Chain tensioning device

Abstract

The utility model relates to a chain tensioning device, and belongs to the technical field of chain transmission structures. The device comprises two supporting screw rods, an adjusting plate, a supporting piece, a chain wheel and an elastic piece, the two supporting screw rods extend in the vertical direction and are arranged at intervals from left to right, welding blocks are connected to the bottom ends of the two supporting screw rods, the two supporting screw rods are movably sleeved with the adjusting plate, and the chain wheel is arranged on the adjusting plate. Adjusting nuts are screwed on the supporting screws and located on the upper side and the lower side of the adjusting plate in a threaded mode, the adjusting nuts are pressed on the adjusting plate to fix the adjusting plate, the two supporting screws are movably sleeved with the supporting piece, the supporting piece is located below the adjusting plate, and the chain wheel is rotationally assembled on the supporting piece and located on the side, back on to the adjusting plate, of the supporting piece. The elastic piece is connected between the adjusting plate and the supporting piece. The top of the supporting piece is connected with a guide rod extending in the vertical direction, the adjusting plate is provided with a guide hole corresponding to the guide rod in position, and the guide rod is inserted into the guide hole.

Description

Technical Field

[0001] The utility model relates to the technical field of chain drive structures, in particular to a chain tensioning device. Background Art

[0002] The output sprocket of the reducer of the centrifuge downcomer is driven by a chain with the transmission shaft of the lifting structure. When the cast pipe descends to above the cast pipe transportation track, it needs to stop descending for a period of time, and then descend to the transportation track after the previous cast pipe on the transportation track is conveyed away. When the cast pipe stops descending, due to inertia, there is an impact, and the chain is prone to looseness and tooth misalignment, resulting in inaccurate transmission ratio. The electrical detection system relies on detecting the number of rotation circles of the output shaft of the reducer to judge the descending height. After the chain loosens and causes tooth misalignment, the detection of the height position of the cast pipe will be inaccurate, resulting in measurement deviation, causing the descending height of the cast pipe to change and generating equipment accidents. Summary of the Utility Model

[0003] The utility model provides a chain tensioning device to solve the technical problem that the transmission chain between the centrifuge downcomer and the lifting structure in the prior art is prone to loosening.

[0004] To solve the above problems, a chain tensioning device provided by the utility model adopts the following technical solutions:

[0005] A chain tensioning device includes two support screws, an adjusting plate, a support member, a sprocket and an elastic member. The two support screws extend vertically and are arranged at intervals from left to right. Welding blocks are connected to the bottom ends of the two support screws. The adjusting plate is movably sleeved on the two support screws. Adjusting nuts are screwed on the support screws on both the upper and lower sides of the adjusting plate, and the adjusting nuts are pressed against the adjusting plate to fix the adjusting plate. The support member is movably sleeved on the two support screws. The support member is located below the adjusting plate. The sprocket is rotatably assembled on the support member. The sprocket is located on the side of the support member facing away from the adjusting plate. The elastic member is connected between the adjusting plate and the support member.

[0006] Adopting the above technical solutions, the height position of the adjusting plate on the support screw can be adjusted. When the chain is loose, the position of the adjusting plate can be adjusted, and the adjusting plate can be moved downward to press the sprocket against the chain to achieve tensioning of the chain, and the tensioning method is simple. When installing this tensioning device, the device is welded to the welding part through the welding block. The welding block is small in volume and occupies little space, which is convenient to find a position on the existing structure for the welding block to be welded to fix this chain tensioning device. The welding area of the welding block on the existing structure is small, and the welding damage to the existing structure is small, avoiding the influence of welding on the strength of the existing structure. An elastic member is connected between the adjusting plate and the support member, which can realize automatic adjustment of the tensioning force and reduce the impact and vibration brought to the sprocket during the transmission process.

[0007] Further, a guide rod extending in the vertical direction is connected to the top of the support member. Guide holes corresponding to the positions of the guide rods are provided on the adjusting plate, and the guide rods are inserted into the guide holes.

[0008] With the above technical solution, a guide post is provided to guide the movement of the support member, avoiding deviation of the sprocket during automatic adjustment.

[0009] Further, the elastic member is a helical spring, and the elastic member is sleeved outside the guide rod.

[0010] Further, the support member includes a horizontal plate and two vertical plates vertically connected to the bottom of the horizontal plate. The two vertical plates are parallel to each other and are arranged at intervals from left to right. The horizontal plate is movably sleeved on two support screws. The guide rod is vertically connected to the top surface of the horizontal plate. The elastic member is connected between the horizontal plate and the adjusting plate. The sprocket is located between the two vertical plates and is rotatably assembled on the two vertical plates. The axis of the sprocket extends in the left-right direction.

