thereby driving the tool changing mechanism 02 to move precisely to the tool changing point.

[0060] Alternatively, the tool changing mechanism 02 can be moved to the tool changing point position by directly meshing the gear 12 with the main rack 11. First, the auxiliary rack 13 drives the gear 12 to move a small distance to achieve tooth backlash compensation. Since the tool changing mechanism 02 stops at a position beyond the tool changing point, the reverse drive of the gear 12 is then used to return the tool changing mechanism 02 to the tool changing point position. In this driving method, the drive motor used by the gear 12 must have a forced locking function, and the specific selection of the motor depends on the actual needs.

[0061] In conjunction with the structure of the chain-type tool magazine, if the tool changing arm adopts a translational tool-locking method, as a preferred embodiment, a hollow vertical beam 3 is provided between the tool changing mechanism 02 and the transverse plate 2; the hollow vertical beam 3 is provided with a second linear component 4 for driving the tool changing mechanism 02 to move up and down in the vertical direction; preferably, the second linear component 4 includes a cylinder 41 and a drive block 42 disposed on the tool changing mechanism 02; the drive end of the cylinder 41 is connected to the drive block 42, and the cylinder 41 is installed in the hollow cavity of the hollow vertical beam 3.

[0062] By utilizing the internal space of the hollow vertical beam 3 to arrange the second linear component 4, the vertical lifting and locking function of the tool changing mechanism 02 can be realized without occupying additional horizontal installation space, making the overall device smaller and the layout simpler, and providing protection for the internal linear components.

[0063] Based on the above scheme, guide rail assemblies 5 are provided between the transverse plate 2 and the crossbeam 01, and between the tool changing mechanism 02 and the vertical beam. These assemblies can accurately guide and constrain the horizontal movement of the transverse plate 2 and the vertical lifting movement of the tool changing mechanism 02, effectively reducing swaying, wobbling and jamming during the movement, and improving the stability and positioning accuracy of the tool changing mechanism 02 in the horizontal and vertical directions. At the same time, they can reduce uneven force and wear on the transmission components, and improve the overall operational reliability and service life of the device.

[0064] To ensure the meshing accuracy of gear 12 with main rack 11 and auxiliary rack 13, preferably, the first drive motor 15 is mounted on the transverse plate 2 via a slide plate 6; the transverse plate 2 has a groove, the slide plate 6 is embedded in the groove, and adjusting bolts 7 are provided on the top and bottom surfaces of the slide plate 6. The two adjusting bolts 7 are used to adjust the vertical position of the slide plate 6 in the groove, thereby adjusting the meshing position of gear 12 between main rack 11 and auxiliary rack 13.

[0065] In a preferred embodiment of the present invention, a mounting plate 8 is provided on the front side wall of the crossbeam 01, and the main rack 11 is fixedly mounted on the side wall of the mounting plate 8 away from the crossbeam 01; the drive assembly 14 is provided on the rear side wall of the crossbeam 01, and the drive assembly 14 includes a second drive motor, a lead screw, and a nut; the auxiliary rack 13 has a meshing part and a mounting part, the meshing part is located on the front side of the mounting plate 8, and the mounting part passes through the mounting plate 8 and the crossbeam 01 and is connected to the nut of the drive assembly 14. The second drive motor is a servo motor, which, together with the lead screw and nut, drives the auxiliary rack 13, resulting in high transmission accuracy, fast response, and smooth operation. It can accurately control the micro-motion and displacement of the auxiliary rack 13, ensuring reliable backlash elimination.

[0066] As a preferred embodiment of the present invention, the mounting plate 8 is provided with a support 8a below the mounting part of the corresponding auxiliary rack 13, and a needle roller row 9 is provided on the contact surface between the auxiliary rack 13 and the support 8a.

[0067] By setting a support platform 8a on the mounting plate 8 and setting a needle roller row 9 between the auxiliary rack 13 and the support platform 8a, a stable support can be formed for the auxiliary rack 13, effectively preventing the auxiliary rack 13 from sagging or swaying due to its own weight or force, and ensuring the meshing accuracy between the auxiliary rack 13 and the gear 12; at the same time, the needle roller row 9 can convert the sliding friction during the movement of the auxiliary rack 13 into rolling friction, significantly reducing frictional resistance and wear, making the micro-movement of the auxiliary rack 13 more sensitive and smooth, improving the response speed and transmission stability of the backlash elimination action, and extending the service life of the device.

