CN219405426U - Pressure maintaining equipment - Google Patents

Abstract

The utility model discloses pressure maintaining equipment which comprises a driving assembly, an upper die assembly and a lower die assembly, wherein the driving assembly is connected with the upper die assembly and is used for driving the upper die assembly to move along a set direction; the lower die assembly comprises a die holder and a positioning part, the die holder is provided with a die cavity, the die cavity is used for placing a product to be pressed, the product to be pressed is provided with a peripheral wall surrounding the set direction, the positioning part is arranged on the die holder and comprises a positioning part, the positioning part is provided with an abutting end, the position of the abutting end in the die cavity is adjustable, and the abutting end is used for abutting against the peripheral wall. In specific use, the reliable abutting of products to be pressed with different sizes can be realized by adjusting the position of the abutting end in the die cavity, so that the pressure maintaining equipment can be compatible with products to be pressed with more sizes, the universality can be greatly improved, and the purposes of saving equipment cost and management cost can be realized.

Description

Pressure maintaining equipment

Technical Field

The utility model relates to the technical field of pressure maintaining equipment, in particular to pressure maintaining equipment.

Background

When the screen is installed or replaced, the electronic products in the forms of mobile phones, tablet computers and the like need to be subjected to pressure maintaining so as to ensure reliable lamination between the screen and the machine body, and further, the faults such as glue opening, tilting and the like of the screen can be avoided to a greater extent. However, in the conventional technical solution, an electronic product of a model corresponds to a pressure maintaining device, which causes various pressure maintaining devices and is not beneficial to the management and use of the devices.

Therefore, how to provide a solution to overcome or alleviate the above-mentioned drawbacks is still a technical problem to be solved by those skilled in the art.

Disclosure of Invention

The utility model aims to provide pressure maintaining equipment which can be suitable for the mould pressing of products to be pressed of various types, and can reduce the types of the pressure maintaining equipment so as to facilitate management and use.

In order to solve the technical problems, the utility model provides pressure maintaining equipment, which comprises a driving assembly, an upper die assembly and a lower die assembly, wherein the driving assembly is connected with the upper die assembly and is used for driving the upper die assembly to move along a set direction; the lower die assembly comprises a die holder and a positioning part, the die holder is provided with a die cavity, the die cavity is used for placing a product to be pressed, the product to be pressed is provided with a peripheral wall surrounding the set direction, the positioning part is arranged on the die holder and comprises a positioning part, the positioning part is provided with an abutting end, the position of the abutting end in the die cavity is adjustable, and the abutting end is used for abutting against the peripheral wall.

By adopting the scheme, the reliable abutting of products to be pressed with different sizes can be realized by adjusting the position of the abutting end in the die cavity, so that the pressure maintaining equipment provided by the utility model can be compatible with products to be pressed with more types, the universality of the pressure maintaining equipment provided by the utility model can be greatly improved, and the purposes of saving the equipment cost and the management cost can be realized.

And moreover, the use cost of the off-line maintenance storefront can be reduced, so that the maintenance capability of the off-line maintenance storefront is improved, the after-sale service difficulty of the product to be pressed is reduced, and the satisfaction of customers can be improved.

Optionally, the positioning part further comprises an adjusting screw, the positioning part is provided with a positioning hole, and the adjusting screw is inserted into the positioning hole and is connected with the die holder.

Optionally, the die holder is provided with a chute, and the positioning part is configured in the chute.

Optionally, the positioning part comprises a screw rod section, and the screw rod section is assembled with the die holder in a threaded manner.

Optionally, the positioning part is a second elastic piece; or, the positioning part further comprises a second elastic piece, and the positioning part is installed through the second elastic piece.

Optionally, the die holder includes a base plate and a base peripheral plate arranged around the set direction, and at least one of the base plate and the base peripheral plate is provided with a notch.

Optionally, the die holder comprises a base bottom plate and a base peripheral plate which is arranged around the set direction, and one surface of the base bottom plate, which faces the upper die assembly, is provided with a plurality of dimension lines.

Optionally, the upper die assembly includes a base plate member and a pressing member detachably mounted to the base plate member.

Optionally, one of the substrate component and the pressing component is formed with a slot, and the other is formed with a plug-in portion, and the plug-in portion can be plug-in fitted into the slot.

Optionally, the substrate component and the pressing component are magnetically connected.

Optionally, the pressing component includes a die pressing plate and a pressing head, the pressing head is located at one side of the die pressing plate facing the lower die assembly, and the inserting portion is configured on the die pressing plate.

