Pipettor, and self-locking type counting device thereof

Abstract

Embodiments of the present invention disclose a pipettor and a self-locking type counting device thereof. The self-locking type counting device comprises a counting assembly, an indexing wheel, an indexing arm, a first self-locking structure, and a second self-locking structure. The counting assembly comprises a first counting unit, and the first counting unit comprises a first number wheel which is rotatable. The indexing wheel rotates synchronously with the first number wheel. A first end of the indexing arm is fixed, and a second end of the indexing arm abuts against the indexing wheel. The first self-locking structure is located at a position where the indexing arm abuts against the indexing wheel, and is capable of limiting the rotation of the indexing wheel. The second self-locking structure is configured to fix the first end of the indexing arm. The pipettor and the self-locking type counting device thereof in the embodiments of the present invention can not only realize manual counting but also achieve self-locking after the counting is completed, thereby ensuring the accuracy of a counting result. In addition, during the counting, the counting assembly can easily overcome the limitations of the first self-locking structure and the second self-locking structure, so that it is easier for an operator to operate the pipettor.

Description

PIPETTOR, AND SELF-LOCKING TYPE COUNTING DEVICE THEREOFTechnical Field

[0001] The present invention belongs to the technical field of counting of pipettors, and particularly relates to a pipettor and a self-locking type counting device thereof.Background Art

[0002] Pipettors are primarily used for transferring and dispensing liquids, making them one of the most commonly used instruments in laboratories and also one of the instruments most likely to affect experimental results. Currently, the commonly used pipettors are manual pipettors, and the implementation principle of the pipettors is as follows: A piston stroke is changed by rotating a capacity regulating knob, and thus the pipetting capacity is adjusted. The piston stroke is correlated to a reading of a mechanical counting wheel by means of a mechanism. Since there is a corresponding relationship between the piston stroke and the capacity reading of the counting wheel, the reading of the counting wheel also changes correspondingly as the piston stroke changes.

[0003] At present, counting devices of the pipettors are classified into two categories: those with self-locking devices and those without. Manual pipettes without self-locking devices do not allow the transmission components inside the counting device to stop moving immediately after counting is completed, making it difficult to quickly adjust the counting device to the target value. The pipettors with the self-locking devices have complex structures and large self-locking forces, requiring operators to exert significant force to overcome the corresponding frictional forces, resulting in a poor hand feel when using the pipettors.

[0004] This information disclosed in the background art is merely intended to facilitate understanding of the general background of the present invention and should not be taken as an acknowledgment or any form of suggestion that the information constitutes the prior art already known to those of ordinary skill in the art.Summary of the Invention

[0005] An object of the present invention is to provide a pipettor and a self-locking type counting device thereof, the self-locking type counting device being capable of achieving manual counting and self-locking after completing the counting.

[0006] In order to achieve the above-mentioned object, the technical solution provided in a specific embodiment of the present invention is described below.

[0007] The self-locking type counting device comprises a counting assembly, an indexing wheel, an indexing arm, a first self-locking structure, and a second self-locking structure. The counting assembly comprises a first counting unit, and the first counting unit comprises a first number wheel which is rotatable. The indexing wheel rotates synchronously with the first number wheel. A first end of the indexing arm is fixed, and a second end of the indexing arm abuts against the indexing wheel. The first self-locking structure is located at a position where the indexing arm abuts against the indexing wheel, and is capable of limiting the rotation of the indexing wheel. The second self-locking structure is configured to fix the first end of the indexing arm.

[0008] In one or more embodiments of the present invention, the indexing arm comprises an indexing lever; the first self-locking structure comprises a first locking protrusion disposed at an end portion of the indexing lever, a plurality of second locking protrusions disposed on the indexing wheel in an encircling manner, and locking grooves disposed among adjacent second locking protrusions; and the self-locking type counting device has a counting state and a stationary state. In the counting state, the indexing wheel rotates, and the first locking protrusion abuts against the second locking protrusion and the locking groove alternately. In the stationary state, the indexing wheel is stationary, and the first locking protrusion abuts against the locking groove.

