Self-locking lower base for biological measuring instrument

Abstract

The invention relates to the technical field of instrument equipment, in particular to a self-locking lower base for a biological measuring instrument, which comprises a base body, a fixing component and a locking component are arranged on the base body, a vacuum pump and a sucker are arranged on the fixing component, the vacuum pump is mounted on the upper end surface of the base body, and the sucker is mounted on the base body. The suction cup is installed on the lower end face of the base body, the vacuum pump is communicated with the suction cup through a pipeline, the locking assembly is provided with a locking valve, the locking valve is installed between the vacuum pump and the suction cup, when the biological measuring instrument operates, the vacuum pump is started, negative pressure is generated in the suction cup communicated with the vacuum pump at the moment, and the suction cup is locked. When the negative pressure reaches a set value, the locking valve locks the negative pressure value in the suction cup, the problem that the ophthalmology optical biological measuring instrument moves due to shaking of children in the measuring process, and consequently errors are generated in the measuring result is solved, and the stability of the ophthalmology optical biological measuring instrument in the measuring process is guaranteed.

Description

Technical Field

[0001] The invention relates to the technical field of instruments and equipment, in particular to a self-locking lower base for a biometric instrument. Background Art

[0002] A biometer is a device used to measure and record human physiological parameters or biological characteristics. It is usually used in medical treatment, health monitoring, sports training, scientific research and other fields. Among them, ophthalmic optical biometers in the medical field are mainly used in ophthalmic medical treatment and ophthalmic research. In the ophthalmic medical field, they can be used for ophthalmic diagnosis, eye disease monitoring, vision assessment, etc., and play an important role in ophthalmic medical practice.

[0003] An optometrists vehicle is a mobile ophthalmic service facility, which is usually used to provide services such as eye examination, optometry and glasses fitting. In some ophthalmic medical institutions, due to the limited number of ophthalmic optical biometers, it is necessary to move the ophthalmic optical biometers in the ophthalmic medical institutions to the optometrists vehicle. For this reason, these ophthalmic optical biometers usually need to be designed to be portable or movable to adapt to various usage scenarios. When a movable ophthalmic optical biometer is used by children, children are usually more difficult to maintain patience than adults, and are prone to feel bored or anxious during the test, thereby pulling and shaking the ophthalmic optical biometer. Therefore, in the special case of the ophthalmic optical biometer used by children, it is necessary to design the lower base of the ophthalmic optical biometer to prevent the ophthalmic optical biometer from moving due to the pulling and shaking of children during the measurement process, resulting in a decrease in the stability of the ophthalmic optical biometer, and then causing the problem of deviation in the test results.

[0004] Therefore, a self-locking lower base for a biometer is proposed to solve the problem that a movable ophthalmic optical biometer moves due to pulling and shaking by children during measurement, which causes the stability of the ophthalmic optical biometer to decrease and further causes deviation in the test results. Summary of the invention

[0005] The purpose of the present invention is to provide a self-locking lower base for a biometer to solve the problem that a movable ophthalmic optical biometer moves due to pulling and shaking by children during the measurement process, resulting in reduced stability of the ophthalmic optical biometer and further causing deviation in the detection results.

[0006] To achieve the above object, the present invention provides the following technical solutions:

[0007] A self-locking lower base for a biometric meter comprises a base body, a fixing assembly and a locking assembly are arranged on the base body, a vacuum pump and a suction cup are arranged on the fixing assembly, the vacuum pump is mounted on the upper end surface of the base body, the suction cup is mounted on the lower end surface of the base body, the vacuum pump and the suction cup are connected through a pipeline, a locking valve is arranged on the locking assembly, the locking valve is mounted between the vacuum pump and the suction cup, and the locking valve locks the adsorption pressure after the suction cup is adsorbed.

[0008] When the biometer is in operation, the vacuum pump is started, and negative pressure is generated in the suction cup connected to the vacuum pump. When the negative pressure inside the suction cup reaches a set value, the locking valve between the vacuum pump and the suction cup will lock the negative pressure value inside the suction cup, thereby preventing the movable ophthalmic optical biometer from moving due to the pulling and shaking of the child during the measurement process, resulting in a decrease in the stability of the ophthalmic optical biometer, and further causing the problem of deviation in the detection result, thereby ensuring the stability of the ophthalmic optical biometer during measurement.