Optionally, the device further comprises a frame assembly, and the driving assembly and the lower die assembly are both mounted on the frame assembly.

Optionally, the device further comprises a guiding assembly, wherein the guiding assembly is mounted on the frame assembly and used for guiding the driving of the driving assembly.

Drawings

FIG. 1 is a schematic diagram of a pressure maintaining apparatus according to an embodiment of the present utility model;

FIG. 2 is a schematic view of the structure of FIG. 1 from another perspective;

FIG. 3 is a schematic view of the structure of the upper die assembly;

FIG. 4 is a schematic view of the lower die assembly;

fig. 5 is a schematic structural view of the substrate member.

The reference numerals are explained as follows:

1a driving assembly, 11 handles, 12 driving frames, 13 driving columns, 14 driving plates and 15 first elastic pieces;

2 upper die assembly, 21 base plate part, 211 upper die top plate, 212 upper die side plate, 213 upper die limit plate, 214 slot, 22 press fitting part, 221 die press plate, 221a plug-in part and 222 press head part;

3 lower die components, 31 die holders, 31a die cavities, 31b sliding grooves, 31c notches, 311 base plates, 311a size lines, 312 base peripheral plates, 32 positioning parts, 321 abutting ends and 322 positioning holes;

4 frame assembly, 41 bottom plate, 42 side plate, 43 top plate, 44 bottom post;

5 guide assemblies, 51 guide posts, 52 guide barrels.

Detailed Description

In order to make the technical solution of the present utility model better understood by those skilled in the art, the present utility model will be further described in detail with reference to the accompanying drawings and specific embodiments.

In embodiments of the present utility model, the terms "first," "second," and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include one or more such feature.

References to directional terms in the embodiments of the present utility model, such as "top", "low", "upper", "lower", "inner", "outer", etc., are only with reference to the directions of the drawings, and thus are used for better, more clear explanation and understanding of the embodiments of the present utility model, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as limiting the embodiments of the present utility model.

In the present embodiment, the term "plurality" refers to a plurality of indefinite numbers, typically two or more. Furthermore, when "a number" is used to denote the number of a certain number of components, the number of components is not necessarily related to each other.

In describing embodiments of the present utility model, it should be noted that, unless explicitly stated and limited otherwise, the terms "mounted," "connected," and "connected" should be construed broadly, and for example, "connected" may be either detachably connected or non-detachably connected; may be directly connected or indirectly connected through an intermediate medium.

In the description of embodiments of the present utility model, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one … …" does not exclude the presence of other like elements in a process, method, article, or apparatus that comprises the element.

Referring to fig. 1 and 2, fig. 1 is a schematic structural diagram of an embodiment of a pressure maintaining apparatus according to the present utility model, and fig. 2 is a schematic structural diagram of fig. 1 at another view angle.

The pressure maintaining equipment is used for pressing the screen and the machine body when the electronic product leaves a factory or is maintained, so that the screen and the machine body are reliably attached, and further faults such as glue opening, tilting and the like of the screen can be avoided to a large extent. The electronic product mentioned here may be a tablet computer, a mobile phone, a learning machine, a translation machine, etc. with a screen, and the screen is a product connected with the body by an adhesive manner.

Referring to fig. 1 and 2, the above-described pressure maintaining apparatus includes a driving assembly 1, an upper die assembly 2, a lower die assembly 3, a frame assembly 4, and a guide assembly 5.

The frame assembly 4 is used to form an outer frame of the pressure maintaining device and can provide a structural basis for the installation of other components/assemblies, and the structural form can be various as long as the requirements of use can be met.

In the embodiment of fig. 1 and 2, the frame assembly 4 includes a bottom plate 41, two side plates 42 and a top plate 43, the two side plates 42 may be disposed opposite each other, and the bottom of the two side plates 42 may be connected to the bottom plate 41 and the top may be connected to the top plate 43, with specific connection manners including, but not limited to, welding, screw connection, bonding, clamping, riveting, and the like. The bottom surface of the base plate 41 is provided with a plurality of bottom posts 44 for supporting the base plate 41 and for facilitating the stable placement of the frame assembly 4 on the ground or other operating surface. The number of the bottom posts 44 may be generally three or four, and when four, the bottom posts 44 may be distributed at four corners of the bottom plate 41; of course, other numbers of bottom posts 44 are possible and are not limited herein.