[0009] In one or more embodiments of the present invention, the self-locking type counting device further has an intermediate state, and the indexing wheel has a tendency to become stationary in the intermediate state. the self-locking type counting device further comprises a guide structure, and the guide structure is configured to guide the first locking protrusion into the locking groove in the intermediate state, thereby causing the self-locking type counting device to transition from the intermediate state to the stationary state. The guide structure comprises a first cambered surface disposed at an end surface of the first locking protrusion, and second cambered surfaces disposed at end surfaces of the second locking protrusions.

[0010] In one or more embodiments of the present invention, the first cambered surface has an arc radius of 0.5-1.5 mm.

[0011] In one or more embodiments of the present invention, a third cambered surface is disposed on one side and / or two sides of the indexing lever, the bending direction of the third cambered surface is opposite to the direction of the first cambered surface, and the third cambered surface has an arc radius of 3-4 mm.

[0012] In one or more embodiments of the present invention, the indexing arm further comprises a mounting portion disposed at one end of the indexing arm, the indexing lever is fixed on or integrally formed with the mounting portion, the second self-locking structure comprises a limiting block and an abutting block fixed on the mounting portion, the abutting block abuts against the limiting block, and the position of the limiting block is fixed.

[0013] In one or more embodiments of the present invention, the indexing arm is detachable.

[0014] In one or more embodiments of the present invention, an end surface of the abutting block abutting against the limiting block is arc-shaped, and the end surface has an arc radius of 0.5-1.5 mm.

[0015] In one or more embodiments of the present invention, an included angle exists between the abutting block and the indexing lever.

[0016] In one or more embodiments of the present invention, the first counting unit further comprises a first driving gear, a main driving gear and a first fixing shaft; the first driving gear, the first number wheel and the indexing wheel are coaxially mounted on the first fixing shaft and rotate synchronously, and the main driving gear is in meshed connection with the first driving gear.

[0017] In one or more embodiments of the present invention, the first counting unit further comprises a first carrying gear, the first carrying gear is mounted on the first fixing shaft and rotates synchronously with the first number wheel, and the first carrying gear is an incomplete gear. The counting assembly further comprises a third counting unit, one or more second counting units, a second fixing shaft and a plurality of transmission gears, the third counting unit is mounted on the first fixing shaft, and the third counting unit comprises a third number wheel and a third driving gear which rotate synchronously. The second counting unit is mounted on the first fixing shaft, the second counting unit comprises a second number wheel, a second driving gear and a second carrying gear which rotate synchronously, and the second carrying gear is an incomplete gear. The plurality of transmission gears are mounted on the second fixing shaft, the single transmission gear is meshed with the single third driving gear, and this transmission gear is also periodically meshed with the first carrying gear or the second carrying gear.

[0018] In one or more embodiments of the present invention, the mounting portion is mounted on the second fixing shaft.

[0019] A pipettor comprises a self-locking type counting device described above.

[0020] Compared with prior art, the pipettor and the self-locking type counting device thereof in the embodiments of the present invention can achieve manual counting and also achieve self-locking after completing the counting, thereby ensuring the accuracy of a counting result. In addition, during the counting, the counting assembly can easily overcome the limitations of the first self-locking structure and the second self-locking structure, so that it is easier for an operator to operate the pipettor.Brief Description of the Drawings

[0021] To describe the technical solutions in embodiments of the present invention or in the prior art more clearly, the following briefly introduces the accompanying drawings required for describing the embodiments or the prior art. Apparently, the accompanying drawings in the following description show merely some embodiments of the present invention, and a person of ordinary skill in the art may still derive other drawings from these accompanying drawings without creative efforts.

