Sand equivalent tester

Abstract

The utility model discloses a sand equivalent tester which comprises a bottom plate, four fixing columns, a side plate and a top plate, the four fixing columns are fixedly connected to the four corners of the top of the bottom plate respectively, when the sand equivalent tester is used, a pull ring is pulled to drive a first limiting plate to overcome the resistance of a first spring to move upwards, so that a first inserting rod is pulled away from an inner cavity of a blind hole, and the first inserting rod is inserted into the inner cavity of the blind hole; then, a hidden handle is pulled and the side plate is driven to be far away from the bottom plate, so that the side plate can be detached, the side plate at the corresponding position is detached according to the position of the overhaul part, meanwhile, an L-shaped plate is pushed and a second limiting plate is driven to overcome the resistance of a second spring, and a second inserting rod is pulled away from an inner cavity of a fixing hole; therefore, after the four L-shaped plates are repeatedly operated in sequence, the top plate can be pulled to be far away from the fixed column, so that the top plate can be disassembled, internal elements of the tester can be completely exposed, the disassembly and maintenance process of the sand equivalent tester is optimized, and the disassembly and assembly efficiency is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of material analysis, in particular to a sand equivalent tester. Background Art

[0002] The sand equivalent tester is suitable for natural sand, artificial sand and stone chips used in asphalt mixture and cement concrete. The maximum aggregate size does not exceed 4.75mm. It measures the content of clay or impurities in fine aggregate to evaluate the cleanliness of aggregate.

[0003] Patent No. CN202022046911.1 discloses an electric sand equivalent tester, including a chassis, the chassis includes a bottom plate, the upper end of the bottom plate is fixedly connected to a side panel A, the inner wall of the side panel A is slidably connected to the side panel B, the inner wall of the side panel B is fixedly connected to a strip plate, the upper end of the strip plate is detachably connected to the top plate, the lower end of the bottom plate is fixedly connected to a threaded pipe, the inner wall of the threaded pipe is provided with a threaded groove, the internal thread of the threaded groove is screwed with a connecting column, and the lower end of the connecting column is fixedly connected to a suction cup. The utility model requires the screws to be disassembled and the top plate and the strip plate to be separated, so that the top plate is split, so that the internal components of the chassis are completely exposed to the outside, which is convenient for staff to carry out maintenance and repair, and solves the problem that when the internal components of the electric sand equivalent tester are damaged, it is not easy to disassemble and repair. On the other hand, the external thread on the outside of the connecting column is screwed along the internal thread groove of the threaded pipe, and then the bottom of the suction cup is assembled, and the suction cup is pressed against the work table, so that the four sides of the suction cup of the base are completely adsorbed on the work table, which solves the problem that the electric sand equivalent tester in the past is easy to shake on an uneven table surface, affecting the actual use of the instrument.

[0004] At present, the sand equivalent tester has certain technical deficiencies:

[0005] 1. When disassembling and repairing the sand equivalent tester, not only external tools are needed for disassembly and assembly, but also the disassembly and assembly efficiency is low;

[0006] 2. When the sand equivalent tester is adsorbed on the work surface by assembling the suction cup to improve stability, the manual adjustment method is adopted by the staff, which requires repeated adjustments during the adjustment of the suction cup, resulting in low adjustment efficiency and increased work intensity of the staff. Utility Model Content

[0007] In order to overcome the deficiencies of the prior art, one of the purposes of the utility model is to provide a sand equivalent tester.

[0008] One of the purposes of the utility model is achieved by the following technical solution:

[0009] A sand equivalent tester comprises a bottom plate, a fixed column, a side plate and a top plate, wherein the four fixed columns are fixedly connected at the four corners of the top of the bottom plate, the four side plates are respectively fitted at the four sides of the top of the bottom plate, and the four side plates are respectively located between two adjacent fixed columns, the four sides of the top of the bottom plate are provided with sliding grooves, and the inner cavity of the sliding grooves is slidably connected with sliders, the tops of the four sliders are respectively fixedly connected to the bottoms of adjacent side plates, and the four side plates are provided with hidden handles on one side away from the top center of the bottom plate, the top plate is fitted at the tops of the four side plates and the fixed columns, a clamping mechanism is provided between the top plate and the fixed columns, the bottom of the bottom plate is fixedly connected with fixed cylinders near the four corners, and the inner cavity of the fixed cylinders is provided with an adjustment mechanism.

