Constant-temperature magnetic stirrer

Abstract

The invention discloses a constant-temperature magnetic stirrer which comprises a supporting table, a base is connected to the edge of the bottom of the supporting table through three supporting plates distributed in a circumferential array, a driving box is arranged at the bottom of the supporting table, a connecting shaft is rotationally connected into the driving box through a bearing, and a rotating disc is arranged at the top end of the connecting shaft; a magnet is arranged on the upper surface of the rotating disc, and a driving mechanism used for driving the connecting shaft to rotate is arranged in the driving box. By starting the air cylinder, under the cooperation of the extension rod, the connecting rod and the L-shaped block, the three clamping blocks make close contact with the side wall of the solution vessel at the same time, so that the solution vessel is located in the middle of the heating plate, the three clamping blocks clamp and fix the solution vessel, and the problem that in the stirring process, the solution vessel is prone to falling off can be effectively prevented. When the solution vessel moves or turns over, the solution is prevented from spilling out, and the working efficiency and the use performance are improved.

Description

Technical Field

[0001] The invention belongs to the technical field of magnetic stirring, and in particular relates to a constant temperature magnetic stirrer. Background Art

[0002] The magnetic stirrer is a laboratory instrument for liquid mixing. It is mainly used for stirring or heating and stirring low-viscosity liquids or solid-liquid mixtures at the same time. Its basic principle is to use the principle of magnetic field that like charges repel and opposite charges attract. The magnetic field is used to push the magnetic stirrer placed in the container to rotate in a circle, so as to achieve the purpose of stirring the liquid. With the heating temperature control system, the sample temperature can be heated and controlled according to the specific experimental requirements, and the temperature conditions required by the experimental conditions can be maintained to ensure that the liquid mixing meets the experimental requirements. At present, the existing magnetic stirrers on the market, when in use, the vessel containing the solution is directly placed on the magnetic stirrer, and the vessel cannot be fixed. Therefore, during the stirring process, the solution vessel is prone to displacement or even overturning, and the liquid is easy to spill, which is not conducive to the experiment and has poor stability. In addition, although there is a structure for fixing the solution vessel, the operation of this structure is complicated, and each structure needs to be operated one by one, and the steps are cumbersome, which greatly affects the experimental efficiency. Moreover, the existing magnetic stirrer only stirs and mixes by the stirrer, which makes the mixing efficiency slow, and the solution may splash during the stirring process, resulting in greater safety hazards and waste. Summary of the invention

[0003] The present invention aims to provide a constant temperature magnetic stirrer to solve the technical problems raised in the background technology.

[0004] To achieve the above-mentioned purpose, the specific technical scheme of the present invention is as follows: a constant temperature magnetic stirrer, comprising a support table, the bottom edge of the support table is connected to a base through three support plates distributed in a circular array, and a drive box is arranged at the bottom of the support table, a connecting shaft is rotatably connected to the drive box through a bearing, a turntable is arranged at the top of the connecting shaft, a magnet is arranged on the upper surface of the turntable, and a driving mechanism for driving the connecting shaft to rotate is arranged in the drive box, a heating plate is arranged in the middle part of the upper surface of the support table, a centering and fixing mechanism is arranged on the upper surface of the support table located at the periphery of the heating plate, a solution vessel is placed on the upper surface of the heating plate, a control box is arranged on one side of the support table and the base, an adjustment frame is arranged on the upper surface of the control box, a support assembly is arranged at the end of the adjustment frame located above the solution vessel, a temperature probe that can extend to the inside of the solution vessel is inserted in the central part of the support assembly, and three baffles with adjustable inclination are arranged at the periphery of the temperature probe at the bottom of the support assembly.

[0005] Preferably, the driving mechanism includes a motor installed in the inner cavity of the driving box, the motor is fixedly connected to the bottom of the support platform, and the shaft of the motor is connected to a small gear, a large gear is sleeved on the connecting shaft, the large gear is rotatably connected to the small gear, and the large gear and the small gear are meshed with each other.

[0006] Preferably, the bottom of the connecting shaft is rotatably connected to the driving box via a bearing, and there is a gap between the upper surface of the magnet and the bottom of the supporting platform.

