Tensile strength detection equipment for rubber and plastic sealing element

Abstract

The invention relates to the technical field of rubber and plastic part detection, in particular to rubber and plastic sealing part tensile strength detection equipment which comprises a processing table, a base is mounted on the processing table, a fixing ring is mounted on the base, an annular rubber air bag sleeves the fixing ring, and an annular upper baffle is mounted at the upper end of the fixing ring through a clamping assembly. And a plurality of air inlet holes communicating with the interior of the rubber air bag are formed in the circumference of the fixing ring at equal intervals, an air collection cylinder is vertically and fixedly installed in the middle of the base, and an inflation assembly is arranged in the air collection cylinder. In the detection process of the sealing element, the rubber air bag is sleeved with the sealing element, gas is continuously inflated into the rubber air bag through the inflation assembly, the rubber air bag expands towards the periphery, in the expansion process, the acting force of the rubber air bag on the inner wall of an annular hole of the sealing element is uniform, the sealing element can be evenly expanded, the stress concentration phenomenon can be avoided, and the detection accuracy is improved. And the accuracy of tensile strength detection is ensured.

Description

Technical Field

[0001] The present invention relates to the technical field of rubber and plastic parts detection, and in particular to a tensile strength detection device for rubber and plastic sealing parts. Background Art

[0002] When assembling rubber seals with parts, an annular mounting groove for the rubber seals needs to be opened on the parts. Since the diameter of the annular mounting groove is larger than the diameter of the rubber seal, the rubber seal will be stretched to a certain extent after being installed in the sealing groove. If the tensile strength and contraction force of the rubber seal are unqualified, the sealing ring will not be able to effectively fit with the annular mounting groove when stretched, and thus will not be able to achieve a sealing effect. Therefore, the tensile strength of the rubber seal needs to be tested after production.

[0003] Currently, when performing tensile strength testing on rubber and plastic seals, the method is mainly to pull the rubber and plastic seals in multiple directions using multiple hooks to make the rubber and plastic seals in a stretched state, and then perform tensile strength testing on the rubber and plastic seals. However, the hook pulling method easily causes stress concentration on the surface of the rubber and plastic seals, resulting in an inability to effectively test the tensile strength of the rubber and plastic seals. Summary of the Invention

[0004] The purpose of the present invention is to solve the following shortcomings in the prior art. At present, when the tensile strength of rubber and plastic seals is tested, the rubber and plastic seals are mainly pulled in multiple directions by multiple hooks, so that the rubber and plastic seals are in a stretched state, and then the tensile strength of the rubber and plastic seals is tested. However, the hook pulling method easily produces stress concentration on the surface of the rubber and plastic seals, resulting in the inability to test the tensile strength of the rubber and plastic seals well. A tensile strength testing device for rubber and plastic seals is proposed.

[0005] In order to achieve the above object, the present invention adopts the following technical solutions: A tensile strength testing device for rubber and plastic seals, comprising a processing table, a base fixedly mounted in the middle of the processing table, a fixing ring fixedly mounted in the middle of the base, an annular rubber airbag sleeved on the fixing ring, the inner ring of the rubber airbag fixedly connected to the side surface of the fixing ring; An annular upper baffle is installed on the upper end of the fixed ring through a clamping assembly. The upper and lower sides of the rubber airbag are in contact with the upper baffle and the base respectively. A plurality of air inlet holes that are connected to the interior of the rubber airbag are equidistantly opened on the circumference of the fixed ring. An air collecting cylinder is vertically fixedly installed in the middle part of the base, and an inflation assembly for inflating the plurality of air inlet holes is provided in the air collecting cylinder.

[0006] As a preferred solution, the inflation assembly includes multiple outlet pipes equidistantly installed on the side of the gas collecting cylinder, multiple inlet pipes equidistantly installed on the side of the gas collecting cylinder, a piston vertically sealed and slidably installed in the gas collecting cylinder, and a driving component for driving the piston to move back and forth up and down. The multiple outlet pipes and the multiple inlet pipes are all connected to the interior of the gas collecting cylinder, and the ends of the multiple outlet pipes away from the gas collecting cylinder are respectively connected to multiple inlet holes.

