Suction head pressing device and pipettor

Abstract

The utility model relates to the field of pipettors, solves the problems that the occupied area of a deep hole plate and the distance between adjacent gun heads on an existing pipettor need to be increased in order to avoid the situation that an assembled suction head takes up an unassembled suction head, and provides a suction head pressing and taking device which comprises a suction head removing block, a suction head pressing plate and a first elastic piece, and the suction head removing block is provided with a through hole; the suction head pressing plate is movably connected with the suction head removing block and has the limiting motion degree in the vertical direction, and the suction head pressing plate is provided with an open hole. And the first elastic piece is arranged between the suction head removing block and the suction head pressing plate. The first elastic piece is arranged between the suction head removing block and the suction head pressing block, when the pipettor moves downwards, the suction head pressing block abuts against the suction head on the deep hole plate, the suction head removing block drives the gun head to move downwards continuously till the gun head and the suction head are assembled, in the process, the spring is further compressed, and when the pipettor moves upwards, the suction head is removed. When the suction head is not assembled, the suction head pressing plate can apply downward force to the unassembled suction head, and the unassembled suction head is prevented from being taken up.

Description

TECHNICAL FIELD

[0001] The utility model relates to the pipette field, specifically, relate to a suction head pressure and take device and pipette. BACKGROUND

[0002] The pipette gun is one kind of pipette, is often used in laboratory small or trace amount of liquid and is taken, and different specifications of pipette gun are matched with different size gun head. It is more widely used in immunology, biochemistry, clinical diagnosis and food analysis etc. At present, the pipette needs to assemble the suction head in the gun head before sucking liquid, and the suction head is often placed on the deep hole plate, and in the process of assembling the gun head and the suction head, the suction head will be expanded to a certain extent because of the close fitting relationship between the gun head and the suction head. If the suction head contacts the surrounding suction head during the expansion process, the assembled suction head may drive the surrounding un-assembled suction head during the upward movement of the pipette. In order to avoid the occurrence of the foregoing problem, the spacing between the suction heads needs to be increased, thereby increasing the occupied area of the deep hole plate and the distance between the adjacent gun heads on the pipette. SUMMARY

[0003] The utility model discloses a suction head pressure and take device and pipette, solve the problem that the existing pipette needs to increase the occupied area of the deep hole plate and the distance between the adjacent gun heads on the pipette in order to avoid that the assembled suction head drives the un-assembled suction head.

[0004] The embodiment of the utility model realizes by the following technical scheme:

[0005] A suction head pressure and take device, comprising: suction head block, suction head pressing plate and first elastic piece, the suction head block is equipped with the through hole for the gun head to pass through, the suction head pressing plate is equipped below the suction head block, the suction head pressing plate is movably connected with the suction head block and has the limit activity degree in the vertical direction, the suction head pressing plate is equipped with the aperture for the gun head to pass through, the first elastic piece is equipped between the suction head block and the suction head pressing plate, when the relative displacement of the suction head block and the suction head pressing plate in the vertical direction occurs, the first elastic piece is in the compression state.

[0006] Preferably, the suction head pressing plate is equipped with the guide column, the suction head block is equipped with the guide hole, and the guide column is equipped in the guide hole.

[0007] Preferably, the guide column is provided with a threaded hole, the guide hole comprises: a large hole section and a small hole section, the large hole section is arranged away from the tip plate, the small hole section is in communication with the large hole section, and the small hole section is arranged close to the tip plate; the tip plate device further comprises: a screw, the shank of the screw passes through the small hole section and is threadedly connected with the guide column, the maximum outer diameter of the head of the screw is greater than the hole diameter of the small hole section, and the maximum outer diameter of the head of the screw is smaller than the hole diameter of the large hole section.

[0008] Preferably, the tip removing block or the tip plate is connected or abuts against the end of the first elastic member.

[0009] Preferably, the first elastic member is a spring, and the first elastic member and the guide rod are both two, the two first elastic members are oppositely arranged at two ends of the tip removing block, and each guide rod is arranged in the first elastic member.

[0010] A pipette comprises: a pipette main body and the tip plate device, the tip removing block is connected with the bottom end of the pipette main body, and the gun head on the pipette main body is arranged in the through hole.

