Clamp mechanism

Abstract

The utility model provides a clamp mechanism. The clamp mechanism comprises a mounting base, a connecting base, a clamping jaw, a limiting piece and a first driving assembly. At least part of the connecting bases are installed on the installation base in a sliding mode in the preset direction, and each connecting base is provided with a clamping jaw. The maximum distance between the two adjacent connecting seats is limited through the limiting piece between the two adjacent connecting seats. When the first driving assembly drives the connecting bases at the two ends to move away from each other, the distance between every two adjacent connecting bases can be increased, namely, the distance between every two adjacent clamping jaws is increased. When the first driving assembly drives the connecting bases at the two ends to move close to each other, the distance between every two adjacent connecting bases can be reduced, namely, the distance between every two adjacent clamping jaws is reduced. The clamp mechanism can change the distance between every two adjacent clamping jaws according to needs.

Description

Technical Field

[0001] This application belongs to the technical field of fixture structures, and particularly relates to a fixture mechanism. Background Art

[0002] Multiple jaws in a fixture mechanism are arranged in sequence, and each jaw can grasp a predetermined item, improving the efficiency of grasping and transferring items. How to provide a fixture mechanism that can adjust the distance between adjacent jaws has become an issue that the industry needs to face. Summary of the Utility Model

[0003] An object of the embodiments of this application is to provide a fixture mechanism that can adjust the distance between adjacent jaws.

[0004] The embodiments of this application provide a fixture mechanism, including: a mounting base, multiple connecting seats, multiple jaws, at least one limiting member, and a first driving component; wherein at least one of the connecting seats is fixed to the mounting base, and the other connecting seats are slidably mounted on the mounting base along a predetermined direction; alternatively, all the connecting seats are slidably mounted on the mounting base along a predetermined direction; the jaws are respectively mounted on the connecting seats in one-to-one correspondence; each adjacent pair of the connecting seats is connected by the limiting member, and the limiting member is used to limit the maximum distance between the adjacent two connecting seats; the first driving component is used to drive the connecting seats at both ends to move closer or move away.

[0005] In an optional implementation manner, the first driving component has a fixed part and an output shaft, the output shaft can telescopically move relative to the fixed part, and the fixed part and the output shaft are respectively connected to the connecting seats at both ends in one-to-one correspondence.

[0006] In an optional implementation manner, each connecting seat is provided with a pin, the limiting member has a strip-shaped groove extending along a predetermined direction, and the pin is inserted into the strip-shaped groove; during the process of the first driving component driving the connecting seats at both ends to move, the pin and the strip-shaped groove are in sliding fit.

[0007] In an optional implementation manner, the mounting base includes a body part, a first mounting part, and a second mounting part, the first mounting part and the second mounting part are respectively provided with different numbers and / or different sizes of the jaws; the first mounting part and the second mounting part can be alternatively and detachably mounted on the body part.

[0008] In an alternative implementation, the first driving component is a first cylinder, the main body portion has a first air passage, the first mounting portion has a second air passage, and the second mounting portion has a third air passage; one end of the first air passage is provided with a first positioning pin, and the first positioning pin has a first flow passage; when the first mounting portion is mounted on the main body portion and the first positioning pin is inserted into the second air passage, the first air passage and the second air passage are communicated through the first flow passage; when the second mounting portion is mounted on the main body portion and the first positioning pin is inserted into the third air passage, the first air passage and the third air passage are communicated through the first flow passage.

[0009] In an alternative implementation, the first positioning pin is threadedly connected to the main body portion;

[0010] In an alternative implementation, a washer is clamped between the first positioning pin and the main body portion;

[0011] In an alternative implementation, a sealing ring is sleeved on the end of the first positioning pin protruding from the main body portion.

[0012] In an alternative implementation, the first mounting portion or the second mounting portion can be detachably mounted on the main body portion through a fastener;

[0013] In an alternative implementation, the first mounting portion or the second mounting portion can be detachably mounted on the main body portion through a snap structure.

[0014] In an alternative implementation, the mounting base has a slide rail extending in a predetermined direction, and at least one of the connecting seats is provided with a slider, and the slider is slidably mounted on the slide rail.

[0015] In an alternative implementation, when one of the connecting seats is fixed to the mounting base and the number of the connecting seats is at least three, the connecting seat fixed to the mounting base is located in the middle of all the connecting seats.