[0009] Optionally, the fixing assembly includes bolts and nuts, welding joints and pins. All of the above three assemblies can fix the biometer to the desktop. The bolts and nuts achieve the functions of fixing and connecting through a threaded structure, but the bolts and nuts need to be tightened with tools, the installation process is relatively time-consuming, and they may loosen under vibration or force; welding melts the materials of two or more components and forms an integrated connection after cooling, however, once the welding is completed, the welding joint is difficult to disassemble; the pin fixes the components by inserting into the hole and forming a head on one side of the hole, however, the connection strength is generally low and it is easy to loosen or fall off due to external force, so the above three fixing assemblies are not preferred solutions of the present invention.

[0010] Preferably, the fixing assembly comprises a vacuum pump, a suction cup and a vacuum chamber, the vacuum chamber is mounted on the upper end surface of the base body, a vacuum chamber is provided in the vacuum chamber, the vacuum chamber is communicated with the vacuum pump through a pipeline, the number of the suction cups is 4, a plurality of the suction cups are respectively located at four angles of the base body, a plurality of the suction cups are communicated with the vacuum chamber through pipelines, when the vacuum pump is started, negative pressure is generated in the vacuum chamber and the suction cups communicated with the vacuum pump, the suction cups adsorb the biometer on the desktop, and a plurality of the suction cups are respectively located at the four angles of the base body, thereby avoiding the problem of deviation in the detection result due to uneven force on the suction cups during the measurement process of the ophthalmic optical biometer, and ensuring the stability of the ophthalmic optical biometer during measurement.

[0011] Preferably, the locking assembly includes a locking valve and a release valve, and the locking valve also includes a piston cylinder, a partition, a piston rod, a locking block and a spring. The piston cylinder is installed on the front end surface of the vacuum chamber, and the partition is installed in the middle of the piston cylinder. The partition is coaxially provided with a slide groove, and the piston rod is coaxially slidably connected in the slide groove. A piston cavity is also provided in the piston cylinder, and the piston cavity is located at the rear side of the piston rod. The piston cavity is connected to the vacuum cavity, and the locking block is installed on the front end surface of the piston rod. The spring is sleeved on the piston rod, and the two ends of the spring are respectively connected to the partition. The front end face is connected to the rear end face of the locking block, and a locking groove is also provided on the side of the piston cylinder. The locking block is slidably connected in the locking groove. The two ends of the locking groove are respectively connected to the vacuum pump and the vacuum chamber. An air outlet is provided at the place where the locking groove is connected to the vacuum pump. The backward movement of the locking block can cut off the connection between the vacuum pump and the vacuum chamber. The release valve is installed on the upper end face of the piston cylinder. An air inlet and an electromagnetic switch are provided in the release valve. The two ends of the air inlet are respectively connected to the locking groove and the outside of the release valve, and the electromagnetic switch is installed between the locking groove and the air inlet.

[0012] When the negative pressure inside the vacuum chamber gradually increases, the negative pressure in the piston chamber connected to the vacuum chamber also gradually increases. At this time, the piston rod is pressed to move toward the vacuum chamber. During the movement of the piston rod, the locking block is driven to move toward the partition. At this time, the spring in the piston chamber will be compressed under pressure, and the locking block slides in the locking groove. When the locking block gradually moves to the position of the air outlet, the air outlet volume of the air outlet will gradually decrease. When the locking block moves to the wall of the locking groove close to the vacuum chamber, the air outlet will no longer be able to pass through the air. At this time, the air pressure inside the vacuum chamber will be maintained at the same pressure, thereby avoiding the change of the air pressure in the vacuum chamber that causes the adsorption force to decrease, and ensuring the stability of the ophthalmic optical biometer during measurement.

