Chain tensioning structure of sawing machine

Abstract

The utility model discloses a chain tensioning structure of a sawing machine, and aims to solve the problems that a chain is easy to loosen in the feeding process of a sawing machine feeding device in the prior art, so that a conveying chain falls off, and the sawing machine stops running. According to the technical scheme, the material conveying device comprises a plurality of material conveying rollers, at least two conveying roller transmission gears are arranged at the ends of the material conveying rollers, and transmission chains are arranged on the conveying roller transmission gears of the adjacent material conveying rollers; a tensioning assembly is arranged on the transmission chain and comprises a tensioning gear, and the tensioning gear abuts against the transmission chain to tension the transmission chain. The tensioning gear abuts against the transmission chain to achieve tensioning of the transmission chain, and the tensioning device has the advantages of being simple in structure and convenient to use. And meanwhile, the function of adjusting the tensioning of the transmission chain can be achieved by rotating the abutting threaded sleeve, and the adjusting device has the advantage of being convenient to adjust.

Description

Technical Field

[0001] The utility model relates to the technical field of sawing machines, and more specifically, to a chain tensioning structure of a sawing machine. Background Art

[0002] The sawing machine usually adopts chain drive when conveying materials. During the chain drive process, the chain is prone to loosening, causing the chain to detach from the transmission teeth, causing the sawing machine to stop running, seriously affecting the work efficiency.

[0003] Chinese patent announcement number CN209598333U, announcement date November 8, 2019, the name of the patent is sawing machine feeding and withdrawing device, the application discloses a sawing machine feeding device, the adjacent rollers are transmitted by a conveyor chain, after a long period of operation, the conveyor chain is prone to loosening, causing the conveyor chain to fall off, and then causing the machine to stop operating. Utility Model Content

[0004] The utility model overcomes the problem in the prior art that the chain of a sawing machine feeding device is prone to loosening during the feeding process, causing the conveying chain to fall off, thereby causing the sawing machine to stop operating, and provides a sawing machine chain tensioning structure, which can provide a continuous tensioning function for the chain, thereby preventing the chain from loosening, and further preventing the machine from stopping operating due to the chain falling off.

[0005] In order to solve the above technical problems, the utility model adopts the following technical solutions: a chain tensioning structure of a sawing machine, comprising: a plurality of material transport rollers, at least two transport roller transmission gears are arranged at the ends of the material transport rollers, and a transmission chain is arranged on the transport roller transmission gears of adjacent material transport rollers; a tensioning assembly is arranged on the transmission chain, the tensioning assembly includes a tensioning gear, and the tensioning gear abuts against the transmission chain to tighten the transmission chain.

[0006] In the utility model, a tensioning component is provided to realize the tensioning function of the transmission chain, and the tensioning of the transmission chain is realized by abutting the tensioning gear on the transmission chain, which has the characteristics of simple structure and convenient use; at the same time, the function of adjusting the tension of the transmission chain can be realized by rotating the abutting screw sleeve, which has the advantage of convenient adjustment.

[0007] Preferably, the tensioning assembly also includes a tensioning mounting seat and a supporting base, and the tensioning gear is installed on the top of the tensioning mounting seat; an abutment screw is provided on the supporting base, and an abutment screw sleeve is sleeved on the abutment screw, and the abutment screw and the abutment screw sleeve are threadedly matched.

[0008] When the tensioning force of the tensioning gear tensioning transmission chain needs to be adjusted, the abutment screw sleeve can be rotated to make the abutment screw sleeve move upward along the abutment screw rod, so that the abutment screw sleeve moves upward against the tensioning mounting seat, thereby achieving the purpose of adjusting the tensioning force.

[0009] Preferably, an abutment plate is provided at the bottom of the abutment screw sleeve, an abutment hole is provided on the abutment plate, the abutment screw rod is passed through the abutment hole, and the bottom of the abutment screw sleeve is provided in the abutment hole.

