A method for adjusting zero backlash of double gear transmission

Abstract

The present invention discloses a double gear transmission zero backlash adjustment method, which relates to the technical field of cloth cutting. A rack, two gears meshing with the rack, and a pulley group driving the gear to rotate are provided; the pulley group includes two first pulleys, at least one second pulley, and a belt that is jointly sleeved on the outside of the first pulley and the second pulley; the adjustment method includes the following steps: setting the first pulley and the gear to a relative rotation state; initially pressing the belt between the two first pulleys to make the belt tension reach a first tension value; adjusting the two gears to rotate in opposite directions until the torque of the gear reaches the first torque value, switching the first pulley and the gear to a synchronous locking state; pressing the belt between the two first pulleys again to make the belt tension reach a second tension value. The present invention can reduce the gap between the gear and the rack, and improve the control accuracy of the cutter movement.

Description

Technical Field

[0001] The invention relates to the technical field of cloth cutting, and in particular to a double-gear transmission zero backlash adjustment method. Background Art

[0002] With the advancement of mechanization, most industries are moving towards mechanization and automation. Mechanization and automation have also been achieved in the field of cloth cutting. Most of the existing cloth cutting machines use cutting tables.

[0003] During the operation of the cutting table, the cutter needs to move along a prescribed trajectory to achieve the cutting of the fabric. In this process, a gear rack mechanism is generally used to drive the cutter. However, during use, the technicians found that due to the influence of processing accuracy, there is inevitably a gap between the gear and the rack, which directly leads to low control accuracy during the movement of the cutter. During the cutting process of the fabric, the fabric cut is uneven, and even the cut shape does not meet the predetermined requirements.

[0004] Based on this, in the process of cutting knife driving, how to design a method that can reduce the gap between the gear and the rack and improve the control accuracy of the cutting knife movement is one of the problems that need to be solved urgently. Summary of the invention

[0005] In order to solve at least one of the technical problems mentioned in the background technology, the purpose of the present invention is to provide a double-gear transmission zero backlash adjustment method, which can reduce the gap between the gear and the rack and improve the control accuracy of the cutting knife movement.

[0006] To achieve the above object, the present invention provides the following technical solutions:

[0007] A double-gear transmission zero backlash adjustment method is provided, providing a rack, two gears meshing with the rack, and a pulley group driving the gears to rotate; the pulley group includes two first pulleys, at least one second pulley, and a belt that is commonly sleeved on the outside of the first pulley and the second pulley; the first pulley corresponds to the gear one by one and has two states of relative rotation and synchronous locking; the adjustment method includes the following steps:

[0008] S1, setting the first pulley and the gear to a relative rotation state;

[0009] S2, initially pressing the belt between the two first pulleys to make the belt tension reach a first tension value;

[0010] S3, adjusting the two gears to rotate in opposite directions until the torque of the gears reaches a first torque value, switching the first pulley and the gears to a synchronous locking state;

[0011] S4, pressing the belt again at a position between the two first pulleys so that the tension of the belt reaches a second tension value.

[0012] In some embodiments of the present invention, in S2 and / or S4, the method of pressing the portion of the belt between the two first pulleys is as follows:

[0013] A pressure wheel abutting against the belt and a contact mechanism for maintaining the abutment state between the pressure wheel and the belt are arranged at the position of the belt between the two first pulleys.

[0014] In certain embodiments of the present invention, the top contact mechanism includes a mounting seat, a sliding rod is slidably connected to the mounting seat, the first end of the sliding rod is connected to a wheel seat for mounting a pressure wheel, and the outer sleeve of the sliding rod is provided with an elastic member for providing elastic force for the pressure wheel toward one side of the belt.

[0015] In some embodiments of the present invention, the elastic member includes a first spring and a second spring, both of which are compression springs, which are respectively sleeved on the outside of the slide rod and located on both sides of the wheel seat.

[0016] In some embodiments of the present invention, the second end of the slide rod is threadedly fitted with an adjusting nut, and the adjusting nut abuts against a second spring located on the same side of the wheel seat.

