Plastic sheet tensile test equipment

Abstract

The invention relates to plastic sheet tensile test equipment which comprises a rack, a lifting plate driven by a hydraulic mechanism to ascend and descend in an inner cavity of the rack and a guide rail fixed to the side edge of the rack, and an inner cavity of the guide rail is slidably connected with a sliding plate. Clamping mechanisms for clamping sheets are arranged on the side edges of the sliding plate and the lifting plate; the invention relates to the technical field of plastic sheet testing. According to the plastic sheet tensile test equipment, two clamping mechanisms form a group to respectively clamp the upper part and the lower part of a sheet, a plurality of sheets are subjected to a tensile test at one time through a single driving mechanism, mutual interference is avoided, higher torque is provided at a low rotating speed, the tensile force is larger, and the positioning is accurate.

Description

Technical Field

[0001] The invention relates to the technical field of plastic sheet testing, in particular to a plastic sheet tensile testing device. Background Art

[0002] The plastic tensile testing device mainly slides in the same slide rail with the upper and lower clamps, thereby reducing the probability of shaking during the stretching process. When performing a tensile test on a plastic sheet, a tensile testing device is usually used to clamp the two ends of a single plastic sheet sample and pull it until the plastic sheet sample is broken. However, the current tensile testing device is difficult to test a large number of plastic sheet samples simultaneously, which affects the tensile testing efficiency of the plastic sheet samples, and the forces between them interfere with each other. There is also a risk of falling off and sliding during pulling, which affects the normal detection effect. Summary of the invention

[0003] In view of the deficiencies in the prior art, the present invention provides a plastic sheet tensile testing device to solve the above-mentioned problems.

[0004] To achieve the above objectives, the present invention is implemented through the following technical solutions: A plastic sheet tensile testing device, comprising a frame, a lifting plate driven to rise and fall by a hydraulic mechanism in the inner cavity of the frame, and a guide rail fixed to the side of the frame, wherein the inner cavity of the guide rail is slidably connected with a sliding plate, and the sides of the sliding plate and the lifting plate are both provided with a clamping mechanism for clamping the sheet;

[0005] The clamping mechanism comprises a double-rod clamping cylinder respectively fixed to the sides of the sliding plate and the lifting plate, the end of the piston rod of the double-rod clamping cylinder is fixedly connected to a side clamping plate, the side of the side clamping plate close to the sheet is fixedly connected to an inner plate, the side of the inner plate is fixedly connected to a plurality of electric heating blocks, and one side of the double-rod clamping cylinder is fixedly connected to a limit frame for limiting the sheet;

[0006] The top of the frame is rotatably connected to a driving shaft driven by a motor, and a pull rope is fixedly connected to the surface of the driving shaft, and the bottom end of the pull rope is fixedly connected to the top of the sliding plate. When performing the inspection, the sheet is first inserted into the limit frame of the clamping mechanism below, and then the double-rod clamping cylinder of the clamping mechanism below is started. At this time, the two electric heating blocks are heated and then inserted into the sheet, and then the side clamps on both sides clamp the bottom of the sheet. At this time, the electric heating blocks are turned off, and the electric heating blocks are embedded in the sheet and then shaped to increase the pulling force on the sheet, and then the lifting plate rises, driving the sheet to move upward and move to the limit frame below the double-rod clamping cylinder above, and then repeat the above operation. The upper clamping mechanism clamps the sheet, and then the motor is started to drive the driving shaft to rotate, and the pull rope is tightened to perform a pulling test on the sheet. A single driving mechanism can be used to perform a tensile test on multiple sheets at one time, and there will be no interference between them, and the positioning is accurate. The embedded electric heating blocks are combined with the clamping of the side clamps on both sides to effectively prevent the plastic sheet from slipping and falling off, and the detection accuracy is higher.

[0007] As a further solution of the present invention: the electric heating blocks on the embedded plates on both sides are staggered left and right, and are hot-melted into the inside of the sheet at different positions on both sides, which has a stronger clamping force and can prevent the sheet from being pierced and broken.

