Paraffin tensile strength testing device

Abstract

The utility model relates to a paraffin tensile strength testing device which comprises a connecting mechanism, a fixing mechanism and a clamp component, the connecting mechanism comprises a bolt and a clamp, the fixing mechanism comprises a bolt and a cover plate, the clamp component comprises a mold, and paraffin is clamped through a pair of devices; the clamp is in a U shape, a bolt penetrates through a bottom plate of the clamp, the bolt abuts against the side edge of the mold, the bolt serves as a connecting end of the testing machine, the clamp is clamped to the side face of the mold through two side plates of the clamp, the bolt penetrates through the two side plates of the clamp and the mold, and the clamp and the mold are fixed through the bolt; the cover plates are arranged on the two sides of the mold, the bolts penetrate through the cover plates and the mold, and the cover plates and the mold are fixed through the bolts. A groove is formed in the mold, and paraffin is clamped in the groove. Compared with the prior art, the real tensile strength of paraffin can be effectively detected, and each module is simple and convenient to process and manufacture and can be detached and replaced.

Description

Technical Field

[0001] The utility model belongs to the technical field of strength testing, and relates to a paraffin tensile strength testing device. Background Art

[0002] Paraffin is a high molecular compound with a low coefficient of friction, and tensile strength is one of the important criteria for measuring its quality and performance. In order to obtain specific parameters of the mechanical properties of paraffin, it is necessary to test the tensile strength of paraffin, and a tensile strength testing device is required during the testing process. However, there are the following difficulties in tensile strength testing: the strength of paraffin is relatively low, and stress concentration in the clamping area may cause premature failure of the paraffin specimen, making it impossible to measure the true tensile strength of paraffin.

[0003] Existing tensile strength testing devices, such as the patent CN214066726U, disclose a fixture for concrete tensile testing, including a first fixture and a second fixture. By setting notches and screws on the inner side of the movable clamping plate, the slippage problem between the specimen and the fixture is largely solved; the suspender that can be moved and rotated can adjust the load action line to be as aligned with the specimen axis as possible, thereby reducing test errors. This patent fixes the two-sided movable clamping plates through bolts, clamps the concrete specimen through the grooves on the two-sided movable clamping plates, and connects the movable clamping plate and the concrete specimen through screw threads of the screws, and transmits the load through the bolts and screws. The same method cannot be applied to paraffin specimens with low strength, and stress concentration is likely to occur at the paraffin clamping part, resulting in premature failure and unable to measure the tensile strength of paraffin.

[0004] The patent CN115615826A discloses a tensile-shear coupling testing device and a testing method for test pieces. The clamping device is used to clamp the upper and lower ends of the test piece. The upper end of the clamping device is connected to the vertical actuator through the upper fixture, and the vertical actuator applies tensile-shear loads to the test piece in the vertical direction. The clamping device is connected to the horizontal actuator through the lower fixture, and the horizontal actuator applies tensile-shear loads to the test piece in the horizontal direction. The lower end of the clamping device is installed on the bottom fixing mechanism through the lower fixture, and fixing mechanisms are symmetrically installed on the left and right sides of the upper fixture. However, this patent passes the pin through the holes and fixes the test piece between the trapezoidal clamping blocks to transmit the tensile stress, and transmits the load through the pins, which is prone to stress concentration and premature failure, and the tensile strength of paraffin cannot be detected. Summary of the Utility Model

[0005] The purpose of the utility model is to provide a paraffin tensile strength testing device to overcome at least one defect existing in the above-mentioned prior art. The utility model can effectively detect the true tensile strength of paraffin, and each module is simple and convenient to process and manufacture, and can be disassembled and replaced.

[0006] The purpose of the utility model can be achieved by the following technical solutions:

[0007] One of the technical solutions of the present utility model is to provide a paraffin tensile strength testing device, which includes a connection mechanism, a fixing mechanism and a fixture member. The connection mechanism includes a bolt and a fixture. The fixing mechanism includes a bolt and a cover plate. The fixture member includes a mold, and a pair of devices are used to clamp paraffin.

[0008] The fixture is U-shaped. The bottom plate of the fixture passes through the bolt, and the bolt abuts against the side of the mold. The bolt serves as the connection end of the testing machine. The fixture clamps the side of the mold through the two side plates of the fixture. The bolt passes through the two side plates of the fixture and the mold, and the fixture and the mold are fixed by the bolt. The connection mechanism is used for the fixed connection between the mold and the testing machine.