[0013] Preferably, a plurality of protrusions are provided on the lower end surfaces of the plurality of suction cups, and the circumferences of the plurality of protrusions are evenly distributed on the outer ring of the suction cup, and adsorption air channels are provided between the plurality of protrusions, and the adsorption air channels are connected with the vacuum chamber through a pipeline. When negative pressure is generated inside the suction cup, the adsorption air channel transmits the negative pressure value to between the plurality of protrusions, and the distance between the suction cup and the desktop will shrink at this time. At the same time, the plurality of protrusions will support the suction cup and generate downward pressure on the desktop, thereby increasing the friction between the suction cup and the desktop, thereby avoiding the problem that the ophthalmic optical biometer is offset during the measurement process due to the small friction between the suction cup and the desktop, thereby causing the detection result of the ophthalmic optical biometer to deviate, thereby ensuring the stability of the ophthalmic optical biometer during measurement.

[0014] Preferably, the contact surfaces between the plurality of suction cups and the desktop are L-shaped, and the angle of the L-shape is the same as the angle of the side of the base body. The L-shaped contact surface between the suction cup and the desktop increases the contact surface between the suction cup and the desktop, and the setting of the L-shaped contact surface makes the force on the side of the biometer more balanced, thereby avoiding the problem of deviation in the detection result of the ophthalmic optical biometer due to uneven force on the suction cup during the measurement process of the ophthalmic optical biometer, and ensuring the stability of the ophthalmic optical biometer during measurement.

[0015] Preferably, an anti-skid pad is further provided on the lower end surface of the base body, the lower end surface of the anti-skid pad is flush with the lower end surface of the suction cup, and an anti-skid pattern is provided on the lower end surface of the anti-skid pad, and the contact surface between the anti-skid pattern and the desktop is wavy. When negative pressure is generated inside the suction cup and adsorbed to the desktop, the pressure of the anti-skid pad on the desktop will also increase. The wavy design of the anti-skid pattern can enhance the friction between the anti-skid pad and the desktop, thereby ensuring the stability of the ophthalmic optical biometer during measurement.

[0016] Preferably, the piston cylinder is provided with a re-suction switch, the lower end of which is mounted on the rear end of the locking groove, a movable block is slidably connected in the re-suction switch, the lower end of which extends into the locking groove, and the movable block is located at the rear side of the locking block, and when the locking block cuts off the air outlet, it will contact the re-suction switch, and the vacuum pump will stop working at this time, and when the suction cup is adsorbed to the desktop, the sealing performance between the suction cup and the desktop will decrease due to the uneven desktop or excessive dust, resulting in a decrease in the adsorption force of the suction cup on the desktop, and when the negative pressure value inside the suction cup decreases, the piston rod will be moved to the end away from the vacuum chamber by the elastic force of the spring, and the re-suction switch will rebound and start the vacuum pump, and apply negative pressure to the vacuum chamber, thereby avoiding the reduction of the pressure holding capacity of the locking component due to the low friction coefficient of the desktop during the measurement of the ophthalmic optical biometer, and ensuring that the negative pressure value in the vacuum chamber of the ophthalmic optical biometer is kept within the adsorption range during measurement.

[0017] Preferably, the anti-skid pad is made of anti-skid and wear-resistant material, including any one of rubber, silicone, polyurethane and polyvinyl chloride, among which the rubber material has good wear resistance and corrosion resistance, good shock absorption, is not easy to age, and is suitable for a variety of environments; silicone has good wear resistance and skid resistance, as well as good high temperature resistance and is not easy to deform; polyurethane material has wear resistance and corrosion resistance, good tensile resistance, high elasticity and is not easy to deform; polyvinyl chloride material has good wear resistance and skid resistance, as well as low cost and is easy to process and manufacture.

[0018] Compared with the prior art, the present invention has the following beneficial effects:

[0019] 1. The present invention arranges a fixing component and a locking component on the biometer. When the biometer is in operation, the vacuum pump is started, and negative pressure is generated in a suction cup connected to the vacuum pump. When the negative pressure inside the suction cup reaches a set value, a locking valve between the vacuum pump and the suction cup will lock the negative pressure value inside the suction cup, thereby preventing the movable ophthalmic optical biometer from moving due to the pulling and shaking of children during the measurement process, resulting in a decrease in the stability of the ophthalmic optical biometer, and further causing the problem of deviation in the detection result, thereby ensuring the stability of the ophthalmic optical biometer during measurement.