[0011] Further, the sprocket is sleeved on a sprocket shaft extending from left to right. The sprocket shaft includes a circular shaft section in the middle and two square shaft sections respectively connected to the left and right ends of the circular shaft section. The sprocket is sleeved on the circular shaft section. Square through holes are provided on the vertical plates, and the two square shaft sections are respectively inserted into the square through holes on the two vertical plates.

[0012] Further, the vertical plate includes a main board section and a fixing board section. The main board section is vertically connected to the bottom of the horizontal plate. The bottom of the main board section is provided with a U-shaped notch opening downward. The fixing board section is connected to the bottom of the main board section by bolts. The fixing board section seals the bottom end of the U-shaped notch. The square through hole on the vertical plate is formed by the top surface of the fixing board section and the inner wall of the U-shaped notch.

[0013] With the above technical solution, it is convenient to install the sprocket shaft on the two vertical plates.

[0014] Further, two long-strip-shaped adjusting holes arranged at intervals in the left-right direction are provided on the adjusting plate. The adjusting holes extend in the left-right direction. The adjusting plate is sleeved on the two support screws through the two adjusting holes. Two movable through holes corresponding to the two adjusting holes up and down are provided on the horizontal plate. Both of the two movable through holes are long-strip-shaped and extend in the left-right direction. The horizontal plate is sleeved on the two support screws through the two movable through holes.

[0015] With the above technical solution, by providing long-strip-shaped adjusting holes and movable through holes, the dimensional error of the distance between the two welding blocks caused by inaccurate welding positions of the welding blocks can be adapted, and the space of the existing structure can be better adapted. When the welding area on the existing structure is insufficient, the two support screws can be placed closer to each other.

[0016] Further, an external thread is provided at the bottom end of the support screw rod, and the welding block is screwed onto the bottom end of the support screw rod.

[0017] With the above technical solution, the support screw rod and the welding block are detachable. When installing this sprocket tensioning device on an existing structure, the welding block can be first welded to the existing structure, and then the support screw rod and other structures can be assembled. Compared with the method of making the welding block and the support screw rod into an integral body and welding the welding block to the existing structure together with the support screw rod, it can avoid the deformation of the support screw rod caused by welding, and the operation of welding the welding block alone is more convenient and the welding efficiency is higher. When the equipment fails and is scrapped, the support rod and other structures can also be removed from the welding block and assembled onto other equipment for use, avoiding unnecessary waste.

[0018] The beneficial effects of a chain tensioning device provided by the present utility model are as follows: By adjusting the up and down position of the adjusting plate to change the position of the sprocket to tension the chain, effectively preventing the chain from loosening. The chain tensioning device is welded to the existing structure through the welding block, occupying a small space, facilitating the arrangement of this sprocket tensioning device on the existing structure, and having a small welding area, which can reduce the welding damage to the existing structure. The welding block and the connecting screw rod are detachably connected together, facilitating the removal and transfer of this chain tensioning device from the existing structure for use. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] By referring to the accompanying drawings and reading the following detailed description, the above and other objects, features, and advantages of the exemplary embodiments of the present utility model will become readily understood. In the drawings, several embodiments of the present utility model are shown in an exemplary rather than restrictive manner, and the same or corresponding reference numerals represent the same or corresponding parts, wherein:

[0020] Figure 1 is a structural schematic diagram of a chain tensioning device provided by the present utility model Figure 1 ;

[0021] Figure 2 is a structural schematic diagram of a chain tensioning device provided by the present utility model Figure 2 ;

[0022] Figure 3 is a structural schematic diagram of a chain tensioning device provided by the present utility model Figure 3 ;

[0023] Figure 4 is a structural schematic diagram of the sprocket and the sprocket shaft in a chain tensioning device provided by the present utility model.

[0024] Explanation of the reference numerals:

[0025] 1. Support screw; 2. Welding block; 3. Horizontal plate; 4. Vertical plate; 401. Main board section; 402. Fixed plate section; 5. Sprocket; 6. Adjusting plate; 7. Guide rod; 8. Elastic member; 9. Adjusting nut; 10. Sprocket shaft; 1001. Square shaft section; 1002. Round shaft section. Detailed implementation manners

[0026] The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Those skilled in the art should understand that the embodiments described below are some, but not all, of the embodiments of the present disclosure. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0027] The following is an embodiment of the chain tensioning device provided by the present invention:

[0028] As Figure 1 、 Figure 2 shown, a chain tensioning device includes a support screw 1, an adjusting plate 6, a support member, a guide rod 7, a sprocket 5, a sprocket shaft 10, an elastic member 8 and a welding block 2.