[0008] As a further solution of the present invention: a plurality of clamping mechanisms are provided, and are symmetrically arranged one by one on the surface of the sliding plate and the lifting plate, respectively, and a group of two clamping mechanisms clamps the upper and lower parts of the sheet respectively.

[0009] As a further solution of the present invention: a dynamometer is provided on each of the pull ropes, and the final force applied when the sheet is broken is detected by the design of the dynamometer.

[0010] As a further solution of the present invention: the drive shaft is driven by a stepper motor with a transmission, and a low rotation speed provides greater torque and greater pulling force.

[0011] As a further solution of the present invention: the limiting frame is a rectangular hollow frame with a notch on one side. Through the setting of the limiting frame, the sheet material can be simply positioned after being inserted into it.

[0012] Compared with the prior art, the present invention has the following beneficial effects:

[0013] 1. In the present invention, two clamping mechanisms are used in a group to clamp the upper and lower parts of the sheet respectively, and a single driving mechanism is used to perform tensile tests on multiple sheets at one time without interfering with each other. The low speed provides greater torque, greater pulling force, and precise positioning.

[0014] 2. The present invention uses an embedded electric heating block to hold the side clamps on both sides, and hot melts the two sides into the sheet at different positions, which increases the clamping force and prevents the sheet from being pierced and broken. It can effectively prevent the plastic sheet from slipping and falling off, and has higher detection accuracy. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a structural schematic diagram of the present invention;

[0016] Figure 2 It is a structural schematic diagram of the detection state of the present invention;

[0017] Figure 3 It is a structural schematic diagram of the clamping mechanism of the present invention;

[0018] Figure 4 It is a schematic structural diagram of the inner embedded panel of the present invention.

[0019] In the figure: 1, frame; 2, guide rail; 3, lifting plate; 4, clamping mechanism; 5, driving shaft; 6, pull rope; 7, sliding plate; 41, double-rod clamping cylinder; 42, limit frame; 43, side clamping plate; 44, embedded plate; 45, electric heating block. DETAILED DESCRIPTION

[0020] In order to further explain the technical means and effects adopted by the present invention to achieve the predetermined invention purpose, the specific implementation mode, structure, characteristics and effects of the present invention are described in detail below in combination with the accompanying drawings and preferred embodiments.

[0021] See also Figure 1-4 The present invention provides a technical solution: a plastic sheet tensile testing device, comprising a frame 1, a lifting plate 3 driven to rise and fall by a hydraulic mechanism in the inner cavity of the frame 1, and a guide rail 2 fixed to the side of the frame 1, the inner cavity of the guide rail 2 is slidably connected with a sliding plate 7, and the sides of the sliding plate 7 and the lifting plate 3 are both provided with a clamping mechanism 4 for clamping the sheet;

[0022] The clamping mechanism 4 comprises a double-rod clamping cylinder 41 respectively fixed to the sides of the sliding plate 7 and the lifting plate 3, the end of the piston rod of the double-rod clamping cylinder 41 is fixedly connected to a side clamping plate 43, the side of the side clamping plate 43 close to the sheet is fixedly connected to an inner plate 44, the side of the inner plate 44 is fixedly connected to a plurality of electric heating blocks 45, and one side of the double-rod clamping cylinder 41 is fixedly connected to a limiting frame 42 for limiting the sheet;

[0023] The top of the frame 1 is rotatably connected to a drive shaft 5 driven by a motor, and a pull rope 6 is fixedly connected to the surface of the drive shaft 5, and the bottom end of the pull rope 6 is fixedly connected to the top of the sliding plate 7. When testing, the sheet is first inserted into the limit frame 42 of the clamping mechanism 4 below, and then the double-rod clamping cylinder 41 of the clamping mechanism 4 below is started. At this time, the two electric heating blocks 45 are heated and then inserted into the sheet, and then the side clamps 43 on both sides clamp the bottom of the sheet. At this time, the electric heating block 45 is turned off, and the electric heating block 45 is embedded in the sheet and then shaped to increase the pulling force on the sheet, and then The rear lifting plate 3 rises, driving the sheet to move upward and move it into the limit frame 42 below the upper double-rod clamping cylinder 41, and then repeats the above operation. The upper clamping mechanism 4 clamps the sheet, and then the motor is started to drive the drive shaft 5 to rotate, and the pull rope 6 is tightened to perform a pulling test on the sheet. A single driving mechanism can be used to perform a tensile test on multiple sheets at one time without interfering with each other, and the positioning is precise. The embedded electric heating block 45 and the clamping of the side clamps 43 on both sides can effectively prevent the plastic sheet from slipping and falling off, and the detection accuracy is higher.