[0022] Fig. 1 is a schematic perspective structural diagram of a self-locking type counting device in an embodiment of the present invention;

[0023] Fig. 2 is a schematic planar structural diagram of the self-locking type counting device in the embodiment of the present invention;

[0024] Fig. 3 is a schematic structural diagram of the self-locking type counting device in a counting state in the embodiment of the present invention;

[0025] Fig. 4 is a schematic structural diagram of the self-locking type counting device in a stationary state in the embodiment of the present invention;

[0026] Fig. 5 is a schematic planar structural diagram of an indexing arm in the embodiment of the present invention; and

[0027] Fig. 6 is a schematic perspective structural diagram of the indexing arm in the embodiment of the present invention.

[0028] Description of main reference numerals: 1. Counting assembly; 11. First counting unit; 111. First number wheel; 112. First driving gear; 113. Main driving gear; 114. First fixing shaft; 115. First carrying gear; 12. Second counting unit; 121. Second number wheel; 122. Second driving gear; 123. Second carrying gear; 13. Third counting unit; 131. Third number wheel; 132. Third driving gear; 14. Second fixing shaft; 15. Transmission gear; 16. Cover plate; 2. Indexing arm; 21. Indexing lever; 211. Third cambered surface; 22. First locking protrusion; 221. First cambered surface; 23. Mounting portion; 24. Abutting block; 3. Indexing wheel; 31. Second locking protrusion; 311. Second cambered surface; 32. Locking groove; 4. Limiting block; and 5. Base.Detailed Description of Embodiments

[0029] To make the technical solutions of the present invention more comprehensible to those skilled in the art, the technical solutions of embodiments of the present invention will be described below clearly and comprehensively in conjunction with the accompanying drawings of the embodiments of the present invention. Clearly, the embodiments described are merely some embodiments of the present invention and are not all the possible embodiments. On the basis of the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without involving any inventive effort fall within the scope of protection of the present invention.

[0030] Figs. 1 to 6 show a self-locking type counting device in an embodiment of the present invention. The self-locking type counting device comprises a counting assembly 1, an indexing wheel 3, an indexing arm 2, a first self-locking structure, and a second self-locking structure. The counting assembly 1 comprises a first counting unit 11, and the first counting unit 11 comprises a first number wheel 111 which is rotatable. The indexing wheel 3 rotates synchronously with the first number wheel 111. A first end of the indexing arm 2 is fixed, and a second end of the indexing arm 2 abuts against the indexing wheel 3. The first self-locking structure is located at a position where the indexing arm 2 abuts against the indexing wheel 3, and is capable of limiting the rotation of the indexing wheel 3. The second self-locking structure is configured to fix the first end of the indexing arm 2.

[0031] In this embodiment, a plurality of numbers which are conveniently observed by an operator are disposed on an annular surface of the first number wheel 111. During counting, the operator or another driving mechanism drives the first number wheel 111 to rotate; in this process, the first number wheel 111 overcomes the limitations of the first self-locking structure and the second self-locking structure, and the first number wheel 111 can normally rotate and perform counting. After the first number wheel 111 stops counting and rotating, the rotation of the indexing wheel 3 is limited by means of the first self-locking structure, the rotation of the first number wheel 111 rotating synchronously with the indexing wheel 3 is then limited, and thus the position of the stationary first number wheel 111 is fixed.

[0032] As shown in Figs. 3 and 4, the indexing arm 2 comprises an indexing lever 21 having a certain elasticity; and the first self-locking structure comprises a first locking protrusion 22 disposed at an end portion of the indexing lever 21, a plurality of second locking protrusions 31 disposed on the indexing wheel 3 in an encircling manner, and locking grooves 32 disposed among adjacent second locking protrusions 31, so that the self-locking type counting device in this embodiment has a counting state and a stationary state.