[0011] Preferably, the pipette main body comprises: a containing seat, a gun head and a rotating shaft pressing rod, the containing seat is provided with a shaft hole, a hole wall of the shaft hole is provided with a plurality of containing grooves for containing the gun head along the length direction of the hole wall, a bottom wall of the containing groove is provided with a hole opening for the end of the gun head to pass through, and the bottom wall of the containing groove is provided with a second elastic member; the gun head is mounted in the containing groove, one end of the second elastic member away from the bottom wall of the containing groove is connected with the gun head; the rotating shaft pressing rod is arranged in the shaft hole and can rotate in the shaft hole, a plurality of folding grooves with different lengths are arranged on the rotating shaft pressing rod along the circumferential direction of the rotating shaft pressing rod, and the gun heads accommodated in the folding grooves with different lengths are different in number.

[0012] Preferably, the plurality of folding grooves are arranged in the middle part of the length direction of the rotating shaft pressing rod.

[0013] Preferably, the plurality of folding grooves gradually increase or decrease in length in the process of being arranged along the circumferential direction of the rotating shaft pressing rod.

[0014] Preferably, adjacent folding grooves are in communication with each other in the width direction, and the rotating shaft pressing rod at least has a non-groove area for pressing all the gun heads.

[0015] The pipette has at least the following beneficial effects:

[0016] The utility model discloses a first elastic piece is arranged between the suction head block and suction head briquetting, when the pipettor is down, and the suction head pressure plate and the suction head on deep hole plate abut, and the suction head block is with the gun head continuous down, until the gun head and suction head assembly are completed, in this process, spring will be further compressed, when the pipettor is up, and the suction head pressure plate will exert a downward force to the suction head of not assembling, avoids the suction head of not assembling and being taken up, after adopting the suction head pressure and take device provided by the utility model, do not have to deliberately increase the distance between the adjacent suction head, and then reduce the occupation area of deep hole plate and the distance between the gun head on pipettor. BRIEF DESCRIPTION OF DRAWINGS

[0017] In order to more clearly illustrate the technical scheme of the embodiment of the utility model, the following will be briefly introduced to the drawing needed in the embodiment, it should be understood that the following drawings only show some embodiments of the utility model, therefore should not be regarded as the limitation to the range, for the ordinary skilled person in the art, under the premise of not paying the creative labor, still can obtain other related drawings according to these drawings.

[0018] Figure 1 It is the explosion view of suction head pressure and take device;

[0019] Figure 2 It is the structure schematic drawing of suction head pressure and take device;

[0020] Figure 3 It is the sectional view of suction head pressure and take device;

[0021] Figure 4 It is the structure schematic drawing of pipettor;

[0022] Figure 5 It is the structure schematic drawing of pipettor main body;

[0023] Figure 6 It is the sectional view of pipettor main body;

[0024] Figure 7 It is the first layout of stowage groove;

[0025] Figure 8 It is the second layout of stowage groove;

[0026] Figure 9 It is the third layout of stowage groove;

[0027] Figure 10 It is the fourth layout of stowage groove;

[0028] Figure 11 It is the fifth layout of stowage groove;

[0029] Icons: 1-Pipe head block, 11-Through hole, 12-Guide hole, 121-Large hole section, 122-Small hole section, 2-Pipe head pressure plate, 21-Opening, 22-Guide post, 3-First elastic element, 4-Screw, 5-Pipe body, 51-Receiving seat, 511-Shaft hole, 5111-Receiving groove, 5112-Orifice, 6-Second elastic element, 7-Pipe head, 71-Insert section, 72-Limiting section, 8-Rotating shaft pressure rod, 81-Retraction groove, 82-Non-groove area, 83-Working section, 84-Connecting section, 9-Bearing, 10-Motor, 01-Deep hole plate, 02-Pipe head. Detailed Implementation

[0030] To make the objectives, methods, and advantages of the embodiments of this utility model clearer, the methods in the embodiments of this utility model will be clearly and completely described. Obviously, the described embodiments are some embodiments of this utility model, but not all embodiments.

[0031] Example 1: As Figures 1-3 As shown, a suction head pressing device includes: a suction head removal block 1, a suction head pressing plate 2, and a first elastic member 3. The suction head removal block 1 has a through hole 11 for the nozzle 7 to pass through. The suction head pressing plate 2 is located below the suction head removal block 1, and is movably connected to the suction head removal block 1 and has a vertically limited range of motion. The suction head pressing plate 2 has an opening 21 for the nozzle 7 to pass through. The first elastic member 3 is located between the suction head removal block 1 and the suction head pressing plate 2. When the suction head removal block 1 and the suction head pressing plate 2 undergo relative vertical displacement, the first elastic member 3 is in a compressed state.