[0016] In an alternative implementation, when all the connecting seats are slidably mounted on the mounting base in a predetermined direction, one of the limiting members is fixed to the mounting base.

[0017] The beneficial effects of the fixture mechanism provided by the embodiments of the present application are as follows: At least part of the connecting seats are slidably mounted on the mounting seat in a predetermined direction, and each connecting seat is respectively provided with a clamping jaw. The maximum distance between adjacent two connecting seats is limited by a limiting member between the adjacent two connecting seats. When the first driving component drives the connecting seats at both ends to move away from each other, the distance between the adjacent two connecting seats can be increased, that is, the distance between the adjacent two clamping jaws can be increased. When the first driving component drives the connecting seats at both ends to move closer to each other, the distance between the adjacent two connecting seats can be decreased, that is, the distance between the adjacent two clamping jaws can be decreased. The fixture mechanism can change the distance between the adjacent two clamping jaws as required. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following will briefly introduce the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings in the following description are only some embodiments of the present application. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0019] Figure 1 It is a three-dimensional assembly drawing of the fixture mechanism provided by the embodiments of the present application, with the adjacent clamping jaws at the maximum distance;

[0020] Figure 2 is Figure 1 Another perspective three-dimensional assembly drawing of the fixture mechanism;

[0021] Figure 3 It is a three-dimensional assembly drawing of the fixture mechanism provided by the embodiments of the present application, with the adjacent clamping jaws at the minimum distance;

[0022] Figure 4 is Figure 3 Another perspective three-dimensional assembly drawing of the fixture mechanism;

[0023] Figure 5 is Figure 1 Three-dimensional exploded view of the fixture mechanism;

[0024] Figure 6 It is a three-dimensional exploded view of the fixture mechanism provided by the embodiments of the present application;

[0025] Figure 7 is Figure 6 Three-dimensional assembly drawing of the fixture mechanism;

[0026] Figure 8 is Figure 1 Cross-sectional view of the fixture mechanism along line A-A;

[0027] Figure 9 is Figure 5 Cross-sectional view of the fixture mechanism along line B-B. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0028] In order to make the technical problems, technical solutions and beneficial effects to be solved by this application clearer and more understandable, the following further details this application in combination with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain this application and are not used to limit this application.

[0029] In the description of the embodiments of this application, it should be understood that the orientation or positional relationships indicated by the terms "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. are based on the orientation or positional relationships shown in the accompanying drawings. These are only for the convenience of describing the embodiments of this application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the embodiments of this application.

[0030] In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include one or more of such features. In the description of this application, "a plurality of" means two or more, unless otherwise specifically defined.

[0031] In the embodiments of this application, unless otherwise clearly specified and limited, the terms "installation", "connection", "connection", "fixation", etc. should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or integrated; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two elements or the interaction relationship between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the embodiments of this application can be understood according to specific circumstances.

[0032] Please refer to Figures 1 to 4 , the embodiments of this application provide a fixture mechanism 100a, including: a mounting base 150, a plurality of connecting seats 160, a plurality of clamping jaws 100, at least one limiting member 170, and a first driving assembly 180. At least one of the connecting seats 160 is fixed to the mounting base 150, and the other connecting seats 160 are slidably mounted on the mounting base 150 along a predetermined direction. Or, all the connecting seats 160 are slidably mounted on the mounting base 150 along a predetermined direction. The clamping jaws 100 are respectively mounted on the connecting seats 160. Each adjacent pair of connecting seats 160 is connected by a limiting member 170, and the limiting member 170 is used to limit the maximum distance between two adjacent connecting seats 160. The first driving assembly 180 is used to drive the connecting seats 160 at both ends to move closer or move away from each other.

[0033] Among them, the number of the limiting members 170 can be set according to the number of the connecting seats 160, and the number of the limiting members 170 is one less than the number of the connecting seats 160. For example, if there are 5 connecting seats 160, 4 limiting members 170 are required, and each adjacent two connecting seats 160 are connected by one limiting member 170.

[0034] The first driving assembly 180 drives the connecting seats 160 at both ends to move closer or farther away. It can be that the connecting seats 160 at both ends move, or it can be that one connecting seat 160 moves while the other connecting seat 160 remains stationary.

