Sealed box and stationary device

Abstract

The present invention relates to a sealed box and a stationary device. The sealed box comprises: an upper cover; a lower cover, which is detachably connected to the upper cover and encloses with the upper cover to form a receiving cavity for receiving a workpiece; a sealing groove surrounding the receiving cavity is provided on the side of the lower cover facing the upper cover; and an elastic sealing ring, comprising a sealing end in sealing contact with the upper cover and a deformation end extending into the sealing groove relative to the sealing end; wherein, the lower cover is provided with an air filling hole penetrating into the sealing groove, and the deformation end is deformed under the action of the airflow filled into the sealing groove through the air filling hole, and squeezes the groove wall of the sealing groove to apply a force to the lower cover toward the upper cover.

Description

Technical Field

[0001] The invention relates to the technical field of battery manufacturing, and in particular to a sealing box and a stationary device. Background Art

[0002] Lithium battery is a green energy with the advantages of high operating voltage, high energy density, long cycle life and no memory effect. It has been widely used in various industries, especially electric vehicles have been greatly developed in recent years.

[0003] Injection is an important process in the production of lithium batteries, which directly affects the performance of the battery. In order to ensure that the electrolyte injected into the battery is accelerated to infiltrate, the battery after injection needs to be placed in a sealed box, and the sealed box is pressurized (i.e., inflated) or evacuated (vacuumed) during the static process. When the sealed box is inflated, a downward pressure will be applied to the bottom cover of the sealed box, thereby affecting the sealing between the bottom cover and the box body, making it difficult to pressurize and affecting the static effect. Summary of the invention

[0004] Based on this, it is necessary to provide a sealing box and a stationary device that improve the above defects in order to solve the problems that the stationary device in the prior art is difficult to pressurize and has a poor stationary effect.

[0005] A sealed box, comprising:

[0006] Upper cover;

[0007] A lower cover is detachably connected to the upper cover and encloses the upper cover to form a receiving cavity for receiving the workpiece; a sealing groove surrounding the receiving cavity is formed on one side of the lower cover facing the upper cover; and

[0008] An elastic sealing ring, sealingly disposed in the sealing groove, and comprising a sealing end in sealing contact with the upper cover and a deformation end accommodated in the sealing groove;

[0009] Wherein, the lower cover is provided with an inflation hole connected to the sealing groove, and the deformable end is deformed and squeezed against the groove wall of the sealing groove under the action of the airflow filled into the sealing groove through the inflation hole, thereby generating a force pushing the sealing end to move toward the upper cover.

[0010] In one embodiment, the deformation end is provided with a groove, and the deformation end includes two elastic parts located on both sides of the groove; the inflation hole is arranged toward the groove, and the two elastic parts are tightly fitted with the groove wall of the sealing groove under the action of the airflow filled into the groove through the inflation hole.

[0011] In one embodiment, the portion of the elastic sealing ring accommodated in the sealing groove fits against the groove wall of the sealing groove.

[0012] A stationary device, comprising a support frame, a plurality of transverse support plates, a plurality of clamping jaw assemblies and a sealing box as described in any of the above embodiments, wherein the plurality of transverse support plates are fixedly connected to the support frame and enclose a receiving position for receiving the upper cover and the lower cover, and each of the transverse support plates is provided with at least one clamping jaw assembly;

[0013] Each of the clamping jaw assemblies is used to clamp the upper cover and the lower cover in the accommodating position.

[0014] In one embodiment, each of the clamping jaw assemblies includes a mounting frame, a clamping jaw and a driving member, wherein the mounting frame is disposed on the transverse support plate, the clamping jaw can be connected to the mounting frame toward or away from the accommodating position, and the driving member is transmission-connected to the clamping jaw.

[0015] In one embodiment, each of the clamping jaw assemblies further comprises a floating structure, the floating structure being disposed on the transverse support plate and having a floating end capable of floating along a first direction perpendicular to the moving direction of the clamping jaw under the action of an external force;

[0016] The mounting frame is fixedly connected to the floating end.