[0010] Furthermore, a blind hole is provided at the middle position of the top of the side plate, a first cavity is provided on the top plate near the edge of the straight side, and the inner cavity of the first cavity is slidably connected to a first limit plate, a first insertion rod is penetrated through the first limit plate, first through holes are provided at the top and bottom of the first cavity, and the bottom end of the first insertion rod penetrates the adjacent first through hole and is inserted into the inner cavity of the blind hole, the top end of the first insertion rod penetrates the inner cavity of the adjacent first through hole and is fixedly connected with a pull ring, the outer wall of the first insertion rod is sleeved with a first spring, and the two ends of the first spring are respectively fixedly connected to the inner wall of the first cavity and the top of the first limit plate.

[0011] Further, the clamping mechanism includes a positioning column, and the positioning column is fixedly connected to the top end of the fixing column, a positioning groove is provided on the top plate near the corner, and the fixing column is inserted in the inner cavity of the positioning groove, a fixing hole is provided on the fixing column, a second cavity is provided on the top plate near the corner, and the inner cavity of the second cavity is slidably connected with a second limiting plate, a second through-hole is provided on one side of the second cavity near an adjacent positioning groove, and the inner cavity of the second through-hole is slidably connected with a second plug rod, one end of the second plug rod passes through the inner cavity of the adjacent fixing hole, and the other end of the second plug rod is fixedly connected to the second limiting plate, the other side of the second limiting plate is fixedly connected with a second spring, and the other end of the second spring is fixedly connected to the inner side wall of the second cavity, a limiting groove is provided on the top of the second cavity, and the inner cavity of the limiting groove is slidably connected with a limiting block, the bottom of the limiting block is fixedly connected to the top of the second limiting plate, and the top of the limiting block is fixedly connected with an L-shaped plate.

[0012] Furthermore, the bottom of the L-shaped plate is arranged to fit the top of the top plate, and the top-view cross-sectional area of ​​the L-shaped plate is larger than the top-view cross-sectional area of ​​the rectangular slot.

[0013] Furthermore, the adjusting mechanism includes a fixing plate, and the fixing plate is fixedly connected to the inner cavity of the fixing cylinder, the fixing plate is provided with an opening, and the bottom of the opening is fixedly connected to a cylindrical air bag, the top of the opening is fitted with a cover plate, and a circular hole is provided at the middle position of the cover plate, the inner cavity of the circular hole is rotatably connected to an inflation tube, the outer wall of the inflation tube is sleeved with a sealing ring, and the bottom of the sealing ring is fixedly connected to the cover plate, a third cavity is provided at the middle position of the bottom plate, and an air pump is fixedly installed on the bottom of the inner cavity of the third cavity, the bottom of the air pump is fixedly connected to an intake pipe, and the bottom end of the intake pipe passes through the bottom plate and extends to the outside of the bottom plate, the top of the air pump is fixedly connected to a connecting pipe, and the top end of the connecting pipe is fixedly connected to a five-way joint, the other end of the inflation pipe passes through the bottom plate and is fixedly connected to one side of the five-way joint, an electromagnetic valve is provided on the inflation pipe, and a spirit level is fixedly installed on the front side of the bottom plate.

[0014] Furthermore, a third through hole is opened on the outer wall of the fixed cylinder, and the inner cavity of the third through hole is slidably connected with a T-shaped rod, the T-shaped rod is arranged to fit the top of the cover plate, the outer wall of the T-shaped rod is sleeved with a third spring, and the two ends of the third spring are respectively fixedly connected to the T-shaped rod and the fixed cylinder.

[0015] Furthermore, an exhaust hole is provided on the outer wall of the fixing tube near the top, and the exhaust hole is arranged obliquely.