[0035] In the fixture mechanism 100a provided by the embodiment of the present application, at least some of the connecting seats 160 are slidably mounted on the mounting seat 150 along a predetermined direction, and each connecting seat 160 is respectively provided with a jaw 100. The maximum distance between two adjacent connecting seats 160 is limited by the limiting member 170 between two adjacent connecting seats 160. As Figure 1 、 Figure 2 shown, when the first driving assembly 180 drives the connecting seats 160 at both ends to move farther away, the distance between two adjacent connecting seats 160 can be increased, that is, the distance between two adjacent jaws 100 is increased. As Figure 3 、 Figure 4 shown, when the first driving assembly 180 drives the connecting seats 160 at both ends to move closer, the distance between two adjacent connecting seats 160 can be decreased, that is, the distance between two adjacent jaws 100 is decreased. The fixture mechanism 100a can change the distance between two adjacent jaws 100 as required.

[0036] The object grasped by the jaw 100 can be an object with a surface that is easily damaged, or a hard object. The object with a surface that is easily damaged can be a fruit with an easily damaged appearance, granular or spherical, such as waxberry, cherry, strawberry, etc.

[0037] Exemplarily, the fixture mechanism 100a grasps a plurality of objects from the material taking position and transfers the plurality of objects to the packaging box at the material placing position. The distance between two adjacent objects at the material taking position is larger, and the distance between two adjacent objects at the material placing position is smaller. As Figure 1 、 Figure 2 shown, at the material placing position, the first driving assembly 180 drives the connecting seats 160 at both ends to move farther away, so that the two adjacent connecting seats 160 are at the maximum distance. As Figure 3 、 Figure 4 shown, at the material placing position, the first driving assembly 180 drives the connecting seats 160 at both ends to move closer, so that the two adjacent connecting seats 160 are at the minimum distance.

[0038] In some embodiments, please refer to Figure 2 、 Figure 4, the first driving component 180 has a fixing part 181 and an output shaft 182. The output shaft 182 can telescopically move relative to the fixing part 181. The fixing part 181 and the output shaft 182 are respectively connected to the connecting seats 160 at both ends.

[0039] Combined with Figure 1 , Figure 2 , during the process that the output shaft 182 extends relative to the fixing part 181 to the maximum stroke, the fixing part 181 and the output shaft 182 can drive the connecting seats 160 at both ends to move away from each other, increasing the distance between the two connecting seats 160 at both ends, and the maximum distance between adjacent two connecting seats 160 is limited by the limiting member 170. When the number of the connecting seats 160 is greater than or equal to four, when the output shaft 182 extends, the fixing part 181 and the output shaft 182 can drive the connecting seats 160 at both ends to move, and some of the limiting members 170 also play a role in pulling the corresponding connecting seats 160 to move, so that the distance between each adjacent two connecting seats 160 increases.

[0040] Combined with Figure 3 , Figure 4 , during the process that the output shaft 182 retracts relative to the fixing part 181, the fixing part 181 and the output shaft 182 can drive the connecting seats 160 at both ends to move closer to each other, reducing the distance between the two connecting seats 160 at both ends until adjacent two connecting seats 160 are in contact.

[0041] Exemplarily, the first driving component 180 is a first cylinder, and the fixing part 181 and the output shaft 182 are respectively a cylinder barrel and a piston. When the piston of the first cylinder extends, the distance between adjacent connecting seats 160 is the largest. When the piston of the first cylinder retracts, the distance between adjacent connecting seats 160 is the smallest.

[0042] In some embodiments, please refer to Figures 1 to 4 , one end of the fixing part 181 away from the output shaft 182 is fixed to the connecting seat 160 at one end through a first connecting plate 183, and one end of the output shaft 182 away from the fixing part 181 is fixed to the connecting seat 160 at the other end through a second connecting plate 184. It is convenient to install the first driving component 180 on the connecting seats 160 at both ends.

[0043] In some embodiments, please refer to Figure 1 , Figure 3 , each connecting seat 160 is provided with a pin 171, and the limiting member 170 has a strip-shaped groove 172 extending along a predetermined direction. The pin 171 is inserted into the strip-shaped groove 172. During the process that the first driving component 180 drives the connecting seats 160 at both ends to move, the pin 171 and the strip-shaped groove 172 are in sliding fit. When the pin 171 abuts against the inner wall of the end of the strip-shaped groove 172, the maximum distance between adjacent two connecting seats 160 can be limited.