[0032] In practical implementation, the limited range of motion refers to the vertical movement of the suction head plate 2, but the range of movement is restricted. The first elastic element 3 can be connected in various ways, such as... Figure 3 As shown, the top end of the first elastic element 3 is connected to the tip removal block 1, and the bottom end is used to abut against the tip pressing plate 2. Alternatively, the bottom end of the first elastic element 3 can be connected to the tip pressing plate 2, and the top end can be used to abut against the tip removal block 1. The top end of the first elastic element 3 can also be connected to the tip removal block 1, and the bottom end to the tip pressing plate 2. The first elastic element 3 can be made of spring, rubber, or silicone, etc. The tip pressing device can be assembled as a separate accessory of the pipette body 5, or the tip removal block 1 can be directly integrated with the outer shell of the pipette body 5, and then the tip pressing plate 2 and spring, etc., can be assembled to the tip removal block 1. The elastic coefficient of the first elastic element 3 should not be too large to avoid excessive rebound force of the first elastic element 3, which could cause the tip 02 to deform under pressure.

[0033] When using it, please refer to Figure 4As shown, after placing the suction head 02 on the deep well plate 01, the pipette is moved downward to drive the suction head removing block 1 and the suction head pressing plate 2 to move downward. When the suction head pressing plate 2 abuts against the end of the suction head 02, the pipette continues to move downward to drive the suction head removing block 1 and the gun head 7 to move downward together. At this time, the first elastic member 3 between the suction head removing block 1 and the suction head pressing plate 2 is gradually compressed until the gun head 7 is assembled with the suction head 02. Since the gun head 7 and the suction head 02 are in a tight fitting relationship, the suction head 02 will expand to a certain extent during the insertion of the gun head 7. If the distance between adjacent suction heads 02 is small, the assembled suction head 02 and the surrounding un-assembled suction heads 02 will be pressed against each other. At this time, the upward movement of the pipette makes the assembled suction head 02 move together with the pipette. Under the action of the elastic force of the first elastic member 3, the suction head pressing plate 2 will press down the un-assembled suction head 02 abutting against the suction head pressing plate 2, so as to avoid the un-assembled suction head 02 from being lifted by the assembled suction head 02. After the conventional pipette adopts the suction head pressing and taking device provided in the embodiment, the distance between adjacent suction heads 02 can be reduced to a certain extent, the occupied area of the deep well plate 01 can be reduced, and the distance between the gun heads 7 on the pipette can also be reduced, thereby significantly reducing the economic cost.

[0034] In order to increase the stability of the movement of the suction head pressing plate 2, the embodiment 2 is improved on the basis of the embodiment 1, as shown in Figure 1 or Figure 3 In the embodiment, the suction head pressing plate 2 is provided with a guide column 22, the suction head removing block 1 is provided with a guide hole 12, and the guide column 22 penetrates the guide hole 12.

[0035] In the specific implementation process, the limitation of the guide column 22 and the guide hole 12 can reduce the shaking of the suction head pressing plate 2 during the movement. In addition, a stop block can be arranged at the end of the guide column 22. The stop block cannot penetrate the guide hole 12, and the guide column 22 is prevented from being completely removed from the guide hole 12 by the stop block.

[0036] In order to facilitate the installation of the suction head pressing plate 2 and limit the movement of the suction head pressing plate 2, the embodiment 3 is improved on the basis of the embodiment 2, as shown in Figure 3 In the embodiment, the guide column 22 is provided with a threaded hole, the guide hole 12 includes a large hole section 121 and a small hole section 122, the large hole section 121 is arranged away from the suction head pressing plate 2, the small hole section 122 is in communication with the large hole section 121, and the small hole section 122 is arranged close to the suction head pressing plate 2. The suction head pressing and taking device further includes a screw 4, the shank of the screw 4 penetrates the small hole section 122 and is threadedly connected with the guide column 22, the maximum outer diameter of the head of the screw 4 is greater than the hole diameter of the small hole section 122, and the maximum outer diameter of the head of the screw 4 is less than the hole diameter of the large hole section 121.