[0033] In the counting state, the indexing wheel 3 continuously rotates and trends to transmit the rotation of the indexing wheel 3 to the indexing arm 2 by means of the first self-locking structure. However, since the indexing arm 2 is limited by the second self-locking structure, the indexing arm 2 cannot rotate, thereby transforming this movement tendency into elastic deformation of the indexing lever 21. Specifically, when the first locking protrusion 22 is in contact with the second locking protrusion 31, the indexing lever 21 is pressed to generate the elastic deformation which allows the first locking protrusion 22 to abut against the second locking protrusion 31; when the first locking protrusion 22 is in contact with the locking groove 32, the elastic deformation of the indexing lever 21 is restored, and the elastic deformation at this time allows the first locking protrusion 22 to abut against the locking groove 32; and finally, the first locking protrusion 21 periodically abuts against the second locking protrusion 31 and the locking groove 32 alternately.

[0034] In the stationary state, the counting assembly 1 stops counting, the indexing wheel 3 is stationary, and the first locking protrusion 22 abuts against the locking groove 32.

[0035] The self-locking type counting device in this embodiment further has an intermediate state, and the indexing wheel 3 has a tendency to become stationary in the intermediate state. To prevent a counting error caused by the fact that the first locking protrusion 22 does not enter the locking groove 32 when the indexing wheel 3 is stationary, the self-locking type counting device in this embodiment further comprises a guide structure, the guide structure is configured to guide the first locking protrusion 22 into the locking groove 32 in the intermediate state, thereby causing the self-locking type counting device to transition from the intermediate state to the stationary state. Specifically, the guide structure comprises a first cambered surface 221 disposed at an end surface of the first locking protrusion 22, and second cambered surfaces 311 disposed at end surfaces of the second locking protrusions 31.

[0036] When the self-locking type counting device in this embodiment ends counting and is in the intermediate state, the indexing wheel 3 is about to stop rotating, if the first locking protrusion 22 is exactly located in the locking groove 32, a formed structure is more stable due to more portions of the first locking protrusion 22 in contact with the locking groove 32. Therefore, a remaining kinetic energy of the indexing wheel 3 cannot cause a relative movement between the first locking protrusion 22 and the locking groove 32, and the first locking protrusion 22 abuts against the locking groove 32 and consumes the remaining kinetic energy of the indexing wheel 3, thereby stopping the rotation of the indexing wheel 3. When the indexing wheel 3 is about to stop rotating, if the first locking protrusion 22 is abutting against the second locking protrusion 31, in this case, since the end surfaces of abutting ends of the first locking protrusion 22 and the second locking protrusion 31 are the first cambered surface 221 and the second cambered surface 311 respectively, the two cambered surfaces have fewer contact portions, a structure formed by the two locking protrusions is relatively unstable, and the indexing wheel 3 continues to rotate by using the remaining kinetic energy until the first locking protrusion 22 is engaged with the locking groove 32.

[0037] As shown in Fig. 5, the first cambered surface 221 has an arc radius of 0.5-1.5 mm, and especially, the arc radius of the first cambered surface 221 may be set to 0.5 mm, 1 mm or 1.5 mm.

[0038] During the rotation of the indexing wheel 3, in order to reduce the resistance caused by the first self-locking structure, a third cambered surface 211 is disposed on one side and / or two sides of the indexing lever 21, and the bending direction of the third cambered surface 211 is opposite to the direction of the first cambered surface 221. After the third cambered surface 211 is disposed, the elastic deformation capability of the indexing lever 21 can be improved, and thus the resistance encountered during the rotation of the indexing wheel 3 is reduced. Specifically, the third cambered surface 211 may be disposed on a side close to the first locking protrusion 22 or a side away from the first locking protrusion 22, or the third cambered surfaces 211 are disposed on the two sides. In addition, the arc radius of the third cambered surface 211 may be set to 3-4 mm, and especially, may be set to 3 mm, 3.5 mm, or 4 mm.