[0020] 2. The present invention provides multiple protrusions on the lower end surfaces of multiple suction cups. When negative pressure is generated inside the suction cup, the adsorption airway transmits the negative pressure value to between the multiple protrusions. At this time, the distance between the suction cup and the desktop will shrink. At the same time, the multiple protrusions will support the suction cup and generate downward pressure on the desktop, thereby increasing the friction between the suction cup and the desktop, thereby avoiding the problem that the ophthalmic optical biometer is offset during the measurement process due to the small friction between the suction cup and the desktop, thereby causing the detection result of the ophthalmic optical biometer to deviate, thereby ensuring the stability of the ophthalmic optical biometer during measurement.

[0021] 3. The present invention further provides an anti-skid pad on the lower end surface of the base body. When negative pressure is generated inside the suction cup and it is adsorbed onto the desktop, the pressure of the anti-skid pad on the desktop will also increase. The wave-shaped design of the anti-skid pattern can enhance the friction between the anti-skid pad and the desktop, thereby ensuring the stability of the ophthalmic optical biometer during measurement. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a structural schematic diagram of the self-locking lower base for the biometer of the present invention;

[0023] Figure 2 For the present invention Figure 1 Sectional view at AA in the middle;

[0024] Figure 3 It is a structural schematic diagram of the biometer of the present invention after the piston rod in the self-locking lower base drives the locking block to lock the air pressure inside the vacuum chamber;

[0025] Figure 4 For the present invention Figure 2 The cross-sectional view at BB in FIG.

[0026] Figure 5 It is a schematic diagram of the structure of the locking valve and the releasing valve in the self-locking lower base for the biometer of the present invention;

[0027] Figure 6 For the present invention Figure 5 Cross-sectional view at CC in FIG.

[0028] Figure 7 It is a schematic diagram of the structure of the biometer of the present invention after the locking block in the self-locking lower base triggers the re-absorption switch to turn off the vacuum pump;

[0029] Figure 8 It is a schematic diagram of the structure of the suction cup and the anti-skid pad in the self-locking lower base for the biometer of the present invention;

[0030] In the figure: 1. base body; 2. vacuum pump; 3. suction cup; 401. vacuum chamber; 402. vacuum chamber; 403. pipeline; 404. anti-skid pad; 405. locking valve; 406. release valve; 407. piston cylinder; 408. partition; 409. piston rod; 410. locking block; 411. spring; 412. slide groove; 413. piston chamber; 414. locking groove; 415. air outlet; 416. air inlet; 417. protrusion; 418. adsorption airway; 501. anti-skid pattern; 502. re-suction switch; 503. movable block; 504. electromagnetic switch. DETAILED DESCRIPTION

[0031] See also Figures 1 to 8 The present invention provides a self-locking lower base for a biometric meter, and the technical solution is as follows:

[0032] A self-locking lower base for a biometric meter comprises a base body 1, a fixing assembly and a locking assembly are mounted on the base body 1, a vacuum pump 2 and a suction cup 3 are arranged on the fixing assembly, the vacuum pump 2 is mounted on the upper end surface of the base body 1, the suction cup 3 is mounted on the lower end surface of the base body 1, an anti-skid pad 404 is further arranged on the lower end surface of the base body 1, the lower end surface of the anti-skid pad 404 is flush with the lower end surface of the suction cup 3, an anti-skid pattern 501 is arranged on the lower end surface of the anti-skid pad 404, and the contact surface of the anti-skid pattern 501 with the desktop is wavy, the vacuum pump 2 and the suction cup 3 are connected through a pipeline 403, a locking valve 405 is arranged on the locking assembly, the locking valve 405 is mounted between the vacuum pump 2 and the suction cup 3, and the locking valve 405 locks the adsorption pressure after the suction cup 3 is adsorbed.

