Laboratory sample oscillator based on food safety detection

Abstract

The invention relates to a laboratory sample oscillator based on food safety detection, which comprises a fixed rack, a fixed sleeve is welded on the fixed rack, a mounting frame is fixedly connected to the fixed sleeve through a support rod, an oscillation assembly is arranged on the mounting frame, and the oscillation assembly comprises a swing arm and an annular mounting seat fixedly connected to one end of the swing arm. A self-tightening fixing assembly is arranged on the annular mounting seat; according to the invention, the movable block is driven by the rotating disc to reciprocate, so that the placement cylinder is driven to rotate intermittently while the placement cylinder carries the sample tube to oscillate vertically, the oscillation intensity of each area on the inner wall of the sample tube is increased, and the effect of fully mixing samples with relatively high viscosity in all aspects is realized; and then the sample tube is eccentrically clamped and fixed by the self-tightening fixing assembly, so that the position of the sample tube is changed in real time while self-tightening anti-dropping clamping is realized, the change of the oscillation frequency is realized, and the oscillation quality and efficiency are further improved.

Description

Technical Field

[0001] The invention relates to the technical field of oscillation equipment, and in particular to a laboratory sample oscillator based on food safety detection. Background Art

[0002] In the laboratory, many samples need to go through an oscillation mixing step during the pretreatment stage before testing to ensure uniform distribution of sample components. This is usually done by holding the sample tube and swinging the arm up and down to achieve oscillation mixing of the sample. However, the oscillation effect of this operation method cannot be guaranteed, and once a large number of samples are encountered, the labor cost is greatly increased and the work efficiency is greatly reduced.

[0003] For example, in the prior art, there is an automatic oscillating mixing device for sample pretreatment with publication number CN111366443A. Although it can automatically oscillate samples for food testing and reduce the burden on operators, due to its single oscillation direction, when processing samples with high viscosity, this single oscillation method often makes it difficult to reach the inner wall area inside the oscillation path of the sample tube. Under the action of the oscillating centrifugal force, the oscillation intensity of this area is low, making it difficult for the samples in this area to be effectively shaken, which is easy to affect the oscillation quality and subsequent test results. If the oscillation quality is improved by extending the oscillation time, the oscillation efficiency will be reduced and the experimental time will be extended.

[0004] In view of the above technical defects, a solution is now proposed. Summary of the invention

[0005] The purpose of the present invention is to provide a laboratory sample oscillator based on food safety testing to solve the above-mentioned technical defects.

[0006] The object of the present invention can be achieved by the following technical scheme: a laboratory sample oscillator based on food safety detection, comprising a fixed frame, a fixed sleeve welded on the fixed frame, and a plurality of support rods fixedly connected to the annular outer wall of the fixed sleeve, the ends of the support rods are fixedly connected to a mounting frame, and an oscillation component is arranged on the mounting frame;

[0007] The oscillating assembly comprises a swing arm rotatably mounted in a mounting frame, and an annular mounting seat fixedly connected to one end of the swing arm, wherein a self-tightening fixing assembly is arranged on the annular mounting seat;

[0008] The self-tightening fixing assembly includes a placement cylinder rotatably mounted on an annular mounting seat, a trapezoidal plate matching the placement cylinder is arranged inside the placement cylinder, and a rotating disk for driving the swing arm to swing and the placement cylinder to rotate is installed on the fixing sleeve.

[0009] Preferably, a rotating shaft rotatably connected to the fixed sleeve is fixedly connected to the bottom of the rotating disk, a motor for driving the rotating shaft to rotate is installed on the bottom bolts of the fixed frame, and an annular wave groove is provided on the annular outer wall of the rotating disk.

[0010] Preferably, the annular wave groove includes a plurality of swing oblique sections and buffer oblique sections located at both ends of the swing oblique sections.

[0011] Preferably, a U-shaped block slidably connected to the rotating disk is welded on one side of the mounting frame through a support plate, a movable block is slidably connected inside the U-shaped block, a guide pin matching the annular wave groove is fixedly connected to one side of the movable block, and an auxiliary arm hinged to the movable block is slidably connected inside the swing arm.

[0012] Preferably, a ratchet is fixedly connected to the outer wall of the placement cylinder, a mounting groove is opened at the free end of the auxiliary arm, a rotating rod is rotatably connected inside the mounting groove, and a pawl cooperating with the ratchet is fixedly connected to the rotating rod.