[0029] There are two support screws 1, and both support screws 1 extend in the up and down direction and are spaced apart from left to right. External threads are provided at the top and bottom of each support screw 1. Two adjusting nuts 9 are screwed onto the top of each support screw 1, and the two adjusting nuts 9 are arranged at intervals up and down.

[0030] The adjusting plate 6 is arranged in a horizontal plane. A guide hole is provided in the middle of the adjusting plate 6, and an adjusting hole is provided on each of the left and right sides of the guide hole on the adjusting plate 6. The adjusting hole is elongated and extends in the left and right direction. The adjusting plate 6 is sleeved on the two support screws 1 through the two adjusting holes, and the two adjusting nuts 9 on the support screws 1 are respectively arranged on the upper and lower sides of the adjusting plate 6, and the adjusting nuts 9 are pressed against the adjusting plate 6 to fix the adjusting plate 6 on the support screw 1.

[0031] The support member includes a horizontal plate 3 and two vertical plates 4 vertically connected to the bottom surface of the horizontal plate 3. The two vertical plates 4 are parallel to each other and are spaced apart in the left and right direction. Two movable through holes are provided on the horizontal plate 3 and are arranged at intervals in the left and right direction. The movable through holes are elongated and extend in the left and right direction, and the two movable through holes are located outside the two vertical plates 4. The support member is sleeved on the two support screws 1 through the two movable through holes, and the support member is located below the above-mentioned adjusting plate 6.

[0032] As Figure 3As shown, the vertical plate 4 includes a main board section 401 and a fixed plate section 402. The main board section 401 is vertically connected to the bottom of the horizontal plate 3. The bottom of the main board section 401 is provided with a U-shaped notch opening downward. The fixed plate section 402 is bolted to the bottom of the main board section 401. The fixed plate section 402 seals the bottom end of the U-shaped notch. A square through-hole is formed between the top surface of the fixed plate section 402 and the inner wall of the U-shaped notch.

[0033] The guide rod 7 is vertically connected to the top surface of the above-mentioned horizontal plate 3 and is located in the middle of the horizontal plate 3. The guide rod 7 is inserted into the guide hole on the above-mentioned adjusting plate 6.

[0034] The axis of the sprocket 5 extends in the left-right direction. The sprocket 5 is located between the two vertical plates 4 and is rotatably assembled on the two vertical plates 4.

[0035] As Figure 4 shown, the sprocket shaft 10 extends in the left-right direction. The sprocket shaft 10 includes a circular shaft section 1002 in the middle and two square shaft sections 1001 respectively connected to the left and right ends of the circular shaft section 1002. The above-mentioned sprocket 5 is sleeved on the circular shaft section 1002. The two square shaft sections 1001 are respectively inserted into the square through-holes on the above-mentioned two vertical plates 4.

[0036] The elastic member 8 is a helical spring and is a compression spring. The elastic member 8 is sleeved on the above-mentioned guide rod 7. The two ends of the elastic member 8 are respectively connected to the adjusting plate 6 and the horizontal plate 3.

[0037] There are two welding blocks 2. The two welding blocks 2 are respectively screwed onto the bottoms of the above-mentioned two support screws 1. The welding blocks 2 are used for welding to the existing structure.

[0038] When assembling the present utility model, first weld the two welding blocks 2 to the existing structure, then screw the two support screws 1 onto the two welding blocks 2. After that, sleeved the support member with the sprocket 5 onto the two support screws 1, sleeved the elastic member 8 onto the guide rod 7 on the support member. Then screw an adjusting nut 9 onto each of the two support screws 1. Then sleeved the adjusting plate 6 onto the two support screws 1, so that the guide rod 7 passes through the guide hole on the adjusting plate 6. Then screw an adjusting nut 9 onto each of the two support screws 1. Adjust the position of the adjusting plate 6 according to the tightness of the chain until the chain is tightened by the sprocket 5. Then screw the two adjusting nuts 9 to fix the adjusting plate 6 on the support screw 1, completing the assembly of the sprocket 5 tensioning device.

[0039] The present utility model makes the sprocket 5 tighten the chain when the chain is loose by adjusting the position of the adjusting plate 6, and the adjustment method is simple.

