Door lock device and centrifuge

Abstract

Embodiments of the present application provide a door lock device, comprising a lock tongue, a mounting plate, a door lock hook assembly, and a driving assembly. A slot is formed in the door lock hook assembly. During locking, the lock tongue enters the slot and presses a first end of the slot to cause the door lock hook assembly to rotate, a second end of the slot is inserted into the lock tongue, and the driving assembly fixes the door lock hook assembly, and maintains the door lock hook assembly in a locking position; and during unlocking, the driving assembly releases the door lock hook assembly, the door lock hook assembly reaches an unlocking position after resetting, and the second end of the slot exits the lock tongue. In the embodiments of the present application, the lock tongue presses the first end of the slot to cause the door lock hook assembly to rotate, the second end of the slot is inserted into the lock tongue, and the driving assembly fixes the door lock hook assembly to the locking position; and during unlocking, the driving assembly releases the door lock hook assembly, the door lock hook assembly reaches the unlocking position after resetting, and the second end of the slot exits the lock tongue. The structure is simple and firm. During locking, it is only necessary to press the lock tongue, and then the driving assembly completes the locking, and a user does not need to hold for several seconds before releasing.

Description

A door lock device and a centrifuge

[0001] This application claims priority to Chinese Patent Application No. 202411489172.X, filed on October 24, 2024, entitled "A Door Lock Device and Centrifuge", the entire contents of which are incorporated herein by reference. Technical Field

[0002] This application relates to the field of centrifuge technology, and more particularly to a door lock device and a centrifuge. Background Technology

[0003] Centrifuges are instruments used for separating biological samples and are widely used in life sciences, medicine, chemistry, environmental protection and other fields. For safety reasons, the centrifuge door should not be opened when the centrifuge rotor is rotating at high speed; the centrifuge door should also not be easily opened if there is debris splashing inside the centrifuge chamber or if a malfunction occurs.

[0004] When existing door lock devices lock the door, the tester must press down on the door cover and hold it for a few seconds until the door cover is fully locked before releasing the hand; otherwise, there may be situations where the door cover is not locked or is not locked properly, which could lead to safety issues. Technical issues

[0005] This application provides a door lock device to address the problem in the prior art where the complete locking of a door lock device depends on the experimenter, which can easily lead to danger. Technical solutions

[0006] In a first aspect, a door lock device is provided, comprising:

[0007] Locking tongue (1);

[0008] Mounting plate (2);

[0009] The door lock hook assembly (3) and drive assembly (4) are installed on the mounting plate (2);

[0010] The door lock hook assembly (3) forms a groove (1000). During the locking process, the latch (1) enters the groove (1000) and presses the first end of the groove (1000) to make the door lock hook assembly (3) rotate. The second end of the groove (1000) is inserted into the latch (1). The drive assembly (4) fixes the door lock hook assembly (3) and keeps the door lock hook assembly (3) in the locked position. During the unlocking process, the drive assembly (4) releases the door lock hook assembly (3). After the door lock hook assembly (3) is reset, it reaches the unlocked position. The second end of the groove (1000) exits the latch (1).

[0011] Secondly, a centrifuge is provided, including a door cover (6), a cavity (7) and a door locking device described above, wherein a locking tongue (1) is fixed to the door cover (6) and a mounting plate (2) is fixed to the cavity (7).

[0012] In this embodiment, the latch presses down on the first end of the groove formed by the door lock hook assembly, causing the door lock hook assembly to rotate. The second end of the groove formed by the door lock hook assembly is inserted into the latch, and the drive assembly further fixes the door lock hook assembly to the locked position. During the unlocking process, the drive assembly releases the door lock hook assembly, and the door lock hook assembly returns to the unlocked position. The second end of the groove formed by the door lock hook assembly exits the latch. The door lock device has a simple and robust structure. The locking process only requires pressing down the latch, and then the drive assembly further completes the locking. The user does not need to hold it for several seconds before releasing it. Attached Figure Description

[0013] The above and / or additional aspects and advantages of this application will become apparent and readily understood from the following description of the embodiments taken in conjunction with the accompanying drawings, wherein:

[0014] Figure 1 is a schematic diagram of the door lock device provided in Embodiment 1 of this application;

[0015] Figure 2 is a schematic diagram of the door lock hook assembly provided in Embodiment 1 of this application;