The drive assembly 1 is used to provide a driving force. As also shown in fig. 1 and 2, the drive assembly 1 may include a handle 11, a drive frame 12, a drive post 13, a drive plate 14, and a number of first resilient members 15; the driving frame 12 can be mounted on the top plate 43, and the driving column 13 can be inserted into the top plate 43 and can axially displace relative to the top plate 43; the handle 11 can be hinged and assembled on the driving frame 12, the handle 11 can be connected with the transmission column 13, and when the handle 11 rotates relative to the driving frame 12, the handle 11 can drive the transmission column 13 to axially displace relative to the top plate 43; the lower end of the transmission column 13 may be connected with a transmission plate 14; the driving plate 14 can be connected with the upper die assembly 2 through the first elastic member 15, and the first elastic member 15 is arranged, so that the upper die assembly 2 and the lower die assembly 3 can absorb larger dimensional tolerance during die assembly, flatness of the upper die assembly 2 can be adjusted, uniform stress at each position of the upper die assembly 2 can be guaranteed, reliable compression of a screen can be guaranteed, and in some embodiments, screws (or threaded rods and the like) can be further arranged between the driving plate 14 and the upper die assembly 2, so that the distance between the driving plate 14 and the upper die assembly 2 can be controlled.

In the above embodiment, the pressure maintaining device is manually operated through the handle 11, and has a simple structure, no need of relatively complex operation environment such as electricity, low cost and relatively low using threshold.

It will be appreciated that in some other implementations of the embodiments of the utility model, the drive assembly 1 may also be configured with an automatic drive with a higher degree of automation, instead of manual operation of the handle 11; the automatic driving piece has the advantages of low labor intensity, simple operation, stable operation force and the like, and is more beneficial to ensuring the reliable compaction of the screen. In practical application, the automatic driving member may be a driving element capable of directly outputting linear displacement, such as a linear cylinder, a linear oil cylinder, etc.; alternatively, the automatic driving member may be a driving element that directly outputs rotational displacement, such as a motor or a revolving cylinder, and in this case, a displacement conversion mechanism in the form of a rack-and-pinion mechanism or a screw mechanism is also required to convert the rotational displacement directly output by the driving element into a desired linear displacement.

The first elastic member 15 may be a linear spring, and the linear spring is a finished product element, and has numerous types, convenient selection and acquisition, and good deformation and recovery capability, and can be well applied to the pressure maintaining device provided by the utility model. In addition, the first elastic member 15 may be made of a flexible material such as rubber.

The guide assembly 5 may include a guide post 51 and a guide cylinder 52, wherein the guide cylinder 52 may be mounted on the top plate 43, the guide post 51 may be inserted into the guide cylinder 52 and may be connected to the driving plate 14, and the displacement of the driving plate 14 may be guided by the cooperation of the guide post 51 and the guide cylinder 52, so as to ensure the displacement direction of the driving plate 14, thereby better assisting the operation of the driving assembly 1. In fact, in addition to the guiding and matching scheme of the guiding post 51 and the guiding cylinder 52, the guiding assembly 5 may also adopt a matching scheme of the guiding post 51 and the guiding hole, a matching scheme of the sliding block and the sliding groove, etc., that is, the structural form of the guiding assembly 5 is not unique, and in practical application, a person skilled in the art may choose according to specific needs, so long as guiding energy supply can be achieved.

The lower die assembly 3 may be mounted to the base plate 41 by means including, but not limited to, welding, bolting, bonding, clamping, riveting, etc. The lower die assembly 3 is used for placing a product to be pressed (not shown in the figure), and can fix the product to be pressed so as to avoid the position of the product to be pressed from moving in the pressing process.

The upper die assembly 2 can be driven by the driving assembly 1 to move along a set direction, wherein the set direction refers to the axial direction of the transmission column 13, that is, the direction in which the upper die assembly 2 approaches or separates from the lower die assembly 3. Specifically, when the upper die assembly 2 is relatively close to the lower die assembly 3, the pressing of the product to be pressed can be achieved, and when the upper die assembly 2 is relatively far from the lower die assembly 3, the releasing of the product to be pressed can be achieved.

As described in the background art section, in the conventional scheme, the types of the pressure maintaining devices and the products to be pressed are basically in one-to-one correspondence, which results in a plurality of types of the pressure maintaining devices, and is not beneficial to the management and use of the devices. Moreover, for a common offline repair shop, it is also difficult to purchase all kinds of pressure maintaining equipment, which greatly limits the repair capability of the offline repair shop and also greatly increases the after-sales service difficulty of the product to be pressed.