[0044] Exemplarily, the pin 171 can be threadedly connected to the connecting seat 160, facilitating the assembly of the pin 171 and the limiting member 170. The pin 171 can have a head. When the pin 171 passes through the strip-shaped groove 172, the limiting member 170 is limited by the head of the pin 171 and cannot be detached.

[0045] In some embodiments, referring to Figure 1 , Figures 5 to 7 , the mounting seat 150 includes a body portion 151, a first mounting portion 152, and a second mounting portion 153. The first mounting portion 152 and the second mounting portion 153 are respectively provided with jaws 100 of different quantities and / or different sizes. The first mounting portion 152 and the second mounting portion 153 can be alternatively and detachably mounted on the body portion 151.

[0046] The first mounting portion 152 and the second mounting portion 153 can be alternatively and detachably mounted on the body portion 151, which means that one of the first mounting portion 152 and the second mounting portion 153 is mounted on the body portion 151, the other is not mounted on the body portion 151, and the first mounting portion 152 and the second mounting portion 153 can be detached from the body portion 151.

[0047] The jaws 100 of different quantities and / or different sizes can be jaws 100 of different quantities but the same size, jaws 100 of the same quantity but different sizes, or jaws 100 of both different quantities and different sizes. The jaws 100 of different sizes can grasp objects of different sizes.

[0048] The mounting seat 150 is provided as a body portion 151 and different mounting portions, and the different mounting portions are provided with jaws 100 of different quantities and / or different sizes. Adopting a modular design facilitates the user to select the first mounting portion 152 or the second mounting portion 153 as needed, realizes the rapid replacement of the quantity and / or size of the jaws 100, and enables the fixture mechanism 100a to quickly adapt to different usage scenarios.

[0049] Exemplarily, as Figure 1 , Figure 5 shown, the first mounting portion 152 is mounted with 5 small-sized jaws 100, and the small-sized jaws 100 can grasp small-sized objects. As Figure 6 , Figure 7 shown, the second mounting portion 153 is mounted with 4 large-sized jaws 100, and the large-sized jaws 100 can grasp large-sized objects. For example, when the jaws 100 are used to grasp bayberries, the large jaws 100 can grasp large-grained bayberries, and the small jaws 100 can grasp small-grained bayberries.

[0050] In addition, the first mounting portion 152 and the second mounting portion 153 can be provided with jaws 100 of different quantities and / or different sizes as needed.

[0051] In some embodiments, refer to Figure 5 , Figure 8 , Figure 9 . The first driving component 180 is a first cylinder, and the body portion 151 has a first air passage 1511. One end of the first air passage 1511 is provided with a first positioning pin 1512, and the first positioning pin 1512 has a first flow passage 1512a. The first positioning pin 1512 serves to position the first mounting portion 152 or the second mounting portion 153 on the body portion 151, and also serves to connect different air passages to form an air flow channel.

[0052] Refer to Figure 5 , Figure 8 , Figure 9 . The first mounting portion 152 has a second air passage 1521, and the second air passage 1521 is used to connect with the first cylinder to allow air to flow in and out of the first cylinder. Refer to Figure 7 . The second mounting portion 153 has a third air passage 1531, and the third air passage 1531 is used to connect with the first cylinder to allow air to flow in and out of the first cylinder.

[0053] Refer to Figure 8 . When the first mounting portion 152 is mounted on the body portion 151 and the first positioning pin 1512 is inserted into the second air passage 1521, the first air passage 1511 and the second air passage 1521 are connected through the first flow passage 1512a. Through the first positioning pin 1512, the first mounting portion 152 is positioned on the body portion 151, preparing for the fixed connection between the first mounting portion 152 and the body portion 151. The first flow passage 1512a of the first positioning pin 1512 realizes the connection between the first air passage 1511 and the second air passage 1521.

[0054] Refer to Figure 6 , Figure 7 . When the second mounting portion 153 is mounted on the body portion 151 and the first positioning pin 1512 is inserted into the third air passage 1531, the first air passage 1511 and the third air passage 1531 are connected through the first flow passage 1512a. Through the second positioning pin, the second mounting portion 153 is positioned on the body portion 151, preparing for the fixed connection between the second mounting portion 153 and the body portion 151. The first flow passage 1512a of the first positioning pin 1512 realizes the connection between the first air passage 1511 and the third air passage 1531.