[0039] In an embodiment, the indexing arm 2 further comprises a mounting portion 23 disposed at one end of the indexing arm 2, the indexing lever 21 is fixed on or integrally formed with the mounting portion 23, the second self-locking structure comprises a limiting block 4 and an abutting block 24 fixed on the mounting portion 23, the abutting block 24 abuts against the limiting block 4, and the position of the limiting block 4 is fixed. The limiting block 4 is in interference fit with the abutting block 24, and a structure formed by the limiting block and the abutting block can limit the rotation of the mounting portion 23 and the indexing lever 21, such that when the indexing wheel 3 rotates, the indexing lever 21 can periodically generate the elastic deformation, thus allowing the first locking protrusion 22 to abut against the second locking protrusion 31 and the locking groove 32 alternately.

[0040] Further, since fatigue deformation may occur after the indexing lever 21 is repeatedly deformed for a long time, and a certain degree of abrasion may also occur after the first locking protrusion 22 abuts against the indexing wheel 3 for a long time, the indexing arm 2 in this embodiment is detachable to facilitate the replacement of the damaged indexing arm 2. Specifically, the mounting portion 23 of the indexing arm 2 may be movably mounted on a fixing shaft, the indexing arm 2 is then prevented from rotating by using the second self-locking structure, and when it is required to replace the indexing arm 2, the mounting portion 23 of the indexing arm 2 is removed from the fixing shaft, and a new indexing arm 2 can then be mounted directly.

[0041] Further, in order to enable the indexing arm 2 to still accurately cooperate with the indexing wheel 3 after the indexing arm 2 is replaced, the end surface of the abutting block 24 abutting against the limiting block 4 is set to be arc-shaped, and the arc-shaped end surface can allow the abutting block 24 to be in linear contact with the limiting block 4, such that when the indexing arm 2 is replaced, there is a more accurate reference object for positioning assistance, which is a contact line between the abutting block 24 and the limiting block 4. Specifically, the arc radius of the end surface of the abutting block 24 in contact with the limiting block 4 may be set to 0.5-1.5 mm, and especially, may be set to 0.5 mm, 0.8 mm, 1 mm, or 1.5 mm.

[0042] Further, an included angle exists between the abutting block 24 and the indexing lever 21, that is, the abutting block 24 and the indexing lever 21 can form different included angles with the axis of the mounting portion 23. Therefore, when the mounting portion 23 is disposed in a vertical direction, the abutting block 24 and the indexing lever 21 can be disposed at the same height with the mounting portion 23, so that a total space occupied by the mounting portion 23, the abutting block 24 and the indexing lever 21 is reduced, and the overall size of the self-locking type counting device in this embodiment is reduced.

[0043] As shown in Figs. 2-4, the first counting unit 11 in this embodiment further comprises a first driving gear 112, a main driving gear 113 and a first fixing shaft 114; the first driving gear 112, the first number wheel 111 and the indexing wheel 3 are coaxially mounted on the first fixing shaft 114 and rotate synchronously, the main driving gear 113 is in meshed connection with the first driving gear 112, and the first number wheel 111 can be driven to rotate and perform counting by driving the main driving gear 113.

[0044] Further, in order to expand the counting range of the self-locking type counting device in this embodiment, the first counting unit 11 further comprises a first carrying gear 115, the first carrying gear 115 is mounted on the first fixing shaft 114 and rotates synchronously with the first number wheel 111, and the first carrying gear 115 is an incomplete gear. The counting assembly 1 further comprises one or more second counting units 12, a third counting unit 13, a second fixing shaft 14 and a plurality of transmission gears 15, the third counting unit 13 is mounted on the first fixing shaft 114, and the third counting unit 13 comprises a third number wheel 131 and a third driving gear 132 which rotate synchronously. The second counting unit 12 is mounted on the first fixing shaft 114, the second counting unit 12 comprises a second number wheel 121, a second driving gear 122 and a second carrying gear 123 which rotate synchronously, and the second carrying gear 123 is an incomplete gear. The transmission gears 15 are mounted on the second fixing shaft 14, the single transmission gear 15 is meshed with the single third driving gear 132, and this transmission gear 15 is also periodically meshed with the first carrying gear 115 or the second carrying gear 123.