[0013] Preferably, a torsion spring is fixedly connected between the top of the pawl and the mounting groove and located on the outside of the rotating rod, and a plurality of elastic sheets matching with the ratchet are fixedly connected to the annular inner wall of the annular mounting seat.

[0014] Preferably, one side of the trapezoidal plate is symmetrically fixedly connected to a guide rod slidably connected to the placement tube, the trapezoidal plate is rotatably connected to a screw threadedly connected to the placement tube, and the free end of the screw is fixedly connected to a knob, the bottom of the placement tube is fixedly connected to an elastic protective pad, and the side of the placement tube away from the trapezoidal plate is fixedly connected to an elastic anti-skid plate.

[0015] Preferably, a trapezoidal clamping block is arranged on the inclined surface of the trapezoidal plate, a slide rail is installed on the trapezoidal plate, a slide groove matching the slide rail is opened on the inclined surface of the trapezoidal clamping block, an arc groove is opened on one side of the trapezoidal clamping block, and an elastic anti-slip plate 2 is fixedly connected in the arc groove.

[0016] The beneficial effects of the present invention are as follows:

[0017] (1) The present invention drives the movable block to reciprocate by rotating the rotating disk and guiding the guide pin with the annular wave groove, and drives the swing arm to carry the placement tube to swing up and down in combination with the auxiliary arm. While the sample tube is vertically oscillating, the pawl is driven to intermittently contact the ratchet wheel, and the reversal of the ratchet wheel is limited by the elastic sheet, so that the placement tube is forced to intermittently rotate in one direction while swinging up and down, so that the annular inner wall of each area of ​​the sample tube rotates to the area of ​​maximum centrifugal force, thereby increasing the oscillation intensity, thereby eliminating the problem that the food test sample with high viscosity is difficult to move on the inner wall of one side of the sample tube, resulting in inability to fully mix, thereby achieving a comprehensive and full mixing effect of the sample inside the sample tube;

[0018] (2) The present invention also promotes the eccentric clamping and fixing of the sample tube by the trapezoidal plate by the movement of the trapezoidal plate. During the vertical oscillation, the upward swinging inertia of the sample tube drives the trapezoidal clamping block to move. The inclined surface on the opposite side of the trapezoidal clamping block and the trapezoidal plate is used to increase the clamping force on the sample tube autonomously, thereby effectively preventing the sample tube from falling off due to the swinging inertia, thereby ensuring the safety and stability of the experiment.

[0019] In addition, by eccentrically clamping the sample tube and combining the unidirectional intermittent rotation of the placement tube, the distance between the sample tube and the rotating disk can be changed in real time, thereby adjusting the fixed oscillation frequency during the oscillation process and further improving the oscillation quality and efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The present invention will be further described below in conjunction with the accompanying drawings;

[0021] Figure 1 It is a schematic diagram of the structure of the present invention;

[0022] Figure 2 It is a schematic diagram of the installation of the oscillating assembly of the present invention;

[0023] Figure 3 It is a structural schematic diagram of the rotating disk of the present invention;

[0024] Figure 4 It is a schematic diagram of the cooperation between the oscillating component and the self-tightening fixing component of the present invention;

[0025] Figure 5 It is a schematic diagram of the cooperation between the swing arm and the auxiliary arm of the present invention;

[0026] Figure 6 It is a structural schematic diagram of the annular mounting seat of the present invention;

[0027] Figure 7 It is a structural schematic diagram of the auxiliary arm of the present invention;

[0028] Figure 8 It is a schematic diagram of the cooperation between the ratchet wheel and the pawl of the present invention;

[0029] Fig. 9 It is a structural schematic diagram of the self-tightening fixing assembly of the present invention;

[0030] Fig.10 It is a schematic diagram of the separation of the trapezoidal plate and the trapezoidal clamping block of the present invention.

