Self-locking type tightening bandage with radial compensation function

Abstract

The self-locking type tightening bandage with the radial compensation function comprises an installation locking assembly and a bandage assembly, the installation locking assembly comprises an installation base, kidney-shaped holes are symmetrically formed in the two ends of the installation base, a bolt shaft is arranged in the kidney-shaped hole in the same side in a penetrating mode, two locking rotating shafts are further arranged in the installation base, and the two locking rotating shafts are connected with the bandage assembly. An extension spring is arranged between the bolt shaft and the locking rotating shaft on the same side, two ends of the locking rotating shaft extend out of the mounting base, and one end of the locking rotating shaft is sleeved with a ratchet mechanism; the binding band assembly comprises a stainless steel binding band upper section and a stainless steel binding band lower section, the bolt shafts on the two sides are sleeved with the two ends of the stainless steel binding band upper section respectively, and the stainless steel binding band lower section is arranged on the arc-shaped groove in the middle of the installation base. Through the arrangement of the spring and the kidney-shaped hole, the binding belt can be compensated in the radial direction, and the ratchet mechanism can be kept in a locking state within an allowable limit pre-tightening force range.

Description

Technical Field

[0001] The utility model discloses a fixing device, in particular to a self-locking tightening strap with a radial compensation function, whose working size and clamping force can be adaptively adjusted to meet the requirements of the compact space layout of fuel cell vehicles. The upper section of the strap is integral, which can achieve a more round and smooth inner contact compared with the segmented type, and can provide a larger effective binding area when binding the storage tank. Background Art

[0002] In recent years, significant breakthroughs have been made in the development and utilization technology of hydrogen energy represented by fuel cells, providing an important solution for achieving zero-emission energy utilization. For example, a hydrogen fuel cell vehicle with several hydrogen storage tanks (such as a "3+3+1" planar layout for 10 hydrogen storage tanks) configured as the power source, and the tank body of the hydrogen storage tank is made of carbon fiber material to meet the requirements of its lightweight design. During use, the tank body will expand or contract, that is, when the rated volume of hydrogen (the total weight of a single hydrogen storage tank after being filled with the rated volume of hydrogen usually reaches 200 kg) is filled into the tank, its outer diameter will increase accordingly; as the hydrogen in the hydrogen storage tank is continuously consumed, its outer diameter will gradually decrease. Therefore, in actual application, the variation amplitude of the outer diameter of the hydrogen storage tank is generally designed within the range of ±5 mm.

[0003] Currently, in the application of the fuel storage tank fixing technology of hydrogen fuel cell vehicles, a split-type fixing device is adopted. On the one hand, part of the effective contact area between the inner side of the strap and the tank body is lost, resulting in a relatively small effective binding area; on the other hand, the free end of the bolt of the bolt locking assembly of the split-type fixing device extends too long in the locked state, which will cause mechanical interference with the outer surface of the adjacent tank, and there are certain usage limitations and safety hazards. Summary of the Invention

[0004] The purpose of the utility model is to overcome the above deficiencies and provide a fuel storage tank fixing device whose working size and clamping force can be adaptively adjusted to meet the requirements of the compact space layout of fuel cell vehicles.

[0005] The purpose of the utility model is achieved by the following technical solutions:

[0006] A self-locking tightening strap with radial compensation function, comprising an installation and locking assembly and a strap assembly. The installation and locking assembly includes an installation base. At both ends of the installation base, waist-shaped holes are symmetrically provided. A bolt shaft is inserted through the waist-shaped holes on the same side. Two locking rotating shafts are also provided in the installation base. A tension spring is arranged between the bolt shaft and the locking rotating shaft on the same side. Both ends of the locking rotating shaft extend out of the installation base. A ratchet mechanism is sleeved on one end, and the ratchet mechanism includes a pawl fixing plate and a ratchet fixed on the locking rotating shaft. A pawl is fixed on the upper part of the pawl fixing plate, and the pawl matches the ratchet. The other end is limited by a pin; the strap assembly includes an upper section of stainless steel strap and a lower section of stainless steel strap. The two ends of the upper section of stainless steel strap are respectively sleeved on the bolt shafts on both sides, and the lower section of stainless steel strap is placed on the arc-shaped groove in the middle of the installation base.

[0007] A further improvement of the utility model lies in that: the bolt shaft is an external hexagonal bolt shaft and is fixed in the installation base through a flat washer and an external hexagonal nut.

[0008] A further improvement of the utility model lies in that: two cylindrical tension springs are arranged between the bolt shaft and the locking rotating shaft on the same side, that is, a total of four cylindrical tension springs are provided in the installation base.