[0037] In the implementation process, the cooperation of the guide column 22 and the screw 4 can not only simply realize the assembly and disassembly of the suction head block 1 and the suction head pressing plate 2, but also limit the maximum distance of the relative displacement between the suction head block 1 and the suction head pressing plate 2 through the cooperation of the head of the screw 4 and the guide hole 12. After the installation of the screw 4 is completed, the distance between the suction head block 1 and the suction head pressing plate 2 can satisfy that the first elastic member 3 is in a compressed state. The diameter of the small hole section 122 in the guide hole 12 can be as close as possible to the shank of the screw 4, so as to reduce the horizontal shaking of the screw 4.

[0038] In the embodiment, the suction head block 1 or the suction head pressing plate 2 is connected or abuts against the end of the first elastic member 3.

[0039] In the implementation process, as shown in Figure 1 , the top end of the first elastic member 3 is connected with the suction head block 1, so that the first elastic member 3 can not be affected by the gravity of the suction head pressing plate 2 when the two ends of the first elastic member 3 are connected with the suction head block 1 and the suction head pressing plate 2 respectively. In addition, the fixed connection of only one end of the first elastic member 3 is beneficial to the disassembly between the suction head pressing plate 2 and the suction head block 1.

[0040] As shown in Figure 3 , the top end of the first elastic member 3 can be connected with the end of the large hole section 121, and the limitation of the large hole section 121 can reduce the bending of the first elastic member 3.

[0041] In order to further reduce the bending of the first elastic member 3, the embodiment 5 is improved on the basis of the embodiment 4, as shown in Figures 1-3 , in the embodiment, the first elastic member 3 is a spring, and the first elastic member 3 and the guide rod are both two, the two first elastic members 3 are oppositely arranged at the two ends of the suction head block 1, and each guide rod is arranged in one first elastic member 3.

[0042] In the implementation process, after the assembly of the suction head 02 is completed, the interaction force between the suction head pressing plate 2 and the unassembled suction head 02 in the upward movement of the pipette is not necessarily symmetrical relative to the two ends of the suction head pressing plate 2, so that the spring may be bent after the spring is compressed under the stress of the suction head pressing plate 2. Therefore, the guide column 22 passes through the spring in the embodiment, so that the bending of the spring can be limited by the guide column 22. The opposite arrangement of the two springs at the two ends of the suction head block 1 can also make the stress of the suction head pressing plate 2 more uniform.

[0043] The embodiment 6 provides a pipette, as shown in Figure 4 , comprising a pipette body 5 and the suction head pressing device, the suction head block 1 is connected with the bottom end of the pipette body 5, and the gun head 7 on the pipette body 5 is arranged in the through hole 11.

[0044] In the implementation process, Figure 4 The movement structure of the pipette body 5 is also shown in the figure, which is not the main body improved in the embodiment, so it is not described in detail. The tip removal block 1 can be connected to the bottom end of the pipette body 5 by screws or bolts, and screw holes matched with the screws or bolts can be provided on the pipette body 5 and the tip removal block 1. During the connection process, the gun head 7 passes through the through hole 11. After the tip pressing device is assembled on the conventional pipette, the un-assembled tip 02 can be prevented from being lifted by the assembled tip 02.

[0045] In order to realize the regulation of the number of gun heads 7, the embodiment 6 is improved as shown in the figure. Figures 5-6 In the embodiment, the pipette body 5 includes a receiving seat 51, a gun head 7, and a rotating shaft pressing rod 8. The receiving seat 51 is provided with a shaft hole 511, and the hole wall of the shaft hole 511 is provided with a plurality of receiving grooves 5111 for accommodating the gun head 7 along the length direction of the shaft hole 511. The bottom wall of the receiving groove 5111 is provided with a hole 5112 for the end of the gun head 7 to pass through, and the bottom wall of the receiving groove 5111 is provided with a second elastic element 6. The gun head 7 is installed in the receiving groove 5111, and the end of the second elastic element 6 away from the bottom wall of the receiving groove 5111 is connected with the gun head 7. The rotating shaft pressing rod 8 is arranged in the shaft hole 511 and can rotate in the shaft hole 511. The rotating shaft pressing rod 8 is provided with a plurality of different lengths of folding grooves 81 along the circumference, and the different lengths of folding grooves 81 can accommodate different numbers of gun heads 7.