[0031] Legend:

[0032] 1. Fixed frame; 11. Fixed sleeve; 12. Support rod; 13. Mounting frame; 14. U-shaped block;

[0033] 2. Oscillation assembly; 21. Swing arm; 22. Ring mounting seat; 23. Movable block; 24. Guide pin; 25. Auxiliary arm; 26. Ratchet; 27. Torsion spring; 28. Elastic sheet;

[0034] 3. Self-tightening fixing assembly; 31. Placement cylinder; 32. Trapezoidal plate; 33. Ratchet; 34. Guide rod; 35. Screw; 36. Elastic protective pad; 37. Elastic anti-slip plate 1; 38. Trapezoidal clamping block; 39. Elastic anti-slip plate 2;

[0035] 4. Rotating disk; 41. Rotating shaft; 42. Motor; 43. Annular wave groove. DETAILED DESCRIPTION

[0036] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0037] Example 1: Please refer to Figure 1-Figure 9 As shown, the problem that it is difficult to fully mix samples with high viscosity in the prior art due to the single oscillation direction can be solved by the following solution;

[0038] The laboratory sample oscillator based on food safety testing in this embodiment includes a fixed frame 1, a plurality of support columns distributed in a rectangular array are welded to the bottom of the fixed frame 1, and are used to stably support the fixed frame 1, a fixed sleeve 11 is welded to the fixed frame 1, and a plurality of support rods 12 are fixedly connected to the annular outer wall of the fixed sleeve 11, and the ends of the support rods 12 are fixedly connected to the mounting frame 13, and the mounting frame 13 is provided with an oscillation component 2;

[0039] By setting a plurality of oscillating components 2, during use, a plurality of sample tubes can be synchronously oscillated at the same time. The oscillating component 2 includes a swing arm 21 rotatably mounted in the mounting frame 13, and an annular mounting seat 22 fixedly connected to one end of the swing arm 21. The sample tube is fixed by the self-tightening fixing component 3, and then the vertical oscillation processing of the sample tube is realized by the positive and negative deflection swing of the swing arm 21, the annular mounting seat 22 and the self-tightening fixing component 3.

[0040] A self-tightening fixing component 3 is provided on the annular mounting seat 22, which is used to fix the sample tube during the oscillation process. The self-tightening fixing component 3 includes a placement cylinder 31 rotatably mounted on the annular mounting seat 22, and a trapezoidal plate 32 matching with it is provided inside the placement cylinder 31. The covered sample tube containing the food test sample is placed inside the corresponding placement cylinder 31, and the sample tube is squeezed and clamped by the trapezoidal plate 32. A rotating disk 4 for driving the swing arm 21 to swing and the placement cylinder 31 to rotate is installed on the fixing sleeve 11.

[0041] The bottom of the rotating disk 4 is fixedly connected with a rotating shaft 41 which is rotatably connected to the fixed sleeve 11. The top of the rotating shaft 41 extends to the outside of the top of the fixed sleeve 11 for mounting the rotating disk 4. The bottom of the rotating shaft 41 extends to the bottom of the fixed frame 1 for connecting with the motor 42 through a transmission, so that the motor 42 drives the rotating disk 4 to rotate.

[0042] The bottom bolts of the fixed frame 1 are installed with a motor 42 for driving the rotating shaft 41 to rotate. An annular wave groove 43 is provided on the annular outer wall of the rotating disk 4. The motor 42 drives the rotating disk 4 to rotate through the rotating shaft 41. The rotating disk 4 rotates, and the guide pin 24 is guided by the annular wave groove 43, so that the movable block 23 is prompted to move back and forth.

[0043] The annular wave groove 43 includes a plurality of swing oblique sections and buffer oblique sections at both ends of the swing oblique sections. The swing oblique sections and the buffer oblique sections on both sides, as well as the two adjacent buffer oblique sections, are all smoothly connected. The angle between the swing oblique section and the horizontal plane of the rotating disk 4 is greater than the angle between the buffer oblique section and the horizontal plane of the rotating disk 4 (the two angles are located on the same side).

[0044] During the rotation of the rotating disk 4, the lifting and lowering speed of the guide pin 24 in the swinging oblique section is greater than the lifting and lowering speed of the guide pin 24 in the buffering oblique section, so that after the guide pin 24 enters the buffering oblique section from the swinging oblique section, the moving speed of the movable block 23 is forced to decrease, and the speed at which the placement cylinder 31 swings to the highest or lowest point is slowed down, so as to perform buffering and deceleration, thereby reducing the noise generated during the swinging process.

