Crowbar type chain tensioner

Abstract

The utility model provides a crowbar type chain tensioner, and belongs to the technical field of logistics transportation instruments. The chain type tensioner solves the problems that an existing chain type tensioner product is large in size and high in manufacturing cost, and meanwhile larger pre-tightening force can be achieved. The crowbar type chain tensioner comprises a main support, a chain wheel connected to the main support and a chain collecting support capable of driving the chain wheel to rotate during swinging, a chain is wound around the chain wheel, the chain collecting support is in a U-shaped plate shape, the open end of the chain collecting support is rotationally connected to the chain wheel, and the closed end of the chain collecting support is fixedly connected with a crowbar sleeve. One end of the crowbar sleeve faces the chain wheel, and the crowbar sleeve is perpendicular to the chain wheel. When the tensioner is used, a user can achieve pre-tightening of the tensioner more easily through the crowbar, so that operation is more labor-saving and convenient, and larger pre-tightening force can be achieved.

Description

Technical Field

[0001] The utility model belongs to the technical field of logistics and transportation equipment, and relates to a crowbar type chain tensioner. Background Art

[0002] A chain tensioner is a device that uses chains to secure cargo. It has the advantages of high rated load, stable cargo fixation, and long service life. When transporting heavy cargo such as steel coils and cars, chain tensioners can effectively stabilize the cargo, prevent it from moving due to bumps, vibrations, or collisions during transportation, and ensure transportation safety.

[0003] At present, conventional chain tensioners all have a handle for hand holding. By operating the handle of the chain tensioner, the sprocket is driven to move, so that the chain is gradually tightened, so that the cargo on the truck can be fixed. For example, a chain tensioner disclosed in the patent document (application number: 201110112148.0) is composed of a body, a handle, a gear plate, a handle, a chain and a rotating shaft. The handle is hinged to the body through the rotating shaft, and a ratchet is fixedly connected to the rotating shaft. The gear plate is movably connected to the body and the gear plate is embedded in the ratchet. The handle is movably connected to the handle and the handle is embedded in the ratchet. The middle part of the chain is located in the body and is wound around the rotating shaft. Both ends of the chain extend out of the body and a hook 2 is fixed to one end of the chain. The existing handle-type chain tensioner has the following shortcomings in actual use:

[0004] 1. In a handle-type chain tensioner, the handle is a mechanical component used to apply force, and thus requires a sufficient lever length to apply sufficient force for the binding operation. Therefore, the handle of the tensioner is usually made relatively long, which results in a larger overall size of the tensioner, making it inconvenient to carry or transport.

[0005] 2. For handle-type chain tensioners, the handle of the tensioner usually includes two oppositely arranged side pieces to form a handle rod, and the tail end of the handle rod is sleeved or covered with a plastic handle sleeve. As a result, the handle of the tensioner usually has a more complex structure, requiring a more complex process flow and higher material costs, which in turn leads to the problem of high manufacturing costs for handle-type chain tensioners.

[0006] At present, in order to solve the disadvantages of large product size and high cost of existing tensioners, the conventional technical means adopted are:

[0007] 1. In terms of product size design, a retractable handle structure is used. When operating, the handle is pulled outward to make it longer and save effort. When the handle is retracted inward, the size of the product can be reduced. For example, the patent document discloses a "retractable handle for a tensioner (application number: 201820507683.3)";

[0008] 2. In terms of cost reduction, cost reduction is currently usually achieved from structural and process considerations. For example, through integrated design, a metal handle is directly used and the handle grip is integrally formed into a cylindrical shape, thereby eliminating the handle cover and reducing the material and process costs of the plastic-coated handle cover.

[0009] 3. In terms of reducing costs, unnecessary curves and complex shapes are currently reduced in the handle structure design, and straight lines or simple geometric shapes are used to reduce processing difficulty and cost. Summary of the Invention

[0010] The purpose of this utility model is to address the above-mentioned problems in the existing technology and propose a crowbar type chain tensioner. The utility model solves the problems of large size and high manufacturing cost of existing chain type tensioners, and at the same time can achieve greater preload force.