[0016] Figure 3 is a schematic diagram of the door lock hook assembly provided in Embodiment 1 of this application in State 1;

[0017] Figure 4 is a schematic diagram of the door lock hook assembly provided in Embodiment 1 of this application in State 2;

[0018] Figure 5 is a schematic diagram of the door lock hook assembly provided in Embodiment 1 of this application in State 3;

[0019] Figure 6 is a schematic diagram of the locking trigger component provided in Embodiment 2 of this application;

[0020] Figure 7 is a schematic diagram of the centrifuge provided in Embodiment 3 of this application;

[0021] Figure 8 is a schematic diagram of the centrifuge heat dissipation air duct provided in Embodiment 3 of this application;

[0022] Figure 9 is a cross-sectional view of the centrifuge provided in Embodiment 3 of this application. Embodiments of the present invention

[0023] The embodiments of this application are described in detail below, examples of which are illustrated in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar modules or modules having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this application, and should not be construed as limiting this application. Rather, the embodiments of this application include all variations, modifications, and equivalents falling within the spirit and scope of the appended claims.

[0024] In this embodiment, the latch presses down on the first end of the groove formed by the door lock hook assembly, causing the door lock hook assembly to rotate. The second end of the groove formed by the door lock hook assembly is inserted into the latch, and the drive assembly further fixes the door lock hook assembly to the locked position. During the unlocking process, the drive assembly releases the door lock hook assembly, and the door lock hook assembly returns to the unlocked position. The second end of the groove formed by the door lock hook assembly exits the latch. The door lock device has a simple and robust structure. The locking process only requires pressing down the latch, and then the drive assembly further completes the locking. The user does not need to hold it for several seconds before releasing it.

[0025] Example 1

[0026] Figure 1 is a schematic diagram of the door lock device provided in Embodiment 1 of this application. Figure 2 is a schematic diagram of the door lock hook assembly provided in Embodiment 1 of this application. Figure 3 is a schematic diagram of the door lock hook assembly provided in Embodiment 1 of this application in State 1. Referring to Figures 1, 2, and 3, the door lock device includes a latch 1, a mounting plate 2, a door lock hook assembly 3, and a drive assembly 4. The mounting plate 2 includes at least a first fixing plate 21 and a second fixing plate 22 that are parallel to each other, and the first fixing plate 21 and the second fixing plate 22 are fixedly connected by a positioning shaft and screws, etc. The door lock hook assembly 3 and the drive assembly 4 are disposed on the mounting plate 2. In this embodiment, the door lock hook assembly 3 and the drive assembly 4 are disposed in the space between the first fixing plate 21 and the second fixing plate 22.

[0027] The door lock hook assembly 3 has a groove 1000. Figure 3 is a schematic diagram of the door lock hook assembly 3 in state one after the first fixing plate 21 is hidden. In state one, the opening of the groove 1000 is angled upward, the latch 1 can freely descend or rise, and the door lock hook assembly 3 is in the unlocked position. During the locking process, the latch 1 enters the groove 1000 and presses the first end of the groove 1000 to rotate the door lock hook assembly 3. At the same time, the second end of the groove 1000 inserts into the latch 1. At this time, the drive assembly 4 is activated to further fix the door lock hook assembly 3 and maintain the door lock hook assembly 3 in the locked position. During the unlocking process, the drive assembly 4 releases the door lock hook assembly 3, and the door lock hook assembly 3 returns to the unlocked position after resetting. The second end of the groove 1000 exits the latch 1.

[0028] As one embodiment of this application, the door lock hook assembly 3 includes a ratchet assembly 31 and a pawl assembly 32. The ratchet assembly 31 has a groove 1000 and a toothed groove 2000, and the pawl assembly 32 can engage with the ratchet assembly 31 at the toothed groove 2000. The state is the same as described above.