[0046] In the implementation process, the second elastic element 6 can be a spring, rubber, or silicone. The connection relationship between the second elastic element 6 and the gun head 7 can be fixed connection or abutment. The second elastic element 6 can transmit the elastic force to the gun head 7 and move the gun head 7. The driving of the rotating shaft pressing rod 8 can be as shown in the figure. A motor 10 is arranged on the top of the receiving seat 51. The output shaft of the motor 10 is connected with a driving gear. A driven gear is arranged on the end of the rotating shaft pressing rod 8. The driving gear and the driven gear are in transmission connection. The rotating motor 10 can drive the rotating shaft pressing rod 8 to rotate. The width of the folding groove 81 can be matched with the gun head 7 as shown in the figure. In order to increase the stability of the gun head 7 during movement, a sliding block can be arranged on the side wall of the gun head 7, and a sliding rail matched with the sliding block can be arranged on the groove wall of the receiving groove 5111. Figure 6 Figure 5 As shown in the figure, a hose joint can be arranged on the back of each gun head 7. The number and length of the folding grooves 81 can be set according to the number of gun heads 7 to be regulated and the width of the gun head 7, etc. The embodiment is not specifically limited.

[0047] As shown in the figure, Figure 6 ​As shown, when only two gun heads 7 are needed, the rotating shaft pressing rod 8 is rotated, so that the storage groove 81 capable of accommodating six gun heads 7 is turned to the upper side of the gun head 7, and the gun head 7 enters the storage groove 81 under the rebounding action of the second elastic member 6. At this time, as shown Figure 6 As shown, only two gun heads 7 are pressed down by the rotating shaft pressing rod 8, and then the pipette is moved to the corresponding position on the deep-well plate 01, and the suction head 02 is placed on the deep-well plate 01. After the pipette is pressed down, the assembly of the gun head 7 and the suction head 02 can be achieved, and since only two gun heads 7 protrude downward, only two gun heads 7 and the suction head 02 are assembled during the downward movement of the pipette, so that the waste of the disposable suction head 02 can be avoided, and finally the liquid can be taken according to the conventional operation.

[0048] As shown, Figure 6 The gun head 7 can include an insertion section 71 and a limiting section 72. The insertion section 71 is inserted into the spring, and the end of the insertion section 71 can pass through the through hole 11. The limiting section 72 is connected to the end of the insertion section 71 away from the orifice 5112, and the limiting section 72 is located above the spring. The orthographic projection of the limiting section 72 towards the orifice 5112 is at least partially located outside the surrounding area of the spring. The cross section of the limiting section 72 can be circular, and the diameter of the maximum cross section of the limiting section 72 is greater than the diameter of the spring, so that the limiting section 72 cannot enter the surrounding space of the spring. During the downward pressing of the gun head 7, the end of the limiting section 72 presses the spring, and during the rebounding of the gun head 7, the rebounding force of the spring also directly acts on the end of the limiting section 72. The end of the limiting section 72 away from the insertion section 71 can be spherical. During the process of the gun head 7 entering another storage groove 81 from one storage groove 81, in order to reduce the resistance or even the jamming of the gun head 7 during the sliding process along the groove wall of the storage groove 81.

[0049] As shown, Figure 6 The rotating shaft pressing rod 8 can include a working section 83 and a connecting section 84. The storage groove 81 is arranged on the working section 83. The two ends of the working section 83 are respectively connected to one connecting section 84. The diameter of the connecting section 84 is smaller than that of the working section 83. The bearing 9 is arranged on the connecting section 84. The inner ring of the bearing 9 is connected to the working section 83, and the outer ring of the bearing 9 is connected to the accommodating seat 51. The installation of the rotating shaft pressing rod 8 through the bearing 9 can increase the rotation stability of the rotating shaft pressing rod 8. As shown, Figure 6 The diameter of the connecting section 84 is smaller than that of the working section 83, so that the end of the working section 83 can limit the bearing 9 on the side close to the working section 83, and a retaining ring can also be arranged on the side of the bearing 9 away from the working section 83, so as to further improve the limiting effect. In addition, a groove capable of embedding the outer ring of the bearing 9 can be arranged on the hole wall of the shaft hole 511, so as to facilitate the installation and fixation of the outer ring of the bearing 9.

[0050] In order to further increase the uniformity of the stress on both ends of the suction head pressing plate 2, the embodiment 7 is improved, as shown in Figures 7-8As shown, in the embodiment, several of the stowage grooves 81 are arranged at the middle of the length direction of the rotating shaft pressing rod 8.

