Rack transmission system with backlash eliminating function

Abstract

The utility model discloses a rack transmission system with a backlash eliminating function, which comprises a rack and a rack driving module, and the rack driving module comprises a motor module and a backlash eliminating module; the rack is horizontally arranged; the motor module comprises a transmission motor and a double-shaft transmission part; the transmission motor faces the rack and is arranged on one side of the rack. The transmission motor is perpendicular to the rack in the horizontal direction. A main shaft of the transmission motor is positioned above the rack; the double-shaft transmission part is arranged corresponding to a main shaft of the transmission motor, and a first transmission end and a second transmission end are arranged on the double-shaft transmission part; the first transmission end is connected to a main shaft of the transmission motor, and the second transmission end of the double-shaft transmission part is in transmission connection with the rack; the anti-backlash module is obliquely arranged above the second transmission end, and one end of the anti-backlash module abuts against the second transmission end; through the design of the double-shaft transmission part and the anti-backlash module, the meshing degree between the transmission gear and the rack is increased, and the structural stability is high.

Description

Technical Field

[0001] The utility model relates to the technical field of transmission equipment, in particular to a rack transmission system with a backlash elimination function. Background Art

[0002] A motor and rack are a common combination in mechanical transmission systems, used to achieve precise linear motion. However, when backlash exists in the motor-rack system, it can cause a series of problems that affect the performance and accuracy of the system, as follows:

[0003] (1) Reduced motion accuracy: Tooth clearance will cause the motor to produce lost motion error when driving the rack. That is, after the motor rotates a certain angle, the rack does not move immediately, but only starts to move when the gear meshes with the next tooth of the rack. This lost motion error will significantly reduce the motion accuracy of the system.

[0004] (2) Vibration and noise: Tooth clearance can also cause vibration and noise in the system. When the gear and rack are meshing, the existence of tooth clearance will cause impact and collision, resulting in vibration and noise. This not only affects the stability of the system, but may also interfere with the surrounding environment.

[0005] (3) Increased wear: Tooth clearance will also increase the wear of gears and racks; due to the existence of tooth clearance, gears and racks will produce additional friction and wear when meshing, resulting in shortened part life and the need for more frequent replacement and maintenance.

[0006] (4) Inaccurate positioning: In applications that require precise positioning, tooth backlash can lead to inaccurate positioning. Due to the existence of backlash error, the rack may not stay in the expected position after the motor stops rotating, thereby affecting the positioning accuracy of the system.

[0007] Existing backlash elimination methods usually eliminate backlash by adjusting the relative position of the gear and rack; however, this method increases the complexity and cost of the system and may introduce new motion errors; another existing solution is to eliminate backlash by controlling the current or voltage of the motor. This method can achieve higher accuracy and stability, but requires precise control and calibration of the motor; however, electrical backlash elimination may be affected by motor performance, load changes, and environmental factors, resulting in unstable backlash elimination or difficulty in achieving the ideal state.

[0008] In summary, the existence of tooth clearance in the motor rack system will lead to defects such as reduced motion accuracy, increased vibration and noise, increased wear and inaccurate positioning; and although the existing tooth clearance elimination solutions can solve the problem to a certain extent, they all have their own shortcomings. Utility Model Content

[0009] The main purpose of the present invention is to provide a rack transmission system with a backlash elimination function, thereby solving all or one of the above problems existing in the prior art.

[0010] In order to solve the above technical problems, the present invention adopts a technical solution: to provide a rack transmission system with a backlash elimination function, comprising:

[0011] Rack and rack drive module, the rack drive module includes: a motor module and an anti-backlash module;

[0012] The rack is arranged horizontally;

[0013] The motor module includes: a transmission motor and a dual-axis transmission part; the transmission motor faces the rack and is arranged on one side of the rack, and the transmission motor is arranged perpendicular to the rack in the horizontal direction; the main shaft of the transmission motor is located above the rack; the dual-axis transmission part is arranged corresponding to the main shaft of the transmission motor, and the dual-axis transmission part is provided with a first transmission end and a second transmission end; the first transmission end is connected to the main shaft of the transmission motor, and the second transmission end of the dual-axis transmission part is transmission-connected to the rack;

[0014] The backlash-eliminating module is obliquely arranged above the second transmission end, and one end of the backlash-eliminating module abuts against the second transmission end.

[0015] As an improved solution, the motor module further includes: a first bearing seat;

[0016] The first bearing seat is arranged at the other side of the rack relative to the transmission motor, and the first bearing seat is arranged corresponding to the main shaft of the transmission motor.