[0010] The abutment screw sleeve is arranged in the abutment hole so that the abutment screw sleeve can slide in the abutment hole, thereby limiting the radial displacement of the abutment screw sleeve through the abutment hole.

[0011] Preferably, the transport roller transmission gear comprises a transmission sleeve, on which two circles of transmission teeth are arranged; a transmission chain is wound around the two circles of transmission teeth; two tensioning gears are arranged side by side, and the two tensioning gears cooperate with the two transmission chains respectively.

[0012] Two tensioning gears are arranged side by side, and the two tensioning gears are matched with two transmission chains respectively. By arranging two circles of transmission gears, the reliability of the transmission of adjacent material transport rollers can be improved.

[0013] Preferably, the tensioning assembly is arranged at the bottom of the transmission chain, and the tensioning gear abuts against the bottom of the transmission chain.

[0014] The tensioning assembly is arranged at the bottom of the transmission chain, so that the tensioning gear can tighten the bottom of the transmission chain.

[0015] Preferably, the tensioning assembly is arranged on the top of the transmission chain, and the tensioning gear abuts against the top of the transmission chain.

[0016] By installing the tensioning assembly on the horizontal rod, the tensioning assembly can tighten the upper transmission chain.

[0017] Preferably, it also includes an output motor, and at least one of the several material transport rollers is provided with three transmission gears; the three transmission gears are respectively a first transmission gear, a second transmission gear and a third transmission gear; an output gear is provided on the output shaft of the output motor, and the output gear and the third transmission gear are connected by an output chain.

[0018] Through the above arrangement, when the material transport roller is transporting materials, the materials can be placed in the middle position of the groove due to the effect of gravity; for example, when transporting cylindrical materials, the cylindrical materials can be effectively prevented from rolling, thereby improving the stability of the material transport roller when transporting materials.

[0019] Compared with the prior art, the beneficial effects of the utility model are:

[0020] By setting up a tensioning component, the tensioning function of the transmission chain is realized, and the tensioning of the transmission chain is realized by the tensioning gear abutting against the transmission chain. It has the characteristics of simple structure and easy use. At the same time, by rotating the abutting screw sleeve, the function of adjusting the tension of the transmission chain can be realized, which has the advantage of easy adjustment. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a three-dimensional structural diagram of the utility model;

[0022] Figure 2 It is a three-dimensional structural diagram of the utility model from another angle;

[0023] Figure 3 yes Figure 2 A partial enlarged view of the

[0024] Figure 4 It is a three-dimensional structural diagram of the tensioning assembly of the utility model;

[0025] Figure 5 It is a cross-sectional view of the tensioning assembly of the utility model;

[0026] Figure 6 It is the material transport roller of the utility model;

[0027] Figure 7 It is a three-dimensional structural diagram of Example 2 of the present utility model;

[0028] Figure 8 It is a three-dimensional structural diagram of Example 3 of the utility model;

[0029] In the figure: 1, material transport roller, 11, groove;

[0030] 2. a transmission gear of a transport roller, 21. a first transmission gear, 22. a second transmission gear, 23. a third transmission gear, 24. a transmission sleeve, 25. a transmission tooth;

[0031] 3. Transmission chain;

[0032] 4. Tensioning assembly, 41. Tensioning gear, 42. Tensioning mounting seat, 421. Supporting shaft, 422. Guide hole, 423. Sliding groove, 424. Tensioning abutting block, 425. Tensioning abutting hole, 426. Abutting bolt, 43. Supporting base, 44. Abutting screw, 45. Abutting screw sleeve, 46. Abutting plate, 461. Abutting hole; 47. Tensioning sliding block, 471. Through long slot, 472. Fixing bolt;

[0033] 5. output motor, 51. output gear, 52. output chain;