[0051] In the implementation process, the structure of the stowage groove 81 can be as shown in Figure 7 As shown, a plurality of gun heads 7 can be accommodated in one groove body, or as shown in Figure 8 As shown, one stowage groove 81 is composed of a plurality of transversely arranged sub-grooves, each of which accommodates one gun head 7. Taking 8 gun heads 7 as an example, when the stowage groove 81 directly above the gun head 7 has two sub-grooves, only two gun heads 7 are stowed, and thus 6 gun heads 7 are enabled. Adjacent stowage grooves 81 can be as shown in Figure 7 or Figure 9 As shown, they are connected to each other, or as shown in Figure 8 There is a certain interval in the width direction.

[0052] When adjacent stowage grooves 81 are connected to each other, during the switching of the number of gun heads 7, the back-and-forth movement of some or all of the gun heads 7 does not occur, and the rotation angle of the rotating shaft pressing rod 8 is smaller. As an example, the number of enabled gun heads 7 is changed from two to four. If, as shown in Figure 8 there is an interval between the stowage grooves 81, during the rotation of the rotating shaft pressing rod 8, the gun head 7 is first pressed down by the rotating shaft pressing rod 8 and then stowed under the action of the elastic force of the elastic member. During the rotation process, the more stowage grooves 81 the gun head 7 passes through, the more times the gun head 7 reciprocates, and thus the wear of the second elastic member 6 increases, and it needs to be replaced frequently. In addition, the angle of rotation of the rotating shaft pressing rod 8 increases each time the number of gun heads 7 is adjusted, and the operation is not convenient. In order to solve the above problems, adjacent stowage grooves 81 can be connected to each other.

[0053] Since in actual use, 8 guns or 16 guns are mainly used, and the rest of the number of gun heads 7 is auxiliary, in order to more easily adjust the gun heads 7 of the pipette device to the state of all being enabled, the arrangement mode of the stowage groove 81 as shown in Figure 8 can be used. After enabling the state of using only part of the gun heads 7, the interval on both sides of the stowage groove 81 accommodating the gun head 7 can be directly used to switch to the state of all gun heads 7 being enabled, and the operation is more simple.

[0054] If the arrangement mode of the stowage groove 81 as shown in Figure 9 is used, the number of un-assembled suction heads 02 acting on both sides of the suction head pressing plate 2 is different during the rebounding process of the suction head pressing plate 2 under the action of the first elastic member 3, which can cause the suction head pressing plate 2 to be deflected to a certain extent. Therefore, in order to better balance the stress of the suction head pressing plate 2, the present embodiment limits the setting position of the stowage groove 81, which can be referred to as shown in Figure 7 or Figure 8As shown in the figure, when the number of gun heads 7 is even, the number of gun heads 7 accommodated by each storage groove 81 in turn is 2, 4, 6, 8, …, and when the number of gun heads 7 is odd, the number of gun heads 7 accommodated by each storage groove 81 in turn is 1, 3, 5, 7, …, of course, in order to ensure that the force on both ends of the suction head pressing plate 2 is as uniform as possible, and to realize the continuity of the number of gun heads 7, the storage grooves 81 can also be arranged in the form of Figure 10 or Figure 11 As shown in the figure, the center positions of the storage grooves 81 are as uniform as possible.

[0055] Example 9: In order to better control the number of gun heads 7, the embodiment is improved on the basis of example 8, as shown in the figure, Figures 7-8 In this embodiment, the lengths of the storage grooves 81 gradually increase or decrease during the arrangement along the circumferential direction of the rotating shaft pressing rod 8.

[0056] In the specific implementation process, the storage grooves 81 are arranged in order according to the length, and the program is simpler when setting the control logic. In addition, when the adjacent storage grooves 81 are communicated with each other as shown in the figure, Figure 7 if the storage grooves 81 are not arranged in order according to the length, some or certain gun heads 7 may move back and forth repeatedly during the switching process of the number of gun heads 7 in use, which increases the loss of the second elastic member 6.

[0057] Example 10: In order to reduce the loss of the second elastic member 6, the embodiment is improved on the basis of examples 7-9, as shown in the figure, Figure 7 In this embodiment, the adjacent storage grooves 81 are communicated with each other in the width direction, and the rotating shaft pressing rod 8 has at least one non-groove area 82, which is used to press all the gun heads 7.