[0007] Preferably, the centering and fixing mechanism includes a cylinder installed at the bottom of the drive box, the bottom of the piston rod of the cylinder is sleeved with a fixing seat, the side wall of the fixing seat is provided with three extension rods distributed in a circular array, the end of each extension rod is rotatably connected to a connecting rod via a rotating shaft, the top of the connecting rod is rotatably connected to an L-shaped block via a rotating shaft, three support blocks distributed in a circular array are provided at the edge of the upper surface of the support platform, the corners of the L-shaped block are rotatably connected to the back of the support block via a rotating shaft, and the top of the vertical section of the L-shaped block is fixedly connected to a clamping block distributed vertically therewith.

[0008] Preferably, the adjustment frame includes a vertical pole and a horizontal pole, the bottom of the vertical pole is fixedly connected to the upper surface of the control box, the vertical pole is slidably connected with a sliding sleeve, the sliding sleeve is sleeved on the horizontal pole and slidably connected to it left and right, and the end of the horizontal pole is fixedly connected to the support assembly.

[0009] Preferably, a first sliding hole is provided on the upper surface of one end of the sliding sleeve, and a second sliding hole is provided on the side wall of the other end, the first sliding hole and the second sliding hole are vertically distributed, and the vertical rod is slidably connected to the first sliding hole, and the cross bar is slidably connected to the second sliding hole, nuts are provided at both ends of the sliding sleeve, and a first locking bolt and a second locking bolt are respectively threadedly connected in the two nuts, an end of the first locking bolt extends into the first sliding hole and contacts the side wall of the vertical rod, and an end of the second locking bolt extends into the second sliding hole and contacts the side wall of the cross bar.

[0010] Preferably, the support assembly includes a connecting block and a disc fixed to the outside of the connecting block, the side wall of the connecting block is fixedly connected to the end of the cross bar, and the middle part of the surface of the connecting block and the disc is provided with a hole for inserting the temperature probe.

[0011] Preferably, an adjustment seat is provided at the top of the baffle, a stud is provided at the middle part of the upper surface of the adjustment seat, three through holes distributed in a circular array are provided on the surface of the disc, the top of the stud extends above the through hole and is threadedly connected with a knob.

[0012] Preferably, an annular groove is provided at the bottom of the disc at the periphery of the through hole, and a slider matching the curvature of the annular groove is provided on the upper surface of the adjustment seat, and the slider is slidably connected to the annular groove.

[0013] Preferably, a display screen and control buttons are respectively provided on the surface of the control box, and a single-chip microcomputer is provided in the inner cavity of the control box, and the single-chip microcomputer is respectively electrically connected to the heating plate, the temperature probe, the display screen, the control buttons and the motor.

[0014] A constant temperature magnetic stirrer of the present invention has the following advantages:

[0015] 1. The present invention starts the cylinder, and with the cooperation between the extension rod, the connecting rod and the L-shaped block, the three clamping blocks are in close contact with the side wall of the solution vessel at the same time, so that the solution vessel is located in the middle of the heating plate, and the three clamping blocks clamp and fix the solution vessel, which can effectively prevent the solution vessel from being displaced or turned over during the stirring process, avoid spilling of the solution, improve work efficiency and use performance, and the operation is simple and fast. Only the cylinder needs to be controlled to control the three clamping blocks to move simultaneously.

[0016] 2. The present invention sets three baffles. When the stirrer rotates to stir the solution in the solution container, the three baffles are in a stationary state. The three baffles can control the mixing effect of the agitator by adjusting the flow rate of the solution, thereby achieving a better mixing result. In the stirring process, some solution may splash out. The baffles can block the solution to avoid safety problems and waste caused by splashing of the solution. In addition, the baffles can change the tangential flow and increase the turbulent speed of the stirred liquid, thereby changing the turbulent effect, further improving the stirring and mixing effect, and making the mixing more uniform and faster, greatly improving the stirring efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present invention and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without paying creative work.

[0018] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0019] Figure 2 It is a structural schematic diagram of the centering and fixing mechanism in the present invention;

[0020] Figure 3 for Figure 2 Front view of

[0021] Figure 4 It is a structural schematic diagram of the driving mechanism in the present invention;

[0022] Figure 5 It is a structural schematic diagram of the adjustment frame in the present invention;

[0023] Figure 6 It is a structural schematic diagram of the baffle in the present invention.