[0055] In some embodiments, refer to Figure 1 , Figure 2 . A first air nozzle 1513 is provided at the port of the first air passage 1511. A second air nozzle 1522 is provided at the port of the second air passage 1521, and the second air nozzle 1522 and the first cylinder corresponding to the first mounting portion 152 can be connected by a trachea. A third air nozzle is provided at the port of the third air passage 1531, and the third air nozzle and the first cylinder corresponding to the second mounting portion 153 can be connected by a trachea.

[0056] Refer to Figure 5 、 Figure 8 、 Figure 9 As shown in, the body part 151 has two first air passages 1511, and each first air passage 1511 is provided with a first positioning pin 1512. Correspondingly, the first mounting part 152 has two second air passages 1521, and the second mounting part 153 has two third air passages 1531. When the first mounting part 152 or the second mounting part 153 is mounted on the body part 151, the two groups of air passages are connected through the two first positioning pins 1512 to realize the intake and exhaust of the first cylinder.

[0057] In some embodiments, refer to Figure 8 、 Figure 9 The first positioning pin 1512 is threadedly connected to the body part 151, which is convenient for the reliable connection of the first positioning pin 1512 to the body part 151.

[0058] In some embodiments, refer to Figure 8 、 Figure 9 A washer 1514 is clamped between the first positioning pin 1512 and the body part 151. The washer 1514 can achieve the seal between the first positioning pin 1512 and the body part 151 to prevent air leakage.

[0059] In some embodiments, refer to Figure 8 、 Figure 9 A sealing ring 1515 is sleeved on the end of the first positioning pin 1512 extending out of the body part 151. The sealing ring 1515 can achieve the seal between the first positioning pin 1512 and the first mounting part 152 (or the second mounting part 153) to prevent air leakage.

[0060] In some embodiments, refer to Figure 8 The first mounting part 152 or the second mounting part 153 can be detachably mounted on the body part 151 through a fastener. The first mounting part 152 or the second mounting part 153 can be detachably mounted on the body part 151. The fastener can be a screw. The screw can pass through the through hole 1516 of the body part 151 and be threadedly connected to the threaded hole 1523 of the first mounting part 152 (or the second mounting part 153) to fix the first mounting part 152 (or the second mounting part 153) to the body part 151.

[0061] In some embodiments, the first mounting part 152 or the second mounting part 153 can be detachably mounted on the body part 151 through a snap structure. The first mounting part 152 or the second mounting part 153 can be detachably mounted on the body part 151. The snap structure includes a snap and a slot, and one of the snap and the slot is provided on the first mounting part 152 (or the second mounting part 153), and the other is provided on the body part 151.

[0062] In some embodiments, referring to Figures 1 to 4 , the mounting base 150 has a slide rail 154 extending in a predetermined direction, and at least one connecting base 160 is provided with a slider 155, and the slider 155 is slidably mounted on the slide rail 154. By using the slide rail 154 and the slider 155, it is convenient for the connecting base 160 to be slidably mounted on the mounting base 150 along the predetermined direction.

[0063] In some embodiments, referring to Figure 1 , in the case where one of the connecting bases 160 is fixed to the mounting base 150 and the number of the connecting bases 160 is at least three, the connecting base 160a fixed to the mounting base 150 is located in the middle of all the connecting bases 160.

[0064] The middle of all the connecting bases 160 refers to the position close to the middle of all the connecting bases 160, not necessarily the absolute middle position. The connecting base 160a fixed to the mounting base 150 is arranged at the middle position instead of the end position. During the process that the first driving assembly 180 drives the two end connecting bases 160 to move away from each other, the distance between two adjacent connecting bases 160 increases relatively quickly. During the process that the first driving assembly 180 drives the two end connecting bases 160 to move closer to each other, the distance between two adjacent connecting bases 160 decreases relatively quickly.

[0065] In other embodiments, in the case where one of the connecting bases 160 is fixed to the mounting base 150 and the number of the connecting bases 160 is at least three, the connecting base 160a fixed to the mounting base 150 is located at the end of all the connecting bases 160. During the process that the first driving assembly 180 drives the two end connecting bases 160 to move, the distance between two adjacent connecting bases 160 can be adjusted.