[0045] During specific counting, after the first number wheel 111 rotates by one circle, the first carrying gear 115 is meshed with the corresponding transmission gear 15 once to drive the transmission gear 15 to rotate by a certain angle, and meanwhile, the transmission gear 15 synchronously drives the second driving gear 122 meshed therewith to rotate by a certain angle, and the second number wheel 121 rotates synchronously with the second driving gear 122, so that numbers on the second number wheel 121 that can be observed by the operator are changed to achieve carrying. Similarly, when the second number wheel 121 intermittently rotates by one circle, the next second number wheel 121 or the third number wheel 131 is driven to rotate by a certain angle, thereby achieving carrying.

[0046] Further, in order to save the space occupied by the self-locking type counting device in the embodiment of the present invention and to simplify a transmission and connection structure thereof, the mounting portion 23 is mounted on the second fixing shaft 14. In order to facilitate the removal of the mounting portion 23, a corresponding shaft hole may be formed in the mounting portion 23, and the shaft hole fits with the second fixing shaft 14.

[0047] Further, end portions of the first fixing shaft 114, the second fixing shaft 14 and the limiting block 4 are all fixed on a base 6, and a cover plate 16 is further mounted at the other end of each of the first fixing shaft 114 and the second fixing shaft 14.

[0048] Another embodiment of the present invention further provides a pipettor. The pipettor is provided with the above-mentioned self-locking type counting device and other necessary components for achieving a pipetting effect.

[0049] It can be seen from the technical solutions of the above embodiments that the self-locking type counting device in an embodiment of the present invention can achieve manual counting and also achieve self-locking after completing the counting, thereby preventing an external force from affecting a counting result and ensuring the accuracy of the counting result. Furthermore, during the counting, the counting assembly can easily overcome the limitations of the first self-locking structure and the second self-locking structure, so that it is easier for the operator to manually drive the counting assembly.

[0050] The self-locking type counting device provided in the embodiments of the present invention may be a universal device, which not only can be applied to a pipettor, but also can be applied to other devices which need to have a counting function and a function of self-locking after counting.

[0051] For those skilled in the art, it is apparent that the present invention is not limited to the details of the above-mentioned exemplary embodiments, and the present invention can be implemented in other specific forms without departing from the spirit or basic features of the present invention. Therefore, no matter from which point of view, these embodiments should all be regarded as exemplary and non-limiting. The scope of the present invention is defined by the appended claims rather than the above-mentioned description, and therefore it is intended that all changes which fall within the meaning and range of equivalents of the claims are embraced in the present invention. Any reference signs in the claims should not be construed as limiting the claims involved.

[0052] In addition, it should be understood that although the specification describes implementations, not every implementation includes only a single technical solution, this description is for the sake of clarity only, a skilled person in the art should regard the specification as a whole, and that the technical solutions in the various embodiments may be appropriately combined to form other implementations which may be understood by a skilled person in the art.

Claims

1. A self-locking type counting device, characterized by comprising:a counting assembly (1), which comprises a first counting unit (11), the first counting unit (11) comprising a first number wheel (111) which is rotatable;an indexing wheel (3), which rotates synchronously with the first number wheel (111);an indexing arm (2), with a first end thereof being fixed, and a second end thereof abutting against the indexing wheel (3);a first self-locking structure, which is located at a position where the indexing arm (2) abuts against the indexing wheel (3), and capable of limiting the rotation of the indexing wheel (3); anda second self-locking structure, which is configured to fix the first end of the indexing arm (2).