[0017] In some embodiments of the present invention, the first tensioning force value is 3.5 DaN to 4.0 DaN, and the second tensioning force value is 4.0 DaN to 4.5 DaN.

[0018] In some embodiments of the present invention, the first torque value is 3.5 DaN to 4.0 DaN.

[0019] In certain embodiments of the present invention, a method for implementing the switching between the relative rotation state and the synchronous locking state between the first pulley and the gear comprises:

[0020] A gear shaft extending toward the first pulley is provided on one side of the gear, and a clamping sleeve is provided between the gear shaft and the first pulley, and the clamping sleeve includes an inner ring provided on the gear shaft and an outer ring provided on the first pulley; when the inner ring and the outer ring are tightly embraced, the first pulley and the gear are in a synchronous locking state, and when the inner ring and the outer ring are separated, the first pulley and the gear are in a relative rotation state.

[0021] In some embodiments of the present invention, in S3, the method of adjusting the two gears to rotate in opposite directions is as follows:

[0022] Torque wrenches are respectively connected to the gear shafts of the two gears, and the two torque wrenches are rotated in opposite directions until the torque values ​​of the two torque wrenches reach the first torque values ​​respectively.

[0023] In some embodiments of the present invention, a connecting portion for connecting a torque wrench is provided at the end of the gear shaft, and the connecting portion is in a square column shape.

[0024] Compared with the prior art, the present invention has the following beneficial effects:

[0025] 1. The present invention sets the first pulley and the gear to a relative rotation state before the belt is tensioned to the second tensioning force value, and rotates the two gears in opposite directions, thereby reducing the gap between the two gears and the rack, thereby achieving the purpose of improving the control accuracy of the cutter movement.

[0026] 2. The belt tensioning of the present invention adopts a two-adjustment method, namely, the initial tensioning before adjusting the gear torque and the re-tensioning after adjusting the gear torque. During the re-tensioning process, as the belt is tensioned, it will further drive the first pulley and the gear to rotate in opposite directions, further reducing the gap between the two gears and the rack, thereby improving the control accuracy of the cutting knife movement. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 It is a flow chart of the adjustment method of the present invention.

[0028] Figure 2 It is an overall schematic diagram of the adjustment mechanism of the present invention.

[0029] Figure 3 It is a front schematic diagram of the adjustment mechanism of the present invention.

[0030] Figure 4 It is a schematic diagram of the cooperation between the gear and the rack of the present invention.

[0031] Figure 5 It is a schematic diagram of the tensioning mechanism of the present invention.

[0032] Figure 6 It is a partial cross-sectional view of the connection between the first pulley and the rack of the present invention.

[0033] Figure 7 It is an exploded view of the connection between the first pulley and the rack of the present invention.

[0034] Figure 8 It is a schematic diagram of a cutting table of the present invention.

[0035] In the figure:

[0036] K1, frame; k2, first bracket; k3, second bracket;

[0037] 2. Cutting knife transmission mechanism;

[0038] 3. Knife sharpening mechanism;

[0039] 4. Cutting knife;

[0040] 5. Double gear backlash adjustment mechanism;

[0041] 510, guide rail; 511, slider;

[0042] 520, rack;

[0043] 530, connecting plate;

[0044] 540, pulley assembly; 541, first pulley; 542, second pulley; 543, belt; 544, gear; 545, gear shaft; 546, locking mechanism; 547, rotating seat; 548, bearing;

[0045] 550, tensioning mechanism; 551, pressure wheel; 552, mounting seat; 553, sliding rod; 554, wheel seat; 555, first spring; 556, second spring; 557, adjusting nut; 558, waist-shaped hole. DETAILED DESCRIPTION

[0046] The technical solutions in the embodiments of the present invention are described clearly and completely below. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0047] This embodiment provides a double gear transmission zero backlash adjustment method, such as Figures 2 to 4 As shown, a rack 520, two gears 544 meshing with the rack 520, and a pulley set 540 for driving the gears 544 to rotate are provided. The pulley set 540 includes two first pulleys 541, at least one second pulley 542, and a belt 543 that is sleeved on the outside of the first pulley 541 and the second pulley 542. The first pulley 541 corresponds to the gear 544 one by one and has two states of relative rotation and synchronous locking.

