Dry pressing forming machine for PTC ceramic heater powder preparation

Abstract

The invention belongs to the technical field of ceramic preparation, and discloses a dry pressing forming machine for PTC ceramic heater powder preparation, which comprises a shell, and further comprises a lower mold, an upper mold and a lower mold, the lower mold is arranged on the outer wall of the shell, and a demolding mechanism is arranged on the inner wall of the lower mold; the driving module is arranged on the outer wall of the top end of the shell, and an upper mold is arranged at the movable end of the driving module through a connecting mechanism; the collecting mechanism is arranged in the inner wall of the shell; wherein the demolding mechanism comprises a moving rod, and the inner wall of the moving rod is elastically connected with a triangular block through an elastic piece A; through cooperation of the cambered surface block, the moving rod and other structures, the upper mold moves upwards to drive the ejection block to eject a ceramic green body upwards out of the mold cavity, the two sets of lower molds move towards the two sides at the same time to be disengaged from the green body, it is ensured that the green body is not bonded with the mold cavity, and then an operator can take out the green body conveniently.

Description

Technical Field

[0001] The present invention belongs to the technical field of ceramic preparation, and specifically relates to a dry pressing forming machine for preparing PTC ceramic heater powder. Background Art

[0002] A dry pressing forming machine for preparing PTC ceramic heater powder is a device used to form a specific-shaped blank from PTC ceramic powder through a dry pressing process. Its working principle is to compress the powder under a certain pressure using a mold, making the powder particles closely combine. At the same time, by controlling parameters such as pressure, pressure application speed, and pressure holding time, it ensures that the blank has appropriate density, strength, and dimensional accuracy, providing a basis for subsequent processes such as sintering.

[0003] The powder needs to be placed in the lower mold, and the powder is compressed by the upper mold to complete the preparation. In some existing technologies, under the action of huge pressure, the powder may adhere to the mold cavity of the lower mold, making it inconvenient for the operator to take out. Moreover, in some lower molds, after the blank is pressed, it fits tightly with the lower mold, and the gap between the two is small, making it inconvenient to demold and take. Therefore, a dry pressing forming machine for preparing PTC ceramic heater powder is proposed to solve the above problems. Summary of the Invention

[0004] To solve the problems raised in the above background art, the present invention provides a dry pressing forming machine for preparing PTC ceramic heater powder.

[0005] To achieve the above object, the present invention provides the following technical solution: A dry pressing forming machine for preparing PTC ceramic heater powder, including a housing, further including: A lower mold, the lower mold is arranged on the outer wall of the housing, and a demolding mechanism is arranged on the inner wall of the lower mold; A driving module, the driving module is arranged on the top outer wall of the housing, and the moving end of the driving module is provided with an upper mold through a connecting mechanism; A collecting mechanism, the collecting mechanism is arranged in the inner wall of the housing; Wherein, the demolding mechanism includes a moving rod, and a triangular block is elastically connected to the inner wall of the moving rod through an elastic member A; The connecting mechanism includes a connecting plate, and a square block is elastically connected to the inner wall of the connecting plate through an elastic member B; The collecting mechanism includes a cross bar, and a wedge block is fixedly connected to the outer wall of the cross bar.

[0006] Preferably, a fixing rod is fixedly connected to the outer wall of the driving module. An arc-shaped block is fixedly connected to the outer wall of the bottom end of the fixing rod. A runner is rotatably connected to the inner wall of the moving rod. A pulling rope is wound around the outer wall of the runner. A trapezoidal block is fixedly connected to the outer wall of the top end of the moving rod. The trapezoidal block is elastically connected to the outer wall of the housing through a return spring. A connecting rod is slidably connected to the outer wall of the trapezoidal block. A top block is fixedly connected to the outer wall of the top end of the trapezoidal block.

[0007] Preferably, the lower mold is slidably connected to the outer wall of the housing. The connecting rod is fixedly connected to the inner wall of the lower mold. The top block contacts the inner wall of the lower mold. The moving rod contacts the inner wall of the lower mold.