2. The self-locking type counting device according to claim 1, characterized in that the indexing arm (2) comprises an indexing lever (21), the first self-locking structure comprises a first locking protrusion (22) disposed at an end portion of the indexing lever (21), a plurality of second locking protrusions (31) disposed on the indexing wheel (3) in an encircling manner, and locking grooves (32) disposed among adjacent second locking protrusions (31), and the self-locking type counting device has a counting state and a stationary state;in the counting state, the indexing wheel (3) rotates, and the first locking protrusion (22) abuts against the second locking protrusion (31) and the locking groove (32) alternately; andin the stationary state, the indexing wheel (3) is stationary, and the first locking protrusion (22) abuts against the locking groove (32).

3. The self-locking type counting device according to claim 2, characterized in that the self-locking type counting device further has an intermediate state, and the indexing wheel (3) has a tendency to become stationary in the intermediate state;the self-locking type counting device further comprises a guide structure, and the guide structure is configured to guide the first locking protrusion (22) into the locking groove (32) in the intermediate state, thereby causing the self-locking type counting device to transition from the intermediate state to the stationary state; andthe guide structure comprises a first cambered surface (221) disposed at an end surface of the first locking protrusion (22), and second cambered surfaces (311) disposed at end surfaces of the second locking protrusions (31).

4. The self-locking type counting device according to claim 3, characterized in that the first cambered surface (221) has an arc radius of 0.5-1.5 mm.

5. The self-locking type counting device according to claim 3, characterized in that a third cambered surface (211) is disposed on one side and / or two sides of the indexing lever (21), the bending direction of the third cambered surface (211) is opposite to the direction of the first cambered surface (221), and the third cambered surface (211) has an arc radius of 3-4 mm.

6. The self-locking type counting device according to claim 2, characterized in that the indexing arm (2) further comprises a mounting portion (23) disposed at one end of the indexing arm (2), the indexing lever (21) is fixed on or integrally formed with the mounting portion (23), the second self-locking structure comprises a limiting block (4) and an abutting block (24) fixed on the mounting portion (23), the abutting block (24) abuts against the limiting block (4), and the position of the limiting block (4) is fixed.

7. The self-locking type counting device according to claim 1, characterized in that the indexing arm (2) is detachable.

8. The self-locking type counting device according to claim 6, characterized in that an end surface of the abutting block (24) abutting against the limiting block (4) is arc-shaped, and the end surface has an arc radius of 0.5-1.5 mm.

9. The self-locking type counting device according to claim 6, characterized in that an included angle exists between the abutting block (24) and the indexing lever (21).

10. The self-locking type counting device according to claim 6, characterized in that the first counting unit (11) further comprises a first driving gear (112), a main driving gear (113) and a first fixing shaft (114); the first driving gear (112), the first number wheel (111) and the indexing wheel (3) are coaxially mounted on the first fixing shaft (114) and rotate synchronously, and the main driving gear (113) is in meshed connection with the first driving gear (112).

11. The self-locking type counting device according to claim 10, characterized in that the first counting unit (11) further comprises a first carrying gear (115), the first carrying gear (115) is mounted on the first fixing shaft (114) and rotates synchronously with the first number wheel (111), and the first carrying gear (115) is an incomplete gear;the counting assembly (1) further comprises:a second counting unit (13), which is mounted on the first fixing shaft (114), the third counting unit (13) comprising a third number wheel (131) and a third driving gear (132) which rotate synchronously;one or more second counting unit (12), which are mounted on the first fixing shaft (114), the second counting unit (12) comprising a second number wheel (121), a second driving gear (122) and a second carrying gear (123) which rotate synchronously, and the second carrying gear (123) being an incomplete gear;a second fixing shaft (14); anda plurality of transmission gears (15), which are mounted on the second fixing shaft (14), the single transmission gear (15) being meshed with the single third driving gear (132), and the transmission gear (15) being also periodically meshed with the first carrying gear (115) or the second carrying gear (123).

12. The self-locking type counting device according to claim 11, characterized in that the mounting portion (23) is mounted on the second fixing shaft (14).

13. A pipettor, characterized by comprising a self-locking type counting device of any one of claims 1 to 12.

Images