[0040] In this embodiment, the welding seat and the support screw 1 are screwed together. In other embodiments, the welding seat and the support screw 1 are fixedly connected.

[0041] In this embodiment, the adjusting plate 6 is provided with an elongated adjusting hole, and the horizontal plate 3 is provided with an elongated movable through hole. In other embodiments, the holes for the support screw 1 to pass through in the adjusting plate 6 and the horizontal plate 3 are both circular through holes.

[0042] Based on the above description of this specification, those skilled in the art can also understand the following terms used, such as the terms indicating orientation or positional relationship, such as "upper", "lower", "front", "rear", "left", "right", "width", "horizontal", "top", "bottom", "inner", "outer", etc. are based on the orientation or positional relationship shown in the drawings of this specification. It is only for the purpose of facilitating the description of the solution of the present invention and simplifying the description, rather than explicitly or implicitly indicating that the device or element involved must have the specific orientation, be constructed and operated in the specific orientation. Therefore, the above terms of orientation or positional relationship cannot be understood or interpreted as a limitation to the solution of the present invention.

[0043] In addition, in the description of this specification, the meaning of "a plurality of" is at least two, such as two, three or more, etc., unless otherwise specifically and clearly defined.

Claims

1. A chain tensioning device, characterized in that: It includes two support screws, an adjusting plate, a support member, a sprocket and an elastic member. The two support screws extend vertically and are arranged at intervals from left to right. The bottom ends of the two support screws are connected with welding blocks. The adjusting plate is movably mounted on the two support screws. Adjustment nuts are threaded on the support screws on the upper and lower sides of the adjusting plate. The adjustment nuts are pressed on the adjusting plate to fix the adjusting plate. The support member is movably mounted on the two support screws. The support member is located below the adjusting plate. The sprocket is rotatably assembled on the support member. The sprocket is located on the side of the support member facing away from the adjusting plate. The elastic member is connected between the adjusting plate and the support member.

2. A chain tensioning device according to claim 1, characterized in that: The top of the support member is connected with a guide rod extending in the up-down direction, the adjustment plate is provided with a guide hole corresponding to the position of the guide rod, and the guide rod is inserted into the guide hole.

3. A chain tensioning device according to claim 2, characterized in that: The elastic member is a coil spring, and the elastic member is sleeved on the outer side of the guide rod.

4. A chain tensioning device according to claim 2, characterized in that: The support member includes a horizontal plate and two vertical plates vertically connected to the bottom of the horizontal plate. The two vertical plates are parallel to each other and arranged at intervals from left to right. The horizontal plate is movably mounted on two supporting screws, the guide rod is vertically connected to the top surface of the horizontal plate, the elastic member is connected between the horizontal plate and the adjusting plate, the sprocket is located between the two vertical plates and rotatably assembled on the two vertical plates, and the sprocket axis extends in the left-right direction.

5. A chain tensioning device according to claim 4, characterized in that: The sprocket is mounted on a sprocket shaft extending from left to right. The sprocket shaft includes a circular shaft section located in the middle and two square shaft sections respectively connected to the left and right ends of the circular shaft section. The sprocket is mounted on the circular shaft section. The vertical plate is provided with a square through hole. The two square shaft sections are respectively inserted into the square through holes on the two vertical plates.

6. A chain tensioning device according to claim 5, characterized in that: The vertical plate includes a main plate section and a fixed plate section. The main plate section is vertically connected to the bottom of the horizontal plate. The bottom of the main plate section is provided with a U-shaped notch opening facing downward. The fixed plate section is connected to the bottom of the main plate section by bolts. The fixed plate section blocks the bottom end of the U-shaped notch. The top surface of the fixed plate section and the inner wall of the U-shaped notch form a square through hole on the vertical plate.

7. A chain tensioner according to any one of claims 4 to 6, characterized in that: The adjustment plate is provided with two elongated adjustment holes arranged at intervals in the left-right direction, the adjustment holes extend in the left-right direction, and the adjustment plate is mounted on the two support screws through the two adjustment holes; the horizontal plate is provided with two movable through holes corresponding to the two adjustment holes above and below, the two movable through holes are both elongated and extend in the left-right direction, and the horizontal plate is mounted on the two support screws through the two movable through holes.

8. A chain tensioner according to any one of claims 1 to 6, characterized in that: The bottom end of the support screw is provided with an external thread, and the welding block is threadedly screwed on the bottom end of the support screw.

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