[0008] Preferably, one end of the elastic member A is fixedly connected to the outer wall of the triangular block. The other end of the elastic member A is fixedly connected to the inner wall of the moving rod. The triangular block is slidably connected in the inner wall of the moving rod. The triangular block contacts the outer wall of the arc-shaped block.

[0009] Preferably, one end of the pulling rope is fixedly connected to the outer wall of the housing. The other end of the pulling rope is fixedly connected to the outer wall of the triangular block.

[0010] Preferably, an inclined plane block is slidably connected to the inner wall of the connecting plate. A sliding rod is fixedly connected to the outer wall of the inclined plane block. A short rod is slidably connected to the inner wall of the connecting plate. A groove is formed in the outer wall of the upper mold.

[0011] Preferably, one end of the short rod is fixedly connected to the outer wall of the square block. The other end of the short rod is slidably connected to the outer wall of the inclined plane block. The connecting plate is fixedly connected to the output shaft of the driving module.

[0012] Preferably, one end of the elastic member B is fixedly connected to the outer wall of the square block. The other end of the elastic member B is fixedly connected to the inner wall of the connecting plate. The square block is slidably connected in the inner wall of the connecting plate. The square block is clamped with the groove.

[0013] Preferably, a through groove is formed in the outer wall of the housing. The cross bar is elastically connected to the inner wall of the housing through a telescopic spring. A collection box is arranged in the inner wall of the housing. A slot is formed in the inner wall of the collection box. A convex block is fixedly connected to the outer wall of the cross bar.

[0014] Preferably, one end of the telescopic spring is fixedly connected to the outer wall of the cross bar. The other end of the telescopic spring is fixedly connected to the inner wall of the housing. The convex block penetrates through the outer wall of the housing. The wedge-shaped block is clamped with the slot. The cross bar is slidably connected in the inner wall of the housing.

[0015] Compared with the prior art, the beneficial effects of the present invention are as follows: The present invention provides a combination of structures such as a cambered block and a moving rod. When the upper and lower molds are completed and need to be demolded, the upper mold moves upward to drive the ejector block to eject the ceramic body from the mold cavity. The two sets of lower molds move to both sides at the same time to break away from the body, ensuring that the body does not adhere to the mold cavity, thereby facilitating the operator to remove the body. The present invention provides a combination of structures such as an inclined block and a square block, and by pressing the slide bar to move the square block into the inner wall of the connecting plate, the upper mold can be disassembled or installed in the connecting plate. The operation is convenient and quick, and there is no need to rotate bolts for disassembly and installation, which saves time and effort. The present invention cooperates with structures such as wedge blocks and protrusions, so that the operator can scrape the powder scattered on the shell workbench to the through groove through an external tool, and drop it into the collection box. The collection box can be taken out by moving the protrusion, and the powder inside can be recycled. The operator does not need to scrape and hold the container to collect at the same time, which is more convenient for cleaning. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a schematic diagram of the main structure of the present invention; Figure 2 This is a schematic diagram of the lower mold and demoulding mechanism structure of the present invention; Figure 3 Schematic diagram of the demoulding mechanism structure of the present invention; Figure 4 Schematic diagram of the cross-sectional structure of the lower mold and the moving rod of the present invention; Figure 5 This is a cross-section of the connecting plate and a schematic diagram of the exploded structure of the upper mold of the present invention; Figure 6 It is a schematic diagram of the structure after the collection box section and the shell section are exploded according to the present invention.