[0017] In one embodiment, each of the transverse support plates is provided with a guide hole penetrating therethrough along the first direction;

[0018] Each of the floating structures includes a guide column, an elastic member and a limit member. The guide column passes through the corresponding guide hole, and one end of the guide column serves as the floating end and is fixedly connected to the mounting frame. The other end of the guide column is transmission-connected to the limit member, and the elastic member abuts between the limit member and the cross support plate.

[0019] In one embodiment, each of the clamping jaw assemblies further comprises a sliding plate, the clamping jaw is fixedly connected to the sliding plate, and the sliding plate is provided with a sliding rail;

[0020] The mounting frame is provided with a sliding block, and the sliding block is slidably connected to the sliding rail;

[0021] The driving member is fixedly mounted on the sliding plate, and a driving end of the driving member is connected to the mounting frame.

[0022] In one embodiment, a plurality of clamping jaws are fixedly connected to the sliding plate of each clamping jaw assembly.

[0023] In one of the embodiments, anti-wear gaskets are provided at positions of the upper cover and the lower cover corresponding to the clamping jaws.

[0024] The sealing box and the static device are detachably connected with the lower cover and the upper cover to enclose a receiving chamber, and the battery after injection is placed in the receiving chamber to allow the electrolyte to fully infiltrate. During the static process, an inert gas can be filled into the receiving chamber to increase the pressure in the receiving chamber, so that the battery is in a high-pressure environment, which is conducive to increasing the infiltration rate.

[0025] However, during the process of inflating and pressurizing the accommodating cavity, a first pressure away from the upper cover is applied to the lower cover under the action of the air pressure. In order to prevent the first pressure from affecting the sealing between the lower cover and the upper cover, the air filling hole on the lower cover can be used to inflate the sealing groove, so that the deformable end of the elastic sealing ring is deformed and squeezes the groove wall of the sealing groove (that is, the deformable end is tightly fitted with the groove wall of the sealing groove), and at the same time, a force is generated to push the sealing end toward the upper cover, thereby eliminating the influence of the first pressure on the sealing and ensuring that the sealing between the upper cover and the lower cover is not damaged. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 It is a structural schematic diagram of a sealing box in one embodiment of the present invention;

[0027] Figure 2 for Figure 1 The cross-sectional view along the BB direction;

[0028] Figure 3 for Figure 2 A partial enlarged view of point D in the middle;

[0029] Figure 4 for Figure 1 A top view of the lower cover of the sealing box shown;

[0030] Figure 5 is a schematic structural diagram of a stationary device in one embodiment of the present invention;

[0031] Figure 6 for Figure 5 The stationary device is shown in a cross-sectional view along the AA direction. DETAILED DESCRIPTION

[0032] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the specific embodiments of the present invention are described in detail below in conjunction with the accompanying drawings. In the following description, many specific details are set forth to facilitate a full understanding of the present invention. However, the present invention can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without violating the connotation of the present invention, so the present invention is not limited by the specific embodiments disclosed below.

[0033] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0034] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of the present invention, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0035] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0036] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being "above", "above" or "above" a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being "below", "below" or "below" a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0037] It should be noted that when an element is referred to as being "fixed to" or "disposed on" another element, it may be directly on the other element or there may be a central element. When an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be a central element at the same time. The terms "vertical", "horizontal", "upper", "lower", "left", "right" and similar expressions used herein are for illustrative purposes only and are not intended to be the only implementation method.

[0038] See also Figure 1 , Figure 2 and Figure 3 As shown, a sealed box provided by one embodiment of the present invention includes an upper cover 10, a lower cover 20 and an elastic sealing ring 30. The lower cover 20 is detachably connected to the upper cover 10, and is enclosed with the upper cover 10 to form a receiving chamber a for receiving a workpiece. A sealing groove 21 surrounding the receiving chamber a is provided on the side of the lower cover 20 facing the upper cover 10, and the elastic sealing ring 30 is arranged in the sealing groove 21 to seal the gap between the upper cover 10 and the lower cover 20. The elastic sealing ring 30 includes a sealing end 32 in sealing contact with the upper cover 10, and a deformation end 33 received in the sealing groove 21. Optionally, the workpiece can be a battery that needs to be left still, and of course it can also be other products that need to be left still in the receiving chamber a, which is not limited here. For ease of understanding, this article takes a battery as an example for explanation.

