A self-weight pressure-holding mechanism

Abstract

The present invention relates to a self-weight pressure-holding mechanism, a central pressure-holding rod; at least two circumferential pressure-holding blocks arranged around the outer periphery of the central pressure-holding rod; and a central counterweight block and at least two circumferential counterweight blocks; wherein, the central counterweight block presses down on the top end of the central pressure-holding rod so that the central pressure-holding rod presses down on the central area of the workpiece; each circumferential counterweight block presses down on the top end of a corresponding circumferential pressure-holding block so that the circumferential pressure-holding block presses down on the circumferential area of the workpiece, and through sub-region pressure-holding, the pressure-holding pressure requirements of different regions of the workpiece are met.

Description

Technical Field

[0001] The invention relates to the field of non-standard automation, and in particular to a self-weight pressure-maintaining mechanism. Background Art

[0002] In the field of non-standard automation, it is well known to use a pressure-maintaining method to ensure the quality of lamination. In the process of studying and implementing workpiece pressure-maintaining, the inventors found that the pressure-maintaining mechanism in the prior art has at least the following problems:

[0003] First, the surface shapes of some workpieces are more complicated or precision devices are embedded on the surface of the workpieces, and the pressing surface of the pressure-holding head is required to be processed to meet the shape of the workpiece. This makes the pressure head shape complex, difficult to process and has a high scrap rate. Secondly, the holding pressure required in different areas of the pressed workpiece should meet the pressure-holding needs of the workpiece, but the existing pressure-holding head can only exert a certain pressing force on the pressed workpiece, and it is difficult to adjust the holding pressure in different areas according to the pressure-holding needs of the workpiece, resulting in damage to some areas of the workpiece after being subjected to a large holding pressure.

[0004] In view of this, it is necessary to develop a self-weight pressure-maintaining mechanism to solve the above problems. Summary of the invention

[0005] In view of the shortcomings of the prior art, the main purpose of the present invention is to provide a self-weight pressure-maintaining mechanism, which maintains pressure in different areas of the workpiece through a central pressure-maintaining rod and circumferential pressure-maintaining blocks, thereby simplifying the shape of a single pressure-maintaining head and facilitating the adjustment of the pressure-maintaining pressure according to the pressure-maintaining pressure required by the block to meet the pressure-maintaining pressure requirements of the block.

[0006] Another object of the present invention is to provide a self-weight pressure-maintaining mechanism, which is supported by a pressure-maintaining support frame, and the pushing assembly lifts the workpiece to maintain pressure. The pressure-maintaining mechanism can be set up on a transmission line to facilitate line operation.

[0007] The technical solution of the present invention is summarized as follows:

[0008] The present invention provides a self-weight pressure-maintaining mechanism, comprising:

[0009] Center pressure rod;

[0010] at least two circumferential pressure retaining blocks arranged around the outer circumference of the central pressure retaining rod; and

[0011] A central counterweight and at least two circumferential counterweights;

[0012] Among them, the central counterweight presses down on the top of the central pressure-holding rod, causing the central pressure-holding rod to press down on the central area of the workpiece; each circumferential counterweight presses down on the top of a corresponding circumferential pressure-holding block, causing the circumferential pressure-holding block to press down on the circumferential area of the workpiece.

[0013] Preferably, the central counterweight and the central pressure-holding rod form a central pressure-holding assembly, and each circumferential counterweight and a corresponding circumferential pressure-holding block form a corresponding circumferential pressure-holding assembly. The weight of the central pressure-holding assembly is different from the weight of any one of the circumferential pressure-holding assemblies.

[0014] Preferably, the weights of any two circumferential pressure-holding assemblies are different from each other.

[0015] Preferably, a pressure-holding support frame is further included. A pressure-holding through hole penetrating the upper and lower surfaces thereof is provided at the top of the pressure-holding support frame. A pushing assembly is provided in the pressure-holding support frame directly below the pressure-holding through hole. The workpiece to be pressure-held is pushed towards the top of the pressure-holding support frame by the pushing assembly, and the area to be pressure-held of the workpiece is exposed in the pressure-holding through hole.