[0009] Cover plates are arranged on both sides of the mold. The bolt passes through the cover plate and the mold, and the cover plate and the mold are fixed by the bolt. The fixing mechanism is used to reinforce the connection of the poured paraffin.

[0010] A groove is formed on the mold, and the groove clamps the paraffin. The fixture member is used to clamp the poured paraffin.

[0011] Further, a first bolt hole is formed on the bottom plate of the fixture, and a first bolt is inserted into the first bolt hole. The first bolt abuts against the side of the mold. The first bolt serves as the connection end of the testing machine.

[0012] Further, a first nut is threadedly connected and locked on the other side of the first bolt where the fixture clamps the mold.

[0013] Further, fixture second bolt holes are formed on the two side plates of the fixture, and a second bolt is inserted into the fixture second bolt holes;

[0014] Mold second bolt holes are formed on the mold, and the second bolt passes through the mold second bolt holes;

[0015] The fixture and the mold are fixed by the second bolt.

[0016] Further, a second nut is threadedly connected and locked on the other side of the second bolt outside the fixture where the bolt head is located.

[0017] Further, the shape of the mold includes circular, oval or rectangular;

[0018] A groove is formed on the mold on the other side of the mold second bolt hole. The shape of the groove is semi-dumbbell-shaped, and the shape of the paraffin clamped by the groove is dumbbell-shaped.

[0019] Further, the shape of the cover plate includes circular, oval or rectangular;

[0020] Boltholes are provided at the corners of the cover plate. Bolts are inserted through these boltholes to fix the cover plate and the mold.

[0021] Further, the cover plate includes a first cover plate and a second cover plate, and the bolts include a third bolt, a fourth bolt, a fifth bolt, and a sixth bolt.

[0022] Further, a first cover plate third bolthole, a first cover plate fourth bolthole, a first cover plate fifth bolthole, and a first cover plate sixth bolthole are provided at the corners of the first cover plate, and a second cover plate third bolthole, a second cover plate fourth bolthole, a second cover plate fifth bolthole, and a second cover plate sixth bolthole are provided at the corners of the second cover plate.

[0023] The third bolt is inserted through the first cover plate third bolthole and the second cover plate third bolthole, the fourth bolt is inserted through the first cover plate fourth bolthole and the second cover plate fourth bolthole, the fifth bolt is inserted through the first cover plate fifth bolthole and the second cover plate fifth bolthole, and the sixth bolt is inserted through the first cover plate sixth bolthole and the second cover plate sixth bolthole.

[0024] Mold third boltholes, mold fourth boltholes, mold fifth boltholes, and mold sixth boltholes are provided around the groove on the mold.

[0025] The third bolt passes through the mold third bolthole, the fourth bolt passes through the mold fourth bolthole, the fifth bolt passes through the mold fifth bolthole, and the sixth bolt passes through the mold sixth bolthole.

[0026] The first cover plate, the mold, and the second cover plate are fixed by the third bolt, the fourth bolt, the fifth bolt, and the sixth bolt.

[0027] As a preferred technical solution, a nut is provided on the other side of the bolt head of the outer-bolt of the clamp for threaded connection and locking.

[0028] Further, a third nut is provided on the other side of the bolt head of the third bolt outside the cover plate for threaded connection and locking, a fourth nut is provided on the other side of the bolt head of the fourth bolt outside the cover plate for threaded connection and locking, a fifth nut is provided on the other side of the bolt head of the fifth bolt outside the cover plate for threaded connection and locking, and a sixth nut is provided on the other side of the bolt head of the sixth bolt outside the cover plate for threaded connection and locking.

[0029] As a preferred technical solution, the areas of the first cover plate and the second cover plate can both be changed, mainly to adapt to the area of the paraffin clamping end.

[0030] As a preferred technical solution, the lengths of the second bolt, the third bolt, the fourth bolt, the fifth bolt and the sixth bolt can all be changed, mainly to adapt to the thickness of the paraffin clamping end.

[0031] As a preferred technical solution, the material of the device includes metals such as stainless steel or copper.

[0032] One of the technical solutions of the present utility model is to provide a method for testing the tensile strength of paraffin. This method uses the described device to test the tensile strength of paraffin, and includes the following steps:

[0033] Clamp the pair of molds to the paraffin completed by casting through the grooves, fix the cover plate to both sides of the grooves of the molds through bolts, lock them through nuts, fix the U-shaped fixture to both sides of the molds through bolts, lock them through nuts, abut the bolts against the sides of the molds, lock them through nuts, and the bolts serve as the connection ends of the testing machine. The testing machine applies tensile force to the bolts, and the tensile force is transmitted to the molds through the fixture to test the tensile strength of the paraffin. The test results are the average values of multiple tests.