[0039] Among them, the lower cover 20 is provided with an inflation hole 22 connected to the sealing groove 21. The deformation end 33 is deformed under the action of the airflow filled into the sealing groove 21 through the inflation hole 22 and squeezes the groove wall of the sealing groove 21, and generates a force to push the sealing end 32 of the elastic sealing ring 30 to move toward the upper cover 10, so as to keep the deformation end 33 in close contact with the groove wall of the sealing groove 21, and the sealing end 32 in close contact with the upper cover 10, ensuring that the elastic sealing ring 30 seals the gap between the upper cover 10 and the lower cover 20.

[0040] In the sealed box, the lower cover 20 and the upper cover 10 are detachably connected to form a housing chamber a, and the battery after injection is placed in the housing chamber a to allow the electrolyte to fully infiltrate. During the static process, an inert gas can be filled into the housing chamber a to increase the pressure in the housing chamber a, so that the battery is in a high-pressure environment, which is conducive to increasing the infiltration rate.

[0041] However, during the process of inflating and pressurizing the accommodating chamber a, a first pressure away from the upper cover 10 is applied to the lower cover 20 under the action of the air pressure. In order to prevent the first pressure from affecting the sealing between the lower cover 20 and the upper cover 10, the air filling hole 22 on the lower cover 20 can be used to inflate the sealing groove 21, so that the deformed end 33 of the elastic sealing ring 30 is deformed and squeezes the groove wall of the sealing groove 21 (that is, the deformed end 33 is tightly fitted with the groove wall of the sealing groove 21), and at the same time, a force is generated to push the sealing end 32 to move toward the upper cover 10, so that the sealing end 32 is tightly fitted with the upper cover 10, thereby eliminating the influence of the first pressure on the sealing, and ensuring that the sealing between the upper cover 10 and the lower cover 20 is not damaged.

[0042] It is understandable that in order to inflate the accommodating chamber a, an air hole connected to the accommodating chamber a may be opened on the upper cover 10 or the lower cover 20, and the air hole is connected to an external air source so that the inert gas can be filled into the accommodating chamber a using the external air source.

[0043] Specifically in the embodiment, the lower cover 20 has a fixing position for fixing the battery on one side facing the accommodating cavity a. Thus, after the battery is filled with liquid, the battery is fixed on the fixing position of the lower cover 20, and then the lower cover 20 is covered and connected to the upper cover 10, so that the battery is allowed to rest in the accommodating cavity a. After the battery has rested, the lower cover 20 is separated from the upper cover 10, and then the battery is removed from the lower cover 20.

[0044] Specifically in the embodiment, the deformation end 33 is provided with a groove 31, and the deformation end 33 includes two elastic parts 331, and the two elastic parts 331 are located on both sides of the groove 31. The inflation hole 22 is arranged toward the groove 31, so that the airflow filled by the inflation hole 22 enters the groove 31. The two elastic parts 331 are deformed in a direction away from each other under the action of the airflow filled into the groove 31 by the inflation hole 22, and are tightly fitted with the groove wall of the sealing groove 21, and at the same time, a force is generated to push the sealing end 32 to move toward the upper cover 10, thereby eliminating the influence of the above-mentioned first pressure on the sealing between the upper cover 10 and the lower cover 20, and avoiding the destruction of the sealing between the upper cover 10 and the lower cover 20 under the action of the first pressure.

[0045] Specifically in the embodiment, the portion of the elastic sealing ring 30 accommodated in the sealing groove 21 fits with the groove wall of the sealing groove 21. The sealing end 32 of the elastic sealing ring 30 fits with the upper cover 10. In this way, in the initial state (i.e., when the sealing groove 21 is not inflated), since the portion of the elastic sealing ring 30 accommodated in the sealing groove 21 (the portion includes the deformed end 33) fits with the groove wall of the sealing groove 21, the sealing end 32 of the elastic sealing ring 30 fits with the upper cover 10, thereby achieving a sealing effect. When the sealing groove 21 is inflated, the portion of the elastic sealing ring 30 accommodated in the sealing groove 21 fits more closely with the groove wall of the sealing groove 21, further improving the sealing effect.

