Tension testing tool

Abstract

The utility model relates to the technical field of testing tools, in particular to a tension testing tool which comprises a frame and a fixing plate fixedly installed in the frame. A fixing plate is arranged in the frame, a guide assembly is movably connected to the middle of the fixing plate, an upper moving plate and a lower moving plate are arranged at the two ends of the guide assembly respectively, and an installation space is formed between the lower moving plate and the fixing plate. The jack only needs to be placed on the lower moving plate, and the shaft end of the jack abuts against the fixing plate. The jack exerts force to reversely push the lower moving plate to move downwards, the upper moving plate and the connecting base on the frame are driven to move relatively through the guide assembly, and therefore the steel wire rope is tensioned, and the tension sensor can be detected. Compared with a traditional fixed hydraulic driving scheme needing complex pipeline connection, the tool gets rid of limitation of installation scenes, and detection can be completed only by flexibly placing one jack.

Description

Technical Field

[0001] This utility model relates to the field of testing fixture technology, and in particular to a tension testing fixture. Background Technology

[0002] In underground coal mines, the stable operation of belt conveyors and wire rope traction equipment is crucial. Abnormal belt tension or wire rope tension may indicate equipment failure or safety hazards; therefore, real-time and accurate monitoring is key to ensuring safe production in the mine.

[0003] To address this, the industry has developed intrinsically safe tension sensors for mining applications. These sensors are typically based on the beam resistance strain principle and equipped with guide wheels to detect the tension of conveyor belts or wire ropes and convert it into electrical signals. For example, Chinese Patent Publication No. CN207215327U discloses an intrinsically safe tension sensor for wire ropes.

[0004] However, sensors must undergo rigorous testing before leaving the factory to ensure reliability. Currently, commonly used testing fixtures employ built-in hydraulic cylinders to tension and load the wire rope, simulating actual stress conditions. However, this fixed hydraulic drive method relies on an external hydraulic source and a complex pipeline connection system, which limits its application scenarios, makes it inconvenient to carry, and fails to meet the needs of convenient production testing, thus affecting testing efficiency and flexibility.

[0005] Based on this, in order to improve the convenience of testing, we propose a tension testing fixture. Utility Model Content

[0006] The purpose of this invention is to address the aforementioned shortcomings in the existing technology by proposing a tension testing fixture.

[0007] To achieve the above objectives, the present invention adopts the following technical solution:

[0008] Design a tension testing fixture, including:

[0009] The frame and the fixing plate fixedly installed in the frame;

[0010] A guide assembly is movably connected to the middle of the fixed plate. An upper movable plate and a lower movable plate are respectively provided at both ends of the guide assembly. An installation space is formed between the lower movable plate and the fixed plate.

[0011] The inner top of the frame and the upper end of the upper movable plate are both fixedly connected to a connecting seat, and a steel wire rope is connected between the two connecting seats. The tension sensor is installed on the outside of the steel wire rope.

[0012] Furthermore, the guide assembly includes a plurality of guide posts passing through the fixed plate, the two ends of the guide posts passing through the upper moving plate and the lower moving plate respectively, and being locked by nuts.

[0013] Furthermore, the two ends of the wire rope are bent back to form head loops respectively, and the wire rope and its head ends are locked and fixed by fasteners. A pin is inserted through the head loop on the end face of the connecting seat, and the pin is positioned on the connecting seat by a locking member.

[0014] Furthermore, it also includes a protective component positioned in front of the frame to protect the wire rope.

[0015] Furthermore, the protective component includes a grating plate, which is slidably connected to the front end of the frame. A positioning hole is provided at the front end of the grating plate, and two spring plugs are embedded at the front end of the frame. The telescopic ends of the spring plugs are inserted into the positioning hole.

[0016] Furthermore, a positioning plate is fixedly installed at the front end of the frame. The positioning plate is used to position the grid plate downwards. A rubber pad is provided on the end face of the positioning plate.

[0017] The tension testing fixture proposed in this invention has the following advantages: By designing an installation space inside the frame for placing a jack, during testing, the jack is simply placed on the lower moving plate, with its shaft end pressing against the fixed plate. The force applied by the jack pushes the lower moving plate downwards, and through the guide assembly, it causes the upper moving plate and the connecting seat on the frame to move relative to each other, thereby tightening the steel wire rope. This allows for the detection of the tension sensor. Compared to traditional fixed hydraulic drive solutions that require complex piping connections, this fixture eliminates the limitations of the installation scenario; only a single jack needs to be placed to complete the test, greatly improving the convenience of testing. Attached Figure Description

[0018] Figure 1 This is a perspective view of the present utility model;

[0019] Figure 2 for Figure 1 A magnified structural diagram of area A;

[0020] Figure 3 This is the front view of the present invention;

[0021] Figure 4 This is a schematic diagram of the wire rope structure of this utility model.