Therefore, the embodiment of the utility model adjusts the structural forms of the lower die assembly 3 and the upper die assembly 2, so that the lower die assembly 3 and the upper die assembly 2 can adapt to the lamination of more products to be laminated, one pressure maintaining device can be compatible with more machine types, the purposes of saving the device cost and the management cost can be realized, the use cost of an off-line maintenance storefront can be reduced, the maintenance capability of the off-line maintenance storefront can be improved, the after-sale service difficulty of the products to be laminated is reduced, and the satisfaction of customers can be improved.

Referring to fig. 3, fig. 3 is a schematic structural diagram of the upper die assembly.

As shown in fig. 3, in the embodiment of the present utility model, the lower die assembly 3 includes a die holder 31 and a positioning member, and the die holder 31 may be connected to the base plate 41 as described above.

The die holder 31 includes a seat bottom plate 311 and a seat peripheral plate 312, and the seat peripheral plate 312 may be arranged around a set direction. The seat peripheral plate 312 and the seat bottom plate 311 may be integrally formed; alternatively, the seat peripheral plate 312 and the seat bottom plate 311 may be prepared separately and then assembled by screw connection, welding, clamping, riveting, bonding, or the like. The base plate 311 and the base peripheral plate 312 may enclose a mold cavity 31a, and the mold cavity 31a is used for placing a product to be pressed. In other embodiments, the die holder 31 may include only the seat plate 312, where the die cavity 31a may be formed by surrounding the seat plate 312, and the product to be pressed in the die cavity 31a may be directly contacted with the bottom plate 41.

In some alternative embodiments, at least one of the seat bottom plate 311 and the seat peripheral plate 312 may be provided with the notch 31c. In the solution of the foregoing fig. 1 and fig. 2, both the seat bottom plate 311 and the seat peripheral plate 312 may be provided with a notch 31c, and the notch 31c may be used as a hand taking position during specific operation, so that the product to be pressed may be conveniently taken and placed.

In some alternative embodiments, the surface of the seat bottom plate 311 facing the upper die assembly 2 may be further provided with a plurality of dimension lines 311a, and different dimension lines 311a may correspond to the dimensions of different products to be pressed. In a specific operation, the dimension line 311a can guide the placement of the product to be pressed in the mold cavity 31a and the adjustment of the positioning component, so that the convenience of operation can be improved.

The product to be laminated is usually a flat plate-like product including a top wall and a bottom wall disposed opposite to each other in a set direction, and a peripheral wall surrounding the set direction. It should be understood that the set direction corresponds to the thickness direction of the product to be pressed when the product to be pressed is mounted on the lower die assembly 3.

The positioning component is mounted on the die holder 31, the positioning component comprises a positioning part 32, the positioning part 32 is provided with an abutting end 321, the position of the abutting end 321 in the die cavity 31a is adjustable, and the abutting end 321 is used for abutting against the peripheral wall. By adopting the scheme, the position of the abutting end 321 in the die cavity 31a can be adjusted to reliably abut against products to be pressed with different sizes, so that the pressure maintaining equipment provided by the utility model can be compatible with products to be pressed with more types of products, and the universality of the pressure maintaining equipment provided by the utility model can be greatly improved.

The embodiment of the present utility model is not limited to a specific structural form of the positioning component, and in actual use, a person skilled in the art may determine the positioning component according to specific needs, so long as the positioning component can meet the use requirements. The following examples of the utility model will each illustrate several structures that may exist in an adjustment member in connection with several specific embodiments.

In the first embodiment, the positioning portion 32 may be a positioning block, on which a positioning hole 322 may be configured, and the positioning component may further include an adjusting screw (not shown in the drawing), where the adjusting screw is inserted into the positioning hole 322 and connected to the die holder 31.

When the adjusting screw is not screwed down, the positioning part 32 can move in position relative to the adjusting screw, so that the position of the abutting end 321 of the positioning part 32 in the die cavity 31a can be adjusted, and the peripheral walls of products to be pressed with different sizes can be abutted. When the adjusting screw is screwed down, the positioning part 32 can be locked, so that the position of the positioning part 32 can be prevented from moving, and the reliable positioning of the product to be pressed can be ensured.