[0029] Figure 4 is a schematic diagram of the door lock hook assembly provided in Embodiment 1 of this application in State 2. Figure 5 is a schematic diagram of the door lock hook assembly provided in Embodiment 1 of this application in State 3. As shown in Figures 4 and 5, Figure 4 is a schematic diagram of the door lock hook assembly 3 in State 2 after the first fixing plate 21 is hidden. Figure 5 is a schematic diagram of the door lock hook assembly 3 in State 3 after the first fixing plate 21 is hidden. During the locking process, the latch 1 enters the groove 1000 and presses the first end of the groove 1000 to make the ratchet assembly 31 rotate in a preset direction, such as counterclockwise rotation. The second end of the groove 1000 is inserted into the latch 1. At the same time, the ratchet assembly 31 forces the pawl assembly 32 to rotate, and the pawl assembly 32 is inserted into the tooth groove 2000 of the ratchet assembly 31, preventing the ratchet assembly 31 from rotating in the opposite direction. That is, in State 2, the second end of the groove 1000 is inserted into the latch 1, and the pawl assembly 32 and the ratchet assembly 31 are engaged at the tooth groove 2000, preventing the ratchet assembly 31 from rotating clockwise. Then, the drive assembly 4 is activated to further drive the ratchet assembly 31 to continue rotating in the preset direction to the locking position, and maintains the ratchet assembly 31 in the locking position. That is, in state three, the ratchet assembly 31 continues to rotate counterclockwise by a certain angle relative to state two, the pawl assembly 32 disengages from the tooth groove 2000 and abuts against the tooth surface of the ratchet assembly 31, the second end of the groove 1000 is inserted more into the locking tongue 1 than in state two, and at this time the position of the ratchet assembly 31 is fixed by the drive assembly 4, which is the fully locked state.

[0030] This embodiment divides the locking process into two states, state two and state three. After the user presses the latch 1 to bring the door lock hook assembly 3 to state two and then releases the user, the door lock hook assembly 3 will not rotate in the opposite direction to the unlocked position; then the drive assembly 4 further completes the locking and fixing, and the door lock device has a simple and robust structure.

[0031] During the unlocking process, the drive assembly 4 releases the ratchet assembly 31, and the ratchet assembly 32 rotates in the opposite direction, i.e., clockwise, causing the second end of the groove 1000 to begin to disengage from the latch 1. As an embodiment of this application, the drive assembly 4 controls the pawl assembly 32 simultaneously with releasing the ratchet assembly 31, ensuring it does not obstruct the ratchet assembly 31 from moving in the opposite direction; finally, the drive assembly 4 releases the pawl assembly 32, causing the ratchet assembly 31 and pawl assembly 32 to reset and reach the unlocked position, the second end of the groove 1000 completely disengages from the latch 1, and the door lock hook assembly 3 returns from state three to state one. In another embodiment of this application, the ratchet assembly 32 rotates in the opposite direction, the pawl assembly 32 engages with the ratchet assembly 31 at the tooth groove 2000, and the door lock hook assembly 3 returns from state three to state two; then the drive assembly 4 controls the pawl assembly 32 to disengage from the tooth groove 2000, no longer preventing the ratchet assembly 31 from rotating in the opposite direction; finally, the drive assembly 4 releases the pawl assembly 32, so that the ratchet assembly 31 and the pawl assembly 32 are reset and reach the unlocked position, the second end of the groove 1000 completely disengages from the latch 1, and the door lock hook assembly 3 returns from state two to state one.

[0032] In the unlocking process of this application embodiment, the action of the control drive component 4 on the ratchet component 31 and the pawl component 32 can make the process of the groove 1000 exiting the latch 1 continuous. That is, the user feels that the latch 1 rises continuously during the unlocking process, which is more in line with the user's habit of opening the cover. Adjusting the action of the drive component 4 on the ratchet component 31 and the pawl component 32 can adjust the speed of the latch 1 rising process to adapt to the user's feeling.

[0033] In this embodiment, the latch presses down on the first end of the groove formed by the door lock hook assembly, causing the door lock hook assembly to rotate. The second end of the groove formed by the door lock hook assembly is inserted into the latch, and the drive assembly further fixes the door lock hook assembly to the locked position. During the unlocking process, the drive assembly releases the door lock hook assembly, and the door lock hook assembly returns to the unlocked position. The second end of the groove formed by the door lock hook assembly exits the latch. The door lock device has a simple and robust structure. The locking process only requires pressing down the latch, and then the drive assembly further completes the locking. The user does not need to hold it for several seconds before releasing it.

[0034] Example 2

[0035] In this embodiment, the basic structure of the door lock device is the same as that in Embodiment 1. The components that are the same as those in Embodiment 1 use the same reference numerals as those in Embodiment 1, including all the features described in Embodiment 1, which will not be repeated here.