[0011] The purpose of the utility model can be achieved through the following technical solutions: a crowbar type chain tensioner, comprising a main bracket, a sprocket connected to the main bracket and a chain collecting bracket that can drive the sprocket to rotate when swinging, a chain is wound around the sprocket, and it is characterized in that the chain collecting bracket is U-shaped and the open end of the chain collecting bracket is rotatably connected to the sprocket, and the closed end of the chain collecting bracket is fixedly connected to a crowbar sleeve, one end of the crowbar sleeve faces the sprocket and the crowbar sleeve is perpendicular to the sprocket.

[0012] Compared with the existing conventional chain tensioners, this crowbar-type chain tensioner uses a crowbar sleeve and a U-shaped plate-shaped chain-collecting bracket to replace the traditional handle structure. By fixing the crowbar sleeve to the chain-collecting bracket, not only the structure is simplified, but also the manufacturing is more convenient, thereby reducing the manufacturing cost of the product. When using this tensioner, it is only necessary to insert the crowbar into the crowbar sleeve, and the tensioner can be pre-tightened by swinging the crowbar back and forth. At this time, since the crowbar can provide a longer lever length, the length of the chain-collecting bracket can be made smaller, so that the structural design of the tensioner can be more compact. When the crowbar is not in use, the crowbar is pulled out of the crowbar sleeve, making the overall size of the product smaller. In addition, one end of the crowbar sleeve is facing the sprocket and the crowbar sleeve is perpendicular to the sprocket. This design allows the user to better control the applied force and direction, reducing the tilting or swinging of the crowbar sleeve caused by the force application process, and the force applied to the crowbar sleeve by the crowbar can be more effectively converted into the swing of the chain retracting bracket without being wasted on movement in other directions. This direct torque transmission improves the efficiency of the operation, so that the user can more easily pre-tighten the tensioner through the crowbar, so the operation is more labor-saving and convenient, and can achieve a greater pre-tightening force, thereby improving the rated load of the tensioner, so that it can be better suitable for the fixation of heavy goods.

[0013] In the above-mentioned crowbar type chain tensioner, a support plate is fixedly connected to the chain receiving bracket, and one end of the crowbar sleeve facing the sprocket abuts against the support plate and is fixedly connected by welding.

[0014] During use, the crowbar sleeve of this tensioner needs to withstand a large torque. Therefore, not only does it need to prevent deformation of the crowbar sleeve itself, but it also requires good connection stability. In view of this, the tensioner also fixes a connecting support plate on the chain retraction bracket, so that the end of the crowbar sleeve facing the sprocket abuts against the support plate. In this way, during the repeated swinging of the crowbar, the external force applied to the crowbar sleeve is transmitted to the support plate, which in turn supports the crowbar sleeve, thereby further improving the connection stability of the crowbar sleeve. This makes the tensioner stable and reliable in use. The tensioner can better utilize the crowbar to perform chain retraction operations, thereby achieving the purpose of labor-saving operation and at the same time, the tensioner can achieve a greater preload force.

[0015] In the aforementioned crowbar-type chain tensioner, the crowbar sleeve is integrally formed with the chain-collecting bracket; or the crowbar sleeve is inserted into the chain-collecting bracket and welded to the chain-collecting bracket. Specifically, a mounting hole is provided at the closed end of the chain-collecting bracket, and the crowbar sleeve is inserted into the mounting hole and welded to the chain-collecting bracket. This ensures a good connection stability between the crowbar sleeve and the chain-collecting bracket. The abutment between the crowbar sleeve and the support plate further enhances the connection stability of the crowbar sleeve, thereby improving the reliability and rated load of the tensioner. The tensioner can achieve a greater preload force, thereby more stably securing heavy cargo.

[0016] In the above-mentioned crowbar-type chain tensioner, the sprocket is provided with a ratchet portion, and a handle that can be embedded in the tooth groove of the ratchet portion is slidably provided in the chain receiving bracket. The end of the handle facing away from the sprocket has a strip-shaped extension portion, and a guide through-hole is provided on the support plate, and the extension portion is slidably passed through the guide through-hole. In this structure, the extension portion slides through the guide through-hole, so that the support plate also plays a role in guiding the movement of the handle, thereby improving the movement stability of the handle during the use of the product. In other words, the support plate in this tensioner not only has a guiding function, but also plays a role in supporting the crowbar sleeve, achieving dual purposes. This can simplify the structure of the product, make the product structure compact, reduce manufacturing costs, and facilitate the miniaturization of the product.