[0046] Please continue to see Figure 3 As shown, in the embodiment, the sealing groove 21 is formed by two groove walls and a bottom wall connected between the two groove walls. The groove 31 of the deformation end 33 is arranged toward the bottom wall, and one end of the inflation hole 22 penetrates the bottom wall of the sealing groove 21, so that the airflow filled by the inflation hole 22 can enter the groove 31, thereby causing the two elastic parts 331 of the deformation end 33 to deform in a direction away from each other, so as to fit closely to the corresponding two groove walls respectively. The other end of the inflation hole 22 penetrates the side of the lower cover 20 away from the upper cover 10, so as to facilitate connection with an external air source.

[0047] Based on the above-mentioned sealed box, the present invention further provides a stationary device, comprising the sealed box as described in any of the above embodiments.

[0048] See also Figure 5 and Figure 6 As shown, in the embodiment of the present invention, the static device further includes a support frame 40, a plurality of transverse support plates 41 and a plurality of clamping jaw assemblies 50, wherein the plurality of transverse support plates 41 are fixedly connected to the support frame 40, and the plurality of transverse support plates 41 enclose a receiving position (not shown) for receiving the upper cover 10 and the lower cover 20, and at least one clamping jaw assembly 50 is arranged on each transverse support plate 41. Each clamping jaw assembly 50 is used to clamp the upper cover 10 and the lower cover 20 in the receiving position, so that the upper cover 10 and the lower cover 20 are covered and fastened to each other. In this way, after the battery is filled with liquid, the battery is fixed at the fixed position of the lower cover 20, and then the lower cover 20 is covered on the upper cover 10, and the upper cover 10 and the lower cover 20 are clamped by using a plurality of clamping jaw assemblies 50, so that the battery is static in the receiving chamber a. When the battery is static, each clamping jaw assembly 50 releases the clamping of the lower cover 20 and the upper cover 10, and then the battery is removed from the lower cover 20.

[0049] In some embodiments, each clamping jaw assembly 50 includes a mounting frame 51, a clamping jaw 52 and a driving member 53. The mounting frame 51 is arranged on the horizontal support plate 41, and the clamping jaw 52 can be connected to the mounting frame 51 to move closer to or farther from the accommodation position. The driving member 53 is connected to the clamping jaw 52 in a transmission manner, and is used to drive the clamping jaw 52 to move closer to or farther from the accommodation position relative to the mounting frame 51. In this way, when the clamping jaw assembly 50 is required to clamp the upper cover 10 and the lower cover 20, the driving member 53 drives the clamping jaw 52 to move closer to the accommodation position, so that the clamping jaw 52 gradually approaches the upper cover 10 and the lower cover 20 in the accommodation position until the clamping jaw 52 clamps the upper cover 10 and the lower cover 20. When it is necessary to release the clamping of the upper cover 10 and the lower cover 20, the driving member 53 drives the clamping jaw 52 to move away from the accommodation position until the clamping jaw 52 is completely separated from the upper cover 10 and the lower cover 20, thereby releasing the clamping of the upper cover 10 and the lower cover 20. Optionally, the driving member 53 can be a cylinder.

[0050] Specifically in the embodiment, each clamping jaw assembly 50 further includes a floating structure (not marked in the figure), which is arranged on the horizontal support plate 41 and has a floating end (not marked in the figure) that can float in a first direction perpendicular to the moving direction of the clamping jaw 52 under the action of an external force. The mounting frame 51 is fixedly connected to the floating end, so that the clamping jaw 52 can float along the first direction following the floating end. Due to the processing and assembly errors of various components (such as the support frame 40), each clamping jaw 52 is not completely aligned with the upper cover 10 and the lower cover 20 in the first direction, which will cause the clamping jaw 52 to be unable to clamp the upper cover 10 and the lower cover 20. In this embodiment, due to the setting of the floating structure, in the process of the driving member 53 driving the lower clamping jaw 52 to move toward the upper cover 10 and the lower cover 20 in the accommodating position, the clamping jaw 52 can adaptively float along the first direction under the action of the force generated by contacting the upper cover 10 and the lower cover 20, so as to ensure that the upper cover 10 and the lower cover 20 enter the clamping jaw 52 and are clamped by the clamping jaw 25.