[0034] As a preferred technical solution, clamp the pair of molds to the paraffin completed by casting through the grooves, fix the first cover plate and the second cover plate to both sides of the grooves of the molds through the third bolt, the fourth bolt, the fifth bolt and the sixth bolt, lock them through the third nut, the fourth nut, the fifth nut and the sixth nut, fix the U-shaped fixture to both sides of the molds through the second bolt, lock them through the second nut, abut the first bolt against the sides of the molds, lock them through the first nut, and the first bolt serves as the connection end of the testing machine. The testing machine applies tensile force to the first bolt, and the tensile force is transmitted to the molds through the fixture to test the tensile strength of the paraffin. The test results are the average values of multiple tests.

[0035] Compared with the prior art, the present utility model has the following beneficial effects:

[0036] (1) The present utility model includes a connection mechanism, a fixing mechanism and a fixture member. Each module includes bolts, nuts or plate members. After the paraffin is installed into the grooves of the plate members, each module cleverly realizes the overall stable and reliable connection of the device through the combination relationship between the bolts and the plate members;

[0037] (2) Each module of the present utility model is simple and convenient to process and manufacture, and can be disassembled and replaced. The lengths of the bolts of each module can be replaced according to the dimensions such as the thickness and area of the paraffin clamping end, and plate members with different areas and slot sizes can be set and processed;

[0038] (3) The existing tensile testing device uses bolts to fix the tensile test specimen. During the tensile test, stress concentration will occur at the bolt hole positions due to the sharp change in shape. For paraffin specimens with relatively low tensile strength, they will be prematurely damaged due to stress concentration and the tensile strength cannot be detected. The present utility model clamps and casts the paraffin completed through a mold, and fixes the paraffin through the two side covers. The shape of the mold groove is semi-dumbbell-shaped, and the shape of the paraffin clamped by the groove is dumbbell-shaped. During the tensile test, the shape of the paraffin clamping area does not change significantly. In view of the soft strength characteristic of the paraffin material, the true tensile strength of the paraffin can be effectively detected, and the generation of stress concentration in the clamping area can be effectively overcome. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] Figure 1 It is a schematic three-dimensional assembly structure diagram of the paraffin tensile strength testing device in the embodiment of the present utility model;

[0040] Figure 2 It is a schematic exploded three-dimensional structure diagram of the connecting mechanism in the embodiment of the present utility model;

[0041] Figure 3 It is a schematic exploded three-dimensional structure diagram of the fixture member in the embodiment of the present utility model;

[0042] Figure 4 It is a schematic exploded three-dimensional structure diagram of the cover plate in the fixing mechanism in the embodiment of the present utility model;

[0043] Figure 5 It is a schematic exploded three-dimensional structure diagram of the bolt and nut in the fixing mechanism in the embodiment of the present utility model.

[0044] Description of the marks in the figure:

[0045] 1 - First bolt, 2 - First nut, 3 - Fixture, 4 - Second bolt, 5 - Second nut;

[0046] 6 - Mold;

[0047] 7 - First cover plate, 8 - Second cover plate, 9 - Third bolt, 10 - Fourth bolt, 11 - Fifth bolt, 12 - Sixth bolt, 13 - Third nut, 14 - Fourth nut, 15 - Fifth nut, 16 - Sixth nut;

[0048] 17 - First bolt hole, 18 - Second bolt hole of the fixture;

[0049] 19 - Second bolt hole of the mold, 20 - Third bolt hole of the mold, 21 - Fourth bolt hole of the mold, 22 - Fifth bolt hole of the mold, 23 - Sixth bolt hole of the mold, 24 - Groove;

[0050] 25—The third bolt hole of the first cover plate, 26—The fourth bolt hole of the first cover plate, 27—The fifth bolt hole of the first cover plate, 28—The sixth bolt hole of the first cover plate, 29—The third bolt hole of the second cover plate, 30—The fourth bolt hole of the second cover plate, 31—The fifth bolt hole of the second cover plate, 32—The sixth bolt hole of the second cover plate. Detailed implementation manners

[0051] The present utility model will be described in detail below in conjunction with specific embodiments. These embodiments are implemented on the premise of the technical solution of the present utility model, and detailed implementation manners and specific operation processes are given. However, the protection scope of the present utility model is not limited to the following embodiments.