[0024] Explanation of the markings in the figure: 1. Support table; 2. Support plate; 3. Base; 4. Heating plate; 5. Centering and fixing mechanism; 6. Control box; 7. Display screen; 8. Control button; 9. Adjustment frame; 10. Support assembly; 11. Temperature probe; 12. Baffle; 13. Solution container; 14. Fixing seat; 15. Extension rod; 16. Connecting rod; 17. Clamping block; 18. Support block; 19. Vertical pole; 20. Sliding sleeve; 21. Horizontal pole Rod; 22, connecting block; 23, disc; 24, driving box; 25, cylinder; 26, L-shaped block; 27, motor; 28, small gear; 29, connecting shaft; 30, large gear; 31, turntable; 32, magnet; 33, first sliding hole; 34, second sliding hole; 35, nut; 36, first locking bolt; 37, second locking bolt; 38, adjusting seat; 39, stud; 40, through hole; 41, annular slide groove. DETAILED DESCRIPTION

[0025] In the following, only some exemplary embodiments are briefly described. As those skilled in the art will appreciate, the described embodiments may be modified in various ways without departing from the spirit or scope of the embodiments of the present invention. Therefore, the drawings and descriptions are considered to be exemplary and non-restrictive in nature.

[0026] In the description of the embodiments of the present invention, it should be understood that the terms "length", "vertical", "horizontal", "top", "bottom", etc. indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing the embodiments of the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the embodiments of the present invention.

[0027] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of the embodiments of the present invention, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0028] In the embodiments of the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection, an electrical connection, or a communication; it can be a direct connection, or an indirect connection through an intermediate medium, and it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the embodiments of the present invention can be understood according to specific circumstances.

[0029] The disclosure below provides many different embodiments or examples to implement different structures of the embodiments of the present invention. In order to simplify the disclosure of the embodiments of the present invention, the parts and settings of specific examples are described below. Of course, they are only examples, and the purpose is not to limit the embodiments of the present invention. In addition, the embodiments of the present invention can repeat reference numbers and / or reference letters in different examples, and this repetition is for the purpose of simplification and clarity, which itself does not indicate the relationship between the various embodiments and / or settings discussed.

[0030] In order to better understand the purpose, structure and function of the present invention, a constant temperature magnetic stirrer of the present invention is further described in detail below in conjunction with the accompanying drawings.

[0031] like Figure 1-6 As shown, a constant temperature magnetic stirrer of the present invention comprises a support platform 1, the bottom edge of the support platform 1 is connected to a base 3 through three support plates 2 distributed in a circumferential array, and a driving box 24 is arranged at the bottom of the support platform 1, a connecting shaft 29 is rotatably connected to the driving box 24 through a bearing, a turntable 31 is arranged at the top of the connecting shaft 29, a magnet 32 ​​is arranged on the upper surface of the turntable 31, and a driving mechanism for driving the connecting shaft 29 to rotate is arranged in the driving box 24, the driving mechanism comprises a motor 27 installed in the inner cavity of the driving box 24, the motor 27 is fixedly connected to the bottom of the support platform 1, and a pinion 28 is connected to the shaft of the motor 27, and a pinion 28 is sleeved on the connecting shaft 29. A large gear 30 is provided, and the large gear 30 is rotatably connected to the small gear 28, and the large gear 30 and the small gear 28 are meshed with each other. The bottom of the connecting shaft 29 is rotatably connected to the driving box 24 through a bearing. There is a gap between the upper surface of the magnet 32 ​​and the bottom of the support platform 1. By starting the motor 27, the small gear 28 drives the large gear 30 to rotate, so that the large gear 30 drives the connecting shaft 29 to rotate, so that the connecting shaft 29 drives the turntable 31 to rotate, so that the turntable 31 drives the magnet 32 ​​to rotate, and a stirring bar is placed in the solution vessel 13. When the magnet 32 ​​rotates, it drives the stirring bar to rotate, thereby realizing stirring of the inside of the solution vessel 13.