[0045] A U-shaped block 14 slidably connected to the rotating disk 4 is welded to one side of the mounting frame 13 through a support plate. The U-shaped block 14 is not only used for the sliding installation of the movable block 23, but also used to increase the stability of the rotating disk 4 during the rotation process. The movable block 23 is slidably connected inside the U-shaped block 14, and a guide pin 24 adapted to the annular wave groove 43 is fixedly connected to one side of the movable block 23;

[0046] The swing arm 21 is internally slidably connected with an auxiliary arm 25 hinged to the movable block 23. The rotating disk 4 rotates, and the guide pin 24 is guided by the annular wave groove 43, so that the movable block 23 moves up and down. The movable block 23 drives the swing arm 21 to carry the placement tube 31 up and down through the hinged auxiliary arm 25, thereby realizing the vertical oscillation of the sample tube.

[0047] A ratchet 33 is fixedly connected to the outer wall of the placement cylinder 31, an annular groove is provided on the outer wall of the placement cylinder 31, the annular mounting seat 22 is engaged in the annular groove, a mounting groove is provided at the free end of the auxiliary arm 25, a rotating rod is rotatably connected inside the mounting groove, and a pawl 26 matching the ratchet 33 is fixedly connected to the rotating rod, and the swing arm 21 is eccentrically arranged on one side of the axis of the annular mounting seat 22, so that when the pawl 26 moves in the direction close to the annular mounting seat 22, the pawl 26 contacts the ratchet 33 and pushes the ratchet 33 to carry the placement cylinder 31 to rotate;

[0048] When the movable block 23 moves upward in the area above the middle of the U-shaped block 14, or moves downward in the area below the middle of the U-shaped block 14, the auxiliary arm 25 is pulled away from the annular mounting seat 22, causing the pawl 26 to separate from the ratchet 33. When the movable block 23 moves downward in the area above the middle of the U-shaped block 14, or moves upward in the area below the middle of the U-shaped block 14, the auxiliary arm 25 moves close to the annular mounting seat 22, causing the pawl 26 to contact the ratchet 33, and the pawl 26 pushes the placement cylinder 31 to deflect at a small angle.

[0049] A torsion spring 27 is fixedly connected between the top of the pawl 26 and the mounting groove and located on the outside of the rotating rod. After the pawl 26 is separated from the ratchet wheel 33, the pawl 26 is deflected and reset in the axial direction of the annular mounting seat 22 under the twisting elastic force of the torsion spring 27 until one side of the pawl 26 contacts the side wall of the mounting groove. A plurality of elastic sheets 28 matching the ratchet wheel 33 are fixedly connected to the annular inner wall of the annular mounting seat 22. The plurality of elastic sheets 28 are arranged so that after the pawl 26 is separated from the ratchet wheel 33, the ratchet wheel 33 is restricted from reversing. Combined with the intermittent movement of the pawl 26 to contact the ratchet wheel 33, the placement cylinder 31 is intermittently rotated in one direction.

[0050] By continuously rotating the rotating disk 4, the placing cylinder 31 is prompted to rotate intermittently while swinging up and down, so that the annular inner wall of each area of ​​the sample tube is rotated to the farthest position from the rotating disk 4 in turn, and multi-directional vibration treatment is performed. In combination with the vertical oscillation process of the sample tube, the larger centrifugal force at this position is used to increase the oscillation intensity to eliminate the problem that the food testing sample with high viscosity is difficult to move on the inner wall of one side of the sample tube, resulting in insufficient mixing, thereby achieving an all-round and sufficient mixing effect on the sample inside the sample tube.

[0051] Example 2: Please refer to Figure 8-Figure 10As shown, the problem that the oscillation frequency is fixed and it is difficult to further improve the oscillation quality and shorten the oscillation time can be solved by the following solution;

[0052] In this embodiment, one side of the trapezoidal plate 32 is symmetrically fixedly connected to a guide rod 34 that is slidably connected to the placement tube 31, which is used to increase the movement of the trapezoidal plate 32 in the placement tube 31 and the clamping stability of the sample tube. The trapezoidal plate 32 is rotatably connected to a screw 35 that is threadedly connected to the placement tube 31, and the free end of the screw 35 is fixedly connected to a knob. The screw 35 is rotated by turning the knob to push the trapezoidal plate 32 to move. The bottom of the placement tube 31 is fixedly connected to an elastic protective pad 36 to increase the protection effect on the bottom of the sample tube. The side of the placement tube 31 away from the trapezoidal plate 32 is fixedly connected to an elastic anti-skid plate 37 to increase the contact friction between the sample tube and the inner wall of the placement tube 31, thereby improving the clamping and fixing effect.