[0034] 6. Vertical pole, 61. Horizontal pole. DETAILED DESCRIPTION

[0035] The technical solution of the present invention is further described in detail below through specific embodiments and in conjunction with the accompanying drawings:

[0036] Example 1: Reference Figures 1 to 6 As shown, a chain tensioning structure for a sawing machine comprises: a plurality of material transport rollers 1, the plurality of material transport rollers 1 are arranged in parallel, at least two transport roller transmission gears 22 are arranged at the end of each material transport roller 1, the two transport roller transmission gears 2 are respectively a first transmission gear 21 and a second transmission gear 22, and a transmission chain 3 is arranged on the transport roller transmission gears 2 of adjacent material transport rollers 1, and the transmission chain 3 is wound around the first transmission gear 21 or the second transmission gear 22 of the adjacent material transport rollers 1, that is, the transmission chain 3 between the first material transport roller 1 and the second material transport roller 1 is wound around the first transmission gear 21, the transmission chain 3 between the second material transport roller 1 and the third material transport roller 1 is wound around the second transmission gear 22, and the transmission chain 3 between the third material transport roller 1 and the fourth material transport roller 1 is wound around the first transmission gear 21, and so on, and the plurality of material transport rollers 1 are arranged in the above manner. The length of the material transport line composed of the plurality of material transport rollers 1 is determined by the spacing between the adjacent material transport rollers 1 and the number of the material transport rollers 1.

[0037] A tensioning assembly 4 is arranged on the transmission chain 3. The tensioning assembly 4 in this embodiment is arranged at the bottom of the transmission chain 3. The tensioning assembly 4 includes a tensioning gear 41, a tensioning mounting seat 42 and a supporting base 43. The tensioning gear 41 abuts against the transmission chain 3 to tighten the transmission chain 3. The tensioning gear 41 is mounted on the top of the tensioning mounting seat 42. A supporting shaft 421 is arranged on the top of the tensioning mounting seat 42. The tensioning gear 41 is rotatably arranged on the supporting shaft 421. An abutting screw 44 is vertically arranged on the supporting base 43. A guide hole 422 is arranged at the bottom of the tensioning mounting seat 42. The top of the abutting screw 44 is penetrated in the guide hole 422. The guide hole 422 and the abutting screw 44 are slidably connected, that is, the abutting screw 44 can slide freely in the guide hole 422. An abutting screw sleeve 45 is sleeved on the abutting screw 44, and the abutting screw 44 and the abutting screw sleeve 45 are threadedly matched. When the tensioning force of the tensioning gear 41 to tighten the transmission chain 3 needs to be adjusted, the abutment screw sleeve 45 can be rotated to make the abutment screw sleeve 45 move upward along the abutment screw rod 44, so that the abutment screw sleeve 45 moves upward against the tensioning mounting seat 42, thereby achieving the purpose of adjusting the tensioning force.

[0038] The bottom of the abutting screw sleeve 45 is provided with an abutting plate 46, and the abutting plate 46 is provided with an abutting hole 461. The abutting screw rod 44 is penetrated in the abutting hole 461, and the bottom of the abutting screw sleeve 45 is provided in the abutting hole 461. The abutting screw sleeve 45 is arranged in the abutting hole 461, so that the abutting screw sleeve 45 can slide in the abutting hole 461, thereby limiting the radial displacement of the abutting screw sleeve 45 through the abutting hole 461.

[0039] It also includes an output motor 5, at least one of the plurality of material transport rollers 1 is provided with three transmission gears, and the three transmission gears are key-connected with the output roller; the three transmission gears are respectively a first transmission gear 21, a second transmission gear 22 and a third transmission gear 23; an output gear 51 is provided on the output shaft of the output motor, and the output gear and the third transmission gear 23 are connected through an output chain 52. When the output shaft of the output motor rotates, the output shaft drives the third transmission gear 23 to rotate through the output chain, and the third transmission gear 23 drives the output roller to rotate, and then the output roller is sequentially driven through the transmission chain 3 and the transport roller transmission gear 2, driving all the material transport rollers 1 to rotate.

