Vacuum hot pressing equipment

Abstract

The utility model discloses vacuum hot-pressing equipment which comprises a mounting frame, a vacuum cavity arranged on the mounting frame and a vacuum cavity door connected with the vacuum cavity, and further comprises an upper hot-pressing assembly and a lower hot-pressing assembly which are oppositely arranged, and a graphite cylinder located between the upper hot-pressing assembly and the lower hot-pressing assembly. A hydraulic cylinder is arranged at the top of the upper hot pressing assembly, a pressure platform is arranged between the hydraulic cylinder and the upper hot pressing assembly, and a weighing sensor is arranged on the pressure platform; and a temperature measuring through hole for inserting a temperature measuring sensor is formed in the middle of the lower hot-pressing assembly. The weighing sensor measures the actual pressure, when the measured pressure changes, the system carries out feedback, the pressure is increased or reduced by adjusting the servo oil supply speed of the hydraulic station in real time, the graphite mold is prevented from being exploded, and meanwhile the temperature measuring sensor extends into the temperature measuring through hole to measure the actual temperature. And the power supply output is adjusted in real time according to the temperature measurement condition to control the temperature, so that high-precision temperature control is realized.

Description

Technical Field

[0001] The utility model relates to the technical field of hot pressing equipment, and more specifically to a vacuum hot pressing equipment. Background Art

[0002] Vacuum hot pressing equipment consists of several parts: heating system, pressure system, temperature measurement system, control system, vacuum system, etc. Vacuum hot pressing equipment is a vertical electrical equipment that uses graphite as a heating element. It is widely used in hot pressing and sintering of metal compounds, ceramics, inorganic compounds, nanomaterials, etc. under high temperature and high vacuum conditions or in a protective atmosphere. However, it is difficult to carry out sintering and pressing of traditional vacuum hot pressing and sintering equipment in the prior art simultaneously. Even if it is carried out simultaneously, it is even more difficult to maintain the stability of high-pressure sintering.

[0003] In the prior art, the pressure of the vacuum hot pressing system is supplied by the hydraulic station. Similar products use graphite heating, and only use the hydraulic station output oil pressure as the pressure feedback monitoring point. Due to the structural properties of graphite itself, inaccurate pressure measurement often causes the graphite mold to burst during heating, resulting in heating failure. At the same time, inaccurate temperature measurement is also a factor that causes the graphite mold to burst. Utility Model Content

[0004] The purpose of the utility model is to provide a vacuum hot pressing device to solve the technical problems existing in the above-mentioned background technology.

[0005] The utility model provides a vacuum hot pressing device, comprising a mounting frame, a vacuum chamber arranged on the mounting frame and a vacuum chamber door connected to the vacuum chamber, and also comprising an upper hot pressing assembly, a lower hot pressing assembly, and a graphite cylinder located between the upper hot pressing assembly and the lower hot pressing assembly.

[0006] A hydraulic cylinder is arranged on the top of the upper hot pressing assembly, a pressure platform is arranged between the hydraulic cylinder and the upper hot pressing assembly, and a weighing sensor is arranged on the pressure platform; a temperature measuring through hole for inserting a temperature measuring sensor is arranged in the middle of the lower hot pressing assembly.

[0007] In a preferred embodiment, a top sealing bellows is provided at the connection between the upper hot pressing assembly and the vacuum chamber, a bottom sealing bellows is provided at the connection between the lower hot pressing assembly and the vacuum chamber, and a support rod is provided at the bottom of the vacuum chamber.

[0008] In a preferred embodiment, the upper hot pressing assembly and the lower hot pressing assembly both include a copper electrode, a graphite base, a graphite connecting column, a graphite mounting block, a graphite pressure head and a graphite plate which are sequentially connected and arranged, and the graphite plate extends into the graphite cylinder.

[0009] In a preferred embodiment, the temperature measuring through hole on the lower hot pressing assembly extends from the copper electrode to below the graphite plate.

[0010] In a preferred embodiment, insulating gaskets are provided between the pressure platform and the copper electrode of the upper hot pressing assembly, and between the mounting frame and the copper electrode of the lower hot pressing assembly.