[0017] In the figure: 1. Shell; 2. Lower mold; 3. Demolding mechanism; 301. Fixed rod; 302. Arc block; 303. Moving rod; 304. Rotating wheel; 305. Pull rope; 306. Elastic part A; 307. Triangular block; 308. Trapezoidal block; 309. Return spring; 310. Connecting rod; 311. Top block; 4. Connecting mechanism; 401. Connecting plate; 402. Sliding rod; 403. Inclined block; 404. Elastic part B; 405. Square block; 406. Short rod; 5. Collecting mechanism; 501. Telescopic spring; 502. Cross bar; 503. Protrusion; 504. Wedge block; 505. Collecting box; 506. Slot; 6. Upper mold; 7. Driving module; 8. Through slot; 9. Groove. DETAILED DESCRIPTION

[0018] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0019] As Figures 1 to 6 shown, the present invention provides a dry pressing machine for preparing PTC ceramic heater powder, including a housing 1, and further including: A lower mold 2 is disposed on the outer wall of the housing 1, and a demolding mechanism 3 is provided on the inner wall of the lower mold 2; A driving module 7 is disposed on the outer wall of the top end of the housing 1, and an upper mold 6 is provided at the movable end of the driving module 7 through a connecting mechanism 4; A collecting mechanism 5 is disposed in the inner wall of the housing 1; Among them, the demolding mechanism 3 includes a moving rod 303, and a triangular block 307 is elastically connected to the inner wall of the moving rod 303 through an elastic member A 306; The connecting mechanism 4 includes a connecting plate 401, and a square block 405 is elastically connected to the inner wall of the connecting plate 401 through an elastic member B 404; The collecting mechanism 5 includes a cross bar 502, and a wedge block 504 is fixedly connected to the outer wall of the cross bar 502.

[0020] Adopting the above solution: The housing 1 is the main body of the dry pressing machine for preparing PTC ceramic heater powder. The powder raw material can be placed in the lower mold 2. By driving the upper mold 6 to move downward by the driving module 7 and extruding the powder in the lower mold 2, the dry pressing preparation can be completed, which is the prior art. After the preparation is completed, during the process of the upper mold 6 moving upward for demolding, the top block 311 in the demolding mechanism 3 can be driven to push the prepared material upward, facilitating the operator to take it. The connecting mechanism 4 can fix the upper mold 6, and when it is necessary to replace the upper mold 6, it is convenient to disassemble and install it without the need to operate by turning bolts, which is convenient and fast. During the process of placing the powder raw material in the lower mold 2, the powder may fall on the workbench of the housing 1, and it is necessary for the operator to manually clean and collect it to avoid waste. The collecting mechanism 5 can facilitate the operator to centrally process the powder.

[0021] As Figures 2 to 4As shown, a fixed rod 301 is fixedly connected to the outer wall of the driving module 7. The bottom outer wall of the fixed rod 301 is fixedly connected to an arc-shaped block 302. A runner 304 is rotatably connected to the inner wall of the moving rod 303. A pulling rope 305 is wound around the outer wall of the runner 304. The top outer wall of the moving rod 303 is fixedly connected to a trapezoidal block 308. The trapezoidal block 308 is elastically connected to the outer wall of the housing 1 through a return spring 309. A connecting rod 310 is slidably connected to the outer wall of the trapezoidal block 308. The top outer wall of the trapezoidal block 308 is fixedly connected to a top block 311.

[0022] Adopting the above solution: The lower mold 2 is split-type and is provided with two symmetrical groups. The two groups are combined together to form the main body of the lower mold 2. The top outer wall of the top block 311 is flush with the inner wall of the bottom end of the mold cavity in the lower mold 2. The fixed rod 301 is arranged on both sides of the bottom end of the driving module 7. When the driving module 7 drives the upper mold 6 to move up and down, the fixed rod 301 and the arc-shaped block 302 will move synchronously. The inclined surface of the triangular block 307 always faces upward. Under normal conditions, the elastic member A306 keeps the triangular block 307 in a state of popping outwards due to its own elastic force. The moving rod 303 can move up and down in the inner wall of the lower mold 2. Two connecting rods 310 are arranged and symmetrically distributed on both sides of the trapezoidal block 308. The two connecting rods 310 are respectively fixedly connected to the inner walls of the two sides of the lower mold 2.