[0058] In the specific implementation process, the non-groove area 82 refers to a part of the arc surface area of the rotating shaft pressing rod 8 in the circumferential direction, which is not provided with the storage groove 81, when this area is located directly above the gun heads 7, all the gun heads 7 are pressed by the rotating shaft pressing rod 8, and the full use of the gun heads 7 is realized. After the adjacent storage grooves 81 are communicated with each other, the state of a part of the gun heads 7 remains unchanged during the switching process of the number of gun heads 7 in use, and the state of the corresponding second elastic member 6 remains unchanged, thereby reducing the compression and rebound times of the second elastic member 6 during the process of controlling the number of gun heads 7 in use, and further reducing the loss of the second elastic member 6.

[0059] The preferred embodiments of the utility model are merely used for limiting the utility model, and the utility model can be changed and varied for the person skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the utility model shall be included in the protection scope of the utility model.

Claims

1. A suction head pressing device characterized by comprising: The application relates to a suction head pressing device, which comprises the following parts: a suction head removing block (1) provided with a through hole (11) for a gun head (7) to pass through; a suction head pressing plate (2) arranged below the suction head removing block (1), which is movably connected with the suction head removing block (1) and has a limited movable degree in the vertical direction, and the suction head pressing plate (2) is provided with an opening (21) for the gun head (7) to pass through; a first elastic member (3) arranged between the suction head removing block (1) and the suction head pressing plate (2), which is in a compressed state when the suction head removing block (1) and the suction head pressing plate (2) are relatively displaced in the vertical direction.

2. The suction head pressing device according to claim 1, characterized by The suction head pressing plate (2) is provided with a guide column (22), and the suction head removing block (1) is provided with a guide hole (12), and the guide column (22) is arranged in the guide hole (12).

3. The suction head pressing device according to claim 2, characterized in that The guide column (22) is provided with a threaded hole, and the guide hole (12) comprises: a large hole section (121) arranged away from the suction head pressing plate (2); a small hole section (122) in communication with the large hole section (121) and arranged close to the suction head pressing plate (2); The suction head pressing device further comprises: a screw (4), the shank of the screw (4) passes through the small hole section (122) and is threadedly connected with the guide column (22), the maximum outer diameter of the head of the screw (4) is larger than the hole diameter of the small hole section (122), and the maximum outer diameter of the head of the screw (4) is smaller than the hole diameter of the large hole section (121).

4. The suction head pressing device according to claim 2, characterized by The suction head removing block (1) or the suction head pressing plate (2) is connected with or abuts against the end of the first elastic member (3).

5. The suction head pressing device according to claim 4, characterized in that The first elastic member (3) is a spring, and the first elastic member (3) and the guide column (22) are both two, the two first elastic members (3) are oppositely arranged at the two ends of the suction head removing block (1), and each guide column (22) is arranged in one first elastic member (3).

6. A pipette, characterized in that The application relates to a suction head pressing device, which comprises the following parts: a pipette main body (5); the suction head pressing device according to any one of claims 1-5, the suction head removing block (1) is connected with the bottom end of the pipette main body (5), and the gun head (7) on the pipette main body (5) is arranged in the through hole (11).

7. The pipette of claim 6, wherein, The pipette main body (5) comprises: a containing seat (51) provided with a shaft hole (511), the hole wall of the shaft hole (511) is provided with a plurality of containing grooves (5111) for containing the gun head (7) along the length direction, the bottom wall of the containing groove (5111) is provided with a hole (5112) for the end of the gun head (7) to pass through, and the bottom wall of the containing groove (5111) is provided with a second elastic member (6); a gun head (7) mounted in the containing groove (5111), and the end of the second elastic member (6) away from the bottom wall of the containing groove (5111) is connected with the gun head (7); A rotating shaft pressing rod (8) is arranged in the shaft hole (511) and can rotate in the shaft hole (511), and the rotating shaft pressing rod (8) is provided with a plurality of folding grooves (81) with different lengths along the circumference of the rotating shaft pressing rod (8), and the number of gun heads (7) accommodated by the folding grooves (81) with different lengths is different.

8. The pipette of claim 7, wherein, The plurality of folding grooves (81) are arranged at the middle part of the length direction of the rotating shaft pressing rod (8).

9. The pipette of claim 8, wherein, The plurality of folding grooves (81) gradually increase or decrease in length during the arrangement along the circumference of the rotating shaft pressing rod (8).

10. The pipette according to any one of claims 7 to 9, characterized in that The adjacent folding grooves (81) are communicated with each other in the width direction, and the rotating shaft pressing rod (8) at least has a non-groove area (82) for pressing all the gun heads (7).

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