[0033] The fixing assembly includes a vacuum pump 2, a suction cup 3 and a vacuum chamber 401. The vacuum chamber 401 is installed on the upper end surface of the bottom plate body. A vacuum chamber 402 is provided in the vacuum chamber 401. The vacuum chamber 402 is connected to the vacuum pump 2 through a pipe 403. The number of suction cups 3 is 4. The plurality of suction cups 3 are respectively located at the four angles of the base body 1. The contact surfaces of the plurality of suction cups 3 and the desktop are L-shaped. The angle of the L-shape is the same as the angle of the side of the base body 1. The plurality of suction cups 3 are connected to the vacuum chamber 402 through the pipe 403. The lower end surfaces of the plurality of suction cups 3 are provided with a plurality of protrusions 417. The circumference of 417 is evenly distributed on the outer circle of the suction cup 3, and a suction air channel 418 is provided between the plurality of protrusions 417. The suction air channel 418 is connected to the vacuum chamber 402 through the pipeline 403. When the vacuum pump 2 is started, negative pressure is generated in the vacuum chamber 402 connected to the vacuum pump 2 and the suction cup 3, and the suction cup 3 adsorbs the ophthalmic optical biometer on the desktop. The plurality of suction cups 3 are respectively located at the four angles of the base body 1, thereby avoiding the problem of error in the measurement result caused by uneven force on the suction cup 3 during the measurement of the ophthalmic optical biometer, thereby ensuring the stability of the ophthalmic optical biometer during measurement.

[0034] The locking assembly includes a locking valve 405 and a release valve 406. The locking valve 405 also includes a piston cylinder 407, a partition 408, a piston rod 409, a locking block 410 and a spring 411. The piston cylinder 407 is installed on the front end surface of the vacuum chamber 401. The partition 408 is installed in the middle of the piston cylinder 407. The partition 408 is coaxially provided with a slide groove 412. The piston rod 409 is coaxially slidably connected in the slide groove 412. A piston cavity 413 is also provided in the piston cylinder 407. The piston cavity 413 is located at the rear side of the piston rod 409. The piston cavity 413 is connected to the vacuum chamber 402. The locking block 410 is installed on the front end surface of the piston rod 409. The spring 411 is sleeved on the piston rod 409, and the two ends of the spring 411 are respectively connected to the front end surface of the partition 408 and the rear end surface of the locking block 410. The side of the piston cylinder 407 is also provided with a locking groove 414. The locking block 410 is slidably connected to the It is connected in the locking groove 414, and the two ends of the locking groove 414 are respectively connected to the vacuum pump 2 and the vacuum chamber 402. An air outlet 415 is provided at the connection between the locking groove 414 and the vacuum pump 2. The backward movement of the locking block 410 can cut off the connection between the vacuum pump 2 and the vacuum chamber 402. The release valve 406 is installed on the upper end surface of the piston cylinder 407. An air inlet 416 and an electromagnetic switch 504 are provided in the release valve 406. The two ends of the air inlet 416 are respectively connected to the locking groove 414 and the outside of the release valve 406. The electromagnetic switch 504 is installed between the locking groove 414 and the air inlet 416. A re-absorption switch 502 is also provided on the piston cylinder 407. The lower end of the re-absorption switch 502 is installed on the rear end of the locking groove 414. A movable block 503 is slidably connected in the re-absorption switch. The lower end of the movable block 503 extends into the locking groove 414, and the movable block 503 is located on the rear side of the locking block 410.