[0022] In the diagram: 1. Frame; 2. Fixing plate; 3. Guide assembly; 31. Guide post; 32. Nut; 4. Upper moving plate; 5. Lower moving plate; 51. Installation space; 6. Connecting seat; 7. Wire rope; 71. Head ring; 72. Pin; 73. Locking component; 8. Tension sensor; 9. Protective assembly; 91. Grating plate; 92. Positioning hole; 93. Spring plug; 94. Positioning plate; 95. Rubber pad. Detailed Implementation

[0023] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments.

[0024] Reference Figure 1-4 As an embodiment of the present invention, a tension testing fixture is disclosed. Specifically, the tension testing fixture is mainly used to test the working condition of an intrinsically safe tension sensor. The fixture includes a frame 1 and a fixing plate 2 fixedly installed in the frame 1.

[0025] A guide assembly 3 is movably connected to the middle of the fixed plate 2. An upper movable plate 4 and a lower movable plate 5 are respectively provided at both ends of the guide assembly 3. An installation space 51 is formed between the lower movable plate 5 and the fixed plate 2.

[0026] It should be noted that the installation space 51 described in this embodiment is for installing the jack. In the actual installation process, by placing the jack on the upper end of the lower moving plate 5 and having the shaft end of the jack abut against the fixed plate 2, the lower moving plate 5 can be pushed downward in the opposite direction. With the help of the connection with the guide component 3, the upper moving plate 4 and the two connecting seats 6 on the frame 1 can be moved relative to each other, so as to tighten the wire rope 7.

[0027] The inner top of the frame 1 and the upper end of the upper moving plate 4 are both fixedly connected to a connecting seat 6, and a steel wire rope 7 is connected between the two connecting seats 6. The tension sensor 8 is installed on the outside of the steel wire rope 7.

[0028] During testing, the tension sensor 8 to be tested is first installed on the outside of the wire rope 7. The specific structure and installation method of the tension sensor 8 are standard practices for those skilled in the art and will not be elaborated here.

[0029] In some embodiments, the guide component 3 of this utility model includes a plurality of guide posts 31 passing through the fixed plate 2. The two ends of the guide posts 31 pass through the upper moving plate 4 and the lower moving plate 5 respectively, and are locked by nuts 32. Specifically, in this embodiment, there are four guide posts 31 distributed in a matrix on the fixed plate 2. Each guide post 31 has a pair of nuts 32 threaded to both ends. By locking and fixing the upper moving plate 4 and the lower moving plate 5 with a pair of nuts 32, the distance between the two can be relatively fixed. At the same time, the distance between the upper moving plate 4 and the lower moving plate 5 can be adaptively adjusted by adjusting the position of the nuts 32.

[0030] Furthermore, in this embodiment, the two ends of the wire rope 7 are bent back to form head loops 71 respectively. The wire rope 7 and its head end are locked and fixed by fasteners. In this example, the fasteners can be rope clips or compression sleeves. The fixing method is a conventional means in the art and will not be described in detail here. A pin 72 is inserted through the head loop 71 on the end face of the connecting seat 6. The pin 72 is positioned on the connecting seat 6 by a locking member 73. Preferably, the locking member 73 in this embodiment is a retaining spring. Two retaining springs are provided and are engaged in the retaining groove at the end of the pin 72. Of course, in other embodiments, the locking member 73 can also be an open retaining pin. In this case, an opening needs to be made at the end of the pin 72 for adaptation. The design of the locking member 73 can prevent the pin 72 from falling off the connecting seat 6, thereby improving the stability of the test.

[0031] In addition, to prevent the steel wire rope 7 from breaking and injuring people during the test, this utility model also includes a protective component 9, which is placed in front of the frame 1 to protect the steel wire rope 7.