[0052] In the description of the present utility model, it should be noted that the orientation or positional relationship indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present utility model. In addition, the terms "first", "second", "third", etc. are used to describe common objects, and only represent different instances referring to the same object, rather than implying that the objects described in this way must be in a given order, whether in terms of time, space, sorting, or any other way.

[0053] In the description of the present utility model, it should be noted that unless otherwise clearly specified and limited, the terms "installation", "connection", and "connection" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific situations.

[0054] Embodiment:

[0055] A paraffin tensile strength testing device, as Figure 1 shown, includes a connection mechanism, a fixing mechanism, and a fixture member. The connection mechanism includes bolts and a fixture 3. The fixing mechanism includes bolts and a cover plate. The fixture member includes a mold 6, and paraffin is clamped by a pair of devices;

[0056] The shape of the fixture 3 is selected as U-shaped. The bottom plate of the fixture 3 passes through the bolt, and the bolt abuts against the side of the mold 6. The bolt serves as the connection end of the testing machine. The fixture 3 clamps the side of the mold 6 through the two side plates of the fixture 3. The bolt passes through the two side plates of the fixture 3 and the mold 6, and the fixture 3 and the mold 6 are fixed by the bolt. The connection mechanism is used for the fixed connection between the mold 6 and the testing machine;

[0057] On both sides of the mold 6, there are cover plates. Bolts pass through the cover plates and the mold 6, and the cover plates and the mold 6 are fixed by the bolts. The fixing mechanism is used to reinforce the connection of the poured paraffin.

[0058] A groove 24 is formed on the mold 6, and the groove 24 clamps the paraffin. The fixture member is used to clamp the poured paraffin.

[0059] As Figure 2 and Figure 5 shown, a first bolt hole 17 is formed on the bottom plate of the fixture 3. A first bolt 1 is inserted into the first bolt hole 17, and the first bolt 1 abuts against the side of the mold 6. The first bolt 1 serves as the connection end of the testing machine.

[0060] On the first bolt 1, a first nut 2 is threadedly connected and locked on the other side where the fixture 3 clamps the mold 6.

[0061] Fixture second bolt holes 18 are formed on both side plates of the fixture 3. A second bolt 4 is inserted into the fixture second bolt holes 18, and the fixture 3 and the mold 6 are fixed by the second bolt 4.

[0062] On the second bolt 4, a second nut 5 is threadedly connected and locked on the other side where the bolt head of the second bolt 4 is located outside the fixture 3.

[0063] As Figure 4 and Figure 5 shown, the shape of the cover plate includes circular, oval or rectangular, and is preferably rectangular in this embodiment.

[0064] Bolt holes are formed at the corners of the cover plate. Bolts are inserted into the bolt holes, and the cover plate and the mold 6 are fixed by the bolts.

[0065] The cover plate includes a first cover plate 7 and a second cover plate 8. The bolts include a third bolt 9, a fourth bolt 10, a fifth bolt 11 and a sixth bolt 12.

[0066] On the first cover plate 7, first cover plate third bolt holes 25, first cover plate fourth bolt holes 26, first cover plate fifth bolt holes 27 and first cover plate sixth bolt holes 28 are formed at the four corners of the first cover plate 7. On the second cover plate 8, second cover plate third bolt holes 29, second cover plate fourth bolt holes 30, second cover plate fifth bolt holes 31 and second cover plate sixth bolt holes 32 are formed at the four corners of the second cover plate 8.

[0067] A third bolt 9 is inserted through a first cover plate third bolt hole 25 and a second cover plate third bolt hole 29, a fourth bolt 10 is inserted through a first cover plate fourth bolt hole 26 and a second cover plate fourth bolt hole 30, a fifth bolt 11 is inserted through a first cover plate fifth bolt hole 27 and a second cover plate fifth bolt hole 31, and a sixth bolt 12 is inserted through a first cover plate sixth bolt hole 28 and a second cover plate sixth bolt hole 32.

[0068] The first cover plate 7, the mold 6 and the second cover plate 8 are fixed by the third bolt 9, the fourth bolt 10, the fifth bolt 11 and the sixth bolt 12.

[0069] On the side of the bolt head of the bolt outside the fixture on the other side of the bolt, there is a nut threadedly connected and locked.