[0040] In order to improve the stability of the material transport roller 1 when transporting materials, in the present embodiment, the material transport roller 1 is arranged as a "V-shaped" roller, that is, the material transport roller 1 is thin in the middle position and gradually thickens from the middle to both sides, so that a downwardly concave groove 11 is formed in the middle position of the material transport roller 1, so that when the material transport roller 1 transports materials, the materials can be in the middle position of the groove 11 due to the effect of gravity; for example, when transporting cylindrical materials, the cylindrical materials can be effectively prevented from rolling, thereby improving the stability of the material transport roller 1 when transporting materials.

[0041] In addition, in order to improve the reliability of the transmission of the adjacent material transport rollers 1, the transport roller transmission gear 2 includes a transmission sleeve 24, the transmission sleeve 24 and the material transport roller 1 are connected by a key, and two circles of transmission teeth 25 are arranged on the transmission sleeve 24; the two circles of transmission teeth are wound with a transmission chain 3; two tensioning gears 41 are arranged side by side, and the two tensioning gears 41 are respectively matched with the two transmission chains 3. By providing two circles of transmission gears, the reliability of the transmission of the adjacent material transport rollers 1 can be improved.

[0042] In this embodiment, a tensioning component 4 is provided to realize the tensioning function of the transmission chain 3, and the tensioning of the transmission chain 3 is realized by abutting the tensioning gear 41 on the transmission chain 3, which has the characteristics of simple structure and convenient use; at the same time, by rotating the abutting screw sleeve 45, the function of adjusting the tension of the transmission chain 3 can be realized, which has the advantage of convenient adjustment.

[0043] Example 2: Reference Figure 1 , Figure 2 , Figure 3 , Figure 6 , Figure 7 As shown, a chain tensioning structure of a sawing machine comprises: a plurality of material transport rollers 1, the plurality of material transport rollers 1 are arranged in parallel on a fixed pillow bar 12, at least two transport roller transmission gears 22 are arranged at the end of each material transport roller 1, the two transport roller transmission gears 2 are respectively a first transmission gear 21 and a second transmission gear 22, and a transmission chain 3 is arranged on the transport roller transmission gears 2 of adjacent material transport rollers 1, and the transmission chain 3 is wound on the first transmission gear 21 or the second transmission gear 22 of the adjacent material transport rollers 1, that is, the transmission chain 3 between the first material transport roller 1 and the second material transport roller 1 is wound on the first transmission gear 21, the transmission chain 3 between the second material transport roller 1 and the third material transport roller 1 is wound on the second transmission gear 22, and the transmission chain 3 between the third material transport roller 1 and the fourth material transport roller 1 is wound on the first transmission gear 21, and so on, and the plurality of material transport rollers 1 are arranged in the above manner. The length of the material transport line composed of the plurality of material transport rollers 1 is determined by the spacing between the adjacent material transport rollers 1 and the number of the material transport rollers 1.

[0044] A tensioning assembly 4 is arranged on the transmission chain 3 . In this embodiment, the tensioning assembly 4 is arranged at the bottom of the transmission chain 3 . The tensioning assembly 4 includes a tensioning gear 41 and a tensioning mounting seat 42. The tensioning mounting seat is fixedly arranged on the side wall of the fixed pillow strip 12 by welding, and the tensioning mounting seat 42 is provided with a sliding groove 423 in the vertical direction; a tensioning sliding block 47 is arranged in the sliding groove, and a supporting shaft 421 is arranged on the top of the tensioning sliding block 47, and the tensioning gear 41 is rotatably arranged on the supporting shaft 421; the bottom of the tensioning mounting seat 42 protrudes outward to form a tensioning abutting block 424, and a tensioning abutting hole 425 is penetrated on the tensioning abutting block 424, and an abutting bolt 426 is arranged in the inner thread of the tensioning abutting hole 425, and the abutting bolt 426 passes through the tensioning abutting hole 425 and abuts against the bottom of the tensioning abutting block 424; a through long groove 471 is arranged on the side wall of the tensioning sliding block 47, and two fixing screw holes are arranged in the sliding groove, and two fixing bolts 472 pass through the through long groove 471 and are respectively threadedly connected with the two fixing screw holes.