[0009] A further improvement of the utility model lies in that: the pawl is fixed on the pawl fixing plate through an internal hexagonal socket head screw and an external hexagonal nut.

[0010] A further improvement of the utility model lies in that: a locking round bar is inserted through the other ends of the two locking rotating shafts.

[0011] A further improvement of the utility model lies in that: a rubber soft spacer is provided on the inner wall of the upper section of stainless steel strap.

[0012] The utility model has the following advantages compared with the prior art:

[0013] 1. Through the setting of the spring and the waist-shaped hole, the strap of the utility model can obtain radial compensation.

[0014] 2. The ratchet mechanism can maintain the locked state within the allowable limit pre-tightening force range.

[0015] 3. The rubber soft spacer can assist in providing a limited compensation amount. Description of the Drawings

[0016] Figure 1 is the structural schematic diagram of the utility model;

[0017] Figure 2 is the structural schematic diagram of the installation and locking assembly;

[0018] Figure 3 is the structural schematic diagram of the ratchet mechanism;

[0019] Figure 4 Structural schematic diagram of the strap assembly

[0020] Reference numerals in the figure: 1 - Installation and locking assembly, 1-1 - Installation base, 1-2 - Bolt shaft, 1-3 - Tension spring, 1-4 - Locking rotating shaft, 1-5 - Pin, 1-6 - Locking round bar, 1-7 - Flat washer, 1-8 - Hexagon nut, 1-9 - Pawl fixing plate, 1-10 - Ratchet wheel, 1-11 - Pawl, 1-12 - Socket head cap screw, 1-13 - Hexagon nut, 1-14 - Slots, 2 - Strap assembly, 2-1 - Upper section of stainless steel strap, 2-2 - Rubber soft spacer, 2-3 - Lower section of stainless steel strap Specific embodiments

[0021] In order to make the objectives, technical solutions and advantages of the embodiments of the present utility model clearer, the technical solutions in the embodiments of the present utility model will be clearly and completely described below. Obviously, the described embodiments are some, but not all, of the embodiments of the present utility model. The elements and features described in one embodiment of the present utility model may be combined with the elements and features shown in one or more other embodiments. It should be noted that, for the sake of clarity, the representation and description of components and processes that are irrelevant to the present utility model and are known to those of ordinary skill in the art are omitted in the description. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the scope of protection of the present utility model

[0022] The following further describes the present utility model in conjunction with the accompanying drawings: A self-locking tightening strap with a radial compensation function, including an installation and locking assembly 1 and a strap assembly 2. The installation and locking assembly 1 includes an installation base 1-1. At both ends of the installation base 1-1, waist-shaped holes 1-14 are symmetrically provided. A bolt shaft 1-2 is inserted through the waist-shaped holes 1-14 on the same side. In the installation base 1-1, there are also two locking rotating shafts 1-4. A tension spring 1-3 is provided between the bolt shaft 1-2 and the locking rotating shaft 1-4 on the same side. If there are two cylindrical tension springs 1-3 on the same side, that is, a total of four cylindrical tension springs 1-3 are provided in the installation base 1-1. The bolt shaft 1-2 is an external hexagon bolt shaft and is fixed in the installation base 1-1 through a flat washer 1-7 and an external hexagon nut 1-8. Both ends of the locking rotating shaft 1-4 extend out of the installation base 1-1. A ratchet mechanism is sleeved on one end. The ratchet mechanism includes a pawl fixing plate 1-9 and a ratchet 1-10 fixed on the locking rotating shaft 1-4. A pawl 1-11 is fixed on the upper part of the pawl fixing plate 1-9. The pawl 1-11 matches the ratchet 1-10. The pawl 1-11 is fixed on the pawl fixing plate 1-9 through an internal hexagon socket head screw 1-12 and an external hexagon nut 1-13. The other end is limited by a pin 1-5. The strap assembly 2 includes an upper section 2-1 of a stainless-steel strap and a lower section 2-3 of a stainless-steel strap. The two ends of the upper section 2-1 of the stainless-steel strap are respectively sleeved on the bolt shafts 1-2 on both sides. The lower section 2-3 of the stainless-steel strap is placed on the arc-shaped groove in the middle of the installation base 1-1. A rubber soft spacer 2-2 is provided on the inner wall of the upper section 2-1 of the stainless-steel strap. The rubber soft spacer (mainly used for mechanical protection of the outer surface of the tank) can also assist in providing a limited compensation amount.