[0053] A trapezoidal clamping block 38 is arranged on the inclined surface of the trapezoidal plate 32, a slide rail is installed on the trapezoidal plate 32, a slide groove adapted to the slide rail is opened on the inclined surface of the trapezoidal clamping block 38, the cross sections of the slide rail and the slide groove are both trapezoidal structures to prevent the trapezoidal clamping block 38 from being separated from the trapezoidal plate 32, an arc groove is opened on one side of the trapezoidal clamping block 38, and an elastic anti-slide plate 2 39 is fixedly connected in the arc groove, the arc groove is used to increase the contact area between the trapezoidal clamping block 38 and the sample tube, the elastic anti-slide plate 2 39 and the elastic anti-slide plate 1 37 are arranged to achieve elastic clamping, avoid clamping damage to the sample tube, and further increase the clamping friction;

[0054] During the rising process of the sample tube, the swing inertia generates an upward force, which in turn drives the trapezoidal clamp block 38 to move on the trapezoidal plate 32. The inclined surfaces on the opposite sides of the trapezoidal clamp block 38 and the trapezoidal plate 32 are used to autonomously increase the clamping force of the trapezoidal clamp block 38 on the sample tube, thereby avoiding the problem of the sample tube falling off due to the swing inertia, ensuring the safety and stability of the experiment, and through the eccentric fixation of the sample tube, combined with the rotation of the placement cylinder 31, the distance between the sample tube and the rotating disk 4 is changed in real time to adjust the fixed oscillation frequency during the oscillation process, thereby further improving the oscillation quality and efficiency.

[0055] Example 3: Please refer to Figure 1-Figure 10 As shown, the present invention also proposes a method for using a laboratory sample oscillator based on food safety testing, comprising the following steps:

[0056] Step 1: Place the covered sample tube containing the food test sample in the corresponding placement tube 31, turn the knob to drive the screw 35 to rotate, push the trapezoidal plate 32 to carry the trapezoidal clamping block 38 to move, and eccentrically clamp and fix the sample tube through the elastic anti-slide plate 1 37 and the elastic anti-slide plate 2 39;

[0057] Step 2: The motor 42 rotates the rotating disk 4 through the rotating shaft 41. The rotating disk 4 rotates and the guide pin 24 is guided by the multiple swinging oblique sections in the annular wave groove 43, so that the movable block 23 moves back and forth. The movable block 23 causes the swing arm 21 to swing up and down with the placement tube 31 through the hinged auxiliary arm 25, so as to vertically oscillate the sample tube. During the rising process of the sample tube, the swinging inertia generates an upward force, which in turn drives the trapezoidal clamping block 38 to move on the trapezoidal plate 32. The inclined surface on the opposite side of the trapezoidal clamping block 38 and the trapezoidal plate 32 is used to autonomously increase the clamping force of the trapezoidal clamping block 38 on the sample tube, so as to prevent the sample tube from falling off due to the swinging inertia.

[0058] When the guide pin 24 enters the buffer oblique section from the swing oblique section, the moving speed of the movable block 23 is reduced, thereby slowing down the speed at which the placement tube 31 swings to the highest or lowest point, and performing buffering and deceleration to reduce the noise generated during the swinging process;

[0059] Step 3: When the movable block 23 moves upward in the area above the middle of the U-shaped block 14, or moves downward in the area below the middle of the U-shaped block 14, the auxiliary arm 25 is pulled away from the annular mounting seat 22, causing the pawl 26 to separate from the ratchet 33, and the pawl 26 is reset under the twisting elastic force of the torsion spring 27. When the movable block 23 moves downward in the area above the middle of the U-shaped block 14, or moves upward in the area below the middle of the U-shaped block 14, the auxiliary arm 25 moves close to the annular mounting seat 22, causing the pawl 26 to contact the ratchet 33, driving the pawl 26 to deflect and pushing the placement cylinder 31 to deflect at a small angle;

[0060] Through the continuous rotation of the rotating disk 4, the placement tube 31 is caused to rotate intermittently while swinging up and down, so that the annular inner wall of each area of ​​the sample tube is rotated to the farthest position from the rotating disk 4 in turn, and multi-directional vibration treatment is performed. In combination with the larger centrifugal force at this position during the vertical oscillation of the sample tube, the oscillation intensity is increased, and through the eccentric fixation of the sample tube and the rotation of the placement tube 31, the distance between the sample tube and the rotating disk 4 is changed in real time to adjust the fixed oscillation frequency during the oscillation process, thereby further improving the oscillation quality and efficiency.