[0016] Preferably, a pressure-holding guiding assembly is fixedly connected to the pressure-holding support frame and is arranged above the pressure-holding through hole;

[0017] The pressure-holding guiding assembly includes two guiding vertical plates. The two guiding vertical plates are parallel and spaced apart to form a guiding space therebetween. The central counterweight and the circumferential counterweights are arranged in the guiding space and are slidably connected to the inner sides of the guiding vertical plates in the vertical direction.

[0018] Preferably, the central counterweight includes:

[0019] a central counterweight support frame, which is supported by the central pressure-holding rod and is slidably mated with the inner side of the guiding vertical plate; and

[0020] at least one central counterweight weight, which is arranged on the central counterweight support frame.

[0021] Preferably, the circumferential counterweight includes:

[0022] a circumferential counterweight support frame, which is supported by the circumferential pressure-holding block and is slidably mated with the inner side of the guiding vertical plate; and

[0023] at least one circumferential counterweight weight, which is arranged on the circumferential counterweight support frame.

[0024] Preferably, a central reset component is elastically connected between the central counterweight and the top of the pressure-holding support frame, and a circumferential reset component is elastically connected between the circumferential counterweight and the top of the pressure-holding support frame.

[0025] Preferably, a limiting block is erected in the guiding space, and the limiting block is composed of a lower cross beam, an upper cross beam and support columns connecting the lower cross beam and the upper cross beam to form an I shape;

[0026] The upper cross beam is used to receive the central reset component so that the upper cross beam supports the central counterweight block;

[0027] The lower cross beam is used to receive the circumferential reset component so that the lower cross beam supports the circumferential counterweight block.

[0028] Preferably, there are two groups of circumferential pressure-holding blocks, which are symmetrically arranged with respect to the central pressure-holding rod.

[0029] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0030] The present invention provides a self-weight pressure-holding mechanism, which presses different areas of the workpiece through the central pressure-holding rod and the circumferential pressure-holding blocks, performs pressure-holding in blocks, simplifies the shape of a single pressure-holding head, and at the same time, is convenient to adjust the pressure-holding pressure according to the required pressure-holding pressure of the block to meet the requirements of the block for the pressure-holding pressure. The self-weight pressure-holding mechanism has a simple structure, reliable and convenient operation.

[0031] The above description is only an overview of the technical solution of the present invention. In order to be able to understand the technical means of the present invention more clearly and implement it according to the content of the specification, the following takes the preferred embodiments of the present invention and combines the drawings to describe in detail as follows. The specific implementation manners of the present invention are given in detail by the following embodiments and their accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] The drawings described herein are used to provide a further understanding of the present invention, form a part of this application, and the schematic embodiments and descriptions of the present invention are used to explain the present invention and do not constitute an improper limitation to the present invention. In the drawings:

[0033] Figure 1 is a three-dimensional structural diagram of the present invention in an embodiment;

[0034] Figure 2 is an exploded view of the present invention in an embodiment;

[0035] Figure 3 is a three-dimensional structural diagram of the pressing head of the present invention in an embodiment;

[0036] Figure 4 is a cross-sectional view of the pressing head of the present invention in an embodiment;

[0037] Figure 5 is an exploded view of the pressing head of the present invention in an embodiment;

[0038] Figure 6Partial schematic view of the indenter body in an embodiment of the present invention;

[0039] Figure 7 Schematic perspective view of the limit block in an embodiment of the present invention;

[0040] Figure 8 Schematic view of the structure of the pushing component and the workpiece in an embodiment of the present invention

[0041] Figure 9 Schematic perspective view of the workpiece in an embodiment of the present invention;

[0042] Figure 10 is Figure 9 Partial enlarged schematic view of.