[0045] When the tensioning force of the tensioning gear 41 to tighten the transmission chain 3 needs to be adjusted, the abutment bolt 426 can be rotated to move the abutment bolt 426 upward along the abutment screw rod 44, so that the abutment bolt 426 moves upward against the tensioning sliding block 2, thereby achieving the purpose of adjusting the tensioning force.

[0046] It also includes an output motor 5, at least one of the plurality of material transport rollers 1 is provided with three transmission gears, and the three transmission gears are key-connected with the output roller; the three transmission gears are respectively a first transmission gear 21, a second transmission gear 22 and a third transmission gear 23; an output gear 51 is provided on the output shaft of the output motor, and the output gear and the third transmission gear 23 are connected through an output chain 52. When the output shaft of the output motor rotates, the output shaft drives the third transmission gear 23 to rotate through the output chain, and the third transmission gear 23 drives the output roller to rotate, and then the output roller is sequentially driven through the transmission chain 3 and the transport roller transmission gear 2, driving all the material transport rollers 1 to rotate.

[0047] In order to improve the stability of the material transport roller 1 when transporting materials, in the present embodiment, the material transport roller 1 is arranged as a "V-shaped" roller, that is, the material transport roller 1 is thin in the middle position and gradually thickens from the middle to both sides, so that a downwardly concave groove 11 is formed in the middle position of the material transport roller 1, so that when the material transport roller 1 transports materials, the materials can be in the middle position of the groove 11 due to the effect of gravity; for example, when transporting cylindrical materials, the cylindrical materials can be effectively prevented from rolling, thereby improving the stability of the material transport roller 1 when transporting materials.

[0048] In addition, in order to improve the reliability of the transmission of the adjacent material transport rollers 1, the transport roller transmission gear 2 includes a transmission sleeve 24, the transmission sleeve 24 and the material transport roller 1 are connected by a key, and two circles of transmission teeth 25 are arranged on the transmission sleeve 24; the two circles of transmission teeth are wound with a transmission chain 3; two tensioning gears 41 are arranged side by side, and the two tensioning gears 41 are respectively matched with the two transmission chains 3. By providing two circles of transmission gears, the reliability of the transmission of the adjacent material transport rollers 1 can be improved.

[0049] In this embodiment, a tensioning component 4 is provided to realize the tensioning function of the transmission chain 3, and the tensioning of the transmission chain 3 is realized by abutting the tensioning gear 41 on the transmission chain 3, which has the characteristics of simple structure and convenient use; at the same time, by rotating the abutting screw sleeve 45, the function of adjusting the tension of the transmission chain 3 can be realized, which has the advantage of convenient adjustment.

[0050] Example 3: Reference Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 , Figure 6 , Figure 8As shown, a chain tensioning structure of a sawing machine includes: a plurality of material transport rollers 1, the plurality of material transport rollers 1 are arranged in parallel, at least two transport roller transmission gears 22 are arranged at the end of each material transport roller 1, the two transport roller transmission gears 2 are respectively a first transmission gear 21 and a second transmission gear 22, and a transmission chain 3 is arranged on the transport roller transmission gears 2 of adjacent material transport rollers 1, and the transmission chain 3 is wound on the first transmission gear 21 or the second transmission gear 22 of the adjacent material transport rollers 1, that is, the transmission chain 3 between the first material transport roller 1 and the second material transport roller 1 is wound on the first transmission gear 21, the transmission chain 3 between the second material transport roller 1 and the third material transport roller 1 is wound on the second transmission gear 22, and the transmission chain 3 between the third material transport roller 1 and the fourth material transport roller 1 is wound on the first transmission gear 21, and so on, and the plurality of material transport rollers 1 are arranged in the above manner. The length of the material transport line composed of the plurality of material transport rollers 1 is determined by the spacing between the adjacent material transport rollers 1 and the number of the material transport rollers 1.