[0068] In this invention, the area between the meshing portions at both ends of the auxiliary rack 13 is a neutral zone, which ensures that the gear 12 remains disengaged from the auxiliary rack 13 during normal transmission and when it follows the main rack 11, avoiding unnecessary interference between the meshing portion and the gear 12 and ensuring the smoothness of the main transmission process. More preferably, the ends of the meshing portions near the neutral zone at both ends are inclined tooth surfaces, which can play a guiding role when the auxiliary rack 13 pushes the gear 12 to make micro-movements and achieve meshing and backlash elimination, so that the meshing portion and the tooth surface of the gear 12 are smoothly fitted, avoiding tooth surface collision and jamming, further reducing the reversing impact, while improving the response speed and operation reliability of meshing and backlash elimination, reducing tooth surface wear, and extending the service life of the auxiliary rack 13 and the gear 12.

[0069] In another preferred embodiment, the meshing portions of the auxiliary rack 13 at both ends are separate, and the distance between the two meshing portions can be adjusted. The distance between the meshing portions can be flexibly adjusted according to the pitch circle diameter of different specifications of gears 12, so that the meshing position and backlash elimination range of the auxiliary rack 13 and gears 12 can be adaptively adjusted.

[0070] In this invention, corresponding to the position of the main rack 11, the transverse plate 2 also includes a lubrication assembly 10, which includes a lubrication gear 101, a gear 12 shaft, and an oil supply assembly 103. One end of the gear 12 shaft is fixedly mounted on the transverse plate 2, and the lubrication gear 101 is rotatably mounted on the other end of the gear 12 shaft, and the lubrication gear 101 meshes with the main rack 11. The center of the gear 12 shaft is provided with an oil supply hole 102a along the axial direction, and the mounting shaft section of the gear 12 shaft and the lubrication gear 101 is provided with an annular groove 102b. The annular groove 102b is provided with a plurality of oil distribution holes 102c communicating with the oil supply hole 102a along the radial direction, and the lubrication gear 101 is provided with a plurality of through holes 101a communicating with the annular groove 102b along the radial direction.

[0071] The lubricating oil supplied by the oil supply assembly 103 enters the annular groove 102b through the oil supply hole 102a and multiple oil distribution holes 102c. Then, through the radial through hole 101a on the lubricating gear 101 corresponding to the annular groove 102b, the lubricating oil is precisely delivered to the meshing tooth surface of the lubricating gear 101 and the main rack 11, achieving comprehensive and uniform coverage of the lubricating fluid. Moreover, the lubricating gear 101 meshes and rotates synchronously with the main rack 11, which can drive the lubricating oil to be evenly coated on the entire meshing tooth surface of the main rack 11. This ensures that the main rack 11 and the gear 12 can obtain reliable lubrication throughout the entire transmission and backlash elimination process, eliminating the need for frequent manual addition of lubricating oil, reducing equipment maintenance costs, and further improving the operational reliability and stability of the device.

[0072] The present invention also provides a dual-tool-changing chain tool magazine, which includes two independently configured tool-changing mechanisms 02, both of which adopt a backlash-free transmission device.

[0073] The two tool changing mechanisms 02, through their respective backlash elimination transmission devices, realize horizontal movement along the crossbeam 01 and vertical lifting along the vertical beam, respectively, and can independently complete the tool transfer action between the tool magazine tool changing point and the spindle tool changing point. Moreover, both tool changing mechanisms 02 are equipped with backlash elimination transmission devices, which can effectively eliminate tooth backlash during the meshing process of gear 12 and rack, avoid problems such as motion delay and tooth surface impact when the tool changing mechanism 02 moves, and ensure the smooth movement and positioning accuracy of the two tool changing mechanisms 02.

[0074] Although this application has been described in conjunction with specific features and embodiments, it is obvious that various modifications and combinations can be made thereto without departing from the spirit and scope of this application. Accordingly, this specification and drawings are merely exemplary illustrations of the application as defined herein, and are to be considered as covering any and all modifications, variations, combinations, or equivalents within the scope of this application. Clearly, those skilled in the art can make various alterations and modifications to this application without departing from its scope. Thus, if such modifications and modifications fall within the scope of this application and its equivalents, this application intends to include such modifications and modifications.