[0070] On the other side of the bolt head of the third bolt 9 outside the cover plate, there is a third nut 13 threadedly connected and locked, on the other side of the bolt head of the fourth bolt 10 outside the cover plate, there is a fourth nut 14 threadedly connected and locked, on the other side of the bolt head of the fifth bolt 11 outside the cover plate, there is a fifth nut 15 threadedly connected and locked, and on the other side of the bolt head of the sixth bolt 12 outside the cover plate, there is a sixth nut 16 threadedly connected and locked.

[0071] The areas of the first cover plate 7 and the second cover plate 8 can both be changed, mainly adapting to the area of the paraffin clamping end.

[0072] The lengths of the second bolt 4, the third bolt 9, the fourth bolt 10, the fifth bolt 11 and the sixth bolt 12 can all be changed, mainly adapting to the thickness of the paraffin clamping end.

[0073] Such as Figure 3 and Figure 5 As shown, a mold second bolt hole 19 is formed in the mold 6, the second bolt 4 passes through the mold second bolt hole 19, and the fixture 3 and the mold 6 are fixed by the second bolt 4.

[0074] The shape of the mold 6 includes a circle, an ellipse or a rectangle, and is preferably a circle in this embodiment.

[0075] On the other side of the mold second bolt hole 19 on the mold 6, there is a groove 24, the shape of the groove 24 is selected as a semi-dumbbell shape, and the shape of the paraffin clamped by the groove 24 is selected as a dumbbell shape.

[0076] On the mold 6 around the groove 24, there are formed a mold third bolt hole 20, a mold fourth bolt hole 21, a mold fifth bolt hole 22 and a mold sixth bolt hole 23.

[0077] The third bolt 9 passes through the third bolt hole 20 of the mold, the fourth bolt 10 passes through the fourth bolt hole 21 of the mold, the fifth bolt 11 passes through the fifth bolt hole 22 of the mold, and the sixth bolt 12 passes through the sixth bolt hole 23 of the mold.

[0078] The first cover plate 7, the mold 6, and the second cover plate 8 are fixed by the third bolt 9, the fourth bolt 10, the fifth bolt 11, and the sixth bolt 12.

[0079] The material of the device includes metals such as stainless steel or copper, and is preferably stainless steel in this embodiment.

[0080] A method for testing the tensile strength of paraffin uses the above device to test the tensile strength of paraffin. The specific steps are as follows:

[0081] A pair of molds 6 clamp the poured paraffin through the groove 24. The first cover plate 7 and the second cover plate 8 are fixed on both sides of the groove 24 of the mold 6 by the third bolt 9, the fourth bolt 10, the fifth bolt 11, and the sixth bolt 12, and are locked by the third nut 13, the fourth nut 14, the fifth nut 15, and the sixth nut 16. The U-shaped fixture 3 is fixed on both sides of the mold 6 by the second bolt 4 and locked by the second nut 5. The first bolt 1 abuts against the side of the mold 6 and is locked by the first nut 2. The first bolt 1 serves as the connection end of the testing machine. The testing machine applies a tensile force to the first bolt 1, and the tensile force is transmitted to the mold 6 through the fixture 3 to test the tensile strength of the paraffin. The test result takes the average value of multiple tests.

[0082] The above description of the embodiments is for enabling those of ordinary skill in the art in this technical field to understand and use the utility model. It is obvious that those skilled in the art can easily make various modifications to these embodiments and apply the general principles described herein to other embodiments without creative labor. Therefore, the present utility model is not limited to the above embodiments, and the improvements and modifications made by those skilled in the art without departing from the scope of the present utility model according to the disclosure of the present utility model should be within the protection scope of the present utility model.

Claims

1. A paraffin tensile strength testing device, characterized in that The device includes a connecting mechanism, a fixing mechanism and a fixture member. The connecting mechanism includes bolts and a fixture (3). The fixing mechanism includes bolts and a cover plate. The fixture member includes a mold (6). Paraffin is clamped by a pair of devices. The fixture (3) is U-shaped. The bottom plate of the fixture (3) passes through a bolt, and the bolt abuts against the side of the mold (6). The bolt serves as the connecting end of the testing machine. The fixture (3) clamps the side of the mold (6) through the two side plates of the fixture (3). The bolt passes through the two side plates of the fixture (3) and the mold (6), and the fixture (3) and the mold (6) are fixed by the bolt. Cover plates are arranged on both sides of the mold (6). The bolt passes through the cover plate and the mold (6), and the cover plate and the mold (6) are fixed by the bolt. A groove (24) is formed in the mold (6), and the paraffin is clamped by the groove (24).