Here, the embodiment of the present utility model is not limited to the specific shape of the positioning hole 322, and in practical applications, a person skilled in the art may set the positioning hole according to actual needs, so long as the technical purpose that the positioning portion 32 can perform a position movement with respect to the adjusting screw when the adjusting screw is not tightened can be satisfied. For example, the positioning hole 322 may be a bar-shaped hole, or the positioning hole 322 may be a circular hole having an inner diameter larger than the shaft portion of the adjusting screw, or the like.

As also shown in fig. 3, the die holder 31 may be further provided with a chute 31b, and the positioning portion 32 may be disposed in the chute 31 b. The chute 31b may serve as a guide structure for guiding the moving direction of the positioning portion 32. The chute 31b may be provided only on the seat peripheral plate 312, or may be provided on both the seat peripheral plate 312 and the seat bottom plate 311.

In the second embodiment, the positioning portion 32 may also include a screw segment (not shown in the drawings), that is, at least a part of the area of the positioning portion 32 may be provided with external threads, and the screw segment may be screwed to the die holder 31, specifically, may be fitted to the peripheral plate 312. In this embodiment, by screwing the screw rod segment, the position of the abutting end 321 in the die cavity 31a can be adjusted, so that the abutting of products to be pressed with different sizes can be realized.

Further, a lock nut may be further configured, which may be mounted to the screw section and may be abutted against the seat peripheral plate 312 for eliminating a thread clearance and achieving locking of the screw section. The lock nut may be located inside the mold cavity 31a or outside the mold cavity 31 a.

In the third embodiment, the positioning portion 32 may be a second elastic member (not shown), and the type of the second elastic member may refer to the first elastic member 15, which is not described repeatedly herein. In this embodiment, one end of the second elastic member may be connected to the seat peripheral plate 312, and the other end of the second elastic member may be the aforementioned abutting end 321, and when the device is specifically used, the size of the positioning portion 32 may be changed by adjusting the compression amount of the second elastic member, and also the abutting of products to be pressed with different sizes may be achieved.

As a modification of the above embodiment, the positioning member may further include a second elastic member, and the positioning portion 32 may be mounted by the second elastic member, and at this time, by adjusting the compression amount of the second elastic member, the position of the entire positioning portion 32 in the mold cavity 31a may be changed, so as to adapt to the abutment of products to be pressed in different sizes.

Referring to fig. 4 and 5, fig. 4 is a schematic structural view of the lower die assembly, and fig. 5 is a schematic structural view of the substrate member.

As shown in fig. 4, the upper module 2 may include a base member 21 and a pressing member 22, where the base member 21 may be connected to the driving plate 14 by the first elastic member 15, and the pressing member 22 may be detachably mounted on the base member 21, and specific detachable connection manners include, but are not limited to, plugging, screw connection, and clamping connection. By the arrangement, when pressing operation is carried out on products to be pressed with different sizes, the pressing component 22 can be replaced according to the needs, so that the pressing requirements of the products to be pressed can be better met, and the universality of the pressure maintaining equipment according to the embodiment of the utility model can be improved to a greater extent.

It should be appreciated that the bonding element 22 has a bonding area and the screen of the product to be bonded has a screen display area, and that if the bonding area is greater than the screen display area, it is contemplated that the bonding element 22 may not be replaced (as determined in connection with a particular use); that is, the pressing member 22 does not necessarily need to be replaced every time the products to be pressed of different sizes are pressed.

Taking a plugging scheme as an example, one of the substrate member 21 and the pressing member 22 may be formed with a slot 214, and the other may be formed with a plugging portion 221a, the plugging portion 221a being capable of being plugged-fitted into the slot 214. In the embodiment of fig. 4 and 5, the slot 214 is formed in the substrate member 21, and the insertion portion 221a is formed in the pressing member 22. The embodiment of the present utility model is not limited to the formation manner of the slot 214 and the plug portion 221a, and in practical application, those skilled in the art may perform configuration according to specific needs, so long as the requirements of use can be satisfied.

In the solution of fig. 4, the pressing member 22 may include a pressing plate 221 and a pressing head 222; the pressing head 222 may be located on the side of the molding plate 221 facing the lower mold assembly 3, and the specific connection manner may be bonding or the like; the insertion portion 221a may be formed on the molding plate 221 and disposed on both left and right sides of the molding plate 221, or the insertion portion 221a may be located on a side of the molding plate 221 facing away from the platen portion 222.

The pressing portion 222 may be made of flexible materials such as soft rubber, so as to reduce the pressing loss of the product to be pressed. The press head portion 222 may have a flat plate structure or a ring structure, and may be specifically determined according to actual use requirements.