Claims

1. A backlash-free transmission device for a tool changing mechanism, characterized in that, This includes a first linear component disposed between the crossbeam of the frame and the tool changing mechanism, for driving the tool changing mechanism to move along the length of the crossbeam to the tool changing point. The first linear component includes: The main rack is fixedly mounted on the side wall of the crossbeam, and its lower surface is provided with meshing teeth; The gear is rotatably mounted on the tool changing mechanism and meshes with the main rack; An auxiliary rack is disposed below the gear, with the meshing portions of the auxiliary rack at both ends along its length direction corresponding to the two sides of the gear, and the auxiliary rack is mounted on the crossbeam via a drive assembly; When the gear meshes with the main rack, the auxiliary rack moves synchronously with the gear under the drive of the drive assembly, and the meshing parts at both ends remain disengaged from the gear and do not contact it. When the tool changing mechanism moves to the tool changing point, the gear stops rotating, and the drive assembly continues to drive the meshing part at one end of the auxiliary rack to push the gear to make linear movement, which is used to fill the tooth backlash between the gear and the main rack. The front side wall of the crossbeam is provided with a mounting plate, and the main rack is fixedly installed on the side wall of the mounting plate away from the crossbeam; The drive assembly is disposed on the rear side wall of the crossbeam, and the drive assembly includes a second drive motor, a lead screw, and a nut; The auxiliary rack has an engaging part and a mounting part. The engaging part is located on the front side of the mounting plate, and the mounting part passes through the mounting plate and the crossbeam and is connected to the nut of the drive assembly. The mounting plate has a support platform below the mounting part corresponding to the auxiliary rack, and a row of needle rollers is provided on the contact surface between the auxiliary rack and the support platform; The auxiliary rack has a gap area between its two meshing parts, and the ends of the meshing parts near the gap area are inclined tooth surfaces.

2. The backlash-free transmission device for the tool changing mechanism according to claim 1, characterized in that, The tool changing mechanism and the first linear component are slidably mounted on the crossbeam via a transverse plate; The first linear component is disposed on the inner sidewall of the transverse plate facing the crossbeam; The first linear component further includes a first drive motor, which and the tool changing mechanism are respectively disposed at both ends of the outer side wall of the transverse plate along the gear moving direction.

3. The backlash-free transmission device for the tool changing mechanism according to claim 2, characterized in that, A hollow vertical beam is provided between the tool changing mechanism and the transverse plate; The hollow vertical beam is equipped with a second linear component for driving the tool changing mechanism to move up and down in the vertical direction; The second linear component includes a cylinder and a drive block disposed on the tool changing mechanism; the drive end of the cylinder is connected to the drive block, and the cylinder is installed in the hollow cavity of the hollow vertical beam.

4. The backlash-free transmission device for the tool changing mechanism according to claim 3, characterized in that, Guide rail assemblies are provided between the transverse plate and the crossbeam, and between the tool changing mechanism and the vertical beam.

5. The backlash-free transmission device for the tool changing mechanism according to claim 2, characterized in that, The first drive motor is mounted on the transverse plate via a sliding plate; The transverse plate has a groove, and the slide plate is embedded in the groove. Adjusting bolts are provided on the top and bottom surfaces of the slide plate. The two adjusting bolts are used to adjust the vertical position of the slide plate in the groove, thereby adjusting the meshing position of the gear between the main rack and the auxiliary rack.

6. The backlash-free transmission device for the tool changing mechanism according to claim 1, characterized in that, It also includes a lubrication assembly, which includes a lubrication gear, a gear shaft, and an oil supply assembly; One end of the gear shaft is fixedly disposed, and the lubrication gear is rotatably disposed at the other end of the gear shaft, and the lubrication gear meshes with the main rack; The gear shaft has an axially spaced oil supply hole at its center. The mounting shaft section of the gear shaft and the lubrication gear has an annular groove. The annular groove has a plurality of oil distribution holes communicating with the oil supply hole in the radial direction. The lubrication gear has a plurality of through holes communicating with the annular groove in the radial direction.

7. A dual-tool-changing chain-type tool magazine, characterized in that, It includes two independently configured tool changing mechanisms, both of which employ a backlash-free transmission device for tool changing mechanisms as described in any one of claims 1-6.

Images