[0023] The compensation amount for the variation amplitude of the outer diameter of the tank is mainly provided by the elongation of the tension springs symmetrically arranged on the installation base. The bolt shaft can reciprocate within the range of the corresponding designed waist-shaped holes on the installation base under the action of the spring tension and the radial deformation force of the strap. The present utility model is applicable to the tightening straps of large-sized tanks with a circular cross-section and can be used in combination according to the axial dimensions of the tank.

[0024] According to the working characteristics of the ratchet mechanism that only allows one-way rotation and locks in the reverse direction, a corresponding ratchet mechanism is designed and implemented. By using a simple installation tool to apply a rated torque along the direction allowed by the ratchet mechanism, locking can be easily achieved, and it can maintain the locked state within the limit pre-tightening force range allowed by the ratchet mechanism. The installation tool is a locking round bar, that is, a locking round bar 1-6 is inserted through the other ends of the two locking rotating shafts 1-4. When needed, it can be taken down at any time, and the installation torque can be increased by using the principle of the lever arm of the lengthened lever.

[0025] In the application of the fuel tank fixing technology of hydrogen fuel cell vehicles, compared with the segmented fixing device, it can achieve a more round and smooth inner contact, and provide a larger effective binding area when binding the fuel tank to ensure a high-quality fixed connection between the tank body and the basic frame of the fuel storage station; in addition, the ratchet mechanism locking assembly of the present utility model is built into the installation base, which completely avoids the problem that the free end of the bolt of the bolt locking assembly of the split fixing device extends too long in the locked state and causes mechanical interference with the outer surface of the adjacent tank body.

[0026] Finally, it should be noted that: Although the present utility model and its advantages have been described in detail above, it should be understood that various changes, substitutions and transformations can be made without exceeding the spirit and scope of the present utility model as defined by the appended claims. Moreover, the scope of the present utility model is not limited to the specific embodiments of the processes, devices, means, methods and steps described in the specification. Those of ordinary skill in the art will readily understand from the disclosure of the present utility model that processes, devices, means, methods or steps that can perform substantially the same functions or achieve substantially the same results as the corresponding embodiments described herein can be used according to the present utility model, whether existing or to be developed in the future. Therefore, the appended claims are intended to cover such processes, devices, means, methods or steps within their scope.

Claims

1. A self-locking tightening strap with radial compensation function, comprising an installation and locking assembly (1) and a strap assembly (2), characterized in that: The installation and locking assembly (1) includes an installation base (1-1). Waist-shaped holes (1-14) are symmetrically provided at both ends of the installation base (1-1). A bolt shaft (1-2) is inserted through the waist-shaped holes (1-14) on the same side. Two locking rotating shafts (1-4) are also provided in the installation base (1-1). A tension spring (1-3) is provided between the bolt shaft (1-2) and the locking rotating shaft (1-4) on the same side. Both ends of the locking rotating shaft (1-4) extend out of the installation base (1-1). A ratchet mechanism is sleeved on one end. The ratchet mechanism includes a pawl fixing plate (1-9) and a ratchet (1-10) fixed on the locking rotating shaft (1-4). A pawl (1-11) is fixed on the upper part of the pawl fixing plate (1-9). The pawl (1-11) matches the ratchet (1-10). The other end is limited by a pin (1-5). The strap assembly (2) includes an upper stainless steel strap section (2-1) and a lower stainless steel strap section (2-3). Both ends of the upper stainless steel strap section (2-1) are respectively sleeved on the bolt shafts (1-2) on both sides. The lower stainless steel strap section (2-3) is placed on the arc-shaped groove in the middle of the installation base (1-1).

2. The self-locking tightening strap with radial compensation function according to claim 1, wherein: The bolt shaft (1-2) is an external hexagon bolt shaft and is fixed in the installation base (1-1) through a flat washer (1-7) and an external hexagon nut (1-8).

3. The self-locking tightening strap with radial compensation function according to claim 1, characterized in that: Two cylindrical tension springs (1-3) are provided between the bolt shaft (1-2) and the locking rotating shaft (1-4) on the same side. That is, a total of four cylindrical tension springs (1-3) are provided in the installation base (1-1).

4. The self-locking tightening strap with radial compensation function according to claim 1, characterized in that: The pawl (1-11) is fixed on the pawl fixing plate (1-9) through an internal hexagon socket head screw (1-12) and an external hexagon nut (1-13).

5. The self-locking tightening strap with radial compensation function according to claim 1, characterized in that: A locking round bar (1-6) is inserted through the other ends of the two locking rotating shafts (1-4).

6. The self-locking tightening strap with radial compensation function according to claim 1, characterized in that: A rubber soft spacer (2-2) is provided on the inner wall of the upper stainless steel strap section (2-1).

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