[0017] In the above-mentioned crowbar-type chain tensioner, the cross-section of the support plate is U-shaped, and the two ends of the support plate are respectively plugged and fixed on the two opposite side walls of the chain collection bracket, and the crowbar sleeve is vertically against the support plate. The cross-section of the support plate is U-shaped, so that the support plate itself has good structural strength. At the same time, the two ends of the support plate are respectively plugged and fixed on the two opposite side walls of the chain collection bracket, ensuring good connection stability between the support plate and the chain collection bracket. Through such a design, the support plate can stably support the crowbar sleeve without being easily deformed, thereby improving the reliability and rated load of the tensioner, and the tensioner can achieve a greater preload force.

[0018] In the aforementioned crowbar-style chain tensioner, the handle comprises two parallel sliding portions that fit within the teeth of the ratchet portion, and a pulling portion bent upward between the two sliding portions. Both sliding portions are mounted on opposing side walls of the chain receiving bracket, sliding radially along the sprocket. These sliding portions guide the movement of the handle, enhancing its stability during use. The pulling portion facilitates user movement, improving the convenience of the product.

[0019] In the above-mentioned crowbar-type chain tensioner, there are two extensions on the handle, and the two extensions are located on both sides of the crowbar sleeve. A reset spring is sleeved on each extension, and the two ends of the reset spring are respectively against the handle and the support plate. The two ends of the reset spring are respectively against the handle and the support plate, so that the handle has a tendency to embed into the tooth groove of the ratchet part. In this way, when the crowbar drives the chain collection bracket to swing, the handle can swing along with it and drive the sprocket to rotate, gradually tightening the chain on the sprocket. The provision of two extensions can further enhance the stability of the handle movement process. At the same time, the two extensions are respectively located on both sides of the crowbar sleeve, which can avoid the crowbar sleeve, thereby facilitating the provision of the crowbar sleeve at the closed end of the chain collection bracket and making the product structure compact, thereby reducing the size of the product.

[0020] In the above-mentioned crowbar-type chain tensioner, both ends of the support plate have plug-in protrusions, and the positions corresponding to each plug-in protrusion on the chain-collecting bracket are respectively provided with plug-in holes. The plug-in protrusions of the support plate are plugged and fixed in the corresponding plug-in holes, and the plug-in protrusions are fixedly welded or tightly fitted to the plug-in holes. The two ends of the support plate are respectively abutted against and fixedly welded to the two side walls opposite to the chain-collecting bracket. Preferably, the plug-in protrusions are fixedly welded to the plug-in holes. The above-mentioned structure provides a larger welding area between the support plate and the chain-collecting bracket, thereby improving the connection stability of the support plate, enabling the support plate to more stably support the crowbar sleeve, further strengthening the connection stability of the crowbar sleeve, and enabling the tensioner to better utilize the crowbar for chain collection operations.

[0021] In the aforementioned crowbar-style chain tensioner, protrusions are integrally formed on both sliding portions of the handle. A strip-shaped guide hole is provided on the chain retractor bracket at a position corresponding to each protrusion. The length of each guide hole is arranged along the radial direction of the sprocket, and the protrusion slides within the corresponding guide hole. By sliding the protrusions within the corresponding guide holes, the movement of the handle is guided, and the guiding effect is good, which can improve the movement stability of the handle during use.

[0022] Compared with the existing technology, this crowbar type chain tensioner has the following advantages:

[0023] 1. This crowbar type chain tensioner uses a crowbar sleeve and a U-shaped plate-shaped chain-collecting bracket to replace the traditional handle structure. By fixing the crowbar sleeve to the chain-collecting bracket, not only the structure is simplified, but also the manufacturing is more convenient, thereby reducing the manufacturing cost of the product.

[0024] 2. When the tensioner is in use, the length of the chain retracting bracket can be made smaller because the crowbar can provide a longer lever length, so that the structural design of the tensioner can be more compact. When the crowbar is not in use, the crowbar is pulled out of the crowbar sleeve, making the overall size of the product smaller.