[0043] Explanation of reference numerals:

[0044] 65, Pressing mechanism;

[0045] 651, First pressure-holding block; 6511, Protrusion pressing block;

[0046] 652, Second pressure-holding block; 6521, First pressing block; 6522, Second pressing block;

[0047] 653, Central pressure-holding rod; 6531, Recess pressing block;

[0048] 654, Calibration plate;

[0049] 655, Pressing rod cavity;

[0050] 656, Bearing plate;

[0051] 6561, Load-carrying guide post; 6562, Counterweight;

[0052] 657, Limit block; 6571, Lower cross beam; 6572, Upper cross beam; 6573, Buffer block;

[0053] 658, Indenter support;

[0054] 6581, Pressure-holding support frame; 65811, Pressure-holding through hole; 6582, Positioning rod;

[0055] 659, Pressure-holding guiding component;

[0056] 68, Pushing component; 681, Lifting cylinder; 682, Pushing plate; 6821, Limit block;

[0057] 69, Workpiece;

[0058] 691, Base; 6911, Ring-shaped protrusion;

[0059] 692. Assembly parts; 6921. Outer edge convex part; 6922. Central concave part; 6923. Part body

[0060] 694. Tray; 6941. Positioning hole; 6542. Limit groove Detailed implementation manner

[0061] The following further elaborates on the present invention in conjunction with the accompanying drawings. The foregoing and other objects, features, aspects, and advantages of the present invention will become more apparent, enabling those skilled in the art to implement it based on the description in the specification. In the drawings, for clarity, the shapes and dimensions may be enlarged, and the same reference numerals will be used throughout all the figures to indicate the same or similar components. In the following description, terms such as center, thickness, height, length, front, back, rear, left, right, top, bottom, upper, lower, etc. are based on the orientation or positional relationship shown in the drawings. In particular, "height" corresponds to the dimension from the top to the bottom, "width" corresponds to the dimension from the left to the right, and "depth" corresponds to the dimension from the front to the back. These relative terms are for convenience of description and generally do not require a specific orientation. Terms related to attachment, connection, etc. (e.g., "connect" and "attach") refer to the relationship in which these structures are directly or indirectly fixed or attached to each other through an intermediate structure, as well as a movable or rigid attachment or relationship, unless otherwise explicitly stated

[0062] Next, in combination with the accompanying drawings and the specific implementation manner, the present invention is further described. It should be noted that, on the premise of no conflict, the following-described embodiments or technical features can be arbitrarily combined to form new embodiments. It should be understood that terms such as "having", "comprising", and "including" used herein do not exclude the presence or addition of one or more other elements or their combinations

[0063] As Figure 4 、 5 shown, the present invention provides a self-weight pressure-holding mechanism, including a pressing mechanism 65, and the pressing mechanism 65 includes

[0064] A central pressure-holding rod 653

[0065] At least two circumferential pressure-holding blocks arranged around the outer periphery of the central pressure-holding rod 653; and

[0066] A central counterweight block and at least two circumferential counterweight blocks

[0067] Among them, the central counterweight block presses down on the top of the central pressure maintaining rod 653 so that the central pressure maintaining rod 653 is pressed down on the central area of the workpiece 69; each circumferential counterweight block presses down on the top of a corresponding circumferential pressure maintaining block so that the circumferential pressure maintaining blocks are pressed down on the circumferential area of the workpiece 69; specifically, two groups of circumferential pressure maintaining blocks are provided, and are arranged symmetrically about the central pressure maintaining rod 653.

[0068] Compared with the existing pressure-maintaining mechanism and the overall pressure head structure, the present invention adopts a central pressure-maintaining rod 653 and circumferential pressure-maintaining blocks to maintain pressure on different areas on the workpiece 69, and maintains pressure in blocks, which simplifies the shape of a single pressure-maintaining head and facilitates the processing of the pressure-maintaining head. At the same time, since the pressure-maintaining head is also subjected to the reaction force of the workpiece during the pressing process, the pressure-maintaining head is prone to wear after long-term use, especially the slender protrusions on the pressure-maintaining head, which are prone to breakage. When the existing integrated pressure-maintaining head is damaged, it needs to be completely replaced. In the present invention, only the damaged central pressure-maintaining rod 653 or the circumferential pressure-maintaining block needs to be replaced, saving costs.