[0023] As Figures 2 to 4 shown, the lower mold 2 is slidably connected to the outer wall of the housing 1. The connecting rod 310 is fixedly connected to the inner wall of the lower mold 2. The top block 311 is in contact with the inner wall of the lower mold 2. The moving rod 303 is in contact with the inner wall of the lower mold 2. One end of the elastic member A306 is fixedly connected to the outer wall of the triangular block 307. The other end of the elastic member A306 is fixedly connected to the inner wall of the moving rod 303. The triangular block 307 is slidably connected in the inner wall of the moving rod 303. The triangular block 307 is in contact with the outer wall of the arc-shaped block 302. One end of the pulling rope 305 is fixedly connected to the outer wall of the housing 1. The other end of the pulling rope 305 is fixedly connected to the outer wall of the triangular block 307.

[0024] Adopting the above solution: Under normal conditions, the return spring 309 positions the moving rod 303 at a certain position due to its own elastic force. The trapezoidal block 308 and the top block 311 are both in a fixed state. The connecting rod 310 contacts the short-side inclined surface of the trapezoidal block 308, driving the two groups of lower molds 2 to be in a combined state. When the driving module 7 moves the upper mold 6 and the fixed rod 301 downward, the arc-shaped block 302 presses against the inclined surface of the triangular block 307, causing the triangular block 307 to move into the inner wall of the moving rod 303 and compressing the elastic member A306. When the upper mold 6 and the lower mold 2 are fully closed, the arc-shaped block 302 moves below the triangular block 307, and the triangular block 307 resets under the elastic force of the elastic member A306. When the driving module 7 moves the upper mold 6 upward, the arc-shaped block 302 contacts the bottom straight surface of the triangular block 307 and drives the triangular block 307 to move upward synchronously. The triangular block 307 drives the moving rod 303, the trapezoidal block 308, and the top block 311 to move upward synchronously, stretching the return spring 309. The top block 311 can eject the pressed material in the lower mold 2, and when the trapezoidal block 308 moves, its inclined surface presses against the two sides of the lower mold 2, causing the two groups of lower molds 2 to move outward simultaneously and separate from the material in contact, making it easier to demold and preventing the material from adhering to the mold cavity of the lower mold 2 and being inconvenient to take out.

[0025] As Figures 2 to 4 shown, when the moving rod 303 moves upward, the runner 304 moves along the outer wall of the pulling rope 305, causing the pulling rope 305 to be stressed and pull the triangular block 307 into the inner wall of the moving rod 303 and gradually separate from the arc-shaped block 302. When the arc-shaped block 302 is completely separated from the triangular block 307, the return spring 309 drives the moving rod 303, the trapezoidal block 308, and the top block 311 to move downward and reset due to its own elastic force. The two side connecting rods 310 move toward the middle along the inclined surface of the trapezoidal block 308, driving the two groups of lower molds 2 to move and close together, returning to the initial state. Thus, during demolding, the material can be automatically ejected, and the material will not adhere to the inside of the lower mold 2, making it more convenient for the operator to take.

[0026] As Figure 5 shown, a slant block 403 is slidably connected to the inner wall of the connecting plate 401. A slide rod 402 is fixedly connected to the outer wall of the slant block 403. A short rod 406 is slidably connected to the inner wall of the connecting plate 401. A groove 9 is formed on the outer wall of the upper mold 6.

[0027] Adopting the above solution: There are two groups of slant blocks 403, and both groups of slant blocks 403 are connected to the outer wall of the slide rod 402. The front outer wall of the slide rod 402 penetrates the outer wall of the connecting plate 401. Pressing the slide rod 402 can drive the two groups of slant blocks 403 to move into the inner wall of the connecting plate 401. Under normal conditions, the elastic force of the elastic member B404 keeps the square block 405 in a popped state and can be engaged with the groove 9 to fix the upper mold 6. At this time, the square block 405 drives the short rod 406 to contact the long-side inclined surface of the slant block 403.

[0028] As Figure 5 shown, one end of the short rod 406 is fixedly connected to the outer wall of the square block 405, the other end of the short rod 406 is slidably connected to the outer wall of the inclined block 403, and the connecting plate 401 is fixedly connected to the output shaft of the driving module 7; one end of the elastic member B404 is fixedly connected to the outer wall of the square block 405, the other end of the elastic member B404 is fixedly connected to the inner wall of the connecting plate 401, the square block 405 is slidably connected in the inner wall of the connecting plate 401, and the square block 405 is snap-connected to the groove 9.