[0017] As an improved solution, the dual-shaft transmission unit includes: a first transmission bearing group and a second transmission bearing group; the first transmission bearing group is the first transmission end, and the second transmission bearing group is the second transmission end;

[0018] The first transmission bearing group and the second transmission bearing group are arranged close to each other, and the first transmission bearing group is arranged between the main shaft of the transmission motor and the first bearing seat, and the two ends of the first transmission bearing group are respectively connected to the main shaft of the transmission motor and the first bearing seat; the second transmission bearing group is arranged at a lower position on one side of the first transmission bearing group, and one end of the second transmission bearing group is respectively connected to the second transmission bearing group and the rack.

[0019] As an improved solution, the first transmission bearing group and the second transmission bearing group have the same structure, and both include: a bearing sleeve, a transmission bearing, a transmission gear and a transmission shaft;

[0020] The bearing sleeve is arranged parallel to the main shaft of the transmission motor, and the transmission bearing is rotatably installed in the bearing sleeve. The transmission shaft is fixed in the shaft hole of the transmission bearing parallel to the main shaft of the transmission motor. The transmission shaft extends out of the transmission bearing away from the end of the transmission motor. The transmission gear is fixedly sleeved at the end of the transmission shaft and corresponds to the position of the rack.

[0021] As an improved solution, the main shaft of the transmission motor and the transmission shaft of the first transmission bearing group are coaxially arranged, and the main shaft of the transmission motor and the transmission shaft of the first transmission bearing group are connected by a coupling;

[0022] The end of the transmission shaft of the first transmission bearing assembly extends to the first bearing seat and is rotatably connected to the first bearing seat.

[0023] As an improved solution, the transmission gear of the first transmission bearing group and the transmission gear of the second transmission bearing group are arranged corresponding to each other, and the transmission gear of the first transmission bearing group is meshed with the transmission gear of the second transmission bearing group;

[0024] The transmission gear of the second transmission bearing group is meshed with the rack.

[0025] As an improved solution, the tooth surface of the rack is arranged upward, and the tooth surface of the rack adopts a diagonal tooth surface;

[0026] The transmission gear of the first transmission bearing group and the transmission gear of the second transmission bearing group are both helical gears;

[0027] The tooth pattern direction of the transmission gear of the first transmission bearing group is the same as the tooth pattern direction of the rack, and the tooth pattern direction of the transmission gear of the second transmission bearing group is opposite to that of the rack.

[0028] As an improved solution, the anti-backlash module includes: a protective shell and an anti-backlash rod installed on the protective shell;

[0029] The protective shell is provided outside the first transmission bearing group and the second transmission bearing group, and a mounting hole is provided on the protective shell at a position obliquely above the second transmission bearing group;

[0030] The anti-backlash rod is obliquely inserted into the mounting hole from top to bottom, and the lower end of the anti-backlash rod abuts against the outer surface of the bearing sleeve of the second transmission bearing group, and the upper end of the anti-backlash rod is connected to the protective shell at the edge of the mounting hole.

[0031] As an improved solution, there are two anti-backlash rods, and the two anti-backlash rods are arranged side by side and close to each other;

[0032] The two anti-backlash rods are both arranged perpendicular to the horizontal plane where the mounting hole is located;

[0033] The lower ends of the two anti-backlash rods are rotatably connected to anti-slip wheels, which are arranged parallel to the second transmission bearing group, and the bottoms of the anti-slip wheels abut against the outer surface of the bearing sleeve of the second transmission bearing group.

[0034] As an improved solution, the bearing sleeve of the first transmission bearing group and the bearing sleeve of the second transmission bearing group are designed as one piece.

[0035] The beneficial effects of the utility model are:

[0036] The rack transmission system with a tooth clearance elimination function described in the utility model can increase the meshing degree between the transmission gear and the rack, improve the meshing stability and meshing accuracy between the transmission gear and the rack, and eliminate the tooth clearance between the transmission gear and the rack through the design of a dual-axis transmission part and a backlash elimination module. The structure has strong stability and is easy to produce. The backlash elimination precision of the backlash elimination module is high, and it supports flexible adjustment of the backlash elimination degree, and has high application value. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] Figure 1 This is a schematic diagram of the three-dimensional structure of a rack transmission system with a backlash elimination function in an embodiment of the present utility model;

[0038] Figure 2 This is a schematic diagram of the three-dimensional structure of a rack transmission system with a backlash elimination function in an embodiment of the present utility model from another perspective;

