A centrifuge for food testing

Abstract

The invention relates to the technical field of food detection, and in particular to a centrifuge for food detection, comprising a centrifuge body and a cover hingedly connected to the centrifuge body, a test tube rack connected with bolts inside the centrifuge body, a base provided at the front side of the centrifuge body, a top frame provided on the base, a rotating motor fixedly connected to the bottom of the top frame, a round rod rotatably connected to the inner side of the top frame, a top plate rotatably connected to the top of the top frame, the top of the round rod passes through the top of the top frame and is fixedly connected to the bottom of the top plate, the output end of the rotating motor passes through the bottom of the top frame and is fixedly connected to the bottom of the round rod, and a straight rod is rotatably connected to the top of the centrifuge body. When the centrifuge is used to centrifuge test tubes of different specifications and the test tube machine on the centrifuge needs to be replaced, the test tube rack to be replaced only needs to be placed on a placement table, and the test tube to be centrifuged is inserted into the test tube rack, so that the test tube rack can be automatically replaced, thereby improving the convenience of the device and saving more time for detection personnel.

Description

Technical Field

[0001] The present invention relates to the technical field of food detection, and in particular to a centrifuge for food detection. Background Art

[0002] A centrifuge is a machine that uses centrifugal force to separate components in a liquid and solid particle or a mixture of liquid and liquid. It is widely used in biology, chemistry, medicine and other fields. For example, in the process of food testing, the sample is crushed and added with a reagent, and then placed in a centrifuge. After centrifugal sedimentation, the supernatant is taken out and the drug residue or other components are detected by chromatography, spectroscopy, etc.

[0003] The prior art discloses a food testing centrifuge with publication number CN118060084A. The centrifuge directs the resultant force on a food sample in a centrifuge tube toward the bottom of the inner cavity of the centrifuge tube, thereby preventing the food sample in the centrifuge tube from moving toward the tube mouth of the centrifuge tube, reducing leakage of the food sample in the centrifuge tube during acceleration or deceleration, and reducing the workload of cleaning the centrifuge.

[0004] However, there are still some defects in the actual detection process. Since the test tube rack on the centrifuge is fixed to the rotor by bolts, when centrifuging test tubes of different sizes, it is necessary to use tools to repeatedly remove the bolts and take out the test tube rack, which is not only time-consuming and laborious, but also greatly reduces the detection efficiency of the device. When test tubes of multiple specifications need to be centrifuged at the same time, it is particularly laborious, and it cannot be automatically replaced to reduce the operating time of the inspectors and handle other matters.

[0005] Therefore, a centrifuge for food testing is proposed to solve the above problems. Summary of the invention

[0006] The purpose of the present invention is to solve the shortcomings of the background technology and to propose a centrifuge for food testing.

[0007] To achieve the above purpose, the technical solution adopted by the present invention is: a centrifuge for food testing, comprising a centrifuge body, and a cover hingedly connected to the centrifuge body, a test tube rack is bolted inside the centrifuge body, a base is provided on the front side of the centrifuge body, a top frame is provided on the base, a rotating motor is fixedly connected to the bottom of the top frame, a round rod is rotatably connected to the inner side of the top frame, a top plate is rotatably connected to the top of the top frame, the top of the round rod passes through the top of the top frame and is fixedly connected to the bottom of the top plate, the output end of the rotating motor passes through the bottom of the top frame and is fixedly connected to the bottom of the round rod, A straight rod is rotatably connected to the top of the centrifuge body, annular electromagnets are fixedly connected on both sides of the bottom of the top plate, a sliding plate is slidably connected to the outer wall of the straight rod, a screw driver is fixedly connected to the top of the sliding plate and one end away from the straight rod, a round frame is fixedly connected to the top of the centrifuge body and located outside the straight rod, a volute spring is provided on the inside of the round frame, a winding roller is fixedly connected to the outer wall of the straight rod and located above the volute spring, an upper pull rope is wound around the outer wall of the winding roller, a disc is longitudinally slidably connected to the outer wall of the round rod, and a pull rope mechanism for pulling the upper pull rope to drive the straight rod to rotate is provided on the inner side of the top frame.