[0035] While working, see Figures 1 to 8, the ophthalmic optical biometer is located on the desktop, and the suction cup 3 in contact with the desktop will be in a closed state. When the ophthalmic optical biometer is operating, the reset switch is in an on state, and the vacuum pump 2 will be started, and the electromagnetic switch 504 will also be energized, and the connection between the locking groove 414 and the air inlet 416 will be cut off. When the vacuum pump 2 is running, negative pressure is generated in the vacuum chamber 402 and the suction cup 3 connected to the vacuum pump 2. Further, the suction cup 3 adsorbs the ophthalmic optical biometer on the desktop, and because the multiple suction cups 3 are respectively located at the four angles of the base body 1, the ophthalmic optical biometer is prevented from being unevenly stressed by the suction cup 3 during the measurement process. At the same time, the negative pressure generated inside the suction cup 3 will transmit the negative pressure value to the multiple protrusions 41 through the adsorption airway 418. 7, as the negative pressure in the suction cup 3 gradually increases, the internal space of the suction cup 3 is continuously reduced, so that the distance between the suction cup 3 and the desktop becomes smaller. At this time, the multiple protrusions 417 inside the suction cup 3 will play a supporting role. The protrusions 417 will generate downward pressure on the desktop, thereby increasing the friction between the suction cup 3 and the desktop, and the L-shaped contact surface between the suction cup 3 and the desktop increases the contact surface between the suction cup 3 and the desktop, and the setting of the L-shaped contact surface makes the force on the side of the ophthalmic optical biometer more balanced. When negative pressure is generated inside the suction cup 3 and adsorbed to the desktop, the pressure of the anti-skid pad 404 on the desktop will also increase. At the same time, the wavy design of the anti-skid pattern 501 can also increase the friction between the anti-skid pad 404 and the desktop, so that the connection between the ophthalmic optical biometer and the desktop is more secure.

[0036] Furthermore, when the negative pressure inside the vacuum chamber 402 gradually increases, the negative pressure in the piston chamber 413 connected to the vacuum chamber 402 also gradually increases. At this time, the piston rod 409 is pressed to move toward the vacuum chamber 402. During the movement of the piston rod 409, the locking block 410 is driven to move toward the partition 408. At this time, the spring 411 in the piston chamber 413 will be compressed, and the locking block 410 will slide in the locking groove 414. When the locking block 410 gradually moves to the position of the air outlet 415, the air outlet 415 will gradually decrease. When the locking block 410 moves to the locking groove 414 close to the wall of the vacuum chamber 401, the air outlet 415 will no longer be able to pass through the gas. At this time, the air pressure inside the vacuum chamber 402 will be maintained at the same pressure, avoiding the air pressure in the vacuum chamber 402. The change causes the adsorption force to decrease. When the locking block 410 cuts off the air outlet 415, it will contact the re-suction switch 502. At this time, the vacuum pump 2 will stop working. When the suction cup 3 is adsorbed to the desktop, due to the uneven desktop or excessive dust, the sealing between the suction cup 3 and the desktop will decrease, resulting in a decrease in the adsorption force of the suction cup 3 on the desktop. When the negative pressure value inside the suction cup 3 decreases, the piston rod 409 will be moved to the end away from the vacuum chamber 401 by the elastic force of the spring 411. At this time, the re-suction switch 502 will rebound and start the vacuum pump 2, and apply negative pressure to the vacuum chamber 402, thereby avoiding the reduction of the pressure holding capacity of the locking component due to the low friction coefficient of the desktop during the measurement of the ophthalmic optical biometer, and ensuring that the negative pressure value in the vacuum chamber 402 of the ophthalmic optical biometer is kept within the adsorption range during measurement.

[0037] A specific embodiment of the present invention is described in detail above in conjunction with the accompanying drawings, but the present invention is not limited to the above described embodiment. For those skilled in the art, various changes, modifications, substitutions and variations of these embodiments without departing from the principles and ideas of the present invention should still fall within the scope of protection of the present invention.

Claims

1. A self-locking lower base for a biometric instrument, comprising a base body (1), characterized in that: The base body (1) is provided with a fixing component and a locking component, the fixing component is provided with a vacuum pump (2) and a suction cup (3), the vacuum pump (2) is mounted on the upper end surface of the base body (1), the suction cup (3) is mounted on the lower end surface of the base body (1), the vacuum pump (2) and the suction cup (3) are connected via a pipe (403), the locking component is provided with a locking valve (405), the locking valve (405) is mounted between the vacuum pump (2) and the suction cup (3), and when the suction cup (3) is adsorbed, the locking valve (405) locks the adsorption pressure.