[0039] Figure 3 This is a schematic diagram of the three-dimensional structure of a rack transmission system with a backlash elimination function in an embodiment of the present utility model after the protective shell is removed;

[0040] Figure 4 This is a schematic diagram of the three-dimensional structure of a rack transmission system with a backlash elimination function in an embodiment of the present invention after removing the protective shell and part of the rack;

[0041] Figure 5 This is a schematic diagram of the three-dimensional structure of a rack transmission system with a backlash elimination function in an embodiment of the present invention, after removing the protective shell and part of the rack from another perspective;

[0042] Figure 6This is a schematic diagram of the three-dimensional structure of a rack transmission system with a backlash elimination function in an embodiment of the present invention, after removing the protective shell and part of the rack from another perspective;

[0043] The markings of the components in the accompanying drawings are as follows:

[0044] 101. rack; 102. transmission motor; 103. first bearing seat;

[0045] 201, first transmission bearing group; 202, second transmission bearing group; 203, bearing sleeve; 204, transmission bearing; 205, first transmission gear; 206, second transmission gear;

[0046] 301. Protective shell; 302. Anti-backlash rod; 303. Anti-slip wheel; 304. Threaded sleeve; 305. Limit nut; 401. Cleaning gear; 402. Gear mounting bracket. DETAILED DESCRIPTION

[0047] The preferred embodiments of the present invention are described in detail below in conjunction with the accompanying drawings so that the advantages and features of the present invention can be more easily understood by those skilled in the art, thereby making a clearer and more precise definition of the protection scope of the present invention.

[0048] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like to indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation to the present invention.

[0049] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of the technical features being referred to. Thus, a feature specified as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of this utility model, "plurality" means at least two, such as two, three, etc., unless otherwise specifically defined.

[0050] In this utility model, unless otherwise specified or limited, the terms "installed," "connected," "connect," "fixed," etc. should be understood in a broad sense. For example, they can refer to fixed connection, detachable connection, or integration; mechanical connection, electrical connection; direct connection, or indirect connection through an intermediate medium; internal communication between two components, or interaction between two components, unless otherwise specified. Those skilled in the art will understand the specific meanings of the above terms in this utility model based on specific circumstances.

[0051] In the present invention, unless otherwise expressly specified or limited, when a first feature is "above" or "below" a second feature, it may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediary. Furthermore, when a first feature is "above," "above," or "above" a second feature, it may mean that the first feature is directly above or diagonally above the second feature, or simply means that the first feature is at a higher level than the second feature. When a first feature is "below," "below," or "below" a second feature, it may mean that the first feature is directly below or diagonally below the second feature, or simply means that the first feature is at a lower level than the second feature.

[0052] It should be noted that when an element is referred to as being "fixed to" or "disposed on" another element, it may be directly on the other element or there may be an intermediate element. When an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be an intermediate element. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and similar expressions used herein are for illustrative purposes only and do not represent the only embodiments.

[0053] See also Figures 1 to 6 , the embodiments of the present utility model include:

[0054] A rack transmission system with a backlash elimination function includes: a rack 101 and a rack drive module, the rack drive module including: a motor module and an anti-backlash module; the rack 101 is horizontally arranged; the motor module includes: a transmission motor 102 and a dual-axis transmission part; the transmission motor 102 faces the rack 101 and is arranged on one side of the rack 101, and the transmission motor 102 is arranged perpendicular to the rack 101 in the horizontal direction; the main shaft of the transmission motor 102 is located above the rack 101; the dual-axis transmission part is arranged corresponding to the main shaft of the transmission motor 102, and the dual-axis transmission part is provided with a first transmission end and a second transmission end; the first transmission end is connected to the main shaft of the transmission motor 102, and the second transmission end of the dual-axis transmission part is transmission-connected to the rack 101; the anti-backlash module is obliquely arranged above the second transmission end, and one end of the anti-backlash module abuts against the second transmission end.

[0055] As an embodiment of the present invention, the motor module further includes: a first bearing seat 103; the first bearing seat 103 is arranged at the other side of the rack 101 relative to the transmission motor 102, such as Figure 1 As shown, the first bearing seat 103 and the transmission motor 102 are respectively arranged on the left and right sides of the rack 101 near the upper position, and the first bearing seat 103 is arranged corresponding to the main shaft of the transmission motor 102.