[0008] In the above technical scheme, further, a pair of electric telescopic cylinders are fixedly connected to the top of the base, the output end of the electric telescopic cylinder is fixedly connected to the bottom of the top frame, a circular hole is opened at the top of the top plate and above the annular electromagnet, one end of the spiral spring is fixedly connected to the inner side of the circular frame, the other end of the spiral spring is fixedly connected to the outer wall of the straight rod, a placing table is provided on the front side of the base, the test tube rack is made of iron material that can be adsorbed by the annular electromagnet, an L-shaped push plate is fixedly connected to the top of the top plate and next to the circular hole, and an extrusion spring is fixedly connected between the bottom of the sliding plate and the outer wall of the straight rod.

[0009] In the above technical scheme, further, the rope pulling mechanism includes a bottom plate, a quarter-circular upper arc groove is provided at the bottom inner end of the top frame, a through groove is provided on the side wall of the upper arc groove, and the bottom plate is slidably connected to the inner side of the upper arc groove, one end of the upper pull rope is fixedly connected to the outer wall of the winding roller, and the other end of the upper pull rope is fixedly connected to the side wall of the bottom plate through the through groove, a circular groove is provided at the bottom of the disc, a pushing plate for pushing the bottom plate to move is slidably connected to the inner side of the circular groove, a circular spring is fixedly connected between the inner side of the circular groove and the side wall of the pushing plate, a fixed seat is fixedly connected to the top of the disc, a roller is rotatably connected to the inner side of the fixed seat, a quarter-circular lower arc groove is provided at the top of the top frame, and an upper spring is fixedly connected between the outer wall of the round rod and the top of the disc.

[0010] In the above technical solution, further, the outer wall of the roller abuts against the top inner end of the top frame, and one end of the lower arc groove is inclined.

[0011] In the above technical solution, further, upper guide rollers are rotatably connected to the inner side of the through groove and at the corners of the upper pull rope.

[0012] In the above technical solution, further, a rotating plate is fixedly connected to the outer wall of the straight rod, and a pair of limit plates for limiting the rotating plate from rotating beyond a certain degree are fixedly connected to the top of the circular frame.

[0013] In the above technical scheme, further, the side wall of the top frame is fixedly connected with an L-shaped plate, and the side wall of the L-shaped plate is fixedly connected with a side frame located next to the centrifuge body, the inner side of the side frame is slidably connected with a moving block, the top of the moving block is fixedly connected with a pushing seat, the inner side of the pushing seat is rotatably connected with a pulley for pushing the machine cover, the side wall of the moving block is fixedly connected with a pulley, the top of the L-shaped plate is provided with an L-shaped groove and runs through the inner side of the top frame, the side wall of the disc is fixedly connected with a protrusion, the top of the protrusion is slidably connected with a push rod, the bottom of the top frame is provided with a first arc groove at the same position as the rotation trajectory of the protrusion, and the L-shaped groove is connected to the first arc groove, the inner side of the first arc groove is slidably connected with a positioning block, the other end of the pull-down rope passes through the L-shaped groove and is fixedly connected to the side wall of the positioning block, and a second arc groove is provided at the top of the top frame and at the same position as the rotation trajectory of the push rod.

[0014] In the above technical solution, further, the end of the second arc-shaped groove is inclined, a lower spring is fixedly connected between the outer wall of the push rod and the top of the disc, the top of the push rod is set as a smooth arc surface, a return spring is fixedly connected between the inner side of the side frame and the side wall of the moving block, and the inner side of the L-shaped groove and the corner of the lower pull rope are rotatably connected with lower guide rollers.

[0015] In the above technical solution, further, a position sensor is provided inside the centrifuge body.

[0016] Compared with the prior art, the present invention has the following beneficial effects:

[0017] 1. When the present invention centrifuges test tubes of different specifications and needs to replace the test tube rack on the centrifuge, it is only necessary to place the test tube rack that needs to be replaced on the placement table and insert the test tube to be centrifuged into it, so that the test tube rack can be automatically replaced without the need for the inspector to use tools to disassemble it, thereby improving the convenience of the device and saving more time for the inspector.