[0011] In a preferred embodiment, a guide rod 1 is provided on the mounting frame, a guide plate with a guide hole is provided on the pressure platform, and the guide rod 1 is provided with the guide hole.

[0012] In a preferred embodiment, a guide bearing is provided on one side of the vacuum chamber, and a second guide rod is fixedly provided on the vacuum chamber door, and the second guide rod passes through the guide bearing.

[0013] In a preferred embodiment, an observation window is provided on the front side of the vacuum chamber door.

[0014] The beneficial effects of the technical solution of the utility model are:

[0015] The weighing sensor measures the actual pressure. When the measured pressure changes, the system will give feedback and increase or decrease the pressure by adjusting the servo oil supply speed of the hydraulic station in real time to avoid the graphite mold from bursting. At the same time, the temperature sensor is inserted into the temperature measuring hole to measure the actual temperature. The power output is adjusted in real time according to the temperature measurement situation to control the temperature, thereby achieving high-precision temperature control. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 This is a schematic diagram of the overall structure of the utility model.

[0017] Figure 2 This is a schematic diagram of the overall structure of the utility model from another perspective.

[0018] Figure 3 This is a cross-sectional view of the utility model.

[0019] Figure 4 For this utility model Figure 3 Enlarged view of area A in the middle.

[0020] Explanation of the reference numerals: 1 mounting frame, 2 vacuum chamber, 3 vacuum chamber door, 4 upper hot pressing assembly, 5 lower hot pressing assembly, 6 copper electrode, 7 graphite base, 8 graphite connecting column, 9 graphite mounting block, 10 graphite pressure head, 11 graphite plate, 12 insulating gasket, 13 graphite cylinder, 14 hydraulic cylinder, 15 pressure platform, 16 weighing sensor, 17 temperature measuring through hole, 18 top sealing bellows, 19 bottom sealing bellows, 20 support rod, 21 guide rod 1, 22 guide plate, 23 guide bearing, 24 guide rod 2, 25 observation window. DETAILED DESCRIPTION

[0021] The present invention is further described in detail below in conjunction with the accompanying drawings and specific embodiments. The embodiments of the present invention are provided for the sake of illustration and convenience of description, and are not intended to be exhaustive or to limit the present invention to the disclosed forms. Many modifications and variations are obvious to those of ordinary skill in the art. The embodiments are selected and described in order to better illustrate the principles and practical applications of the present invention, and to enable those of ordinary skill in the art to understand the present invention and thereby design various embodiments with various modifications suitable for specific purposes.

[0022] like Figure 1-Figure 4 As shown, the technical solution of the utility model provides a vacuum hot pressing device, including a mounting frame 1, a vacuum chamber 2 arranged on the mounting frame 1, and a vacuum chamber door 3 connected to the vacuum chamber 2, and also including an upper hot pressing assembly 4, a lower hot pressing assembly 5, and a graphite cylinder 13 located between the upper hot pressing assembly 4 and the lower hot pressing assembly 5. The hot pressing work is completed in the vacuum chamber 2. During the hot pressing, the powdered sample is placed in the graphite cylinder 13, the lower hot pressing assembly 5 is fixed, and the upper hot pressing assembly 4 moves downward to generate a certain pressure on the powdered material. At the same time, the upper hot pressing assembly 4 and the lower hot pressing assembly 5 are powered on to generate heat, and the sample is hot pressed and sintered.

[0023] A hydraulic cylinder 14 is provided on the top of the upper hot pressing assembly 4, a pressure platform 15 is provided between the hydraulic cylinder 14 and the upper hot pressing assembly, and a weighing sensor 16 is provided on the pressure platform 15; a temperature measuring through hole 17 for inserting a temperature measuring sensor is provided in the middle of the lower hot pressing assembly. During the hot pressing sintering process, the hydraulic cylinder 14 drives the weighing sensor 16 to move downward synchronously to apply a certain pressure to the sample, and the weighing sensor 16 measures the actual pressure at the same time. When the pressure measured by it changes, the system gives feedback, and increases or decreases the pressure by adjusting the servo oil supply speed of the hydraulic station in real time to avoid the graphite mold from bursting. At the same time, the temperature measuring sensor extends into the temperature measuring through hole 17 to measure the actual temperature, and adjusts the power output in real time according to the temperature measurement situation to control the temperature, thereby achieving high-precision temperature control.