[0025] 3. When using this tensioner, the user can pre-tighten the tensioner more easily by using a crowbar, so the operation is more labor-saving and convenient, and it can achieve a greater pre-tightening force, thereby increasing the rated load of the tensioner, making it better suitable for fixing heavy goods. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 It is a schematic diagram of the three-dimensional structure of the crowbar type chain tensioner.

[0027] Figure 2 This is a schematic diagram of the three-dimensional structure of the crowbar type chain tensioner after the chain is removed.

[0028] Figure 3 It is a cross-sectional view of the crowbar type chain tensioner.

[0029] Figure 4 It is a partial structural diagram of the crowbar type chain tensioner.

[0030] Figure 5 It is a schematic diagram of the three-dimensional structure of the chain-retracting bracket.

[0031] Figure 6 This is an exploded view of the handle and support plate.

[0032] Figure 7 It is a schematic diagram of the three-dimensional structure of the sprocket.

[0033] In the figure, 1. main bracket; 2. sprocket; 21. ratchet part; 22. axle; 3. chain-collecting bracket; 31. side plate part; 311. plug-in hole; 312. guide sliding hole; 313. connecting hole; 32. connecting part; 321. mounting hole; 4. chain; 5. crowbar sleeve; 6. support plate; 61. guide through hole; 62. plug-in protrusion; 7. handle; 71. sliding part; 72. extension part; 73. pulling part; 74. protrusion; 8. reset spring. DETAILED DESCRIPTION

[0034] The following are specific embodiments of the present invention and the accompanying drawings to further describe the technical solution of the present invention, but the present invention is not limited to these embodiments.

[0035] Example 1

[0036] like Figures 1 to 3 As shown, the present crowbar-type chain tensioner comprises a main frame 1, a sprocket 2 connected to the main frame 1, and a chain receiving frame 3 that can drive the sprocket 2 to rotate when swinging. A chain 4 is wound around the sprocket 2. The chain receiving frame 3 is in the form of a U-shaped plate, and the open end of the chain receiving frame 3 is rotatably connected to the sprocket 2. The closed end of the chain receiving frame 3 is fixedly connected to a crowbar sleeve 5, one end of the crowbar sleeve 5 facing the sprocket 2 and the crowbar sleeve 5 is perpendicular to the sprocket 2. At the same time, a support plate 6 is fixedly connected to the chain receiving frame 3. The end of the crowbar sleeve 5 facing the sprocket 2 abuts against the support plate 6 and is welded to the support plate 6. In this way, when the crowbar is repeatedly swung, the external force applied to the crowbar sleeve 5 is transmitted to the support plate 6, and the support plate 6 supports the crowbar sleeve 5, thereby further improving the connection stability of the crowbar sleeve 5, making the tensioner stable and reliable. The tensioner can better utilize the crowbar to perform the chain receiving operation, thereby achieving the purpose of operating with less effort, and the tensioner can also achieve a greater preload.

[0037] Specifically, such as Figure 3 and Figure 5 As shown, the chain collecting bracket 3 includes two side panels 31 arranged opposite to each other and a connecting portion 32 located between the two side panels. The two side panels 31 are parallel to each other. The connecting portion 32 and the side panels 31 are integrally formed and perpendicular to each other. The support plate 6 is located on the inner side of the connecting portion 32. The closed end of the chain collecting bracket 3 is the connecting portion 32. A mounting hole 321 is provided on the connecting portion 32. The crowbar sleeve 5 is passed through the mounting hole 321 and is welded and fixed to the chain collecting bracket 3, and the crowbar sleeve 5 is perpendicular to the connecting portion 32.

[0038] Combine Figure 1 、 Figure 6 and Figure 7As shown, the sprocket 2 includes an axle 22, with ratchet portions 21 at each end. The ends of the two side panels 31 of the chain receiving bracket 3 are each provided with a connection hole 313. The ends of the axle 22 are rotatably inserted into the connection holes 313 of the two side panels 31, allowing the chain receiving bracket 3 to rotate about the axle 22 of the sprocket 2. A handle 7 is slidably mounted on the chain receiving bracket 3, which fits into the tooth grooves of the ratchet portion 21. The end of the handle 7 facing away from the sprocket 2 has two parallel, strip-shaped extensions 72. The support plate 6 has a U-shaped cross-section, with its ends inserted and fixed to the opposite side walls of the chain receiving bracket 3. The crowbar sleeve 5 rests perpendicularly on the support plate 6. The support plate 6 has two guide holes, with the two extensions 72 slidingly inserted into the two guide holes. In this structure, the support plate 6 also serves to guide the movement of the handle 7, improving the stability of the handle 7 during use. That is to say, the support plate 6 in the tensioner not only has a guiding function, but also can support the crowbar sleeve 5, thus achieving dual purposes.