[0018] 2. The present invention can also automatically close the centrifuge cover after replacing the test tube rack, without the need for inspection personnel to operate, thereby further improving the convenience of the device. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a schematic diagram of the front three-dimensional structure of the centrifuge of the present invention;

[0020] Figure 2 It is a rear perspective structural schematic diagram of the centrifuge of the present invention;

[0021] Figure 3 The appended Figure 2 A schematic diagram of the partially enlarged structure at center A;

[0022] Figure 4 It is a schematic diagram of the top frame of the present invention in a top view and a full cross-section three-dimensional structure;

[0023] Figure 5 It is a bottom-up three-dimensional structural schematic diagram of the sliding plate and the straight rod of the present invention;

[0024] Figure 6 It is a schematic diagram of the three-dimensional structure of the centrifuge body of the present invention from top view;

[0025] Figure 7 It is a bottom-up three-dimensional structural schematic diagram of the rotating motor and the disc of the present invention;

[0026] Figure 8 It is a top view of the three-dimensional structure of the rotating motor and the disc of the present invention;

[0027] Fig. 9 It is a schematic diagram of the three-dimensional structure of the side frame of the present invention when viewed from top;

[0028] Fig.10 It is a schematic diagram of the full-section three-dimensional structure of the top frame of the present invention when viewed from above.

[0029] In the figure: 1, centrifuge body; 2, machine cover; 3, test tube rack; 4, base; 5, top frame; 6, electric telescopic cylinder; 7, rotating motor; 8, round rod; 9, top plate; 10, straight rod; 11, ring electromagnet; 12, sliding plate; 13, screw driver; 14, round frame; 15, scroll spring; 16, winding roller; 17, upper pull rope; 18, bottom plate; 19, upper arc groove; 20, placing table; 21, disc; 22, push plate; 23, round spring; 24, fixed seat; 25, roller Wheel; 26, lower arc groove; 27, upper spring; 28, upper guide roller; 29, rotating plate; 30, limit plate; 31, L-shaped plate; 32, side frame; 33, moving block; 34, pushing seat; 35, pulley; 36, lower pull rope; 37, bump; 38, push rod; 39, first arc groove; 40, positioning block; 41, lower spring; 42, reset spring; 43, lower guide roller; 44, position sensor; 45, round hole; 46, second arc groove; 47, L-shaped push plate; 48, extrusion spring. DETAILED DESCRIPTION

[0030] In order to more clearly understand the above-mentioned objects, features and advantages of the present invention, the present invention is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0031] In the following description, many specific details are set forth to facilitate a full understanding of the present invention. However, the present invention may also be implemented in other ways different from those described herein. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0032] like Figure 1-10 A food testing centrifuge shown in the figure comprises a centrifuge body 1, and a cover 2 hingedly connected to the centrifuge body 1, a test tube rack 3 is bolted inside the centrifuge body 1, a base 4 is provided on the front side of the centrifuge body 1, a top frame 5 is provided on the base 4, a rotating motor 7 is fixedly connected to the bottom of the top frame 5, a round rod 8 is rotatably connected to the inside of the top frame 5, a top plate 9 is rotatably connected to the top of the top frame 5, the top of the round rod 8 passes through the top of the top frame 5 and is fixedly connected to the bottom of the top plate 9, the output end of the rotating motor 7 passes through the bottom of the top frame 5 and is fixedly connected to the bottom of the round rod 8, a straight rod 10 is rotatably connected to the top of the centrifuge body 1, annular electromagnets 11 are fixedly connected to both sides of the bottom of the top plate 9, and a sliding plate 12 is slidably connected to the outer wall of the straight rod 10 , a screw driver 13 is fixedly connected to the top of the sliding plate 12 and away from one end of the straight rod 10. The screw driver 13 is a machine with the functions of rotation and up and down movement, which can automatically unscrew the bolts on the test tube rack 3, and the end has a certain magnetic force, which will absorb the bolts when the bolts rotate to ensure that the bolts will not fall off. A round frame 14 is fixedly connected to the top of the centrifuge body 1 and located outside the straight rod 10. A volute spring 15 is provided on the inside of the round frame 14. A winding roller 16 is fixedly connected to the outer wall of the straight rod 10 and located above the volute spring 15. An upper pull rope 17 is wound around the outer wall of the winding roller 16. A disc 21 is longitudinally slidably connected to the outer wall of the round rod 8. A pull rope mechanism for pulling the upper pull rope 17 to drive the straight rod 10 to rotate 90 degrees is provided on the inner side of the top frame 5;