[0066] In some embodiments, referring to Figure 6 , in the case where all the connecting bases 160 are slidably mounted on the mounting base 150 along the predetermined direction, one of the limiting members 170a is fixed to the mounting base 150.

[0067] When the first driving assembly 180 drives the two end connecting bases 160 to move to the maximum stroke, the limiting member 170a fixed to the mounting base 150 can limit the position of the connecting base 160, so that each time the first driving assembly 180 drives the connecting base 160 to move, the multiple connecting bases 160 are kept at the predetermined positions.

[0068] In some embodiments, the jaw 100 can be a pneumatic jaw, and compressed air is used as power to realize the grasping of a predetermined object. The jaw 100 can be mounted on the connecting base 160 through a clamping member, and the clamping member can be fixed to the connecting base 160 through a fastener (such as a screw).

[0069] The above are only the preferred embodiments of the present application and are not intended to limit the present application. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present application shall be included within the protection scope of the present application.

Claims

1. A fixture mechanism, characterized in that, Comprising: A mounting base, a plurality of connecting seats, a plurality of clamping jaws, at least one limiting member, and a first driving assembly; Wherein at least one of the connecting seats is fixed to the mounting base, and the other connecting seats are slidably mounted on the mounting base along a predetermined direction; alternatively, all the connecting seats are slidably mounted on the mounting base along a predetermined direction; The clamping jaws are respectively mounted on the connecting seats in one-to-one correspondence; Each adjacent pair of the connecting seats is connected by the limiting member, and the limiting member is used to limit the maximum distance between the adjacent two connecting seats; The first driving assembly is used to drive the connecting seats at both ends to move closer or move away from each other.

2. The jig mechanism according to claim 1, wherein The first driving assembly has a fixed part and an output shaft, and the output shaft can telescopically move relative to the fixed part, and the fixed part and the output shaft are respectively connected to the connecting seats at both ends in one-to-one correspondence.

3. The fixture mechanism according to claim 1, wherein Each connecting seat is provided with a pin, and the limiting member has a strip-shaped groove extending along a predetermined direction, and the pin is inserted into the strip-shaped groove; During the process of the first driving assembly driving the connecting seats at both ends to move, the pin and the strip-shaped groove are in sliding fit.

4. The jig mechanism according to any one of claims 1 to 3, characterized in that, The mounting base includes a body part, a first mounting part, and a second mounting part, and the first mounting part and the second mounting part are respectively provided with different numbers and / or different sizes of the clamping jaws; the first mounting part and the second mounting part can be alternatively and detachably mounted on the body part.

5. The jig mechanism according to claim 4, characterized in that, The first driving assembly is a first cylinder, the body part has a first air passage, the first mounting part has a second air passage, and the second mounting part has a third air passage; One end of the first air passage is provided with a first positioning pin, and the first positioning pin has a first flow passage; When the first mounting part is mounted on the body part and the first positioning pin is inserted into the second air passage, the first air passage and the second air passage are communicated through the first flow passage; When the second mounting part is mounted on the body part and the first positioning pin is inserted into the third air passage, the first air passage and the third air passage are communicated through the first flow passage.

6. The jig mechanism according to claim 5, characterized in that, The first positioning pin is threadedly connected to the body part; And / or, a washer is clamped between the first positioning pin and the body part; And / or, a sealing ring is sleeved on the end of the first positioning pin protruding from the body part.

7. The jig mechanism according to claim 4, wherein The first mounting part or the second mounting part can be detachably mounted on the body part through a fastener; Or, the first mounting part or the second mounting part can be detachably mounted on the body part through a snap structure.

8. The fixture mechanism according to any one of claims 1 to 3, characterized in that, The mounting base has a slide rail extending along a predetermined direction, and at least one of the connecting seats is provided with a slider, and the slider is slidably mounted on the slide rail.

9. The jig mechanism according to any one of claims 1 to 3, characterized in that, In the case where one of the connecting seats is fixed to the mounting base and the number of the connecting seats is at least three, the connecting seat fixed to the mounting base is located in the middle of all the connecting seats.

10. The jig mechanism according to any one of claims 1 to 3, characterized in that, In the case where all the connecting seats are slidably mounted on the mounting base along a predetermined direction, one of the limiting members is fixed to the mounting base.

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