[0048] It is worth mentioning that, in order to install the above-mentioned pulley set 540 and gear 544, the present method also provides a connecting plate 530, and the pulley set 540 and gear 544 are installed on the connecting plate 530. At the same time, in order to ensure that the transmission of the connecting plate 530 relative to the rack 520 is more stable, a guide rail 510 is arranged parallel to one side of the rack 520, and a slider 520 is slidably matched on the guide rail 510. The connecting plate 530 is fixedly connected to the slider 520 and slides along the direction of the guide rail 510 with the slider 520.

[0049] One of the first pulley 541 and the second pulley 542 is a driving pulley.

[0050] Preferably, the second pulley 542 is a driving pulley, which is mounted on the connecting plate 530 or the first bracket k2 on the top of the connecting plate 530, and a motor for driving the second pulley 542 to rotate is provided on the connecting plate 530.

[0051] The guide rail 510 and the rack 520 are installed on the bottom frame k1. Through the above structure, the first bracket k2 can move relative to the frame k1 along the direction where the guide rail 510 is located.

[0052] Please refer to Figure 1 , the adjustment method comprises the following steps:

[0053] S1, setting the first pulley 541 and the gear 544 to a relative rotation state;

[0054] S2, initially pressing the belt 543 between the two first pulleys 541 so that the tension of the belt 543 reaches a first tension value;

[0055] S3, such as Figure 3 As shown, the two gears 544 are adjusted to rotate in opposite directions until the torque of the gears reaches a first torque value, and the first pulley 541 and the gear 544 are switched to a synchronous locking state.

[0056] The first pulley 541 and the gear 544 are in relative rotation state, and the two gears are rotated in opposite directions, thereby reducing the gap between the two gears 544 and the rack 520, thereby achieving the purpose of improving the control accuracy of the cutter movement, and then the first pulley 541 and the gear 544 are locked.

[0057] S4, pressing the belt 543 again at the portion between the two first pulleys 541, so that the tension of the belt 543 reaches a second tension value.

[0058] A two-time tensioning method is adopted, namely, the initial tensioning before adjusting the torque of the gear 544 and the re-tensioning after adjusting the torque of the gear. During the re-tensioning process, as the belt is tensioned, it will further drive the first pulley 541 and the gear 544 to rotate in opposite directions, further reducing the gap between the two gears 544 and the rack 520, thereby improving the control accuracy of the cutting knife movement.

[0059] On the other hand, the reason for adopting the method of tensioning twice is that the gap between the gear 544 and the rack 520 is small. If only tensioning is performed once, the deformation of the belt 543 caused by the tensioning will cause the gear 544 to rotate further, so that the gap between the two gears 544 and the rack 520 is further reduced, and the tensioning force brought by adapting to the small gap is also very small, which is not enough to reach the second tensioning value we need.

[0060] It is worth mentioning that in S2 and / or S4, the method of pressing the belt 543 between the two first pulleys 541 is as follows:

[0061] like Figure 3 and Figure 5 As shown, a pressure wheel 551 is provided between the two first pulleys 541 to abut against the belt 543, and a contact mechanism is provided to maintain the abutment state between the pressure wheel 551 and the belt 543. The pressure wheel 551 presses the belt 543, increases the tension of the belt 543, and thus improves the transmission accuracy of the belt.

[0062] like Figure 5 As shown, the top contact mechanism includes a mounting base 552 fixedly mounted on the connecting plate 530, and a slide rod 553 is slidably connected to the mounting base 552. The first end of the slide rod 553 is connected to a wheel seat 554 for mounting a pressure wheel 551, and the wheel seat 554 is rotatably connected to the pressure wheel 551. The outer sleeve of the slide rod 553 is provided with an elastic member for providing an elastic force to the wheel seat 554 and the pressure wheel 551 toward one side of the belt 543, thereby achieving the effect of keeping the pressure wheel 551 and the belt 543 in a state of abutment.