[0033] A pair of electric telescopic cylinders 6 are fixedly connected to the top of the base 4, and the output end of the electric telescopic cylinder 6 is fixedly connected to the bottom of the top frame 5. A circular hole 45 is opened at the top of the top plate 9 and above the annular electromagnet 11. The circular hole 45 avoids obstructing the normal extension and contraction of the screw driver 13. One end of the spiral spring 15 is fixedly connected to the inner side of the circular frame 14, and the other end of the spiral spring 15 is fixedly connected to the outer wall of the straight rod 10. A placing table 20 is provided on the front side of the base 4. The test tube rack 3 is made of iron material that can be adsorbed by the annular electromagnet 11. An L-shaped push plate 47 is fixedly connected to the top of the top plate 9 and next to the circular hole 45. The setting of the L-shaped push plate 47 facilitates the electric telescopic cylinder 6 to drive the top plate 9 to move downward and pull the sliding plate 12 to move downward at the same time. The sliding plate 12 is located above the top plate 9, and the release area with the L-shaped push plate 47 is small, so it will not be obstructed. An extrusion spring 48 is fixedly connected between the bottom of the sliding plate 12 and the outer wall of the straight rod 10.

[0034] The pull rope mechanism includes a bottom plate 18, a quarter-circular upper arc groove 19 is opened at the bottom end of the top frame 5, a through groove penetrating the outer wall of the top frame 5 is opened on the side wall of the upper arc groove 19, the bottom plate 18 is slidably connected to the inner side of the upper arc groove 19, one end of the upper pull rope 17 is fixedly connected to the outer wall of the winding roller 16, and the other end of the upper pull rope 17 passes through the through groove and is fixedly connected to the side wall of the bottom plate 18, a circular groove is opened at the bottom of the disc 21, and a push plate 22 for pushing the bottom plate 18 to move is slidably connected to the inner side of the circular groove, and the inner side of the circular groove and the push plate 22 are connected A circular spring 23 is fixedly connected between the side walls, a fixing seat 24 is fixedly connected to the top of the disc 21, a roller 25 is rotatably connected to the inside of the fixing seat 24, a lower arc groove 26 in a quarter circle shape is opened on the top of the top frame 5, an upper spring 27 is fixedly connected between the outer wall of the round rod 8 and the top of the disc 21, and the outer wall of the roller 25 is against the top of the top frame 5. The setting of the roller 25 can make the movement of the fixing seat 24 smoother, and one end of the lower arc groove 26 is inclined to facilitate the roller 25 to slide out from the inside of the lower arc groove 26;

[0035] When the test tube rack 3 needs to be replaced for centrifugal treatment of test tubes of different specifications, the test tube rack 3 to be replaced is first placed on the placement table 20, and the test tube to be centrifuged is inserted therein, and the cover 2 of the centrifuge body 1 is opened, and then the rotary motor 7 is controlled to start, driving the round rod 8 and the top plate 9 to rotate simultaneously, and then rotating one end of the top plate 9 to the top of the test tube rack 3 on the centrifuge body 1, and the other end to the top of the placement table 20. In this process, the rotation of the round rod 8 drives the disc 21 to rotate. At this time, the pushing plate 22 is located next to the bottom plate 18, which pushes the bottom plate 18 to slide on the inner side of the upper arc groove 19, and then pulls the upper pull rope 17 to move, and the upper pull rope 17 is pulled in the collection The winding part on the winding roller 16 is pulled out, and since the other end of the upper pull rope 17 is fixed on the winding roller 16, the winding roller 16 is driven to rotate at the same time while being pulled, and then the straight rod 10 and the sliding plate 12 are driven to rotate, and the screw driver 13 is rotated above the test tube rack 3 on the centrifuge body 1. At the same time, since one end of the volute spring 15 is fixed to the outer wall of the straight rod 10 and the other end is fixed to the inner side of the round frame 14, the volute spring 15 is gradually compressed by the rotation of the straight rod 10. Then, when the sliding plate 12 rotates 90 degrees, it drives the rotating plate 29 to rotate at the same time, so it cannot continue to rotate due to the rotation of the limit plate 30, and at the same time, the bottom plate 18 moves to the other end of the upper arc groove 19;