[0036] As shown in Figures 1 to 5, in this embodiment of the application, the ratchet assembly 31 includes a ratchet 311, a door lock hook 312, and a first elastic member 313. The ratchet 311 and the door lock hook 312 are fixedly connected and form a groove 1000, with the ratchet 311 being the first end of the groove 1000 and the door lock hook 312 being the second end of the groove 1000. The pawl assembly 32 includes a pawl 321 and a second elastic member 322. The first elastic member 313 and the second elastic member 322 are torsion springs or springs. The first end of the first elastic member 313 is connected to the ratchet 311, and the second end of the first elastic member 313 is connected to the mounting plate 2. The ratchet 311 and the door lock hook 312 are held in the unlocked position under the action of the first elastic member 313. The first end of the second elastic member 322 is connected to the pawl 321, and the second end of the second elastic member 322 is connected to the mounting plate 2. The pawl 321 is held in the unlocked position under the action of the second elastic member 322.

[0037] In this embodiment, the ratchet assembly 31 further includes a first shaft 314, and the pawl assembly 32 further includes a second shaft 323. The first shaft 314 and the second shaft 323 are respectively fixedly mounted on the mounting plate 2. A first elastic element 313 is sleeved on the first shaft 314, and a second elastic element 322 is sleeved on the second shaft 323. During locking and unlocking, the ratchet 311 and the door lock hook 312 rotate around the first shaft 314 against the force of the first elastic element 313, and the pawl 321 rotates around the second shaft 323 against the force of the second elastic element 322. When the external force is removed, the ratchet 311 and the door lock hook 312 rotate and return to the unlocked position under the action of the first elastic element 313, and the pawl 321 rotates and returns to the unlocked position under the action of the second elastic element 322. Adjusting the elastic coefficients of the first elastic element 313 and the second elastic element 322 can adjust the force required for the user to press the latch 1 to bring the door lock hook assembly 3 to state two.

[0038] In this embodiment, the ratchet assembly 31 further includes a first pin 315 fixedly connected to the ratchet 311, and the pawl assembly 32 further includes a second pin 324 fixedly connected to the pawl 321. The mounting plate 2 is provided with a first limiting groove 23 and a second limiting groove 24, for example, the first limiting groove 23 and the second limiting groove 24 are provided on the first fixing plate 21. The first pin 315 is inserted into the first limiting groove 23 to limit the rotation angle of the ratchet 311, and the second pin 324 is inserted into the second limiting groove 24 to limit the rotation angle of the pawl 321.

[0039] To detect the state of the door lock hook assembly 3 and control the drive assembly 4, as an embodiment of this application, the ratchet assembly 31 includes a first micro switch 316. The door lock device also includes a locking trigger assembly 5 disposed on the mounting plate 2. Figure 6 is a schematic diagram of the locking trigger assembly provided in Embodiment 2 of this application. As shown in Figure 6, the locking trigger assembly 5 is disposed on the outside of the second fixing plate 22. The locking trigger assembly 5 includes a trigger plate 51 and a second micro switch 52. The trigger plate 51 can be held in a preset position under the action of elastic force, and rotates under the action of external force to trigger the second micro switch 52.

[0040] During the locking process, when the ratchet 311 and the door lock hook 312 leave the unlocked position, the first micro switch 316 sends a signal to the drive assembly 4, causing the drive assembly 4 to further fix the ratchet 311 and the door lock hook 312 to the locked position within a preset time. When the door lock hook assembly 3 enters state three from state two, the latch 1 descends and contacts the trigger plate 51, causing it to rotate and trigger the second micro switch 52. The second micro switch 52 sends a signal to the drive assembly 4, causing the drive assembly 4 to maintain the ratchet 311 and the door lock hook 312 in the locked position. During the unlocking process, after receiving the cover opening signal, the drive component 4 releases the ratchet assembly 31 and controls the pawl assembly 32. After the ratchet assembly 31 resets, it reaches the unlock position. The first micro switch 316 sends a signal to the drive component 4 to release the pawl assembly 32 and reset it. Alternatively, after receiving the cover opening signal, the drive component 4 releases the ratchet assembly 31, the latch 1 rises away from the trigger plate 51, the second micro switch 52 sends a signal to the drive component 4 to control the pawl assembly 32, the ratchet assembly 31 resets, and reaches the unlock position. The first micro switch 316 sends a signal to the drive component 4 to release the pawl assembly 32 and reset it.