[0069] In a specific embodiment, reference Figures 8 - 10 It is shown in detail that the workpiece 69 includes a base 691 and an assembly part 692 assembled on the base 691, the base 691 is provided with an annular protrusion 6911, the assembly part 692 is assembled on the annular protrusion 6911, and the assembly part 692 includes: a part body 6923, one side of which is in contact with the base 691; the other side is pressed with the pressure head, and is provided with an outer edge protrusion 6921, which is a continuous protrusion arranged at the edge position of the part body 6923; and a central concave part 6922, which is a notch arranged at the center position of the part body 6923 and is concave inwardly;

[0070] Reference Figure 5 , 6 It can be noted that the circumferential pressure-maintaining block includes a first pressure-maintaining block 651 and a second pressure-maintaining block 652. The outer edge contour formed by the first pressure-maintaining block 651 and the second pressure-maintaining block 652 corresponds to the outer edge of the assembly part 692. When the first pressure-maintaining block 651 and the second pressure-maintaining block 652 are assembled, a hollow pressure rod cavity 655 is formed inside the whole. The central pressure-maintaining rod 653 is arranged in the pressure rod cavity 655.

[0071] A convex first pressing block 6521 and a convex second pressing block 6522 are provided on one end of the pressing surface of the second pressure-maintaining block 652; the first pressing block 6521 and the second pressing block 6522 are pressed at different positions on the part body 6923, so that a relatively concave portion between the first pressing block 6521 and the second pressing block 6522 forms a clearance space, thereby avoiding a partial area on the part body 6923;

[0072] One end of the pressing surface of the first pressure-holding block 651 is provided with a convex block 6511. The convex block 6511 is arranged along the outer edge of the first pressure-holding block 651, and the position of the convex block 6511 corresponds to the first pressing block 6521 and the second pressing block 6522.

[0073] The circumferential pressure-holding block is provided with raised convex blocks to form a circumferential area of the pressed part, thereby avoiding the precision components arranged in the circumferential area and ensuring the pressure-holding quality.

[0074] Meanwhile, the central counterweight and the circumferential counterweight are correspondingly arranged on the central pressure-holding rod 653 and the circumferential pressure-holding block, so that the pressures on the central pressure-holding rod 653 and the circumferential pressure-holding block can be independently adjusted to facilitate the counterweight blocks 6562 arranged on the central pressure-holding rod 653 and the circumferential pressure-holding block to meet the requirements of the workpiece 69 for the pressure-holding pressure in different areas.

[0075] The central counterweight and the central pressure-holding rod 653 form a central pressure-holding assembly. Each circumferential counterweight and a corresponding circumferential pressure-holding block form a corresponding set of circumferential pressure-holding assemblies. The weight of the central pressure-holding assembly is different from the weight of any set of circumferential pressure-holding assemblies.

[0076] In a specific embodiment of the counterweight distribution adopted according to the above solution, the weight of the central counterweight is different from the weight of any circumferential counterweight. The pressure-holding pressures required in the central area and the circumferential area are different;

[0077] Furthermore, the weights of any two circumferential counterweights are different, and the pressure-holding pressures required in the circumferential area are all different, so as to facilitate the pressure-holding pressure to meet the different requirements of different areas.

[0078] Refer to again Figures 1 - 3 As shown, the pressure-holding mechanism further includes a pressure-holding support frame 6581. A pressure-holding through hole 65811 penetrating its upper and lower surfaces is opened at the top of the pressure-holding support frame 6581. A pushing component 68 is arranged in the pressure-holding support frame 6581 directly below the pressure-holding through hole 65811. The workpiece 69 to be pressure-held is pushed towards the top of the pressure-holding support frame 6581 by the pushing of the pushing component 68, and the area to be pressure-held of the workpiece 69 is exposed in the pressure-holding through hole 65811.