[0051] Furthermore, each transverse support plate 41 is provided with a guide hole that penetrates the transverse support plate 41 along the first direction. Each floating structure includes a guide column 55, an elastic member 56 and a limit member 57. The guide column 55 penetrates the corresponding guide hole, and one end of the guide column 55 serves as a floating end and is fixedly connected to the mounting frame 51, so that the mounting frame 51 moves along the guide hole (i.e., the first direction) with the guide column 55. The other end of the guide column 55 is transmission-connected to the limit member 57, and the elastic member 56 abuts between the limit member 57 and the transverse support plate 41, so that when the clamping jaw 52 moves along the first direction with the guide column 55, the elastic member 56 provides a restoring force to drive the clamping jaw 52 to return to its original position. Optionally, the elastic member 56 can be a spring.

[0052] Specific to Figure 5 and Figure 6 In the illustrated embodiment, when the clamping jaws 52 are high, the clamping jaws 52 will float downward (compress the elastic member 56) when clamping the upper cover 10 and the lower cover 20, so that the upper cover 10 and the lower cover 20 enter the clamping jaws 52 and are clamped. When the clamping jaws 52 are low, the clamping jaws 52 will float upward (the elastic member 56 extends) when clamping the upper cover 10 and the lower cover 20, so that the upper cover 10 and the lower cover 20 enter the clamping jaws 52 and are clamped.

[0053] It should be noted that each floating structure may include a plurality of (ie, two or more) guide pillars 55 and a plurality of (ie, two or more) elastic members 56, which is beneficial to improving the stability and reliability of the floating structure.

[0054] In some embodiments, each clamping jaw assembly 50 further includes a sliding plate 54, and the clamping jaw 52 is fixedly connected to the sliding plate 54. The sliding plate 54 is provided with a slide rail 541. The mounting frame 51 is provided with a slider 511, and the slider 511 is slidably matched with the slide rail 541, so that the slide rail 541 and the slider 511 are used to guide the movement of the sliding plate 54 relative to the mounting frame 51, so as to realize the movement of the clamping jaw 52 toward or away from the accommodating position.

[0055] Furthermore, the driving member 53 of each clamping jaw assembly 50 is fixedly mounted on the corresponding sliding plate 54, and the driving end of the driving member 53 is connected to the mounting frame 51, thereby driving the sliding plate 54 to move relative to the mounting frame 51, thereby driving the clamping jaw 52 on the sliding plate 54 to move closer to or away from the accommodating position.

[0056] Furthermore, a plurality of (i.e., two or more) clamping jaws 52 are fixedly connected to the sliding plate 54 of each clamping jaw assembly 50. Preferably, two clamping jaws 52 are fixedly connected to the sliding plate 54 of each clamping jaw assembly 50, and the two clamping jaws 52 are symmetrically arranged on both sides of the driving member 53, so that the clamping jaw assembly 50 is subjected to more balanced force during the process of clamping the upper cover 10 and the lower cover 20, and the operation is more stable and reliable.

[0057] Specifically in the embodiment, the upper cover 10 and the lower cover 20 are provided with anti-wear gaskets 23 (see Figure 4 ), so that when the clamping claws 52 clamp the upper cover 10 and the lower cover 20, they do not directly contact with the upper cover 10 and the lower cover 20, but contact with the corresponding anti-wear gaskets 23, thereby avoiding wear on the upper cover 10 and the lower cover 20 and improving the service life.

[0058] Specific to Figures 3 to 6 In the illustrated embodiment, the upper cover 10 and the lower cover 20 are rectangular in shape, and the transverse support plates 41 include four, and the four transverse support plates 41 are arranged to form a rectangular accommodation position to accommodate the upper cover 10 and the lower cover 20. The clamping claw assemblies 50 on the four transverse support plates 41 are respectively used to clamp the four sides of the upper cover 10 and the lower cover 20. Further, two clamping claw assemblies 50 are installed on each transverse support plate 41.