[0056] As an embodiment of the present invention, the dual-axis transmission part includes: a first transmission bearing group 201 and a second transmission bearing group 202; the first transmission bearing group 201 is the first transmission end, and the second transmission bearing group 202 is the second transmission end; the first transmission bearing group 201 and the second transmission bearing group 202 are arranged close to each other, the first transmission bearing group 201 is arranged at a position corresponding to the first bearing seat 103 obliquely above the second transmission bearing group 202, and the first transmission bearing group 201 is arranged between the main shaft of the transmission motor 102 and the first bearing seat 103, and the two ends of the first transmission bearing group 201 are respectively connected to the main shaft of the transmission motor 102 and the first bearing seat 103 transmission connection; the second transmission bearing group 202 is arranged at a lower position on one side of the first transmission bearing group 201, and one end of the second transmission bearing group 202 is respectively connected to the second transmission bearing group 202 and the rack 101 for transmission; specifically, the first transmission bearing group 201 and the second transmission bearing group 202 have the same structure and both include: a bearing sleeve 203, a transmission bearing 204, a transmission gear and a transmission shaft; the bearing sleeve 203 is arranged parallel to the main shaft of the transmission motor 102, and the transmission bearing 204 is rotatably installed in the bearing sleeve 203, and the transmission shaft is fixed in the shaft hole of the transmission bearing 204 parallel to the main shaft of the transmission motor 102, and the transmission shaft is away from The end of the transmission motor 102, that is, its left end, extends out of the transmission bearing 204, and the transmission gear is fixedly sleeved on the end of the transmission shaft and corresponds to the position of the rack 101; in order to achieve a better transmission effect, the main shaft of the transmission motor 102 and the transmission shaft of the first transmission bearing group 201 are coaxially arranged, and the main shaft of the transmission motor 102 and the right end of the transmission shaft of the first transmission bearing group 201 are connected through a coupling; the left end of the transmission shaft of the first transmission bearing group 201 extends to the first bearing seat 103 and is rotatably connected to the shaft hole of the bearing in the first bearing seat 103; the transmission gear of the first transmission bearing group 201 and the second transmission shaft The transmission gears of the bearing group 202 are arranged corresponding to each other, and the transmission gear of the first transmission bearing group 201 is meshed with the transmission gear of the second transmission bearing group 202; the transmission gear of the second transmission bearing group 202 is meshed with the rack 101; through the above design, when the transmission motor 102 is in operation, its main shaft drives the transmission shaft of the first transmission bearing group 201 to rotate, and then drives the transmission gear of the first transmission bearing group 201 to rotate with the transmission shaft of the first transmission bearing group 201 as the central axis, and then drives the transmission gear of the second transmission bearing group 202 to rotate with the transmission shaft of the second transmission bearing group 202 as the central axis, and realizes horizontal displacement under the meshing action of the rack 101;Specifically, to protect the transmission module, the first transmission bearing assembly 201 and the second transmission bearing assembly 202 are covered with a protective shell 301. The protective shell 301 has a mounting hole at a position obliquely above the second transmission bearing assembly 202 for mounting the anti-backlash module. Furthermore, the bearing sleeves 203 of the first transmission bearing assembly 201 and the bearing sleeves 203 of the second transmission bearing assembly 202 can be integral or separate.

[0057] As an embodiment of the present invention, the tooth surface of the rack 101 is arranged upward, and the tooth surface of the rack 101 adopts a helical tooth surface; the transmission gear of the first transmission bearing group 201 and the transmission gear of the second transmission bearing group 202 both adopt helical gears; the tooth pattern direction of the transmission gear of the first transmission bearing group 201 is the same as the tooth pattern direction of the rack 101, and the tooth pattern direction of the transmission gear of the second transmission bearing group 202 is opposite to that of the rack 101; Figure 6 As shown, the transmission gear of the first transmission bearing group 201 is the first transmission gear 205 , and the transmission gear of the second transmission bearing group 202 is 206 .