[0079] The pressure-holding support frame 6581 bears the components of the entire pressure-holding mechanism. The pushing component 68 jacks up the workpiece 69 to implement pressure-holding. The pressure-holding mechanism can be erected on the transmission production line, facilitating production line operation and realizing automation.

[0080] Furthermore, a pressure-holding guiding component 659 erected above the pressure-holding through hole 65811 is fixedly connected to the pressure-holding support frame 6581;

[0081] The directions of the central pressure-holding rod 653 and the circumferential pressure-holding block are limited by the pressure-holding guiding component 659;

[0082] The pushing component 68 jacks up the workpiece 69, causing the central pressure-holding rod 653 and the circumferential pressure-holding blocks to slide upward in a direction defined by the pressure-holding guiding component 659.

[0083] The pressure-holding guiding component 659 and the pressure-holding support frame 6581 are arranged one above the other in sequence to form a ram support 658. The ram support 658 is used to hold the components inside the pressure-holding mechanism. Specifically, the pushing component 68 is installed inside the pressure-holding support frame 6581, and the ram is arranged in the structural space where the pressure-holding guiding component 659 is installed.

[0084] The pressure-holding guiding component 659 includes two guiding vertical plates. The two guiding vertical plates are parallel and spaced apart to form a guiding space therebetween. The central counterweight and the circumferential counterweights are arranged in the guiding space and are both slidably connected to the inner sides of the guiding vertical plates in the vertical direction.

[0085] The central counterweight includes: a central counterweight support frame, which is supported by the central pressure-holding rod 653 and is slidably mated with the inner side of the guiding vertical plate; and at least one central counterweight weight, which is arranged on the central counterweight support frame;

[0086] The circumferential counterweights include: a circumferential counterweight support frame, which is supported by the circumferential pressure-holding blocks and is slidably mated with the inner side of the guiding vertical plate; and at least one circumferential counterweight weight, which is arranged on the circumferential counterweight support frame.

[0087] Now, reference will be made to Figure 4 as shown, where the structures of the central counterweight support frame and the circumferential counterweight support frame are the same as the bearing plate 656 in the figure; the central counterweight weights and the circumferential counterweight weights are the weight blocks 6562 in the figure;

[0088] In a preferred embodiment, the bearing plate 656 is installed with load-carrying guide posts 6561, and the weight blocks 6562 are sleeved on the load-carrying guide posts 6561. The position of the weight blocks 6562 is restricted by the load-carrying guide posts 6561, such that the weight blocks 6562 are placed on the bearing plate 656;

[0089] The pressure-holding guiding component 659 includes a guiding portion and a guide rail portion. The guiding portion of the pressure-holding guiding component 659 is connected to the bearing plate 656, and the guide rail portion is arranged on the pressure-holding support frame 6581. The movement direction of the bearing plate 656 is restricted by the sliding connection between the guiding portion and the guide rail portion.

[0090] An elastic connection center reset component is provided between the central counterweight and the top of the pressure-holding support frame 6581, and a circumferential reset component is elastically connected between the circumferential counterweight and the top of the pressure-holding support frame 6581. The central reset component can undergo elastic deformation, and the central reset component acts on the central counterweight so that the downward pressing pressure of the central counterweight in the vertical direction can be buffered, preventing damage to the workpiece caused by a sudden increase in the pressure-holding force during the pressure-holding process.