[0063] In this embodiment, in order to maintain the relative constant force of the elastic member, the elastic member includes a first spring 555 and a second spring 556, and the first spring 555 and the second spring 556 are both compression springs, which are respectively mounted on the outside of the sliding rod 553 at both sides of the wheel seat 554.

[0064] Specifically, two ends of the first spring 555 respectively abut against the upper side surface of the wheel seat 552 and the lower side surface of the wheel seat 554 (or may be fixedly connected).

[0065] The first end of the second spring 556 abuts against or is fixedly connected to the lower side of the wheel seat 552, and the second end abuts against or is fixedly connected to the adjusting nut 557 at the second end of the slide bar 553. The adjusting nut 557 is threadedly engaged with the slide bar 553, and the telescopic state of the second spring 556 can be adjusted by moving the adjusting nut 557 on the slide bar 553, thereby adjusting the height of the pressure wheel 551 and the tension of the belt 543.

[0066] It is worth mentioning that in the process of the pressure wheel 551 pressing against the belt 543, the first pulley 541 and the gear 544 in a locked state with the first pulley 541 are pulled by the belt 543, which can also achieve the following Figure 3 and Figure 4 Rotation in the opposite direction as shown further reduces the meshing clearance between the gear 544 and the rack 520 .

[0067] At the same time, this embodiment also provides another adjustment structure of the tensioning mechanism 550, and a waist-shaped hole 558 and a bolt are provided on the mounting seat 552. The bolt passes through the waist-shaped hole 558 and is threadedly connected to the connecting plate 530. When it is necessary to increase the tension of the belt, the bolt can be loosened, and then the mounting seat 552 can be moved toward the side of the belt 543 and the bolt can be tightened.

[0068] The method for implementing the switching between the relative rotation state and the synchronous locking state of the first pulley 541 and the gear 544 includes:

[0069] like Figure 6 and Figure 7 As shown, a gear shaft 545 extending toward the first pulley 541 is provided on one side of the gear 544, and a tension sleeve 546 is provided between the gear shaft 545 and the first pulley 541, and the tension sleeve 546 includes an inner ring provided on the gear shaft 545 and an outer ring provided on the first pulley 541. When the inner ring and the outer ring are tightly embraced, the first pulley 541 and the gear 544 are in a synchronous locking state, and when the inner ring and the outer ring are separated, the first pulley 541 and the gear 544 are in a relative rotation state.

[0070] In order to ensure the rotation effect of the gear shaft 545, as Figure 6 and Figure 7 As shown, in this embodiment, a rotating assembly is provided between the gear shaft 545 and the connecting plate 530 , and the rotating assembly includes a rotating seat 547 fixedly mounted on the connecting plate 530 , and the rotating seat 547 is rotatably connected to the gear shaft 545 via a plurality of bearings 548 .

[0071] It is worth mentioning that, in order to install the bearing 548 in the rotating seat 547 , the rotating seat 547 adopts a split structure, consisting of two parts, and the two parts are connected by bolts to form a cavity for accommodating multiple bearings 548 .

[0072] In S3, the method of adjusting the two gears 544 to rotate in opposite directions is as follows:

[0073] Connect torque wrenches (not shown) to the gear shafts 545 of the two gears 544 respectively, and Figure 4 As shown, the two torque wrenches are rotated in opposite directions until the torque values ​​of the two torque wrenches reach the first torque value respectively. Figure 7 As shown, the end of the gear shaft 545 is provided with a connecting portion for connecting a torque wrench, and the connecting portion is in a square column shape.

[0074] The first tensioning force value is 3.5DaN to 4.0DaN, and the second tensioning force value is 4.0DaN to 4.5DaN. It is worth mentioning that the second tensioning force value needs to be kept larger than the first tensioning force value, and the difference may be 0.5DaN.

[0075] The first torque value is 3.5 DaN to 4.0 DaN.