[0029] With the above solution: when the sliding rod 402 is pressed inward, the inclined block 403 moves inward synchronously, and the short rod 406 moves along the inclined surface of the inclined block 403. Since the short rod 406 can only move horizontally in the inner wall of the connecting plate 401, when the short rod 406 moves to the short-side inclined surface of the inclined block 403, it will drive the square block 405 to move synchronously into the inner wall of the connecting plate 401. At this time, the square block 405 will be disengaged from the groove 9, and the upper mold 6 can be removed; and when the square block 405 is in the inner wall of the connecting plate 401, the upper mold 6 can also be inserted upward into the connecting plate 401 so that the groove 9 corresponds to the position of the square block 405. Then release the sliding rod 402, and the elastic force of the elastic member B404 causes the square block 405 to pop out and snap into the groove 9, and the fixation of the upper mold 6 can be completed, and the operation is convenient and fast.

[0030] As Figure 6 shown, a through groove 8 is formed in the outer wall of the housing 1, the cross bar 502 is elastically connected to the inner wall of the housing 1 through a telescopic spring 501, a collecting box 505 is arranged on the inner wall of the housing 1, and a slot 506 is formed in the inner wall of the collecting box 505. A convex block 503 is fixedly connected to the outer wall of the cross bar 502.

[0031] With the above solution: the through groove 8 is arranged around the lower mold 2. When the powder is poured into the lower mold 2, some powder will fall on the housing 1. At this time, the operator can use an external tool to scrape the powder to the through groove 8, and it will fall downward from the through groove 8 into the collecting box 505 for centralized collection, without the need to hold a container while scraping the powder for collection; the collecting box 505 is snap-connected and fixed to the inner wall of the housing 1 through a wedge block 504, and the inclined surface of the wedge block 504 always faces the outside of the housing 1.

[0032] As Figure 6 shown, one end of the telescopic spring 501 is fixedly connected to the outer wall of the cross bar 502, the other end of the telescopic spring 501 is fixedly connected to the inner wall of the housing 1, the convex block 503 penetrates the outer wall of the housing 1, the wedge block 504 is snap-connected to the slot 506, and the cross bar 502 is slidably connected in the inner wall of the housing 1.

[0033] Adopting the above solution: The bump 503 protrudes from the outer wall of the housing 1. The bump 503 can be pressed downward to drive the cross bar 502 to move synchronously. At this time, the cross bar 502 will drive the wedge block 504 to move downward and disengage from the slot 506, and then the collection box 505 can be taken out to process the powder inside; when inserting the collection box 505 for fixation, the collection box 505 can be directly moved into the inner wall of the housing 1. The outer wall of the collection box 505 presses against the inclined surface of the wedge block 504, causing the wedge block 504 and the cross bar 502 to move downward and compress the telescopic spring 501. After the collection box 505 is completely inserted into the inner wall of the housing 1, the positions of the slot 506 and the wedge block 504 correspond to each other. Then, under the elastic force of the telescopic spring 501, the cross bar 502 and the wedge block 504 move upward, and the wedge block 504 is inserted into the slot 506 to complete the fixation of the collection box 505 so that it will not fall off.

[0034] The working principle and usage process of the present invention: When the two lower molds 2 are in a combined state, pour the PTC ceramic powder into the mold cavity of the lower mold 2. Some of the powder will scatter onto the working table of the housing 1. The operator can use an external tool to scrape the powder on the working table of the housing 1 to the through groove 8, and it will fall into the lower collection box 505 through the through groove 8 for centralized collection.

[0035] Then, drive the upper mold 6 to move downward through the driving module 7. The arc-shaped block 302 moves downward with the fixed rod 301 and presses against the inclined surface of the triangular block 307, causing the triangular block 307 to retract into the moving rod 303 and compress the elastic member A306; when the upper mold 6 and the lower mold 2 are completely closed, the arc-shaped block 302 moves below the triangular block 307, and the elastic member A306 resets, and the triangular block 307 returns to the popped state. At this time, the upper mold 6 applies pressure to the powder in the lower mold 2 to complete dry pressing and forming.