[0032] A heating plate 4 is arranged in the middle part of the upper surface of the support platform 1, and a centering and fixing mechanism 5 is arranged at the periphery of the heating plate 4 on the upper surface of the support platform 1. The centering and fixing mechanism 5 includes a cylinder 25 installed at the bottom of the driving box 24, and a fixing seat 14 is sleeved at the bottom of the piston rod of the cylinder 25. The side wall of the fixing seat 14 is provided with three extension rods 15 distributed in a circular array, and the end of each extension rod 15 is rotatably connected to a connecting rod 16 through a rotating shaft, and the top of the connecting rod 16 is rotatably connected to an L-shaped block 26 through a rotating shaft. Three support blocks 18 distributed in a circular array are arranged at the edge of the upper surface of the support platform 1, and the corners of the L-shaped block 26 are rotatably connected to the back of the support block 18 through a rotating shaft, and the vertical of the L-shaped block 26 The top of the segment is fixedly connected with a clamping block 17 which is vertically distributed therewith. When the solution vessel 13 is placed on the heating plate 4, the cylinder 25 is started so that the piston rod pushes the fixing seat 14 downward. With the cooperation between the extension rod 15, the connecting rod 16 and the L-shaped block 26, the three clamping blocks 17 are in close contact with the side walls of the solution vessel 13, so that the solution vessel 13 is located in the middle of the heating plate 4. The three clamping blocks 17 clamp and fix the solution vessel 13, which can effectively prevent the solution vessel 13 from being displaced or turned over during the stirring process, avoiding the solution from spilling, thereby improving the work efficiency and the performance of use. The operation is simple and fast. Only the cylinder 25 needs to be controlled to control the three clamping blocks 17 to move simultaneously.

[0033] A solution vessel 13 is placed on the upper surface of the heating plate 4, a control box 6 is provided on one side of the support platform 1 and the base 3, an adjustment frame 9 is provided on the upper surface of the control box 6, and a support assembly 10 is provided at the end of the adjustment frame 9 above the solution vessel 13, a temperature probe 11 that can extend into the solution vessel 13 is inserted into the center of the support assembly 10, and the adjustment frame 9 includes a vertical rod 19 and a horizontal rod 21, the bottom of the vertical rod 19 is fixedly connected to the upper surface of the control box 6, and a sliding sleeve 20 is slidably connected to the vertical rod 19. The sliding sleeve 20 is sleeved on the cross bar 21 and connected to it for sliding movement. The end of the cross bar 21 is fixedly connected to the support assembly 10. A first sliding hole 33 is provided on the upper surface of one end of the sliding sleeve 20, and a second sliding hole 34 is provided on the side wall of the other end. The first sliding hole 33 and the second sliding hole 34 are vertically distributed, and the vertical rod 19 is slidably connected to the first sliding hole 33, and the cross bar 21 is slidably connected to the second sliding hole 34. Nuts 35 are provided at both ends of the sliding sleeve 20. The first locking bolt 36 and the second locking bolt 36 are respectively threadedly connected in the two nuts 35. The end of the first locking bolt 36 extends into the first sliding hole 33 and contacts the side wall of the vertical rod 19, and the end of the second locking bolt 37 extends into the second sliding hole 34 and contacts the side wall of the cross bar 21. Through the cooperation between the vertical rod 19, the cross bar 21 and the sliding sleeve 20, it is convenient to make the temperature probe 11 and the baffle 12 in the inner cavity of the solution container 13, so as to realize real-time monitoring of the temperature in the solution container 13. Moreover, through the setting of the three baffles 12, when the stirrer rotates to stir the solution in the solution container 13, the three baffles 12 are in a stationary state. The three baffles 12 can control the mixing effect of the stirrer by adjusting the flow rate of the solution, so as to achieve better mixing results. In the stirring process, some solution may splash out. The baffle 12 can play a role in blocking the solution to avoid safety problems and waste caused by splashing of the solution. In addition, the baffle 12 can change the tangential flow, increase the turbulent speed of the stirred liquid, thereby changing the turbulent effect, and further improving the stirring and mixing effect.