[0058] As an embodiment of the present invention, the anti-backlash module includes: the aforementioned protective shell 301 and two anti-backlash rods 302 installed on the protective shell 301; the two anti-backlash rods 302 are respectively obliquely inserted into the mounting holes from top to bottom, and the two anti-backlash rods 302 are arranged side by side and closely adjacent to each other; the two anti-backlash rods 302 are both arranged perpendicular to the horizontal plane where the mounting holes are located; the lower ends of the two anti-backlash rods 302 are rotatably connected to an anti-skid wheel 303, the anti-skid wheel 303 is arranged parallel to the second transmission bearing group 202, and the bottom of the anti-skid wheel 303 abuts against the outer surface of the bearing sleeve 203 of the second transmission bearing group 202; the mounting hole of the protective shell 301 is along the length direction of the two anti-backlash rods 302 Two threaded sleeves 304 are respectively connected, and the interior of the two threaded sleeves 304 is connected to the mounting holes. The upper ends of the two anti-backlash rods 302 are connected to the two threaded sleeves 304 by threads. The two anti-backlash rods 302 are fine-tuned by rotating up and down in the threaded sleeves 304 to achieve fine-tuning of the distance between the anti-skid wheels 303 at the lower ends of the two anti-backlash rods 302 and the outer surface of the bearing sleeve 203 of the second transmission bearing group 202, thereby achieving fine-tuning of the anti-backlash distance; the upper ends of the two anti-backlash rods 302 are both provided with limiting nuts 305, and the limiting nuts 305 are locked to fit tightly against the upper surface of the threaded sleeves 304, thereby achieving fixation of the position of the anti-backlash rods 302. After loosening the limiting nuts 305, the two anti-backlash rods 302 can be fine-tuned up and down in the threaded sleeves 304.

[0059] As an embodiment of the present invention, a cleaning gear 401 is provided on the right side near the second transmission bearing group 202, which is meshed with the transmission gear of the second transmission bearing group 202. The tooth pattern direction of the cleaning gear 401 is the same as the tooth pattern direction of the transmission gear of the second transmission bearing group 202. The cleaning gear 401 is rotatably mounted on the gear mounting frame 402, and its bottom is higher than the rack 101 and away from the transmission gear of the first transmission bearing group 201; the diameter of the cleaning gear 401 is much smaller than the diameter of the transmission gear of the second transmission bearing group 202, and it does not participate in the transmission process, but is only used to rotate along with the rotation of the transmission gear of the second transmission bearing group 202, thereby cleaning impurities between the tooth gaps of the transmission gear of the second transmission bearing group 202, thereby improving the clearance elimination and transmission precision.

[0060] As an embodiment of the present invention, the working principle of the device is as follows:

[0061] Before using this device, loosen the limiting nuts 305 at the upper ends of the two anti-backlash rods 302, and then rotate the two anti-backlash rods 302 in the threaded sleeve 304 to achieve fine-tuning of the up and down rotation of the two anti-backlash rods 302, thereby controlling the fine-tuning of the distance between the anti-slip wheels 303 at the lower ends of the two anti-backlash rods 302 and the outer surface of the bearing sleeve 203 of the second transmission bearing group 202, thereby achieving fine-tuning of the anti-backlash distance.

[0062] After the clearance elimination distance is adjusted, the transmission motor 102 is controlled to operate so that its main shaft drives the transmission shaft of the first transmission bearing group 201 to rotate, and then drives the transmission gear of the first transmission bearing group 201 to rotate with the transmission shaft of the first transmission bearing group 201 as the center axis, and then drives the transmission gear of the second transmission bearing group 202 to rotate with the transmission shaft of the second transmission bearing group 202 as the center axis, and finally realizes horizontal displacement under the meshing action of the rack 101.

[0063] The above description is merely an embodiment of the present invention and does not limit the patent scope of the present invention. Any equivalent structure made using the contents of the description and drawings of the present invention, or directly or indirectly applied in other related technical fields, is also included in the patent protection scope of the present invention.

Claims

1. A rack transmission system with backlash elimination function, characterized in that: include: A rack (101) and a rack drive module, wherein the rack drive module comprises: a motor module and an anti-backlash module; The rack (101) is arranged horizontally; The motor module comprises: a transmission motor (102) and a dual-axis transmission part; the transmission motor (102) faces the rack (101) and is arranged on one side of the rack (101), and the transmission motor (102) is arranged perpendicular to the rack (101) in the horizontal direction; the main shaft of the transmission motor (102) is located above the rack (101); the dual-axis transmission part is arranged corresponding to the main shaft of the transmission motor (102), and the dual-axis transmission part is provided with a first transmission end and a second transmission end; the first transmission end is connected to the main shaft of the transmission motor (102), and the second transmission end of the dual-axis transmission part is transmission-connected to the rack (101); The backlash-eliminating module is obliquely arranged above the second transmission end, and one end of the backlash-eliminating module abuts against the second transmission end.

2. The rack transmission system with backlash elimination function according to claim 1, characterized in that: The motor module further includes: a first bearing seat (103); The first bearing seat (103) is arranged at the other side of the rack (101) relative to the transmission motor (102), and the first bearing seat (103) is arranged corresponding to the main shaft of the transmission motor (102).