[0061] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical scheme and inventive concept of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A laboratory sample oscillator based on food safety testing, comprising a fixed frame (1), characterized in that: A fixing sleeve (11) is welded to the fixing frame (1), and a plurality of support rods (12) are fixedly connected to the annular outer wall of the fixing sleeve (11), and ends of the support rods (12) are fixedly connected to a mounting frame (13), and an oscillating assembly (2) is arranged on the mounting frame (13); The oscillating assembly (2) comprises a swing arm (21) rotatably mounted in a mounting frame (13), and an annular mounting seat (22) fixedly connected to one end of the swing arm (21), wherein a self-tightening fixing assembly (3) is provided on the annular mounting seat (22); The self-tightening fixing assembly (3) comprises a placement cylinder (31) rotatably mounted on an annular mounting seat (22), a trapezoidal plate (32) matching the placement cylinder (31) being arranged inside the placement cylinder (31), and a rotating disk (4) for driving the swing arm (21) to swing and the placement cylinder (31) to rotate being installed on the fixing sleeve (11).

2. The laboratory sample oscillator based on food safety testing according to claim 1, characterized in that: A rotating shaft (41) rotatably connected to the fixed sleeve (11) is fixedly connected to the bottom of the rotating disk (4); a motor (42) for driving the rotating shaft (41) to rotate is bolted to the bottom of the fixed frame (1); and an annular wave groove (43) is provided on the annular outer wall of the rotating disk (4).

3. The laboratory sample oscillator based on food safety detection according to claim 2, characterized in that: The annular wave groove (43) comprises a plurality of swing oblique sections and buffer oblique sections located at both ends of the swing oblique sections.

4. The laboratory sample oscillator based on food safety testing according to claim 2, characterized in that: A U-shaped block (14) slidably connected to the rotating disk (4) is welded to one side of the mounting frame (13) via a support plate; a movable block (23) is slidably connected inside the U-shaped block (14); a guide pin (24) adapted to the annular wave groove (43) is fixedly connected to one side of the movable block (23); and an auxiliary arm (25) hinged to the movable block (23) is slidably connected inside the swing arm (21).

5. The laboratory sample oscillator based on food safety testing according to claim 4, characterized in that: A ratchet (33) is fixedly connected to the outer wall of the placement cylinder (31), a mounting groove is formed at the free end of the auxiliary arm (25), a rotating rod is rotatably connected inside the mounting groove, and a ratchet pawl (26) matching the ratchet (33) is fixedly connected to the rotating rod.

6. The laboratory sample oscillator based on food safety testing according to claim 5, characterized in that: A torsion spring (27) is fixedly connected between the top of the ratchet (26) and the mounting groove and located outside the rotating rod, and a plurality of elastic sheets (28) matching with the ratchet (33) are fixedly connected to the annular inner wall of the annular mounting seat (22).

7. The laboratory sample oscillator based on food safety testing according to claim 1, characterized in that: A guide rod (34) slidably connected to the placement tube (31) is symmetrically fixedly connected to one side of the trapezoidal plate (32); a screw rod (35) threadedly connected to the placement tube (31) is rotatably connected to the trapezoidal plate (32); a knob is fixedly connected to the free end of the screw rod (35); an elastic protective pad (36) is fixedly connected to the bottom of the placement tube (31); and an elastic anti-slip plate (37) is fixedly connected to the side of the placement tube (31) away from the trapezoidal plate (32).

8. The laboratory sample oscillator based on food safety detection according to claim 7, characterized in that: A trapezoidal clamping block (38) is arranged on the inclined surface of the trapezoidal plate (32), a slide rail is mounted on the trapezoidal plate (32), a slide groove matching the slide rail is provided on the inclined surface of the trapezoidal clamping block (38), an arc groove is provided on one side of the trapezoidal clamping block (38), and a second elastic anti-slide plate (39) is fixedly connected in the arc groove.

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