[0076] When the above solution is used on a cutting table, please refer to Figure 8 The cutting bed includes a frame k1, a first bracket k2 slidably connected to the frame k1 along a first direction, and a second bracket k3 slidably connected to the first bracket k2 along a second direction. A cutting knife 4 and a cutting knife transmission mechanism 2 for driving the cutting knife 4 to move are arranged on the second bracket k3.

[0077] The transmission between the frame k1 and the first bracket k2, and / or between the first bracket k2 and the second bracket k3 is realized by the double gear backlash adjustment method as described in the first embodiment, which can improve the control accuracy of the cutter 4 during movement.

[0078] It is worth mentioning that, in order to realize automatic grinding of the cutting knife 4, a knife sharpening mechanism 3 is also provided on the second bracket k3.

[0079] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above and that the present invention can be implemented in other specific forms without departing from the spirit or essential features of the present invention. Therefore, the embodiments should be considered exemplary and non-restrictive in all respects, and the scope of the present invention is defined by the appended claims rather than the above description, and it is intended that all changes falling within the meaning and scope of the equivalent elements of the claims be included in the present invention.

Claims

1. A double gear transmission zero backlash adjustment method, characterized in that: A rack, two gears meshing with the rack, and a pulley group driving the gear to rotate are provided; the pulley group includes two first pulleys, at least one second pulley, and a belt that is sleeved on the outside of the first pulley and the second pulley; the first pulley corresponds to the gear one by one and has two states of relative rotation and synchronous locking; the adjustment method includes the following steps: S1, setting the first pulley and the gear to a relative rotation state; S2, initially pressing the belt between the two first pulleys to make the belt tension reach a first tension value; S3, adjusting the two gears to rotate in opposite directions until the torque of the gears reaches a first torque value, switching the first pulley and the gears to a synchronous locking state; S4, pressing the belt again at the portion between the two first pulleys so that the tension of the belt reaches a second tension value; The first tensioning force value is 3.5DaN to 4.0DaN, and the second tensioning force value is 4.0DaN to 4.5DaN; The first torque value is 3.5DaN to 4.0DaN; In S2 and / or S4, the method of pressing the belt between the two first pulleys is as follows: A pressure wheel abutting against the belt is arranged at a position of the belt between the two first pulleys, and a contact mechanism for maintaining the abutment state between the pressure wheel and the belt; The top contact mechanism comprises a mounting seat, a slide rod is slidably connected to the mounting seat, a first end of the slide rod is connected to a wheel seat for mounting a pressure wheel, and an elastic member is sleeved on the outside of the slide rod to provide elastic force for the pressure wheel toward one side of the belt; The elastic member includes a first spring and a second spring, both of which are compression springs, which are respectively sleeved on the outside of the sliding rod at both sides of the wheel seat; the second end of the sliding rod is threadedly equipped with an adjusting nut, and the adjusting nut abuts against the second spring located on the same side of the wheel seat.

2. A double gear transmission zero backlash adjustment method according to claim 1, characterized in that: The method for implementing the switching between the relative rotation state and the synchronous locking state of the first pulley and the gear comprises: A gear shaft extending toward the first pulley is provided on one side of the gear, and a clamping sleeve is provided between the gear shaft and the first pulley, and the clamping sleeve includes an inner ring provided on the gear shaft and an outer ring provided on the first pulley; when the inner ring and the outer ring are tightly embraced, the first pulley and the gear are in a synchronous locking state, and when the inner ring and the outer ring are separated, the first pulley and the gear are in a relative rotation state.

3. A double gear transmission zero backlash adjustment method according to claim 1, characterized in that: In S3, the method of adjusting the two gears to rotate in opposite directions is as follows: Torque wrenches are respectively connected to the gear shafts of the two gears, and the two torque wrenches are rotated in opposite directions until the torque values ​​of the two torque wrenches reach the first torque values ​​respectively.

4. A double gear transmission zero backlash adjustment method according to claim 3, characterized in that: The end of the gear shaft is provided with a connecting portion for connecting a torque wrench, and the connecting portion is in a square column shape.

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