3. The rack transmission system with backlash elimination function according to claim 2, characterized in that: The dual-shaft transmission unit comprises a first transmission bearing group (201) and a second transmission bearing group (202); the first transmission bearing group (201) is the first transmission end, and the second transmission bearing group (202) is the second transmission end; The first transmission bearing group (201) and the second transmission bearing group (202) are arranged close to each other, and the first transmission bearing group (201) is arranged between the main shaft of the transmission motor (102) and the first bearing seat (103), and the two ends of the first transmission bearing group (201) are respectively connected to the main shaft of the transmission motor (102) and the first bearing seat (103); the second transmission bearing group (202) is arranged at a lower position on one side of the first transmission bearing group (201), and one end of the second transmission bearing group (202) is respectively connected to the second transmission bearing group (202) and the rack (101).

4. The rack transmission system with backlash elimination function according to claim 3, characterized in that: The first transmission bearing group (201) and the second transmission bearing group (202) have the same structure, and both include: a bearing sleeve (203), a transmission bearing (204), a transmission gear and a transmission shaft; The bearing sleeve (203) is arranged parallel to the main shaft of the transmission motor (102), and the transmission bearing (204) is rotatably installed in the bearing sleeve (203). The transmission shaft is fixed in the shaft hole of the transmission bearing (204) parallel to the main shaft of the transmission motor (102). The transmission shaft extends out of the transmission bearing (204) away from the end of the transmission motor (102). The transmission gear is fixedly sleeved at the end of the transmission shaft and corresponds to the position of the rack (101).

5. The rack transmission system with backlash elimination function according to claim 4, characterized in that: The main shaft of the transmission motor (102) and the transmission shaft of the first transmission bearing group (201) are coaxially arranged, and the main shaft of the transmission motor (102) and the transmission shaft of the first transmission bearing group (201) are connected in transmission via a coupling; The transmission shaft end of the first transmission bearing assembly (201) extends to the first bearing seat (103) and is rotatably connected to the first bearing seat (103).

6. The rack transmission system with backlash elimination function according to claim 5, characterized in that: The transmission gear of the first transmission bearing group (201) and the transmission gear of the second transmission bearing group (202) are arranged corresponding to each other, and the transmission gear of the first transmission bearing group (201) and the transmission gear of the second transmission bearing group (202) are meshed; The transmission gear of the second transmission bearing group (202) is meshed with the rack (101).

7. The rack transmission system with backlash elimination function according to claim 6, characterized in that: The tooth surface of the rack (101) is arranged upward, and the tooth surface of the rack (101) adopts a diagonal tooth surface; The transmission gear of the first transmission bearing group (201) and the transmission gear of the second transmission bearing group (202) are both helical gears; The tooth pattern direction of the transmission gear of the first transmission bearing group (201) is the same as the tooth pattern direction of the rack (101), and the tooth pattern direction of the transmission gear of the second transmission bearing group (202) is opposite to that of the rack (101).

8. The rack transmission system with backlash elimination function according to claim 4, characterized in that: The anti-backlash module comprises: a protective shell (301) and an anti-backlash rod (302) installed on the protective shell (301); The protective shell (301) is arranged outside the first transmission bearing group (201) and the second transmission bearing group (202), and a mounting hole is provided on the protective shell (301) at a position obliquely above the second transmission bearing group (202); The anti-backlash rod (302) is obliquely inserted into the mounting hole from top to bottom, and the lower end of the anti-backlash rod (302) abuts against the outer surface of the bearing sleeve (203) of the second transmission bearing group (202), and the upper end of the anti-backlash rod (302) is connected to the protective shell (301) at the edge of the mounting hole.

9. The rack transmission system with backlash elimination function according to claim 8, characterized in that: There are two anti-backlash rods (302), and the two anti-backlash rods (302) are arranged side by side and close to each other; The two anti-backlash rods (302) are both arranged perpendicular to the horizontal plane where the mounting hole is located; The lower ends of the two anti-backlash rods (302) are rotatably connected to anti-skid wheels (303), which are arranged parallel to the second transmission bearing group (202), and the bottoms of the anti-skid wheels (303) abut against the outer surface of the bearing sleeve (203) of the second transmission bearing group (202).

10. The rack transmission system with backlash elimination function according to claim 4, characterized in that: The bearing sleeve (203) of the first transmission bearing group (201) and the bearing sleeve (203) of the second transmission bearing group (202) are designed as one piece.

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