[0036] Then the electric telescopic cylinder 6 can be controlled to start and drive the top frame 5 to slide downward, thereby driving the top plate 9 and the annular electromagnet 11 to move downward, so that the annular electromagnet 11 contacts the two test tube racks 3, and then the annular electromagnet 11 is controlled to be energized to adsorb the two test tube racks 3, and in the process of the top plate 9 descending, the L-shaped push plate 47 will be driven to move downward at the same time, and the L-shaped push plate 47 is located above the sliding plate 12, so it will push the sliding plate 12 to move downward on the straight rod 10 at the same time, and compress the extrusion spring 48 and drive the screw driver 13 to move downward, so that the sleeve at the bottom of the screw driver 13 is inserted into the bolt, and then the screw driver 13 can be controlled to start and unscrew the bolt (the screw driver 13 is mainly composed of a telescopic structure and a rotating mechanism, which can quickly screw in and out the bolt), and then the restriction on the test tube rack 3 is released, and then the electric telescopic cylinder 6 is controlled to reset and push the top frame 5 back, and at the same time, the sliding plate 12 is reset under the thrust of the extrusion spring 48;

[0037] Finally, the rotating motor 7 is controlled to start, driving the round rod 8 and the top plate 9 to rotate. Since the bottom plate 18 is restricted and cannot move further at this time, the push plate 22 is restricted from continuing to rotate with the disc 21. Therefore, when the disc 21 rotates, the push plate 22 slides in the lower circular groove and compresses the circular spring 23, and then the test tube rack 3 to be replaced is rotated to the top of the centrifuge body 1. Repeat the above operation to install the new test tube rack 3 in the centrifuge body 1, and then reset and control the rotating motor 7 to continue to rotate, thereby driving the roller 25 above the fixing seat 24. The upper pull rope 17 is then retracted under the action of the spiral spring 15, and the sliding plate 12 is driven to reset. At the same time, the push plate 22 is also released from the restriction and pulled to reset under the elastic force of the circular spring 23. Then, before the top plate 9 is reset, the roller 25 is moved out from the other end of the lower arc groove 26 and the upper spring 27 is stretched downward.

[0038] In order to increase the service life of the device, upper guide rollers 28 are rotatably connected to the inner side of the through groove and at the corners of the upper pull rope 17. Through the setting of the upper guide rollers 28, the sliding of the upper pull rope 17 can be guided during operation, thereby avoiding friction between the upper pull rope 17 and the corners of the through groove, thereby reducing the service life of the upper pull rope 17.

[0039] In order to further improve the stability of the rope-pulling mechanism during operation, a rotating plate 29 is fixedly connected to the outer wall of the straight rod 10, and a pair of limit plates 30 are fixedly connected to the top of the round frame 14 for limiting the rotation of the rotating plate 29 exceeding 90 degrees. By setting the limit plates 30, the rotation position of the rotating plate 29 can be limited, and then the rotation position of the straight rod 10 and the sliding plate 12 can be limited, and when the top frame 5 slides downward, the upper pull rope 17 can be prevented from pulling the straight rod 10 to continue rotating.

[0040] In order to automatically close the cover 2 of the centrifuge body 1 after replacing the test tube rack 3, an L-shaped plate 31 is fixedly connected to the side wall of the top frame 5, and a side frame 32 is fixedly connected to the side wall of the L-shaped plate 31 and located next to the centrifuge body 1. A moving block 33 is slidably connected to the inner side of the side frame 32, and a pushing seat 34 is fixedly connected to the top of the moving block 33. A pulley 35 for pushing the cover 2 is rotatably connected to the inner side of the pushing seat 34. A lower pull rope 36 is fixedly connected to the side wall of the moving block 33. An L-shaped groove is opened on the top of the L-shaped plate 31 and penetrates The top frame 5 is provided inside, a protrusion 37 is fixedly connected to the side wall of the disc 21, a push rod 38 is slidably connected to the top of the protrusion 37, a first arc groove 39 is provided at the bottom of the top frame 5 and at the same position as the rotation track of the protrusion 37, and the L-shaped groove is connected to the first arc groove 39, a positioning block 40 is slidably connected to the inside of the first arc groove 39, the other end of the lower pull rope 36 passes through the L-shaped groove and is fixedly connected to the side wall of the positioning block 40, and a second arc groove 46 is provided at the top of the top frame 5 and at the same position as the rotation track of the push rod 38;

[0041] The end of the second arc groove 46 is inclined, and a lower spring 41 is fixedly connected between the outer wall of the push rod 38 and the top of the disc 21. The top of the push rod 38 is set as a smooth arc surface, which can make the push rod 38 slide out of the second arc groove 46 more smoothly. A return spring 42 is fixedly connected between the inner side of the side frame 32 and the side wall of the moving block 33. The inner side of the L-shaped groove and the corner of the lower pull rope 36 are rotatably connected with a lower guide roller 43. The lower guide roller 43 can guide the sliding of the lower pull rope 36 to avoid direct contact and friction between the lower pull rope 36 and the corner of the L-shaped groove, thereby reducing the service life of the lower pull rope 36.