[0007] As a preferred solution, the driving component includes two mounting seats symmetrically fixedly installed on the sides of the gas collecting cylinder, two reciprocating cylinders respectively fixedly installed on the two mounting seats, a push rod vertically fixedly installed on the upper surface of the piston and a connecting rod fixedly installed on the upper end of the push rod, and the output ends of the two reciprocating cylinders are fixedly connected to the connecting rod.

[0008] As a preferred solution, the sliding sleeve on the push rod is provided with a mounting bracket, and the mounting bracket is fixedly installed on the upper end of the gas collecting cylinder. A plurality of the gas outlet pipes are installed with a first one-way valve that allows gas to enter the rubber airbag from the gas collecting cylinder, and a plurality of the gas inlet pipes are installed with a second one-way valve that allows gas to enter the gas collecting cylinder from the outside.

[0009] As a preferred solution, a pressure relief pipe is installed on the side of the gas collecting cylinder, and the pressure relief pipe is connected to the inside of the gas collecting cylinder. A socket is opened on the upper surface of the pressure relief pipe, and a sealing plate is inserted into the socket. A strip rod is fixedly installed on the upper end of the sealing plate.

[0010] As a preferred solution, the snap-on assembly includes two vertical rods both vertically fixed on the base, two connecting blocks both fixed on the inner side of the upper baffle and a locking component for locking the vertical rods and the connecting blocks together, and movable holes are opened through the upper and lower surfaces of the connecting blocks, and the vertical rods are vertically slidably inserted into the movable holes.

[0011] As a preferred solution, a positioning hole is provided on the side of the vertical rod, and a limiting hole connected to the movable hole is provided on the side of the connecting block. The locking component includes two spring rods horizontally fixedly installed on the connecting block, a pull rod fixedly installed on one end of the two spring rods, and a limiting rod horizontally fixedly installed on the pull rod, and one end of the limiting rod passes through the limiting hole and is inserted into the positioning hole.

[0012] As a preferred solution, a support block is fixedly installed on the processing table, a rectangular hole is opened on the side of the support block, a rectangular rod is horizontally slidably installed in the rectangular hole, and an arc block is fixedly installed on one end of the rectangular rod.

[0013] As a preferred solution, a scale is fixedly mounted horizontally on the side of the support block, and an indicator rod is fixedly mounted on one end of the rectangular rod away from the arc block, with one end of the indicator rod pointing to the scale.

[0014] Compared with the prior art, the present invention has the following beneficial effects: 1. During the testing process, the seal is placed on the rubber airbag, and then gas is continuously injected into the rubber airbag through the inflation assembly. The rubber airbag can only expand in all directions under the limitation of the fixed ring, the upper baffle and the base. During the expansion process, the rubber airbag exerts a relatively uniform force on the inner wall of the seal ring hole, so that the seal can be evenly expanded, which can avoid stress concentration and ensure the accuracy of the tensile strength test.

[0015] 2. When the seal is placed on the rubber airbag, move the rectangular rod so that the arc block contacts the side of the seal. When the seal is evenly stretched, it will drive the arc block to move toward the support block. Then, the change in the diameter of the seal after stretching can be determined by the scale and indicator rod, thereby determining the maximum diameter of the seal at the maximum stretching degree. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 This is a schematic diagram of the three-dimensional structure of a tensile strength testing device for rubber and plastic seals proposed by the present invention; Figure 2 This is a schematic diagram of a partial three-dimensional exploded structure of a tensile strength testing device for rubber and plastic seals proposed by the present invention; Figure 3 for Figure 2 A in the middle is an enlarged structural diagram; Figure 4 It is a schematic diagram of a three-dimensional partial cross-section structure of the base, fixing ring, upper baffle and rubber airbag; Figure 5 for Figure 4 The enlarged structural diagram at B in the middle; Figure 6 It is a schematic diagram of a three-dimensional partial cross-section structure of the base, rubber airbag, fixing ring and inflation component; Figure 7 for Figure 6 The enlarged structural diagram at C in the middle; Figure 8 It is a schematic diagram of the three-dimensional partial cross-section structure of the fixing ring, gas collecting cylinder and inflation component.