[0034] Three baffles 12 with adjustable inclination angles are arranged at the bottom of the support assembly 10 and at the periphery of the temperature probe 11 . The support assembly 10 includes a connecting block 22 and a disc 23 fixed to the outside of the connecting block 22. The side wall of the connecting block 22 is fixedly connected to the end of the cross bar 21, and the middle part of the surface of the connecting block 22 and the disc 23 are provided with a jack for inserting the temperature probe 11. An adjustment seat 38 is provided at the top of the baffle 12, and a stud 39 is provided at the middle part of the upper surface of the adjustment seat 38. The surface of the disc 23 is provided with three through holes 40 distributed in a circular array. The top of the stud 39 extends above the through hole 40 and is threadedly connected with a knob. By loosening the knob, the stud 39 can be rotated in the through hole 40, so that the baffle 12 can rotate with the axis of the stud 39 as the center of the circle, thereby realizing the change of the inclination angle of the baffle 12, thereby changing the blocking effect of the baffle 12 on the liquid, and the inclination angle of the baffle 12 can be adjusted according to different solution amounts to reduce resistance, thereby greatly reducing the power consumption efficiency of the whole machine. An annular groove 41 is provided at the bottom of the disk 23 at the periphery of the through hole 40, and a slider matching the curvature of the annular groove 41 is provided on the upper surface of the adjustment seat 38. The slider is slidably connected to the annular groove 41. Through the cooperation between the slider and the annular groove 41, the adjustment seat 38 is limited, making the structure more stable and reliable.

[0035] The surface of the control box 6 is respectively provided with a display screen 7 and a control button 8, and the inner cavity of the control box 6 is provided with a single-chip microcomputer, which is electrically connected to the heating plate 4, the temperature probe 11, the display screen 7, the control button 8 and the motor 27 respectively. The temperature monitored by the temperature probe 11 will be displayed on the display screen 7 in real time. The start and stop of the agitator, the temperature adjustment setting and the start and stop of the cylinder 25 can be controlled by the control button 8.

[0036] The working principle of the constant temperature magnetic stirrer is as follows: when in use, a solution vessel 13 filled with a solution is placed on a heating plate 4, the air cylinder 25 is started, so that the three clamping blocks 17 center the solution vessel 13 and clamp it, a stirrer is placed inside the solution vessel 13, the adjustment frame 9 is adjusted, so that the temperature probe 11 and the baffle 12 are both inside the solution vessel 13, the temperature is set and the heating plate 4 is started for heating, the motor 27 is started, so that the magnet 32 ​​drives the stirrer to rotate and stir, and cooperates with the baffle 12 to make the solution inside the solution vessel 13 quickly and evenly mixed, the temperature probe 11 monitors the temperature inside the solution vessel 13, when the temperature reaches the set value, the heating plate 4 stops heating, if the temperature is lower than the set value, the heating plate 4 is started.

[0037] It is to be understood that the present invention is described by some embodiments, and it is known to those skilled in the art that various changes or equivalent substitutions may be made to these features and embodiments without departing from the spirit and scope of the present invention. In addition, under the teachings of the present invention, these features and embodiments may be modified to adapt to specific circumstances and materials without departing from the spirit and scope of the present invention. Therefore, the present invention is not limited by the specific embodiments disclosed herein, and all embodiments falling within the scope of the claims of this application are within the scope of protection of the present invention.

Claims

1. A constant temperature magnetic stirrer, characterized in that: The invention comprises a support platform (1), wherein the bottom edge of the support platform (1) is connected to a base (3) via three support plates (2) distributed in a circumferential array, and a drive box (24) is arranged at the bottom of the support platform (1), a connecting shaft (29) is rotatably connected to the drive box (24) via a bearing, a turntable (31) is arranged at the top of the connecting shaft (29), a magnet (32) is arranged on the upper surface of the turntable (31), and a drive mechanism for driving the connecting shaft (29) to rotate is arranged in the drive box (24), a heating plate (4) is arranged in the middle of the upper surface of the support platform (1), and the upper surface of the support platform (1) is located at a heating plate (4). A centering and fixing mechanism (5) is arranged at the periphery of the hot plate (4); a solution vessel (13) is placed on the upper surface of the hot plate (4); a control box (6) is arranged on one side of the support platform (1) and the base (3); an adjustment frame (9) is arranged on the upper surface of the control box (6); a support assembly (10) is arranged at the end of the adjustment frame (9) above the solution vessel (13); a temperature probe (11) that can extend into the interior of the solution vessel (13) is inserted into the center of the support assembly (10); and three baffles (12) with adjustable inclination angles are arranged at the bottom of the support assembly (10) at the periphery of the temperature probe (11).