[0042] When the rotating motor 7 is running to replace the test tube rack 3 and drives the replaced top plate 9 to rotate and reset, the push rod 38 on the protrusion 37 will move to the side of the positioning block 40, and then drive the disc 21 to rotate through the round rod 8 to push the positioning block 40 to slide inside the first arc groove 39 (at this time, the roller 25 at the other end will move into the lower arc groove 26, but the length of the push rod 38 is fixed, and the push rod 38 is squeezed by the top of the top frame 5, and the position will not change), and at the same time pull the lower pull rope 36, so that the moving block 33 on the other side of the pull rope slides inside the side frame 32 and gradually compresses the reset spring 42, while driving the push seat 34 and the pulley 35 to rotate, and then push the cover 2 to gradually flip downward through the pulley 35, and then when the top plate 9 is completely rotated out of the top of the centrifuge body 1, the pulley 35 will The cover 2 is completely pressed against the centrifuge body 1, and then locked by the self-locking structure between the cover 2 and the centrifuge body 1, and then the push rod 38 moves to the bottom of the second arc groove 46, and then the push rod 38 is pushed into the second arc groove 46 under the elastic force of the lower spring 41, so that the bottom of the push rod 38 will slide out from the positioning block 40, releasing the thrust on the positioning block 40, and then the moving block 33 is pushed to reset under the elastic force of the reset spring 42, and the positioning block 40 is driven to slide and reset in the first arc groove 39, and finally the top plate 9 is rotated and reset, and the push rod 38 moves out of the second arc groove 46, and the lower spring 41 is stretched by the compression of the top end of the top frame 5, so that the function of automatically closing the centrifuge cover 2 after replacing the test tube rack 3 is realized, and there is no need for the detection personnel to operate, further improving the convenience of the device.

[0043] In order to improve the stability of the device during operation, a position sensor 44 is provided on the inner side of the centrifuge body 1. By setting the position sensor 44, the end rotation position of the rotor of the centrifuge body 1 can be limited, thereby ensuring that each time the test tube rack 3 stops rotating, it is consistent with the initial position, avoiding the phenomenon that the screw driver 13 and the bolts on the test tube rack 3 do not align, thereby improving the stability of the device during operation.

[0044] The basic principles, main features and advantages of the present invention are shown and described above.

[0045] Those skilled in the art should understand that the present invention is not limited to the above-mentioned embodiments. The above-mentioned embodiments and the specification only describe the principles of the present invention. Various changes and improvements may be made to the present invention without departing from the spirit and scope of the present invention. These changes and improvements all fall within the scope of the present invention to be protected.