[0017] In the figure: 1 processing table, 2 base, 3 fixing ring, 4 rubber airbag, 5 upper baffle, 6 air inlet hole, 7 air collecting cylinder, 8 outlet pipe, 9 air inlet pipe, 10 piston, 11 mounting seat, 12 reciprocating cylinder, 13 push rod, 14 connecting rod, 15 mounting frame, 16 pressure relief pipe, 17 sealing plate, 18 strip rod, 19 vertical rod, 20 connecting block, 21 spring rod, 22 pull rod, 23 limit rod, 24 positioning hole, 25 moving hole, 26 support block, 27 rectangular rod, 28 arc block, 29 scale, 30 indicator rod. DETAILED DESCRIPTION

[0018] The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0019] Reference Figures 1-8 A tensile strength testing device for rubber and plastic seals includes a processing table 1, a base 2 is fixedly installed in the middle part of the processing table 1, a fixing ring 3 is fixedly installed in the middle part of the base 2, an annular rubber airbag 4 is sleeved on the fixing ring 3, the inner ring of the rubber airbag 4 is fixedly connected to the side of the fixing ring 3, an annular upper baffle 5 is installed on the upper end of the fixing ring 3 through a clamping assembly, the upper and lower sides of the rubber airbag 4 are in contact with the upper baffle 5 and the base 2 respectively, a plurality of air inlet holes 6 are equidistantly opened on the circumference of the fixing ring 3, all of which are connected to the inside of the rubber airbag 4, a gas collecting cylinder 7 is vertically fixedly installed in the middle part of the base 2, and an inflation component for inflating the plurality of air inlet holes 6 is provided in the gas collecting cylinder 7.

[0020] The upper baffle 5 is fixedly installed on the fixing ring 3 through a clamping assembly. An I-shaped wheel can be formed between the upper baffle 5, the fixing ring 3 and the base 2. The rubber airbag 4 is fixedly sleeved on the fixing ring 3. The upper baffle 5 contacts the upper surface of the rubber airbag 4, and the base 2 contacts the lower surface of the rubber airbag 4. When gas is filled into the rubber airbag 4, the rubber airbag 4 will expand and deform.

[0021] When testing the tensile strength of the seal, first remove the upper baffle 5 from the fixing ring 3, then put the seal to be tested on the rubber airbag 4, fix the upper baffle 5 on the fixing ring 3, and the seal is between the upper baffle 5 and the base 2, and then continuously fill the air inlet 6 with gas through the inflation component. The gas enters the rubber airbag 4 through the air inlet 6, and the rubber airbag 4 expands. During the expansion of the rubber airbag 4, the upper baffle 5, the fixing ring 3 and the base 2 can all restrict the rubber airbag 4, so that the rubber airbag 4 can only expand in all directions. During the expansion process, the outer side of the rubber airbag 4 contacts the inner wall of the seal ring hole and stretches the seal. The force of the rubber airbag 4 on the inner wall of the seal ring hole is relatively uniform, so that the seal can be evenly stretched, which can avoid stress concentration and ensure the accuracy of the tensile strength test.

[0022] The inflation assembly includes multiple outlet pipes 8 equidistantly installed on the side of the gas collecting cylinder 7, multiple inlet pipes 9 equidistantly installed on the side of the gas collecting cylinder 7, a piston 10 vertically and sealingly slidably installed in the gas collecting cylinder 7, and a driving component for driving the piston 10 to move back and forth up and down. The multiple outlet pipes 8 and the multiple inlet pipes 9 are all connected to the interior of the gas collecting cylinder 7, and the ends of the multiple outlet pipes 8 away from the gas collecting cylinder 7 are respectively connected to multiple inlet holes 6, and the piston 10 is sealed and slidably installed in the gas collecting cylinder 7.