[0051] A tensioning assembly 4 is disposed on the transmission chain 3. In this embodiment, according to the rotation direction of the material transport roller 1, the tensioning assembly 4 can be disposed above the transmission chain 3. Specifically, as shown in FIG. Figure 7 The side walls of the plurality of transport rollers shown are provided with vertical poles 6, the tops of the vertical poles are provided with horizontal poles 61, and the ends of the horizontal poles are fixedly provided on the support base 43.

[0052] The tensioning assembly 4 includes a tensioning gear 41, a tensioning mounting seat 42 and a supporting base 43. The tensioning gear 41 abuts against the transmission chain 3 to tighten the transmission chain 3. The tensioning gear 41 is mounted on the top of the tensioning mounting seat 42. A supporting shaft 421 is arranged on the top of the tensioning mounting seat 42. The tensioning gear 41 is rotatably arranged on the supporting shaft 421. An abutting screw 44 is vertically arranged on the supporting base 43. A guide hole 422 is arranged at the bottom of the tensioning mounting seat 42. The top of the abutting screw 44 is penetrated in the guide hole 422. The guide hole 422 and the abutting screw 44 are slidably connected, that is, the abutting screw 44 can slide freely in the guide hole 422. An abutting screw sleeve 45 is sleeved on the abutting screw 44, and the abutting screw 44 and the abutting screw sleeve 45 are threadedly matched. When the tensioning force of the tensioning gear 41 to tighten the transmission chain 3 needs to be adjusted, the abutment screw sleeve 45 can be rotated to make the abutment screw sleeve 45 move upward along the abutment screw rod 44, so that the end of the abutment screw sleeve 45 moves upward against the tensioning mounting seat 42, thereby achieving the purpose of adjusting the tensioning force.

[0053] The bottom of the abutting screw sleeve 45 is provided with an abutting plate 46, and the abutting plate 46 is provided with an abutting hole 461. The abutting screw rod 44 is penetrated in the abutting hole 461, and the bottom of the abutting screw sleeve 45 is provided in the abutting hole 461. The abutting screw sleeve 45 is arranged in the abutting hole 461, so that the abutting screw sleeve 45 can slide in the abutting hole 461, thereby limiting the radial displacement of the abutting screw sleeve 45 through the abutting hole 461.

[0054] It also includes an output motor 5, at least one of the plurality of material transport rollers 1 is provided with three transmission gears, and the three transmission gears are key-connected with the output roller; the three transmission gears are respectively a first transmission gear 21, a second transmission gear 22 and a third transmission gear 23; an output gear 51 is provided on the output shaft of the output motor, and the output gear and the third transmission gear 23 are connected through an output chain 52. When the output shaft of the output motor rotates, the output shaft drives the third transmission gear 23 to rotate through the output chain, and the third transmission gear 23 drives the output roller to rotate, and then the output roller is sequentially driven through the transmission chain 3 and the transport roller transmission gear 2, driving all the material transport rollers 1 to rotate.

[0055] In order to improve the stability of the material transport roller 1 when transporting materials, in the present embodiment, the material transport roller 1 is arranged as a "V-shaped" roller, that is, the material transport roller 1 is thin in the middle position and gradually thickens from the middle to both sides, so that a downwardly concave groove 11 is formed in the middle position of the material transport roller 1, so that when the material transport roller 1 transports materials, the materials can be in the middle position of the groove 11 due to the effect of gravity; for example, when transporting cylindrical materials, the cylindrical materials can be effectively prevented from rolling, thereby improving the stability of the material transport roller 1 when transporting materials.