[0016] Compared with the prior art, the beneficial effects of the present invention are:

[0017] 1. By pulling the pull ring, the first limit plate is driven to overcome the resistance of the first spring and move upward, so that the first plug rod is pulled out of the inner cavity of the blind hole. Then, by pulling the hidden handle and driving the side plate away from the bottom plate, the side plate can be removed. The side plate at the corresponding position can be removed according to the position of the maintenance component. At the same time, by pushing the L-shaped plate and driving the second limit plate to overcome the resistance of the second spring, the second plug rod is pulled out of the inner cavity of the fixed hole. After repeating the operation on the four L-shaped plates in sequence, the top plate can be pulled away from the fixed column, so that the top plate can also be removed, and then the internal components of the tester can be completely exposed, the disassembly and maintenance process of the sand equivalent tester is optimized, and the disassembly and assembly efficiency is improved;

[0018] 2. Through the setting of the fixing cylinder, air pump, air inlet pipe, connecting pipe, five-way joint, inflation pipe, solenoid valve, fixing plate, opening, cylindrical airbag, cover plate, sealing ring, T-rod, third spring and exhaust hole, when it is necessary to adjust the height of one side of the tester, open the solenoid valve on the inflation pipe on the corresponding side, and then, by starting the air pump, the outside air can be pumped and transported into the cylindrical airbag through the connecting pipe, five-way joint and inflation pipe. After the cylindrical airbag is inflated, it will expand and contract downward, thereby raising the shorter side of the tester. Through the setting of the level meter, the staff can intuitively observe whether the sand equivalent tester is placed stably, thereby improving the stability of the sand equivalent tester during operation, and then improving the accuracy of the test analysis data.

[0019] The above description is only an overview of the technical solution of the utility model. In order to more clearly understand the technical means of the utility model, it can be implemented in accordance with the contents of the specification. In order to make the above and other purposes, features and advantages of the utility model more obvious and easy to understand, the following preferred embodiments are specifically cited and described in detail with the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 is a three-dimensional diagram of this embodiment;

[0021] Figure 2 This is a schematic diagram of the three-dimensional structure of the component fixing column of this embodiment;

[0022] Figure 3 It is a schematic diagram of the three-dimensional structure of the side panel of the component of this embodiment;

[0023] Figure 4 This is a schematic diagram of the main structure of the component base plate of this embodiment;

[0024] Figure 5 This is a schematic diagram of the connection structure of the top plate and side plates of the components of this embodiment;

[0025] Figure 6 This is a schematic diagram of the connection structure between the component top plate and the fixing column of this embodiment;

[0026] Figure 7 for Figure 4 A magnified view of the structure at center.

[0027] In the figure: 1. bottom plate; 2. fixing column; 3. side plate; 4. top plate; 5. positioning column; 6. fixing hole; 7. positioning groove; 8. second limit plate; 9. second spring; 10. second plug rod; 11. limit block; 12. L-shaped plate; 13. blind hole; 14. first limit plate; 15. first plug rod; 16. pull ring; 17. first spring; 18. hidden handle; 19. fixing cylinder; 20. air pump; 21. air inlet pipe; 22. connecting pipe; 23. five-way joint; 24. inflation pipe; 25. fixing plate; 26. opening; 27. cylindrical air bag; 28. cover plate; 29. ​​sealing ring; 30. T-shaped rod; 31. third spring; 32. exhaust hole; 33. spirit level; 34. solenoid valve. DETAILED DESCRIPTION

[0028] The present invention is further described below in conjunction with the accompanying drawings and specific implementation methods. It should be noted that, under the premise of no conflict, the various embodiments or technical features described below can be arbitrarily combined to form a new embodiment.

[0029] It should be noted that when a component is referred to as being "fixed to" another component, it may be directly on the other component or there may also be a component centered. When a component is considered to be "connected to" another component, it may be directly connected to the other component or there may also be a component centered. When a component is considered to be "set on" another component, it may be directly set on the other component or there may also be a component centered. The terms "vertical", "horizontal", "left", "right" and similar expressions used herein are for illustrative purposes only.

[0030] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art in the technical field of the present invention. The terms used herein in the specification of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention. The term "and / or" used herein includes any and all combinations of one or more of the related listed items.

[0031] See also Figures 1 to 7 , the utility model provides the following technical solutions:

[0032] Embodiment 1:

[0033] A sand equivalent tester comprises a bottom plate 1, a fixed column 2, a side plate 3 and a top plate 4, wherein the four fixed columns 2 are fixedly connected to the four corners of the top of the bottom plate 1, respectively, the four side plates 3 are respectively fitted and arranged at the four sides of the top of the bottom plate 1, and the four side plates 3 are respectively located between two adjacent fixed columns 2, a blind hole 13 is provided at the middle position of the top of the side plate 3, a first cavity is provided on the top plate 4 near the straight edge, and a first limiting plate 14 is slidably connected to the inner cavity of the first cavity, a first insertion rod 15 is penetrated through the first limiting plate 14, a first through hole is provided on the top and bottom of the first cavity, and the bottom end of the first insertion rod 15 penetrates the adjacent first through hole and is plugged into the inner cavity of the blind hole 13, and the top end of the first insertion rod 15 penetrates the adjacent first through hole The inner cavity of the first plug rod 15 is fixedly connected with a pull ring 16, the outer wall of the first plug rod 15 is sleeved with a first spring 17, and the two ends of the first spring 17 are respectively fixedly connected to the inner wall of the first cavity and the top of the first limit plate 14, so as to facilitate the disassembly and assembly of the side panel 3, and sliding grooves are provided at the four sides of the top of the bottom plate 1, and the inner cavity of the sliding groove is slidably connected with a slider, and the tops of the four sliders are respectively fixedly connected to the bottoms of the adjacent side panels 3, and the four side panels 3 are provided with a hidden handle 18 on the side away from the top center of the bottom plate 1, the top plate 4 is fitted on the top of the four side panels 3 and the fixed column 2, and a clamping mechanism is provided between the top plate 4 and the fixed column 2, and a fixing cylinder 19 is fixedly connected near the four corners of the bottom of the bottom plate 1, and an adjustment mechanism is provided in the inner cavity of the fixing cylinder 19.

[0034] The clamping mechanism includes a positioning column 5, and the positioning column 5 is fixedly connected to the top of the fixing column 2, a positioning groove 7 is opened on the top plate 4 near the corner, and the fixing column 2 is inserted in the inner cavity of the positioning groove 7, a fixing hole 6 is opened on the fixing column 2, a second cavity is opened on the top plate 4 near the corner, and the inner cavity of the second cavity is slidably connected with a second limiting plate 8, a second through hole is opened on one side of the second cavity near the adjacent positioning groove 7, and the inner cavity of the second through hole is slidably connected with a second plug rod 10, one end of the second plug rod 10 passes through the inner cavity of the adjacent fixing hole 6, and the second plug rod 10 is inserted into the inner cavity of the adjacent fixing hole 6. The other end is fixedly connected to the second limit plate 8, and the other side of the second limit plate 8 is fixedly connected to a second spring 9, and the other end of the second spring 9 is fixedly connected to the inner wall of the second cavity, and a limiting groove is opened on the top of the second cavity, and the inner cavity of the limiting groove is slidably connected to a limiting block 11, the bottom of the limiting block 11 is fixedly connected to the top of the second limit plate 8, and the top of the limiting block 11 is fixedly connected to an L-shaped plate 12, the bottom of the L-shaped plate 12 is fitted with the top of the top plate 4, and the top-view cross-sectional area of ​​the L-shaped plate 12 is larger than the top-view cross-sectional area of ​​the rectangular groove.

[0035] Working principle: When the utility model is in use, when it is necessary to disassemble the single-side side panel 3, the pull ring 16 on it can be pulled to drive the first limit plate 14 to overcome the resistance of the first spring 17 and move upward, so that the bottom end of the first plug rod 15 is pulled out of the inner cavity of the blind hole 13, and then, when the hidden handle 18 is pulled and the side panel 3 is driven to slide outward, the slider is separated from the inner cavity of the slide slot, so that the side panel 3 can be disassembled from the bottom plate 1, which is convenient for the inspection and maintenance of the components on the corresponding side inside the tester. When the tester is completely disassembled, the L-shaped plates 12 can be pushed in turn and the second limit plate 8 can be driven to overcome the resistance of the second spring 9 and move, thereby withdrawing the second insertion rod 10 from the inner cavity of the fixing hole 6. After repeating the above operation on the four L-shaped plates 12 in turn, the top plate 4 can be pulled upward and the positioning groove 7 can be separated from the positioning column 5, thereby removing the top plate 4 from the fixing column 2 and the side plate 3, and then the internal components of the tester can be completely exposed, thereby optimizing the disassembly and maintenance process of the sand equivalent tester and improving the disassembly and assembly efficiency.