[0023] The driving components include two mounting seats 11 symmetrically fixedly mounted on the sides of the gas collecting cylinder 7, two reciprocating cylinders 12 respectively fixedly mounted on the two mounting seats 11, a push rod 13 vertically fixedly mounted on the upper surface of the piston 10 and a connecting rod 14 fixedly mounted on the upper end of the push rod 13. The output ends of the two reciprocating cylinders 12 are fixedly connected to the connecting rod 14. A mounting bracket 15 is provided on the sliding sleeve of the push rod 13. The mounting bracket 15 is fixedly mounted on the upper end of the gas collecting cylinder 7. A first one-way valve allowing gas to enter the rubber airbag 4 from the gas collecting cylinder 7 is installed in multiple outlet pipes 8. A second one-way valve allowing gas to enter the gas collecting cylinder 7 from the outside is installed in multiple inlet pipes 9. The push rod 13 is vertically slidably mounted in the gas collecting cylinder 7 through the mounting bracket 15. With the support of the mounting bracket 15, the push rod 13 can be guaranteed to move up and down stably.

[0024] When the piston 10 continuously moves up and down in the gas collecting cylinder 7, air can be continuously filled into the rubber airbag 4, thereby making the rubber airbag 4 continuously expand.

[0025] The air in the rubber airbag 4 will be discharged after the air in the rubber airbag 4 is restored to its original state, and then the sealing plate 17 will be inserted into the socket.

[0026] The snap-on assembly includes two vertical rods 19 both vertically fixedly mounted on the base 2, two connecting blocks 20 both fixedly mounted on the inner side of the upper baffle 5, and a locking component for locking the vertical rods 19 and the connecting blocks 20 together. Moving holes 25 are provided through the upper and lower surfaces of the connecting blocks 20, and the vertical rods 19 are vertically slidably inserted into the moving holes 25.

[0027] The two connecting blocks 20 are fixedly mounted on the inner wall of the ring hole of the upper baffle 5. When the upper baffle 5 is fixed to the upper end of the fixed ring 3, the movable holes 25 opened in the two connecting blocks 20 are aligned with the upper ends of the two vertical rods 19 respectively, and then the connecting blocks 20 are sleeved on the two vertical rods 19. Under the action of the vertical rods 19 and the connecting blocks 20, the upper baffle 5 can be driven to move up and down on the upper end of the fixed ring 3, and then the upper baffle 5 is driven to approach the fixed ring 3 so that the upper baffle 5 contacts the upper end of the fixed ring 3.

[0028] A positioning hole 24 is provided on the side of the vertical rod 19, and a limiting hole connected to the movable hole 25 is provided on the side of the connecting block 20. The locking component includes two spring rods 21 horizontally fixedly mounted on the connecting block 20, a pull rod 22 fixedly mounted on one end of the two spring rods 21, and a limiting rod 23 horizontally fixedly mounted on the pull rod 22. One end of the limiting rod 23 passes through the limiting hole and is inserted into the positioning hole 24.

[0029] When the upper baffle 5 contacts the upper end of the fixing ring 3, the positioning hole 24 opened on the vertical rod 19 is just aligned with the limiting hole opened on the side of the connecting block 20. Under the action of the elastic force of the spring rod 21, the pull rod 22 tends to move toward the connecting block 20. When the connecting block 20 is put on the vertical rod 19, the pull rod 22 is pulled to drive the limiting rod 23 to move in the direction of the pull rod 22, so that one end of the limiting rod 23 moves out of the moving hole 25. When the upper baffle 5 is installed on the fixing ring 3, the pull rod 22 is released. Under the action of the elastic force of the spring rod 21, one end of the limiting rod 23 will be inserted into the positioning hole 24 opened in the vertical rod 19. Under the action of the limiting rod 23, the connecting block 20 is locked on the vertical rod 19, thereby locking the upper baffle 5 to the upper end of the fixing ring 3.