[0041] The drive component 4 includes a combination of components such as a motor, gears, racks or belts, which are not limited here.

[0042] In this embodiment, the latch presses down on the first end of the groove formed by the door lock hook assembly, causing the door lock hook assembly to rotate. The second end of the groove formed by the door lock hook assembly is inserted into the latch, and the drive assembly further fixes the door lock hook assembly to the locked position. During the unlocking process, the drive assembly releases the door lock hook assembly, and the door lock hook assembly returns to the unlocked position. The second end of the groove formed by the door lock hook assembly exits the latch. The door lock device has a simple and robust structure. The locking process only requires pressing down the latch, and then the drive assembly further completes the locking. The user does not need to hold it for several seconds before releasing it.

[0043] Example 3

[0044] In this embodiment, the basic structure of the door lock device is the same as that of Embodiment 1 or Embodiment 2. The components that are the same as those in Embodiment 1 or Embodiment 2 use the same reference numerals as those in Embodiment 1 and Embodiment 2, including all the features described in Embodiment 1 and Embodiment 2, which will not be repeated here.

[0045] In this embodiment, the centrifuge includes a door cover 6, a cavity 7, and a door lock device. Figure 7 is a schematic diagram of the centrifuge provided in Embodiment 3 of this application. As shown in Figure 7, the latch 1 is fixed to the door cover 6, and the mounting plate 2 is fixed to the cavity 7. When the door cover 6 is closed towards the cavity 7, the latch 1 and the mounting plate 2 are in corresponding positions, and together with other components of the door lock device, they perform the locking or unlocking process.

[0046] Figure 8 is a schematic diagram of the centrifuge cooling duct provided in Embodiment 3 of this application. Figure 9 is a cross-sectional view of the centrifuge provided in Embodiment 3 of this application. As shown in Figures 7, 8, and 9, the door cover 6 can pivot relative to the cavity 7 about an axis. The door cover 6 and the cavity 7 form an enclosed space, in which components such as the rotor 8, motor 9, centrifuge cavity 10, and cooling fan 11 are accommodated. The latch 1 is fixed to the middle of the front end of the door cover 6, and the mounting plate 2 is fixed to the middle of the front end of the cavity 7 by screws on its top surface. When the door cover 6 is closed, the latch 1 and the mounting plate 2 correspond to each other. The motor 9 includes a drive part and a drive shaft part. One end of the motor 9 is fixed to the bottom of the cavity 7, and the other end of the motor 9 passes through the bottom of the centrifuge cavity 10. When the rotor 8 is loaded onto the motor 9, it is located inside the centrifuge cavity 10. The cooling fan 11 is disposed between the centrifuge cavity 10 and the rear panel of the cavity 7, and ventilation holes 71 are respectively opened at the rear ends of the left and right side panels of the cavity 7, with the ventilation holes 71 positioned relative to the cooling fan 11. Under the action of the cooling fan 11, the air outside the centrifuge enters through the ventilation hole 71 on one side of the cavity 7 and exits through the ventilation hole 71 on the other side. As an embodiment of this application, an air inlet is provided at the rear end of the door cover 6, and an air outlet is provided around the bottom of the cavity 7 to support the motor 9, forming a heat dissipation air duct. As shown in Figure 8, the air at room temperature enters through the air inlet of the door cover 6 and is guided to the top of the rotor 8. When the motor 9 drives the rotor 8 to rotate at high speed, the air around the rotor 8 rises, flows out from around the centrifuge cavity 10, and then passes down through the motor 9 and exits through the air outlet of the cavity 7, completing the heat dissipation of the rotor 8 and the motor 9. The arrows in Figure 8 indicate the direction of airflow.

[0047] To improve the heat dissipation efficiency of the rotor 8 and motor 9, in another embodiment of this application, the aforementioned air inlet and outlet are blocked, and a refrigeration system (not shown in the figure) is installed in the cavity 7 to cool the rotor 8, motor 9, and centrifugal cavity 10. The ventilation hole 71 completes the heat dissipation of the refrigeration system.