2. A self-locking lower base for a biometric meter according to claim 1, characterized in that: The fixing assembly comprises a vacuum pump (2), a suction cup (3) and a vacuum chamber (401); the vacuum chamber (401) is mounted on the upper end surface of the base body; a vacuum chamber (402) is provided in the vacuum chamber (401); the vacuum chamber (402) is connected to the vacuum pump (2) via a pipe (403); the number of the suction cups (3) is four; the plurality of suction cups (3) are respectively located at four angles of the base body (1); and the plurality of suction cups (3) are all connected to the vacuum chamber (402) via the pipe (403).

3. A self-locking lower base for a biometric meter according to claim 2, characterized in that: The locking assembly comprises a locking valve (405) and a release valve (406). The locking valve (405) further comprises a piston cylinder (407), a partition (408), a piston rod (409), a locking block (410) and a spring (411). The piston cylinder (407) is installed on the front end surface of the vacuum chamber (401). The partition (408) is installed in the middle of the piston cylinder (407). The partition (408) is coaxially provided with a slide groove (412). The plug rod (409) is coaxially slidably connected in the slide groove (412), and a piston chamber (413) is also provided in the piston cylinder (407). The piston chamber (413) is located at the rear side of the piston rod (409), and the piston chamber (413) is connected to the vacuum chamber (402). The locking block (410) is installed on the front end surface of the piston rod (409), and the spring (411) is sleeved on the piston rod (409), and the two ends of the spring (411) are respectively connected to the piston rod (409). The front end surface of the partition (408) is connected to the rear end surface of the locking block (410), and a locking groove (414) is also provided on the side of the piston cylinder (407). The locking block (410) is slidably connected in the locking groove (414). The two ends of the locking groove (414) are respectively connected to the vacuum pump (2) and the vacuum chamber (402). An air outlet (415) is provided at the connection between the locking groove (414) and the vacuum pump (2). The locking block (410) is slidably connected to the locking groove (414). The rear movement can cut off the connection between the vacuum pump (2) and the vacuum chamber (402). The release valve (406) is installed on the upper end surface of the piston cylinder (407). An air inlet (416) and an electromagnetic switch (504) are provided in the release valve (406). The two ends of the air inlet (416) are respectively connected to the locking groove (414) and the outside of the release valve (406). The electromagnetic switch (504) is installed between the locking groove (414) and the air inlet (416).

4. A self-locking lower base for a biometric meter according to claim 2, characterized in that: A plurality of protrusions (417) are arranged on the lower end surfaces of the plurality of suction cups (3), and the plurality of protrusions (417) are evenly distributed on the outer ring of the suction cup (3). An adsorption air channel (418) is arranged between the plurality of protrusions (417), and the adsorption air channel (418) is connected to the vacuum chamber (402) through a pipe (403).

5. A self-locking lower base for a biometric meter according to claim 4, characterized in that: The contact surfaces between the plurality of suction cups (3) and the desktop are in an L-shape, and the included angle of the L-shape is the same as the included angle of the side of the base body (1).

6. A self-locking lower base for a biometric meter according to claim 5, characterized in that: The lower end surface of the base body (1) is also provided with an anti-skid pad (404), the lower end surface of the anti-skid pad (404) is flush with the lower end surface of the suction cup (3), and the lower end surface of the anti-skid pad (404) is provided with an anti-skid pattern (501), and the contact surface between the anti-skid pattern (501) and the desktop is wavy.

7. A self-locking lower base for a biometric meter according to claim 3, characterized in that: The piston cylinder (407) is provided with a re-inhalation switch (502), the lower end of which is mounted on the rear end of the locking groove (414), and a movable block (503) is slidably connected inside the re-inhalation switch, the lower end of which extends into the locking groove (414), and the movable block (503) is located at the rear side of the locking block (410).

8. The self-locking lower base for a biometric meter according to claim 6, characterized in that: The anti-skid pad (404) is made of anti-skid and wear-resistant material, including any one of rubber, silicone, polyurethane and polyvinyl chloride.

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