[0056] In addition, in order to improve the reliability of the transmission of the adjacent material transport rollers 1, the transport roller transmission gear 2 includes a transmission sleeve 24, the transmission sleeve 24 and the material transport roller 1 are connected by a key, and two circles of transmission teeth 25 are arranged on the transmission sleeve 24; the two circles of transmission teeth are wound with a transmission chain 3; two tensioning gears 41 are arranged side by side, and the two tensioning gears 41 are respectively matched with the two transmission chains 3. By providing two circles of transmission gears, the reliability of the transmission of the adjacent material transport rollers 1 can be improved.

[0057] In this embodiment, by installing the tensioning assembly 4 on the horizontal rod 61 , the tensioning assembly 4 can tension the upper transmission chain 3 .

[0058] The above-described embodiments are only preferred solutions of the present invention and are not intended to limit the present invention in any form. Other variations and modifications are possible without exceeding the technical solutions described in the claims.

Claims

1. A chain tensioning structure for a sawing machine, characterized in that: include: A plurality of material transport rollers are provided, at least two transport roller transmission gears are arranged at the ends of the material transport rollers, and a transmission chain is arranged on the transport roller transmission gears of adjacent material transport rollers; a tensioning assembly is arranged on the transmission chain, and the tensioning assembly includes a tensioning gear, and the tensioning gear abuts against the transmission chain to tighten the transmission chain.

2. The chain tensioning structure of a sawing machine according to claim 1, characterized in that: The tensioning assembly also includes a tensioning mounting seat, which is provided with a sliding groove in the vertical direction; a tensioning sliding block is provided in the sliding groove, a supporting rotating shaft is provided on the top of the tensioning sliding block, and the tensioning gear is rotatably provided on the supporting rotating shaft; an abutment bolt is provided at the bottom of the tensioning mounting seat, and the abutment bolt pushes the tensioning mounting seat to slide along the sliding groove.

3. The chain tensioning structure of a sawing machine according to claim 1, characterized in that: The tensioning assembly also includes a tensioning mounting seat and a supporting base, and the tensioning gear is installed on the top of the tensioning mounting seat; an abutment screw is arranged on the supporting base, and an abutment screw sleeve is sleeved on the abutment screw, and the abutment screw and the abutment screw sleeve are threadedly matched.

4. The chain tensioning structure of a sawing machine according to claim 2, characterized in that: The bottom of the abutting screw sleeve is provided with an abutting plate, the abutting plate is provided with an abutting hole, the abutting screw rod is passed through the abutting hole, and the bottom of the abutting screw sleeve is arranged in the abutting hole.

5. The chain tensioning structure for a sawing machine according to claim 1, characterized in that: The transport roller transmission gear comprises a transmission sleeve, on which two circles of transmission teeth are arranged; transmission chains are wound around the two circles of transmission teeth; two tensioning gears are arranged side by side, and the two tensioning gears are matched with the two transmission chains respectively.

6. The chain tensioning structure for sawing machines according to claim 1, 3, 4 or 5, characterized in that: The tensioning assembly is arranged at the bottom of the transmission chain, and the tensioning gear abuts against the bottom of the transmission chain.

7. The chain tensioning structure for sawing machines according to claim 1, 3, 4 or 5, characterized in that: The tensioning assembly is arranged on the top of the transmission chain, and the tensioning gear abuts against the top of the transmission chain.

8. The chain tensioning structure for a sawing machine according to any one of claims 1 to 5, characterized in that: It also includes an output motor, and at least one of the output rollers among the plurality of material transport rollers is provided with three transmission gears; the three transmission gears are respectively a first transmission gear, a second transmission gear and a third transmission gear; an output gear is provided on the output shaft of the output motor, and the output gear and the third transmission gear are connected by an output chain.

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