[0091] Among them, the central reset component and the circumferential reset component include a buffer block 6573. In a preferred embodiment, the buffer block 6573 is a spring; a limiting block 657 is installed inside the pressure-holding support frame 6581; the buffer block 6573 is built inside the limiting block 657; the buffer block 6573 is used to support the pressure-bearing plate 656, so that when the pressure-bearing plate 656 is pressed down, the buffer block 6573 is used for buffering to protect the components inside the self-weight pressure-holding mechanism;

[0092] Reference Figure 7 As shown, the limiting block 657 is in an I shape. The limiting block 657 includes a lower cross beam 6571 and an upper cross beam 6572. The lower cross beam 6571 and the upper cross beam 6572 are connected by a support column to form the support structure of the limiting block 657. The limiting block 657 is installed on the lower cross beam 6571 and the upper cross beam 6572;

[0093] The pressure-bearing plates 656 on the central pressure-holding rod 653 and the circumferential pressure-holding blocks are supported by the limiting blocks 657 on the lower cross beam 6571 and the upper cross beam 6572, reducing the floor area of the limiting blocks 657, thereby reducing the area of the mechanism and making the structure more compact.

[0094] The pressure-bearing plates 656 on the circumferential pressure-holding blocks are arranged in a staggered manner with the pressure-bearing plates 656 on the central pressure-holding rod 653. Now referring to Figure 4 , the pressure-bearing plate 656 on the central pressure-holding rod 653 is provided with a protrusion higher than the pressure-bearing plate 656 on the circumferential pressure-holding block, so that the pressure-bearing plate 656 on the central pressure-holding rod 653 is higher than the pressure-bearing plate 656 on the circumferential pressure-holding block. Through the staggered arrangement, the projection of the pressure-bearing plate 656 on the central pressure-holding rod 653 falls on the pressure-bearing plate 656 on the circumferential pressure-holding block, and there is no interference between them, and the pressure-holding work can be carried out normally. At the same time, the floor area of the structure is reduced, and the structure is more compact.

[0095] Reference Figure 5 As shown, a calibration plate 654 is provided at the top of the pressure-holding support frame 6581. The circumferential pressure-holding block is pressed against the calibration plate 654. The calibration plate 654 is used to equivalently replace the height of the workpiece 69 and is used for the embossing test before the pressure-holding work.

[0096] Verify the uniformity of the pressure of the indenter by pressing it against the calibration plate 654. Do not place the pressure test paper directly on the product. The purpose of the calibration plate 654 is to construct an equivalent replacement surface to test whether the indentation meets the pressing requirements of the workpiece 69, so as to ensure the accuracy of the pressure holding of the workpiece 69.

[0097] The top of the circumferential pressure holding block is provided with a skirt extending outward for stably receiving the bearing plate 656. The calibration plate 654 is provided with a groove. The shape of the receiving part formed by splicing the bearing plates on the two circumferential pressure holding blocks is the same as that of the groove, so that the bearing plates on the two circumferential pressure holding blocks are placed in the groove.

[0098] A positioning rod 6582 is installed on the top of the pressure holding support frame 6581 near the side of the pushing assembly 68. The base 691 is placed in the material tray 694. The material tray 694 is provided with a positioning hole 6941 corresponding to the positioning rod 6582. The material tray 694 is lifted by the pushing assembly 68 until the positioning rod 6582 is connected to the positioning hole 6941, so as to position the base 691 in the material tray 694, so that the indenter can be accurately pressed on the area to be pressed.

[0099] The pushing assembly 68 includes a push plate 682 and a lifting cylinder 681 for driving the push plate 682. The push plate 682 is pushed by the lifting cylinder 681 to receive the base 691. In order to accurately connect the push plate 682 to the base 691, a pushing block is provided on the push plate 682, and a limiting groove 6542 is provided at the bottom of the base 691. The position of the base 691 is restricted by the pushing block extending into the limiting groove 6542.

[0100] At the same time, the pressure holding mechanism provided by the present invention should also include a power supply device, a transfer device, and a detection and control system in order to adjust the shape of the workpiece part. The corresponding action mechanisms should all have corresponding power mechanisms, etc. The beneficial effects of the corresponding mechanisms will not be elaborated here.