[0036] After the pressure holding ends, the driving module 7 drives the upper mold 6 to move upward. The fixed rod 301 drives the arc-shaped block 302 to move upward synchronously. The straight surface at the bottom end of the arc-shaped block 302 contacts the triangular block 307, pushing the triangular block 307, the moving rod 303, the trapezoidal block 308, and the top block 311 upward to stretch the return spring 309; when the trapezoidal block 308 moves upward, its inclined surface presses against the two connecting rods 310 on both sides, causing the two lower molds 2 to separate to both sides. At the same time, the top block 311 ejects the formed blank from the bottom end of the mold cavity of the lower mold 2 to prevent the blank from adhering to the mold.

[0037] During the upward movement of the moving rod 303, the runner 304 rolls along the pulling rope 305. The pulling rope 305 is stressed to pull the triangular block 307 to gradually retract into the moving rod 303 until the arc surface block 302 is completely separated from the triangular block 307. At this time, the elastic force of the return spring 309 drives the moving rod 303, the trapezoidal block 308 and the top block 311 to move downward for reset. The two connecting rods 310 slide along the inclined surface of the trapezoidal block 308 to push the lower die 2 to merge again. Then, the operator can conveniently take out the demolded blank and enter the next process, without sticking to the mold cavity of the lower die 2 and without being inconvenient to take out in the mold cavity.

[0038] After the batch production is completed, press the convex block 503 to disengage from the slot 506 and take out the collection box 505. Pour out the powder for recycling. Then, push the collection box 505 along the inner wall of the housing 1. The outer wall of the collection box 505 presses the inclined surface of the wedge block 504 to move the cross bar 502 downward to compress the spring. When the collection box 505 is completely inserted, the slot 506 is aligned with the wedge block 504, and the elastic force of the spring pushes the cross bar 502 upward, and the wedge block 504 is clamped into the slot 506 to fix the collection box.

[0039] When the upper die 6 needs to be removed for maintenance after long-term use, the sliding rod 402 can be pressed inward to drive the inclined surface block 403 to move toward the inner wall of the connecting plate 401. The short rod 406 slides along the inclined surface of the inclined surface block 403 to push the square block 405 to compress the elastic member B404 and retract into the connecting plate 401, so that the square block 405 is disengaged from the groove 9 of the upper die 6, and the upper die 6 is removed. After the maintenance is completed, press the sliding rod 402 in the same way. Insert the upper die 6 below the connecting plate 401, align the groove 9 with the position of the square block 405, and the elastic force of the elastic member B404 pushes the square block 405 to pop out and be clamped into the groove 9 to complete the fixation of the upper die 6.

[0040] It should be noted that in this article, relational terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the term "comprising", "including" or any other variant thereof is intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements not only includes those elements, but also includes other elements not expressly listed, or also includes elements inherent to such process, method, article or device.

[0041] Although the embodiments of the present invention have been shown and described, it will be understood by those of ordinary skill in the art that various changes, modifications, substitutions and variations can be made in these embodiments without departing from the principles and spirit of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A dry pressing forming machine for preparing PTC ceramic heater powder, comprising a housing (1), characterized in that: It further includes: A lower mold (2) is provided on the outer wall of the housing (1), and a demolding mechanism (3) is provided on the inner wall of the lower mold (2); A driving module (7) is provided on the outer wall of the top end of the housing (1), and an upper mold (6) is provided at the movable end of the driving module (7) through a connecting mechanism (4); A collecting mechanism (5) is provided in the inner wall of the housing (1); Among them, the demolding mechanism (3) includes a moving rod (303), and a triangular block (307) is elastically connected to the inner wall of the moving rod (303) through an elastic member A (306); The connecting mechanism (4) includes a connecting plate (401), and a square block (405) is elastically connected to the inner wall of the connecting plate (401) through an elastic member B (404); The collecting mechanism (5) includes a cross bar (502), and a wedge-shaped block (504) is fixedly connected to the outer wall of the cross bar (502).