[0059] It should be noted that the stationary device also includes a lower cover transporting mechanism, which is used to transport the lower cover 20 to the accommodating position and cover it with the upper cover 10 in the accommodating position. In this way, first, the battery after injection is installed in the fixed position of the lower cover 20. Then, the lower cover transporting mechanism transports the lower cover 20 to the accommodating position and covers it with the upper cover 10 in the accommodating position. Then, the driving member 53 of each clamping jaw assembly 50 drives the clamping jaw 52 to clamp the upper cover 10 and the lower cover 20. Specifically, the lower cover transporting mechanism can be a robot, etc., which is not limited here.

[0060] The technical features of the above-described embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0061] The above-mentioned embodiments only express several implementation methods of the present invention, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the invention patent. It should be pointed out that, for ordinary technicians in this field, several variations and improvements can be made without departing from the concept of the present invention, and these all belong to the protection scope of the present invention. Therefore, the protection scope of the patent of the present invention shall be subject to the attached claims.

Claims

1. A static device, characterized in that: The stationary device comprises a support frame, a plurality of transverse support plates, a plurality of clamping jaw assemblies and a sealing box; Sealed box includes: Upper cover; A lower cover is detachably connected to the upper cover and encloses the upper cover to form a receiving cavity for receiving the workpiece; a sealing groove surrounding the receiving cavity is formed on one side of the lower cover facing the upper cover; and An elastic sealing ring, sealingly disposed in the sealing groove, and comprising a sealing end in sealing contact with the upper cover and a deformation end accommodated in the sealing groove; The lower cover is provided with an air filling hole connected to the sealing groove, and the deformable end is deformed under the action of the airflow filled into the sealing groove through the air filling hole to squeeze the groove wall of the sealing groove, and generate a force to push the sealing end to move toward the upper cover; The plurality of transverse support plates are fixedly connected to the support frame and enclose to form a receiving position for receiving the upper cover and the lower cover, and each of the transverse support plates is provided with at least one clamping claw assembly for clamping the upper cover and the lower cover; The sealing groove is formed by two groove walls and a bottom wall connected between the two groove walls.

2. The sealed box according to claim 1, characterized in that: The deformation end is provided with a groove, and the deformation end includes two elastic parts located on both sides of the groove; the inflation hole is arranged toward the groove, and the two elastic parts are tightly fitted with the groove wall of the sealing groove under the action of the airflow filled into the groove through the inflation hole.

3. The sealed box according to claim 1, characterized in that: The portion of the elastic sealing ring accommodated in the sealing groove is in contact with the groove wall of the sealing groove.

4. The stationary device according to claim 1, characterized in that: Each of the clamping jaw assemblies comprises a mounting frame, a clamping jaw and a driving member. The mounting frame is arranged on the transverse support plate. The clamping jaw can be connected to the mounting frame to move closer to or farther from the accommodating position. The driving member is in transmission connection with the clamping jaw.

5. The stationary device according to claim 4, characterized in that: Each of the clamping jaw assemblies further comprises a floating structure, which is disposed on the transverse support plate and has a floating end capable of floating along a first direction perpendicular to the moving direction of the clamping jaw under the action of an external force; The mounting frame is fixedly connected to the floating end.

6. The stationary device according to claim 5, characterized in that: Each of the transverse support plates is provided with a guide hole penetrating therethrough along the first direction; Each of the floating structures includes a guide column, an elastic member and a limit member. The guide column passes through the corresponding guide hole, and one end of the guide column serves as the floating end and is fixedly connected to the mounting frame. The other end of the guide column is transmission-connected to the limit member, and the elastic member abuts between the limit member and the cross support plate.

7. The stationary device according to claim 4, characterized in that: Each of the clamping jaw assemblies further comprises a sliding plate, the clamping jaw is fixedly connected to the sliding plate, and the sliding plate is provided with a slide rail; The mounting frame is provided with a sliding block, and the sliding block is slidably connected to the sliding rail; The driving member is fixedly mounted on the sliding plate, and a driving end of the driving member is connected to the mounting frame.

8. The stationary device according to claim 7, characterized in that: A plurality of clamping jaws are fixedly connected to the sliding plate of each clamping jaw assembly.

9. The stationary device according to claim 4, characterized in that: Anti-wear gaskets are arranged at positions of the upper cover and the lower cover corresponding to the clamping jaws.

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