[0032] Specifically, the protective component 9 in this utility model includes a grid plate 91, which is slidably connected to the front end of the frame 1. Of course, the sliding method can be a guide rail and slider cooperation method or a slide groove and slider cooperation method. Those skilled in the art can choose according to actual needs, which will not be elaborated here. A positioning hole 92 is provided at the front end of the grid plate 91, and two spring plugs 93 are embedded at the front end of the frame 1. The telescopic ends of the spring plugs 93 are inserted into the positioning hole 92. In this embodiment, the telescopic ends of the spring plugs 93 are cylindrical to ensure stable engagement with the positioning hole 92.

[0033] In this embodiment, a grating plate 91 that can slide up and down is used to protect the front side of the wire rope 7 during the test. Preferably, the grating plate 91 in this embodiment can be a stainless steel plate.

[0034] After the tension sensor 8 is installed, the upper spring plug 93 can be pressed to retract it. At this time, the grid plate 91 is no longer restricted and can slide downward. When the grid plate 91 slides to the lower side, it engages with the telescopic end of the lower spring plug 93, thus locking and positioning the grid plate 91 at the lower side.

[0035] In addition, in order to position the downward sliding position of the grating plate 91, a positioning plate 94 is fixedly installed at the front end of the frame 1 in this embodiment. The positioning plate 94 is used to position the grating plate 91 downward. A rubber pad 95 is provided on the end face of the positioning plate 94. The design of the rubber pad 95 can play a certain shock absorption and protection effect. When the grating plate 91 slides downward, the lower spring plug 93 is pressed first until the grating plate 91 slides into place. Then, its telescopic end engages with the positioning hole on the grating plate 91, thus completing the lower position positioning. The operation is simple and convenient.

[0036] In summary, this utility model incorporates an installation space 51 within the frame 1 for placing a jack. During testing, the jack is simply placed on the lower moving plate 5, with its shaft end pressing against the fixed plate 2. The force applied by the jack pushes the lower moving plate 5 downwards, which, through the guide assembly 3, causes the upper moving plate 4 and the connecting seat 6 on the frame 1 to move relative to each other, thereby tightening the steel wire rope 7. This allows for the detection of the tension sensor 8. Compared to traditional fixed hydraulic drive solutions that require complex piping connections, this fixture eliminates the limitations of the installation scenario, requiring only the flexible placement of a single jack to complete the test, greatly improving the convenience of testing.

[0037] The above description is only a preferred embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. Any equivalent substitutions or changes made by those skilled in the art within the technical scope disclosed in the present utility model, based on the technical solution and the inventive concept of the present utility model, should be included within the protection scope of the present utility model.

Claims

1. A tension testing fixture, characterized in that, include: A frame (1) and a fixing plate (2) fixedly installed in the frame (1); A guide assembly (3) is movably connected to the middle of the fixed plate (2). An upper movable plate (4) and a lower movable plate (5) are respectively provided at both ends of the guide assembly (3). An installation space (51) is formed between the lower movable plate (5) and the fixed plate (2). The inner top of the frame (1) and the upper end of the upper moving plate (4) are both fixedly connected to a connecting seat (6), and a steel wire rope (7) is connected between the two connecting seats (6). The tension sensor (8) is installed on the outside of the steel wire rope (7).

2. The tension testing fixture according to claim 1, characterized in that: The guide assembly (3) includes a plurality of guide posts (31) passing through the fixed plate (2), the two ends of the guide posts (31) passing through the upper moving plate (4) and the lower moving plate (5) respectively, and being locked by nuts (32).

3. The tension testing fixture according to claim 1, characterized in that: The two ends of the wire rope (7) are bent back to form head loops (71) respectively. The wire rope (7) and its head end are locked and fixed by fasteners. A pin (72) that passes through the head loop (71) is inserted into the end face of the connecting seat (6). The pin (72) is positioned on the connecting seat (6) by a locking member (73).

4. The tension testing fixture according to claim 1, characterized in that: It also includes a protective component (9) placed in front of the frame (1) for protecting the wire rope (7).

5. A tension testing fixture according to claim 4, characterized in that: The protective component (9) includes a grid plate (91), which is slidably connected to the front end of the frame (1). A positioning hole (92) is provided at the front end of the grid plate (91). Two spring plugs (93) are embedded at the front end of the frame (1). The telescopic ends of the spring plugs (93) are inserted into the positioning hole (92).

6. The tension testing fixture according to claim 5, characterized in that: A positioning plate (94) is also fixedly installed at the front end of the frame (1). The positioning plate (94) is used to position the grid plate (91) downward. A rubber pad (95) is provided on the end face of the positioning plate (94).

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