[0030] A support block 26 is fixedly installed on the processing table 1. A rectangular hole is opened on the side of the support block 26. A rectangular rod 27 is horizontally slidably installed in the rectangular hole. An arc block 28 is fixedly installed at one end of the rectangular rod 27. A scale 29 is horizontally fixedly installed on the side of the support block 26. An indicator rod 30 is fixedly installed on the end of the rectangular rod 27 away from the arc block 28, and one end of the indicator rod 30 points to the scale 29.

[0031] The rectangular rod 27 is mounted on the support block 26 for horizontal sliding. The end of the indicator rod 30 mounted on one end of the rectangular rod 27 points to the scale 29. When testing the tensile strength of the seal, the seal is first placed on the rubber airbag 4, and then gas is filled into the rubber airbag 4 to expand the rubber airbag 4 toward the seal. When the outer side of the rubber airbag 4 just contacts the inner wall of the ring hole of the seal, the rectangular rod 27 is moved to drive the arc block 28 to contact the outer wall of the seal, and then the time when the indicator rod 30 points to the scale 29 is recorded. Scale, and then continue to inflate the rubber airbag 4 to expand the seal through the rubber airbag 4 to perform tensile strength testing. During the expansion process, the seal will drive the arc block 28 and the rectangular rod 27 to move toward the support block 26. At this time, the scale of the scale 29 pointed by the indicator rod 30 will also increase accordingly until the seal is stretched to the maximum size and breaks. At this time, it is recorded that when the seal is stretched to the maximum diameter, the scale of the scale 29 pointed by the indicator rod 30 is pointed by the indicator rod 30, so as to judge the maximum diameter of the seal under the maximum stretching degree.

[0032] In the present invention, when testing the tensile strength of the seal, the upper baffle 5 is first removed from the fixing ring 3, and then the seal to be tested is put on the rubber airbag 4, and the upper baffle 5 is fixed on the fixing ring 3, and the seal is between the upper baffle 5 and the base 2, and then gas is continuously filled into the air inlet 6 through the inflation component. The gas enters the rubber airbag 4 through the air inlet 6, and the rubber airbag 4 expands. During the expansion of the rubber airbag 4, the upper baffle 5, the fixing ring 3 and the base 2 can all restrict the rubber airbag 4, so that the rubber airbag 4 can only expand in all directions. During the expansion process, the outer side of the rubber airbag 4 contacts the inner wall of the seal ring hole and stretches the seal. The force of the rubber airbag 4 on the inner wall of the seal ring hole is relatively uniform, so that the seal can be evenly stretched, which can avoid stress concentration and ensure the accuracy of the tensile strength test.

[0033] The above description is only a preferred specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any technician familiar with the technical field, within the technical scope disclosed by the present invention, who makes equivalent replacements or changes based on the technical solution and inventive concept of the present invention, should be covered by the scope of protection of the present invention.

Claims

1. A tensile strength testing device for rubber and plastic seals, comprising a processing table (1), characterized in that: A base (2) is fixedly mounted in the middle of the processing table (1), a fixing ring (3) is fixedly mounted in the middle of the base (2), an annular rubber airbag (4) is sleeved on the fixing ring (3), and the inner ring of the rubber airbag (4) is fixedly connected to the side of the fixing ring (3); An annular upper baffle (5) is mounted on the upper end of the fixing ring (3) via a snap-fit ​​assembly. The upper and lower sides of the rubber airbag (4) are in contact with the upper baffle (5) and the base (2) respectively. A plurality of air inlet holes (6) are equidistantly arranged on the circumference of the fixing ring (3) and are all connected to the interior of the rubber airbag (4). A gas collecting cylinder (7) is vertically fixedly mounted on the middle portion of the base (2). An inflation assembly for inflating the plurality of air inlet holes (6) is provided in the gas collecting cylinder (7).