[0039] like Figures 4 to 6 As shown, both ends of the support plate 6 have insertion protrusions 62. Insertion holes 311 are respectively formed on the chain receiving bracket 3 at positions corresponding to each insertion protrusion 62. The insertion protrusions 62 of the support plate 6 are inserted and fixed in the corresponding insertion holes 311. The insertion protrusions 62 and the insertion holes 311 are welded or tightly fitted. The two ends of the support plate 6 are respectively abutted against and welded to the opposite side walls of the chain receiving bracket 3. In this embodiment, the insertion protrusions 62 are welded to the insertion holes 311, which provides a larger welding area between the support plate 6 and the chain receiving bracket 3, thereby improving the connection stability of the support plate 6 and enabling the support plate 6 to more stably support the crowbar sleeve 5.

[0040] like Figure 6 As shown, the handle 7 includes two parallel sliding parts 71 that can be embedded in the tooth grooves of the ratchet part 21 and a pulling part 73 that is located between the two sliding parts 71 and bent upward. Both sliding parts 71 are set on the two opposite side walls of the chain receiving bracket 3 along the radial direction of the sprocket 2. Figure 3 and Figure 4 As shown, the two extensions 72 of the handle 7 are respectively located on both sides of the crowbar sleeve 5 , and the two extensions 72 are both sleeved with a return spring 8 , and the two ends of the return spring 8 respectively abut against the handle 7 and the support plate 6 .

[0041] like Figures 4 to 6As shown, each of the two sliding portions 71 is integrally formed with a protrusion 74. A strip-shaped guide hole is formed on the chain receiving bracket 3 at a position corresponding to each protrusion 74. The length of the guide hole is arranged along the radial direction of the sprocket 2, and the protrusion 74 is slidably disposed in the corresponding guide hole. By sliding the protrusion 74 in the corresponding guide hole, the movement of the handle 7 is guided, and the guiding effect is good, which can improve the movement stability of the handle 7 during use of the product.

[0042] When using the tensioner, simply insert the crowbar into the crowbar sleeve 5 and swing the crowbar back and forth to pre-tighten the tensioner. Since the crowbar provides a longer lever length, the length of the chain retractor bracket 3 can be made smaller, making the tensioner's structure more compact. When not in use, the crowbar is removed from the crowbar sleeve 5, resulting in a smaller overall product size. Furthermore, one end of the crowbar sleeve 5 faces the sprocket 2 and the crowbar sleeve 5 is perpendicular to the sprocket 2. This design allows the user to better control the force and direction of application, reducing the tilting or swaying of the crowbar sleeve 5 during force application. Furthermore, the force applied by the crowbar to the crowbar sleeve 5 is more effectively converted into the swinging of the chain retractor bracket 3, rather than wasted on movement in other directions. This direct torque transfer improves operational efficiency, allowing the user to more easily pre-tighten the tensioner using the crowbar, resulting in a more labor-saving and convenient operation. Furthermore, a greater pre-tightening force can be achieved, increasing the rated load of the tensioner, making it more suitable for securing heavy cargo.

[0043] Example 2

[0044] The structure and principle of this embodiment are basically the same as those of the first embodiment, except that the crowbar sleeve 5 and the chain retracting bracket 3 are not fixedly connected by welding, but are integrally formed.

[0045] The specific embodiments described herein are merely illustrative of the spirit of the present invention. Those skilled in the art may make various modifications, additions, or substitutions to the described specific embodiments without departing from the spirit of the present invention or exceeding the scope defined by the appended claims.