Claims

1. A centrifuge for food testing, comprising a centrifuge body (1), and a cover (2) hingedly connected to the centrifuge body (1), wherein a test tube rack (3) is bolted inside the centrifuge body (1), characterized in that: A base (4) is provided at the front side of the centrifuge body (1), a top frame (5) is provided on the base (4), a rotating motor (7) is fixedly connected to the bottom of the top frame (5), a round rod (8) is rotatably connected to the inner side of the top frame (5), a top plate (9) is rotatably connected to the top of the top frame (5), the top of the round rod (8) passes through the top of the top frame (5) and is fixedly connected to the bottom of the top plate (9), the output end of the rotating motor (7) passes through the bottom of the top frame (5) and is fixedly connected to the bottom of the round rod (8), a straight rod (10) is rotatably connected to the top of the centrifuge body (1), both sides of the bottom of the top plate (9) are fixedly connected, and the outer wall of the straight rod (10) passes through A sliding plate (12) is slidably connected, a screw driver (13) is fixedly connected to the top of the sliding plate (12) and at one end away from the straight rod (10), a round frame (14) is fixedly connected to the top of the centrifuge body (1) and located outside the straight rod (10), a spiral spring (15) is provided on the inside of the circular frame (14), a winding roller (16) is fixedly connected to the outer wall of the straight rod (10) and located above the spiral spring (15), an upper pull rope (17) is wound around the outer wall of the winding roller (16), a disc (21) is longitudinally slidably connected to the outer wall of the round rod (8), and a pull rope mechanism for pulling the upper pull rope (17) to drive the straight rod (10) to rotate 90 degrees is provided on the inner side of the top frame (5); A pair of electric telescopic cylinders (6) are fixedly connected to the top of the base (4), the output end of the electric telescopic cylinder (6) is fixedly connected to the bottom of the top frame (5), a circular hole (45) is opened at the top of the top plate (9) and above the annular electromagnet (11), one end of the scroll spring (15) is fixedly connected to the inner side of the circular frame (14), and the other end of the scroll spring (15) is fixedly connected to the outer wall of the straight rod (10), a placing table (20) is provided on the front side of the base (4), the test tube rack (3) is made of iron material that can be adsorbed by the annular electromagnet (11), an L-shaped push plate (47) is fixedly connected to the top of the top plate (9) and next to the circular hole (45), and an extrusion spring (48) is fixedly connected between the bottom of the sliding plate (12) and the outer wall of the straight rod (10); The pull rope mechanism comprises a bottom plate (18), a quarter-circular upper arc groove (19) is provided at the inner bottom end of the top frame (5), a through groove penetrating the outer wall of the top frame (5) is provided on the side wall of the upper arc groove (19), the bottom plate (18) is slidably connected to the inner side of the upper arc groove (19), one end of the upper pull rope (17) is fixedly connected to the outer wall of the winding roller (16), the other end of the upper pull rope (17) passes through the through groove and is fixedly connected to the side wall of the bottom plate (18), the bottom of the disc (21) is provided with a circular groove, the inner side of the circular groove is slidably connected with a groove for pushing the bottom plate (18) ) is a push plate (22) that moves, a circular spring (23) is fixedly connected between the inner side of the circular groove and the side wall of the push plate (22), a fixing seat (24) is fixedly connected to the top of the circular disc (21), a roller (25) is rotatably connected to the inner side of the fixing seat (24), a quarter-circular lower arc groove (26) is opened on the top of the top frame (5), an upper spring (27) is fixedly connected between the outer wall of the round rod (8) and the top of the circular disc (21), and the outer wall of the roller (25) is against the inner top of the top frame (5), and one end of the lower arc groove (26) is inclined.

2. A food testing centrifuge according to claim 1, characterized in that: Upper guide rollers (28) are rotatably connected to the inner side of the through groove and at the corners of the upper pull rope (17).

3. A food testing centrifuge according to claim 1, characterized in that: A rotating plate (29) is fixedly connected to the outer wall of the straight rod (10), and a pair of limiting plates (30) for limiting the rotating plate (29) from rotating more than 90 degrees are fixedly connected to the top of the circular frame (14).

4. A food testing centrifuge according to claim 1, characterized in that: The side wall of the top frame (5) is fixedly connected to an L-shaped plate (31), and the side wall of the L-shaped plate (31) is fixedly connected to a side frame (32) located next to the centrifuge body (1). A moving block (33) is slidably connected to the inner side of the side frame (32). A pushing seat (34) is fixedly connected to the top of the moving block (33). A pulley (35) for pushing the cover (2) is rotatably connected to the inner side of the pushing seat (34). A pulley (36) for pushing the cover (2) is fixedly connected to the side wall of the moving block (33). An L-shaped groove is provided on the top of the L-shaped plate (31) and passes through the inner side of the top frame (5). The disc ( 21) a protrusion (37) is fixedly connected to the side wall, a push rod (38) is slidably connected to the top of the protrusion (37), a first arc groove (39) is opened at the bottom of the top frame (5) and at the same position as the rotation trajectory of the protrusion (37), and the L-shaped groove is connected to the first arc groove (39), a positioning block (40) is slidably connected to the inside of the first arc groove (39), the other end of the pull-down rope (36) passes through the L-shaped groove and is fixedly connected to the side wall of the positioning block (40), and a second arc groove (46) is opened at the top of the top frame (5) and at the same position as the rotation trajectory of the push rod (38); The end of the second arc-shaped groove (46) is arranged at an angle, a lower spring (41) is fixedly connected between the outer wall of the push rod (38) and the top of the disc (21), the top of the push rod (38) is arranged as a smooth arc surface, a return spring (42) is fixedly connected between the inner side of the side frame (32) and the side wall of the moving block (33), and a lower guide roller (43) is rotatably connected to the inner side of the L-shaped groove and at the corner of the lower pull rope (36).

5. A food testing centrifuge according to claim 1, characterized in that: A position sensor (44) is provided inside the centrifuge body (1).

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