[0024] The electric heating blocks 45 on the inner panels 44 on both sides are staggered left and right, and are hot-melted into the inside of the sheet at different positions on both sides, which has a stronger clamping force and can prevent the sheet from being pierced and broken.

[0025] There are multiple clamping mechanisms 4, which are symmetrically arranged on the surfaces of the sliding plate 7 and the lifting plate 3, respectively. A group of two clamping mechanisms 4 clamps the upper and lower parts of the sheet respectively.

[0026] The pull ropes 6 are all provided with dynamometers, and the dynamometers are designed to detect the final force when the sheet is broken.

[0027] The driving shaft 5 is driven by a stepper motor with a transmission, and a low rotation speed provides greater torque and greater pulling force.

[0028] The limiting frame 42 is a rectangular hollow frame with a notch on one side. Through the setting of the limiting frame 42, the sheet material can be simply positioned after being inserted into it.

[0029] The above description is only a preferred embodiment of the present invention and does not limit the present invention in any form. Although the present invention has been disclosed as a preferred embodiment as above, it is not used to limit the present invention. Any technical personnel in this field can make some changes or modify the technical contents disclosed above into equivalent embodiments without departing from the scope of the technical solution of the present invention. However, any brief modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the present invention without departing from the content of the technical solution of the present invention are still within the scope of the technical solution of the present invention.

Claims

1. A plastic sheet tensile testing device, comprising a frame (1), a lifting plate (3) driven to rise and fall by a hydraulic mechanism in an inner cavity of the frame (1), and a guide rail (2) fixed to a side of the frame (1), characterized in that: The inner cavity of the guide track (2) is slidably connected to a sliding plate (7), and the sides of the sliding plate (7) and the lifting plate (3) are both provided with a clamping mechanism (4) for clamping the sheet; The clamping mechanism (4) comprises a double-rod clamping cylinder (41) respectively fixed on the sides of the sliding plate (7) and the lifting plate (3); the end of the piston rod of the double-rod clamping cylinder (41) is fixedly connected to a side clamping plate (43); the side of the side clamping plate (43) close to the sheet is fixedly connected to an inner plate (44); the side of the inner plate (44) is fixedly connected to a plurality of electric heating blocks (45); one side of the double-rod clamping cylinder (41) is fixedly connected to a limiting frame (42) for limiting the position of the sheet; The top of the frame (1) is rotatably connected to a driving shaft (5) driven by a motor, the surface of the driving shaft (5) is fixedly connected to a pull rope (6), and the bottom end of the pull rope (6) is fixedly connected to the top of the sliding plate (7).

2. A plastic sheet tensile testing device according to claim 1, characterized in that: The electric heating blocks (45) on the inner panels (44) on both sides are arranged alternately left and right.

3. A plastic sheet tensile testing device according to claim 1, characterized in that: A plurality of clamping mechanisms (4) are provided, and are symmetrically arranged one above the other on the surface of the sliding plate (7) and the lifting plate (3), respectively. A group of two clamping mechanisms (4) clamp the upper and lower parts of the sheet respectively.

4. A plastic sheet tensile testing device according to claim 1, characterized in that: The pull ropes (6) are all provided with dynamometers.

5. The plastic sheet tensile testing device according to claim 1, characterized in that: The driving shaft (5) is driven by a stepping motor with a transmission.

6. A plastic sheet tensile testing device according to claim 1, characterized in that: The limiting frame (42) is a rectangular hollow frame with a notch on one side.

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