2. The paraffin tensile strength testing device according to claim 1, characterized in that, A first bolt hole (17) is formed in the bottom plate of the fixture (3), and a first bolt (1) is inserted into the first bolt hole (17). The first bolt (1) abuts against the side of the mold (6), and the first bolt (1) serves as the connecting end of the testing machine.

3. The paraffin tensile strength testing device according to claim 2, wherein A first nut (2) is threadedly connected and locked on the first bolt (1) on the other side where the fixture (3) clamps the mold (6).

4. The paraffin tensile strength testing device according to claim 1, wherein Fixture second bolt holes (18) are formed in the two side plates of the fixture (3), and a second bolt (4) is inserted into the fixture second bolt holes (18). Mold second bolt holes (19) are formed in the mold (6), and the second bolt (4) passes through the mold second bolt holes (19). The fixture (3) and the mold (6) are fixed by the second bolt (4).

5. The paraffin tensile strength testing device according to claim 4, characterized in that, A second nut (5) is threadedly connected and locked on the second bolt (4) on the other side where the bolt head of the second bolt (4) is located outside the fixture (3).

6. The paraffin tensile strength testing device according to claim 4, wherein, The shape of the mold (6) includes circular, oval or rectangular. A groove (24) is formed on the other side of the mold second bolt hole (19) in the mold (6). The shape of the groove (24) is semi-dumbbell-shaped, and the shape of the paraffin clamped by the groove (24) is dumbbell-shaped.

7. The paraffin tensile strength testing device according to claim 1, characterized in that, The shape of the cover plate includes circular, oval or rectangular. Bolt holes are formed at the corners of the cover plate, and bolts are inserted into the bolt holes. The cover plate and the mold (6) are fixed by the bolts.

8. An apparatus for testing the tensile strength of paraffin according to claim 7, characterized in that, The cover plate includes a first cover plate (7) and a second cover plate (8). The bolts include a third bolt (9), a fourth bolt (10), a fifth bolt (11) and a sixth bolt (12).

9. The paraffin tensile strength testing device according to claim 8, characterized in that, First cover plate third bolt holes (25), first cover plate fourth bolt holes (26), first cover plate fifth bolt holes (27) and first cover plate sixth bolt holes (28) are formed at the corners of the first cover plate (7). Second cover plate third bolt holes (29), second cover plate fourth bolt holes (30), second cover plate fifth bolt holes (31) and second cover plate sixth bolt holes (32) are formed at the corners of the second cover plate (8). A third bolt (9) is inserted through the first cover plate third bolt hole (25) and the second cover plate third bolt hole (29), a fourth bolt (10) is inserted through the first cover plate fourth bolt hole (26) and the second cover plate fourth bolt hole (30), a fifth bolt (11) is inserted through the first cover plate fifth bolt hole (27) and the second cover plate fifth bolt hole (31), and a sixth bolt (12) is inserted through the first cover plate sixth bolt hole (28) and the second cover plate sixth bolt hole (32); On the mold (6), a mold third bolt hole (20), a mold fourth bolt hole (21), a mold fifth bolt hole (22) and a mold sixth bolt hole (23) are provided around the groove (24), The third bolt (9) passes through the mold third bolt hole (20), the fourth bolt (10) passes through the mold fourth bolt hole (21), the fifth bolt (11) passes through the mold fifth bolt hole (22), and the sixth bolt (12) passes through the mold sixth bolt hole (23); The first cover plate (7), the mold (6) and the second cover plate (8) are fixed by the third bolt (9), the fourth bolt (10), the fifth bolt (11) and the sixth bolt (12).

10. A paraffin tensile strength testing device according to claim 9, characterized in that, On the third bolt (9), a third nut (13) is threadedly connected and locked on the other side where the bolt head of the third bolt (9) outside the cover plate is located. On the fourth bolt (10), a fourth nut (14) is threadedly connected and locked on the other side where the bolt head of the fourth bolt (10) outside the cover plate is located. On the fifth bolt (11), a fifth nut (15) is threadedly connected and locked on the other side where the bolt head of the fifth bolt (11) outside the cover plate is located. On the sixth bolt (12), a sixth nut (16) is threadedly connected and locked on the other side where the bolt head of the sixth bolt (12) outside the cover plate is located.

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