[0046] Although this document frequently uses terms such as 1. main bracket; 2. sprocket; 21. ratchet portion; 22. axle; 3. chain receiving bracket; 31. side plate; 311. plug hole; 312. guide sliding hole; 313. connection hole; 32. connection portion; 321. mounting hole; 4. chain; 5. pry bar sleeve; 6. support plate; 61. guide through hole; 62. plug-in protrusion; 7. handle; 71. sliding portion; 72. extension portion; 73. pulling portion; 74. protrusion; 8. return spring, the possibility of using other terms is not excluded. These terms are used only to more conveniently describe and explain the essence of the present invention; interpreting them as any additional limitation is contrary to the spirit of the present invention.

Claims

1. A crowbar type chain tensioner, comprising a main support (1), a sprocket (2) connected to the main support (1), and a chain receiving support (3) capable of driving the sprocket (2) to rotate when swinging, wherein a chain (4) is wound around the sprocket (2), and characterized in that: The chain collecting bracket (3) is in a U-shaped plate shape, and the open end of the chain collecting bracket (3) is rotatably connected to the sprocket (2), and the closed end of the chain collecting bracket (3) is fixedly connected to a crowbar sleeve (5), one end of the crowbar sleeve (5) faces the sprocket (2), and the crowbar sleeve (5) is perpendicular to the sprocket (2).

2. The crowbar type chain tensioner according to claim 1, characterized in that: A support plate (6) is fixedly connected inside the chain receiving bracket (3), and one end of the crowbar sleeve (5) facing the sprocket (2) abuts against the support plate (6) and is fixedly connected by welding.

3. The crowbar type chain tensioner according to claim 2, characterized in that: The crowbar sleeve (5) and the chain collecting bracket (3) are integrally formed; or the crowbar sleeve (5) is passed through the chain collecting bracket (3) and is welded and fixedly connected to the chain collecting bracket (3).

4. The crowbar type chain tensioner according to claim 2, characterized in that: The sprocket (2) has a ratchet portion (21), and a handle (7) capable of being embedded in the tooth groove of the ratchet portion (21) is slidably provided in the chain receiving bracket (3), and the handle (7) has a strip-shaped extension portion (72) at one end facing away from the sprocket (2), and a guide through hole (61) is provided on the support plate (6), and the extension portion (72) is slidably penetrated into the guide through hole (61).

5. The crowbar type chain tensioner according to claim 2, 3 or 4, characterized in that: The cross section of the support plate (6) is U-shaped, and the two ends of the support plate (6) are respectively plugged and fixed on the two opposite side walls of the chain receiving bracket (3), and the crowbar sleeve (5) is vertically pressed against the support plate (6).

6. The crowbar type chain tensioner according to claim 4, characterized in that: The handle (7) comprises two sliding parts (71) arranged in parallel and capable of being embedded in the tooth grooves of the ratchet part (21), and a pulling part (73) located between the two sliding parts (71) and bent upward. The two sliding parts (71) are both arranged on two opposite side walls of the chain receiving bracket (3) in a radially sliding manner along the sprocket (2).

7. The crowbar type chain tensioner according to claim 4, characterized in that: There are two extension parts (72) on the handle (7), and the two extension parts (72) are respectively located on both sides of the crowbar sleeve (5). A reset spring (8) is sleeved on the two extension parts (72), and the two ends of the reset spring (8) are respectively against the handle (7) and the support plate (6).

8. The crowbar type chain tensioner according to claim 5, characterized in that: Both ends of the support plate (6) have plug-in protrusions (62), and the chain receiving bracket (3) is provided with plug-in holes (311) at positions corresponding to each plug-in protrusion (62), and the plug-in protrusions (62) of the support plate (6) are plugged and fixed in the corresponding plug-in holes (311).

9. The crowbar type chain tensioner according to claim 8, characterized in that: The plug-in protrusion (62) is welded and fixedly connected to the plug-in hole (311) or tightly fitted, and the two ends of the support plate (6) respectively abut against the two side walls opposite to the chain receiving bracket (3) and are welded and fixedly connected.

10. The crowbar type chain tensioner according to claim 6, characterized in that: The two sliding parts (71) of the handle (7) are integrally formed with a protrusion (74), and a strip-shaped guide sliding hole (312) is respectively opened at a position corresponding to each protrusion (74) on the chain receiving bracket (3), and the length direction of the guide sliding hole (312) is arranged along the radial direction of the sprocket (2), and the protrusion (74) is slidably arranged in the corresponding guide sliding hole (312).

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