In the solution of fig. 5, the base plate member 21 may include an upper mold top plate 211 and two upper mold side plates 212, where the upper mold side plates 212 may be L-shaped and may enclose with the upper mold top plate 211 to form a front slot 214, and the upper mold limiting plate 213 may be located at one end of the slot 214, so as to define a plugging position of the pressing member 22.

In some alternative embodiments, the upper die limiting plate 213 may further be configured with a magnetic attraction member for performing attraction fixation on the pressing member 22, so as to improve connection reliability between the pressing member 22 and the substrate member 21. The magnetic attraction member may be a magnet, the pressing member 22 may be provided with a magnet having opposite polarity, or the molding plate 221 may be made of a material that can be magnetically attracted, such as iron.

In fact, since the insertion direction of the pressing member 22 is perpendicular to the operation direction of the upper die assembly 2, the pressing member 22 and the base member 21 are not substantially separated from each other even if the above-described magnetic attachment structure is not provided.

The foregoing is merely a preferred embodiment of the present utility model and it should be noted that modifications and adaptations to those skilled in the art may be made without departing from the principles of the present utility model, which are intended to be comprehended within the scope of the present utility model.

Claims (13)

1. The pressure maintaining equipment is characterized by comprising a driving assembly (1), an upper die assembly (2) and a lower die assembly (3), wherein the driving assembly (1) is connected with the upper die assembly (2) and is used for driving the upper die assembly (2) to move along a set direction;

the lower die assembly (3) comprises a die holder (31) and a positioning part, the die holder (31) is provided with a die cavity (31 a), the die cavity (31 a) is used for placing a product to be pressed, the product to be pressed is provided with a peripheral wall surrounding the set direction, the positioning part is arranged on the die holder (31), the positioning part comprises a positioning part (32), the positioning part (32) is provided with an abutting end (321), the position of the abutting end (321) in the die cavity (31 a) is adjustable, and the abutting end (321) is used for abutting against the peripheral wall.

2. Pressure maintaining device according to claim 1, characterized in that the positioning part further comprises an adjusting screw, the positioning part (32) is provided with a positioning hole (322), and the adjusting screw is inserted into the positioning hole (322) and is connected with the die holder (31).

3. Pressure maintaining device according to claim 2, characterized in that the die holder (31) is provided with a chute (31 b), the positioning portion (32) being arranged in the chute (31 b).

4. Pressure maintaining device according to claim 1, characterized in that the positioning part (32) comprises a screw section which is screw-fitted to the die holder (31).

5. Pressure maintaining device according to claim 1, characterized in that the positioning portion (32) is a second elastic member; or alternatively, the process may be performed,

the positioning part further comprises a second elastic piece, and the positioning part (32) is installed through the second elastic piece.

6. Pressure maintaining device according to claim 1, characterized in that the die holder (31) comprises a base plate (311) and a base peripheral plate (312) arranged around the set direction, at least one of the base plate (311) and the base peripheral plate (312) being provided with a notch (31 c).

7. Pressure maintaining device according to claim 1, characterized in that the die holder (31) comprises a base plate (311) and a base peripheral plate (312) arranged around the set direction, the face of the base plate (311) facing the upper die assembly (2) being provided with several dimension lines (311 a).

8. Pressure maintaining device according to any one of claims 1-7, characterized in that the upper die assembly (2) comprises a base plate part (21) and a press-fit part (22), the press-fit part (22) being detachably mounted to the base plate part (21).

9. Pressure maintaining device according to claim 8, characterized in that one of the base plate part (21) and the press-fit part (22) is formed with a slot (214), the other is formed with a plug-in part (221 a), the plug-in part (221 a) being plug-in fittable to the slot (214).

10. Pressure maintaining device according to claim 9, characterized in that the base plate part (21) and the press-fit part (22) are magnetically connected.

11. Pressure maintaining device according to claim 9, characterized in that the press-fit part (22) comprises a press plate (221) and a press head part (222), the press head part (222) being located at a side of the press plate (221) facing the lower die assembly (3), the plug part (221 a) being arranged at the press plate (221).

12. Pressure maintaining device according to any one of claims 1-7, further comprising a frame assembly (4), wherein the drive assembly (1) and the lower die assembly (3) are both mounted to the frame assembly (4).

13. Pressure maintaining device according to claim 12, further comprising a guiding assembly (5), said guiding assembly (5) being mounted to said frame assembly (4) for guiding the driving of said driving assembly (1).