2. The tensile strength testing device for rubber and plastic seals according to claim 1, characterized in that: The inflation assembly comprises a plurality of air outlet pipes (8) equidistantly mounted on the side of the air collecting cylinder (7), a plurality of air inlet pipes (9) equidistantly mounted on the side of the air collecting cylinder (7), a piston (10) vertically sealed and slidably mounted in the air collecting cylinder (7), and a driving component for driving the piston (10) to move up and down. The plurality of air outlet pipes (8) and the plurality of air inlet pipes (9) are all connected to the interior of the air collecting cylinder (7), and the ends of the plurality of air outlet pipes (8) away from the air collecting cylinder (7) are respectively connected to the plurality of air inlet holes (6).

3. The tensile strength testing device for rubber and plastic seals according to claim 2, characterized in that: The driving component comprises two mounting seats (11) symmetrically fixedly mounted on the side of the gas collecting cylinder (7), two reciprocating cylinders (12) respectively fixedly mounted on the two mounting seats (11), a push rod (13) vertically fixedly mounted on the upper surface of the piston (10), and a connecting rod (14) fixedly mounted on the upper end of the push rod (13), and the output ends of the two reciprocating cylinders (12) are fixedly connected to the connecting rod (14).

4. The tensile strength testing device for rubber and plastic seals according to claim 3, characterized in that: The push rod (13) is provided with a sliding sleeve with a mounting frame (15), and the mounting frame (15) is fixedly mounted on the upper end of the gas collecting cylinder (7). A first one-way valve is installed in each of the plurality of gas outlet pipes (8) to allow gas to enter the rubber airbag (4) from the gas collecting cylinder (7), and a second one-way valve is installed in each of the plurality of gas inlet pipes (9) to allow gas to enter the gas collecting cylinder (7) from the outside.

5. The tensile strength testing device for rubber and plastic seals according to claim 2, characterized in that: A pressure relief pipe (16) is installed on the side of the gas collecting cylinder (7), and the pressure relief pipe (16) is connected to the inside of the gas collecting cylinder (7). A plug hole is opened on the upper surface of the pressure relief pipe (16), and a sealing plate (17) is inserted into the plug hole. A strip rod (18) is fixedly installed on the upper end of the sealing plate (17).

6. The tensile strength testing device for rubber and plastic seals according to claim 1, characterized in that: The clamping assembly comprises two vertical rods (19) both fixedly mounted on the base (2), two connecting blocks (20) both fixedly mounted on the inner side of the upper baffle (5), and a locking component for locking the vertical rods (19) and the connecting blocks (20) together, wherein movable holes (25) are formed through the upper and lower surfaces of the connecting blocks (20), and the vertical rods (19) are vertically slidably inserted into the movable holes (25).

7. The tensile strength testing device for rubber and plastic seals according to claim 6, characterized in that: A positioning hole (24) is provided on the side of the vertical rod (19), and a limiting hole connected to the moving hole (25) is provided on the side of the connecting block (20). The locking component includes two spring rods (21) fixedly mounted horizontally on the connecting block (20), a pull rod (22) fixedly mounted on one end of the two spring rods (21), and a limiting rod (23) fixedly mounted horizontally on the pull rod (22). One end of the limiting rod (23) passes through the limiting hole and is inserted into the positioning hole (24).

8. The tensile strength testing device for rubber and plastic seals according to claim 1, characterized in that: A support block (26) is fixedly mounted on the processing table (1), a rectangular hole is opened on the side of the support block (26), a rectangular rod (27) is horizontally slidably mounted in the rectangular hole, and an arc block (28) is fixedly mounted on one end of the rectangular rod (27).

9. The tensile strength testing device for rubber and plastic seals according to claim 8, characterized in that: A scale (29) is fixedly mounted horizontally on the side of the support block (26); an indicator rod (30) is fixedly mounted on one end of the rectangular rod (27) away from the arc block (28); one end of the indicator rod (30) points to the scale (29).

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