[0048] In this embodiment, the latch presses down on the first end of the groove formed by the door lock hook assembly, causing the door lock hook assembly to rotate. The second end of the groove formed by the door lock hook assembly is inserted into the latch, and the drive assembly further fixes the door lock hook assembly to the locked position. During the unlocking process, the drive assembly releases the door lock hook assembly, and the door lock hook assembly returns to the unlocked position. The second end of the groove formed by the door lock hook assembly exits the latch. The door lock device has a simple and robust structure. The locking process only requires pressing down the latch, and then the drive assembly further completes the locking. The user does not need to hold it for several seconds before releasing it.

[0049] Although embodiments of this application have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting this application. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of this application.

Claims

1. A door lock device, characterized in that, include: Locking tongue (1); Mounting plate (2); Door lock hook assembly (3) and drive assembly (4) are provided on the mounting plate (2); The door lock hook assembly (3) forms a groove (1000). During the locking process, the latch (1) enters the groove (1000) and presses the first end of the groove (1000) to make the door lock hook assembly (3) rotate. The second end of the groove (1000) is inserted into the latch (1). The drive assembly (4) fixes the door lock hook assembly (3) and keeps the door lock hook assembly (3) in the locked position. During the unlocking process, the drive assembly (4) releases the door lock hook assembly (3). After the door lock hook assembly (3) is reset, it reaches the unlocked position. The second end of the groove (1000) exits the latch (1).

2. The door lock device according to claim 1, characterized in that, The door lock hook assembly (3) includes a ratchet assembly (31) and a pawl assembly (32), wherein the ratchet assembly (31) forms the groove (1000). During the locking process, the locking tongue (1) enters the groove (1000) and presses the first end of the groove (1000) to rotate the ratchet assembly (31). The second end of the groove (1000) is inserted into the locking tongue (1). The pawl assembly (32) is inserted into the tooth groove (2000) of the ratchet assembly (31). The drive assembly (4) drives the ratchet assembly (31) to rotate to the locking position and maintains the ratchet assembly (31) in the locking position. During the unlocking process, the drive component (4) releases the ratchet assembly (31) and controls the pawl assembly (32), so that the ratchet assembly (31) and the pawl assembly (32) are reset and reach the unlock position, and the second end of the groove (1000) exits the latch (1).

3. The door lock device according to claim 2, characterized in that, The ratchet assembly (31) includes a ratchet (311), a door lock hook (312), and a first elastic element (313). The ratchet (311) and the door lock hook (312) are fixedly connected to form the groove (1000), the ratchet (311) is the first end of the groove (1000), and the door lock hook (312) is the second end of the groove (1000); The ratchet (311) and the door lock hook (312) are held in the unlocked position by the action of the first elastic member (313).

4. The door lock device according to claim 3, characterized in that, The ratchet assembly (31) includes a first shaft (314), which is fixedly mounted on the mounting plate (2); the ratchet (311) and the door lock hook (312) rotate about the first shaft (314).

5. The door lock device according to claim 3, characterized in that, The ratchet assembly (31) includes a first pin (315) fixedly connected to the ratchet (311), and a first limiting groove (23) is provided on the mounting plate (2); the first pin (315) is inserted into the first limiting groove (23) to limit the rotation angle of the ratchet (311).

6. The door lock device according to claim 3, characterized in that, The ratchet assembly (31) includes a first micro switch (316); when the ratchet (311) and the door lock hook (312) leave the unlock position, the first micro switch (316) sends a signal to the drive assembly (4).

7. The door lock device according to any one of claims 2-6, characterized in that, The pawl assembly (32) includes a pawl (321) and a second elastic element (322), wherein the pawl (321) is held in the unlocked position by the action of the second elastic element (322).

8. The door lock device according to claim 7, characterized in that, The pawl assembly (32) includes a second shaft (323), which is fixedly mounted on the mounting plate (2); the pawl (321) rotates about the second shaft (323).

9. The door lock device according to claim 7, characterized in that, The pawl assembly (32) includes a second pin (324) fixedly connected to the pawl (321), and a second limiting groove (24) is provided on the mounting plate (2); the second pin (324) is inserted into the second limiting groove (24) to limit the rotation angle of the pawl (321).

10. A centrifuge, characterized in that, The centrifuge includes a door cover (6), a cavity (7), and a door lock device as described in any one of claims 1-9, wherein the latch (1) is fixed to the door cover (6) and the mounting plate (2) is fixed to the cavity (7).

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