2. A constant temperature magnetic stirrer according to claim 1, characterized in that: The driving mechanism comprises a motor (27) installed in the inner cavity of a driving box (24), the motor (27) being fixedly connected to the bottom of the support platform (1), and a small gear (28) being connected to the shaft of the motor (27), a large gear (30) being sleeved on the connecting shaft (29), the large gear (30) being rotatably connected to the small gear (28), and the large gear (30) and the small gear (28) being meshed with each other.

3. A constant temperature magnetic stirrer according to claim 1, characterized in that: The bottom of the connecting shaft (29) is rotatably connected to the driving box (24) via a bearing, and a distance exists between the upper surface of the magnet (32) and the bottom of the supporting platform (1).

4. A constant temperature magnetic stirrer according to claim 1, characterized in that: The centering and fixing mechanism (5) comprises a cylinder (25) installed at the bottom of the driving box (24), the bottom of the piston rod of the cylinder (25) is sleeved with a fixing seat (14), the side wall of the fixing seat (14) is provided with three extension rods (15) distributed in a circular array, the end of each extension rod (15) is rotatably connected to a connecting rod (16) via a rotating shaft, the top of the connecting rod (16) is rotatably connected to an L-shaped block (26) via a rotating shaft, and three support blocks (18) distributed in a circular array are provided at the edge of the upper surface of the support platform (1), the corner of the L-shaped block (26) is rotatably connected to the back of the support block (18) via a rotating shaft, and the top of the vertical section of the L-shaped block (26) is fixedly connected to a clamping block (17) distributed vertically therewith.

5. A constant temperature magnetic stirrer according to claim 1, characterized in that: The adjustment frame (9) comprises a vertical rod (19) and a horizontal rod (21), the bottom of the vertical rod (19) is fixedly connected to the upper surface of the control box (6), the vertical rod (19) is slidably connected to a sliding sleeve (20), the sliding sleeve (20) is sleeved on the horizontal rod (21) and slidably connected to the horizontal rod, and the end of the horizontal rod (21) is fixedly connected to the support assembly (10).

6. A constant temperature magnetic stirrer according to claim 5, characterized in that: A first sliding hole (33) is provided on the upper surface of one end of the sliding sleeve (20), and a second sliding hole (34) is provided on the side wall of the other end. The first sliding hole (33) and the second sliding hole (34) are vertically distributed, and the vertical rod (19) is slidably connected to the first sliding hole (33), and the horizontal rod (21) is slidably connected to the second sliding hole (34). Nuts (35) are provided at both ends of the sliding sleeve (20), and a first locking bolt (36) and a second locking bolt (37) are respectively threadedly connected in the two nuts (35). The end of the first locking bolt (36) extends into the first sliding hole (33) and contacts the side wall of the vertical rod (19), and the end of the second locking bolt (37) extends into the second sliding hole (34) and contacts the side wall of the horizontal rod (21).

7. A constant temperature magnetic stirrer according to claim 1, characterized in that: The support assembly (10) comprises a connecting block (22) and a disc (23) fixed to the outside of the connecting block (22); the side wall of the connecting block (22) is fixedly connected to the end of the crossbar (21); and the middle parts of the surfaces of the connecting block (22) and the disc (23) are provided with a socket for inserting a temperature probe (11).

8. A constant temperature magnetic stirrer according to claim 7, characterized in that: An adjustment seat (38) is arranged at the top end of the baffle (12), a stud (39) is arranged at the middle portion of the upper surface of the adjustment seat (38), three through holes (40) distributed in a circular array are arranged on the surface of the disk (23), and the top end of the stud (39) extends above the through hole (40) and is threadedly connected to a knob.

9. A constant temperature magnetic stirrer according to claim 8, characterized in that: An annular slide groove (41) is provided at the bottom of the disk (23) at the periphery of the through hole (40), and a sliding block whose curvature matches that of the annular slide groove (41) is provided on the upper surface of the adjustment seat (38), and the sliding block is slidably connected to the annular slide groove (41).

10. A constant temperature magnetic stirrer according to claim 1, characterized in that: The surface of the control box (6) is provided with a display screen (7) and a control button (8), and the inner cavity of the control box (6) is provided with a single-chip microcomputer, which is electrically connected to the heating plate (4), the temperature probe (11), the display screen (7), the control button (8) and the motor (27).

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