[0036] Embodiment 2:

[0037] The regulating mechanism comprises a fixing plate 25, and the fixing plate 25 is fixedly connected to the inner cavity of the fixing cylinder 19, an opening 26 is provided on the fixing plate 25, and a cylindrical air bag 27 is fixedly connected to the bottom of the opening 26, a cover plate 28 is fitted on the top of the opening 26, and a circular hole is provided at the middle position of the cover plate 28, an inflatable tube 24 is rotatably connected to the inner cavity of the circular hole, a sealing ring 29 is provided on the outer wall of the inflatable tube 24, and the bottom of the sealing ring 29 is fixedly connected to the cover plate 28, a third cavity is provided at the middle position of the bottom plate 1, and an air pump 20 is fixedly installed at the bottom of the inner cavity of the third cavity, an air intake pipe 21 is fixedly connected to the bottom of the air pump 20, and the bottom end of the air intake pipe 21 passes through the bottom plate 1 and extends to the outside of the bottom plate 1, the air pump A connecting pipe 22 is fixedly connected to the top of 20, and a five-way joint 23 is fixedly connected to the top of the connecting pipe 22. The other end of the inflation pipe 24 passes through the base plate 1 and is fixedly connected to one side of the five-way joint 23. A solenoid valve 34 is arranged on the inflation pipe 24. A level 33 is fixedly installed on the front side of the base plate 1. A third through hole is opened on the outer wall of the fixed cylinder 19, and a T-shaped rod 30 is slidably connected to the inner cavity of the third through hole. The T-shaped rod 30 is fitted with the top of the cover plate 28. A third spring 31 is sleeved on the outer wall of the T-shaped rod 30, and the two ends of the third spring 31 are respectively fixedly connected to the T-shaped rod 30 and the fixed cylinder 19. An exhaust hole 32 is opened on the outer wall of the fixed cylinder 19 near the top, and the exhaust hole 32 is inclined.

[0038] Working principle: When the utility model is in use, when it is necessary to adjust the height of one side of the tester, open the solenoid valve 34 on the corresponding side inflation tube 24, then start the air pump 20 to pump the outside air and deliver it into the cylindrical airbag 27 through the connecting tube 22, the five-way joint 23 and the inflation tube 24. After the cylindrical airbag 27 is inflated, it will expand and contract downward, thereby raising the shorter side of the tester. The setting of the level 33 can facilitate the staff to visually observe whether the sand equivalent tester is placed stably, thereby improving the sand equivalent tester. The stability of the equivalent tester during operation is improved, thereby improving the accuracy of the test analysis data. When the test is completed, the T-shaped rod 30 can be pulled away from the fixed tube 19 to overcome the resistance of the third spring 31, so that the T-shaped rod 30 can be removed from the cover plate 28. Since the internal air pressure of the cylindrical airbag 27 is greater than the air pressure in the top chamber of the cover plate 28, the cover plate 28 can be pushed upward and the gas can be discharged into the fixed tube 19. The gas can be discharged through the setting of the exhaust hole 32, and the cylindrical airbag 27 can be restored to its original state, which is convenient for later use.

[0039] The above-mentioned implementation modes are only preferred implementation modes of the present invention, and cannot be used to limit the protection scope of the present invention. Any non-substantial changes and substitutions made by technicians in this field on the basis of the present invention shall fall within the scope of protection required by the present invention.

Claims

1. A sand equivalent tester, comprising a bottom plate (1), a fixed column (2), a side plate (3) and a top plate (4), characterized in that: The four fixing columns (2) are respectively fixedly connected to the top four corners of the bottom plate (1); the four side plates (3) are respectively fitted and arranged at the top four sides of the bottom plate (1); and the four side plates (3) are respectively located between two adjacent fixing columns (2); the top four sides of the bottom plate (1) are provided with sliding grooves, and the inner cavity of the sliding grooves is slidably connected with sliders; the tops of the four sliders are respectively fixedly connected to the bottoms of adjacent side plates (3); the four side plates (3) are each provided with a hidden handle (18) on one side away from the top center of the bottom plate (1); the top plate (4) is fitted and arranged at the tops of the four side plates (3) and the fixing columns (2); a clamping mechanism is provided between the top plate (4) and the fixing columns (2); the bottom of the bottom plate (1) is fixedly connected with fixing cylinders (19) near the four corners, and the inner cavity of the fixing cylinders (19) is provided with an adjustment mechanism.