2. The dry pressing forming machine for preparing PTC ceramic heater powder according to claim 1, characterized in that: A fixed rod (301) is fixedly connected to the outer wall of the driving module (7), an arc-shaped block (302) is fixedly connected to the outer wall of the bottom end of the fixed rod (301), a runner (304) is rotatably connected to the inner wall of the moving rod (303), a pull rope (305) is wound around the outer wall of the runner (304), a trapezoidal block (308) is fixedly connected to the outer wall of the top end of the moving rod (303), the trapezoidal block (308) is elastically connected to the outer wall of the housing (1) through a return spring (309), a connecting rod (310) is slidably connected to the outer wall of the trapezoidal block (308), and a top block (311) is fixedly connected to the outer wall of the top end of the trapezoidal block (308).

3. The dry pressing forming machine for preparing PTC ceramic heater powder according to claim 2, characterized in that: The lower mold (2) is slidably connected to the outer wall of the housing (1), the connecting rod (310) is fixedly connected to the inner wall of the lower mold (2), the top block (311) is in contact with the inner wall of the lower mold (2), and the moving rod (303) is in contact with the inner wall of the lower mold (2).

4. The dry pressing forming machine for preparing PTC ceramic heater powder according to claim 2, characterized in that: One end of the elastic member A (306) is fixedly connected to the outer wall of the triangular block (307), the other end of the elastic member A (306) is fixedly connected to the inner wall of the moving rod (303), the triangular block (307) is slidably connected in the inner wall of the moving rod (303), and the triangular block (307) is in contact with the outer wall of the arc-shaped block (302).

5. The dry pressing forming machine for preparing PTC ceramic heater powder according to claim 2, characterized in that: One end of the pull rope (305) is fixedly connected to the outer wall of the housing (1), and the other end of the pull rope (305) is fixedly connected to the outer wall of the triangular block (307).

6. The dry pressing machine for preparing PTC ceramic heater powder according to claim 1, characterized in that: A slope block (403) is slidably connected to the inner wall of the connecting plate (401), a sliding rod (402) is fixedly connected to the outer wall of the slope block (403), a short rod (406) is slidably connected to the inner wall of the connecting plate (401), and a groove (9) is formed in the outer wall of the upper mold (6).

7. The dry pressing forming machine for preparing PTC ceramic heater powder according to claim 6, characterized in that: One end of the short rod (406) is fixedly connected to the outer wall of the square block (405), the other end of the short rod (406) is slidably connected to the outer wall of the slope block (403), and the connecting plate (401) is fixedly connected to the output shaft of the driving module (7).

8. The dry pressing forming machine for preparing PTC ceramic heater powder according to claim 6, characterized in that: One end of the elastic member B (404) is fixedly connected to the outer wall of the square block (405), and the other end of the elastic member B (404) is fixedly connected to the inner wall of the connecting plate (401). The square block (405) is slidably connected in the inner wall of the connecting plate (401), and the square block (405) is engaged with the groove (9).

9. The dry pressing forming machine for preparing PTC ceramic heater powder according to claim 1, characterized in that: A through groove (8) is formed in the outer wall of the housing (1). The cross bar (502) is elastically connected to the inner wall of the housing (1) through a telescopic spring (501). A collection box (505) is arranged on the inner wall of the housing (1). A slot (506) is formed in the inner wall of the collection box (505). A convex block (503) is fixedly connected to the outer wall of the cross bar (502).

10. The dry pressing molding machine for preparing PTC ceramic heater powder according to claim 9, characterized in that: One end of the telescopic spring (501) is fixedly connected to the outer wall of the cross bar (502), and the other end of the telescopic spring (501) is fixedly connected to the inner wall of the housing (1). The convex block (503) penetrates through the outer wall of the housing (1). The wedge-shaped block (504) is engaged with the slot (506), and the cross bar (502) is slidably connected in the inner wall of the housing (1).

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