[0101] Although the embodiments of the present invention have been disclosed above, it is not limited to the applications listed in the specification and embodiments. It can be fully applied to various fields suitable for the present invention. For those familiar with the field, other modifications can be easily made. Therefore, without departing from the general concept defined by the claims and the equivalent scope, the present invention is not limited to specific details.

Claims

1. A self-weight pressure-holding mechanism, characterized in that, Comprising: A central pressure-holding rod (653); At least two circumferential pressure-holding blocks arranged around the outer periphery of the central pressure-holding rod (653); And A central counterweight block and at least two circumferential counterweight blocks; Wherein, the central counterweight block presses down on the top end of the central pressure-holding rod (653) such that the central pressure-holding rod (653) presses down on the central region of the workpiece (69); each circumferential counterweight block presses down on the top end of a corresponding circumferential pressure-holding block such that the circumferential pressure-holding block presses down on the circumferential region of the workpiece (69); the central counterweight block and the central pressure-holding rod (653) form a central pressure-holding assembly, each circumferential counterweight block and a corresponding circumferential pressure-holding block form a corresponding set of circumferential pressure-holding assemblies, and the weight of the central pressure-holding assembly is different from the weight of any set of the circumferential pressure-holding assemblies; It further includes a pressure-holding support frame (6581), a pressure-holding through-hole (65811) penetrating through its upper and lower surfaces is provided at the top of the pressure-holding support frame (6581), a pushing assembly (68) is provided in the pressure-holding support frame (6581) and located directly below the pressure-holding through-hole (65811), and the workpiece (69) to be pressure-held is pushed towards the top of the pressure-holding support frame (6581) by the pushing assembly (68) such that the pressure-holding region of the workpiece (69) is exposed in the pressure-holding through-hole (65811); There are two sets of the circumferential pressure-holding blocks, and they are symmetrically arranged with respect to the central pressure-holding rod (653).

2. The self-weight pressure maintaining mechanism according to claim 1, wherein The weights of any two circumferential counterweight blocks are different from each other.

3. The self-weight pressure maintaining mechanism according to claim 1, wherein A pressure-holding guiding assembly (659) is fixedly connected to the pressure-holding support frame (6581) and is arranged above the pressure-holding through-hole (65811); The pressure-holding guiding assembly (659) includes two guiding vertical plates, the two guiding vertical plates are parallel and spaced apart to form a guiding space therebetween, the central counterweight block and the circumferential counterweight blocks are arranged in the guiding space and are all slidably connected to the inner sides of the guiding vertical plates in the vertical direction.

4. The self-weight pressure maintaining mechanism according to claim 3, characterized in that, The central counterweight block includes: A central counterweight support frame, which is supported by the central pressure-holding rod (653) and is slidably mated with the inner side of the guiding vertical plate; and At least one central counterweight weight, which is arranged on the central counterweight support frame.

5. The self-weight pressure maintaining mechanism according to claim 3, wherein The circumferential counterweight block includes: A circumferential counterweight support frame, which is supported by the circumferential pressure-holding block and is slidably mated with the inner side of the guiding vertical plate; and At least one circumferential counterweight weight, which is arranged on the circumferential counterweight support frame.

6. The self-weight pressure maintaining mechanism according to claim 3, wherein A central reset component is elastically connected between the central counterweight block and the top of the pressure-holding support frame (6581), and a circumferential reset component is elastically connected between the circumferential counterweight block and the top of the pressure-holding support frame (6581).

7. The self-weight pressure maintaining mechanism according to claim 6, wherein A limiting block (657) is arranged in the guiding space, and the limiting block (657) is composed of a lower cross beam (6571), an upper cross beam (6572) and support columns connecting the lower cross beam (6571) and the upper cross beam (6572) to form an I shape; The upper cross beam (6572) is used to receive the central reset component so that the upper cross beam (6572) supports the central counterweight block; The lower crossbeam (6571) is used to receive the circumferential reset component so that the lower crossbeam (6571) supports the circumferential counterweight.

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