2. A sand equivalent tester as claimed in claim 1, characterized in that: A blind hole (13) is provided at the middle position of the top of the side plate (3); a first cavity is provided on the top plate (4) near the straight edge, and the inner cavity of the first cavity is slidably connected to a first limiting plate (14); a first insertion rod (15) is passed through the first limiting plate (14); first through holes are provided at the top and bottom of the first cavity, and the bottom end of the first insertion rod (15) passes through an adjacent first through hole and is inserted into the inner cavity of the blind hole (13); the top end of the first insertion rod (15) passes through the inner cavity of the adjacent first through hole and is fixedly connected to a pull ring (16); a first spring (17) is sleeved on the outer wall of the first insertion rod (15), and the two ends of the first spring (17) are respectively fixedly connected to the inner wall of the first cavity and the top of the first limiting plate (14).

3. A sand equivalent tester as claimed in claim 1, characterized in that: The clamping mechanism comprises a positioning column (5), and the positioning column (5) is fixedly connected to the top end of the fixing column (2); a positioning groove (7) is provided on the top plate (4) near the corner, and the fixing column (2) is inserted into the inner cavity of the positioning groove (7); a fixing hole (6) is provided on the fixing column (2); a second cavity is provided on the top plate (4) near the corner, and the inner cavity of the second cavity is slidably connected to a second limiting plate (8); a second through hole is provided on one side of the second cavity near the adjacent positioning groove (7), and the inner cavity of the second through hole is slidably connected to a second insertion rod (10); One end of the second insertion rod (10) passes through the inner cavity of the adjacent fixing hole (6), and the other end of the second insertion rod (10) is fixedly connected to the second limiting plate (8), the other side of the second limiting plate (8) is fixedly connected to a second spring (9), and the other end of the second spring (9) is fixedly connected to the inner wall of the second cavity, the top of the second cavity is provided with a limiting groove, and the inner cavity of the limiting groove is slidably connected to a limiting block (11), the bottom of the limiting block (11) is fixedly connected to the top of the second limiting plate (8), and the top of the limiting block (11) is fixedly connected to an L-shaped plate (12).

4. A sand equivalent tester as claimed in claim 3, characterized in that: The bottom of the L-shaped plate (12) is arranged to fit the top of the top plate (4), and the top-view cross-sectional area of ​​the L-shaped plate (12) is larger than the top-view cross-sectional area of ​​the rectangular slot.

5. A sand equivalent tester as claimed in claim 1, characterized in that: The regulating mechanism comprises a fixing plate (25), and the fixing plate (25) is fixedly connected to the inner cavity of the fixing cylinder (19); an opening (26) is provided on the fixing plate (25), and a cylindrical air bag (27) is fixedly connected to the bottom of the opening (26); a cover plate (28) is fitted on the top of the opening (26), and a circular hole is provided at a middle position on the cover plate (28); an inflation tube (24) is rotatably connected to the inner cavity of the circular hole; a sealing ring (29) is sleeved on the outer wall of the inflation tube (24), and the bottom of the sealing ring (29) is fixedly connected to the cover plate (28); a third cavity is provided at a middle position on the bottom plate (1) The third cavity has an air pump (20) fixedly mounted on the bottom of the inner cavity of the third cavity, an air intake pipe (21) fixedly connected to the bottom of the air pump (20), and the bottom end of the air intake pipe (21) passes through the bottom plate (1) and extends to the outside of the bottom plate (1), a connecting pipe (22) fixedly connected to the top of the air pump (20), and a five-way joint (23) fixedly connected to the top of the connecting pipe (22), the other end of the inflation pipe (24) passes through the bottom plate (1) and is fixedly connected to one side of the five-way joint (23), a solenoid valve (34) is provided on the inflation pipe (24), and a level gauge (33) is fixedly mounted on the front side of the bottom plate (1).

6. A sand equivalent tester as claimed in claim 5, characterized in that: A third through hole is formed on the outer wall of the fixed cylinder (19), and a T-shaped rod (30) is slidably connected to the inner cavity of the third through hole. The T-shaped rod (30) is arranged in close contact with the top of the cover plate (28). A third spring (31) is sleeved on the outer wall of the T-shaped rod (30), and two ends of the third spring (31) are respectively fixedly connected to the T-shaped rod (30) and the fixed cylinder (19).

7. A sand equivalent tester as claimed in claim 6, characterized in that: An exhaust hole (32) is provided on the outer wall of the fixing cylinder (19) near the top, and the exhaust hole (32) is arranged at an angle.

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