[0024] A top sealing bellows 18 is provided at the connection between the upper hot pressing assembly 4 and the vacuum chamber 2, a bottom sealing bellows 19 is provided at the connection between the lower hot pressing assembly 5 and the vacuum chamber 2, and a support rod 20 is provided at the bottom of the vacuum chamber 2. The top sealing bellows 18 and the bottom sealing bellows 19 can achieve sealing between the upper hot pressing assembly 4 and the lower hot pressing assembly 5 and the vacuum chamber 2, and at the same time provide movement space for the lifting movement of the upper hot pressing assembly 4 through telescoping.

[0025] The upper hot pressing assembly 4 and the lower hot pressing assembly 5 both include copper electrodes 6, graphite bases 7, graphite connecting columns 8, graphite mounting blocks 9, graphite pressure heads 10 and graphite plates 11 which are sequentially connected and arranged, and the graphite plates 11 extend into the graphite cylinder 13. During hot pressing sintering, the hydraulic cylinder 14 drives the upper hot pressing assembly 4 to move downward until the graphite plates 11 contact the sample and pressurize it to a specified pressure, and at the same time, the power supply starts to output current, which is transmitted to the graphite plates 11 through the copper electrodes 6, and the temperature in the graphite cylinder 11 starts to rise. The temperature and pressure state are real-time dynamic processes, and hot pressing sintering of the sample is achieved.

[0026] The temperature measuring through hole 17 on the lower hot pressing assembly 5 extends from the copper electrode 6 to the bottom of the graphite plate 11. The above arrangement is convenient for installation and the measured temperature is more accurate.

[0027] Insulating gaskets 12 are provided between the pressure platform 15 and the copper electrode 6 of the upper hot-pressing assembly 4 and between the mounting frame 1 and the copper electrode 6 of the lower hot-pressing assembly 5 to play an insulating role.

[0028] The mounting frame 1 is provided with a guide rod 21, and the pressure platform 15 is provided with a guide plate 22 with a guide hole, and the guide rod 21 is provided with the guide hole. The guide rod 21 cooperates with the guide plate 22 to ensure that the upper hot pressing assembly 4 is lifted and lowered smoothly.

[0029] A guide bearing 23 is provided on one side of the vacuum chamber 2, and a guide rod 24 is fixedly provided on the vacuum chamber door 3, and the guide rod 24 passes through the guide bearing 23. When the vacuum chamber door 3 is opened, it is guided by the guide bearing 23, and after closing, it is fixed by the pressure plate. The vacuum chamber door 3 adopts the above-mentioned opening and closing method to ensure airtightness.

[0030] The front side of the vacuum chamber door 3 is provided with an observation window 25 for conveniently observing the internal conditions of the chamber.

[0031] Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field and related fields without creative work should fall within the scope of protection of the present invention. Structures, devices and operating methods not specifically described and explained in the present invention shall be implemented according to conventional means in the field unless otherwise specified and limited.

Claims

1. A vacuum hot pressing device, comprising a mounting frame, a vacuum chamber disposed on the mounting frame, and a vacuum chamber door connected to the vacuum chamber, characterized in that: It also includes an upper hot pressing assembly, a lower hot pressing assembly, and a graphite cylinder located between the upper hot pressing assembly and the lower hot pressing assembly. A hydraulic cylinder is arranged on the top of the upper hot pressing assembly, a pressure platform is arranged between the hydraulic cylinder and the upper hot pressing assembly, and a weighing sensor is arranged on the pressure platform; a temperature measuring through hole for inserting a temperature measuring sensor is arranged in the middle of the lower hot pressing assembly.

2. A vacuum hot pressing device according to claim 1, characterized in that: A top sealing bellows is provided at the connection between the upper hot pressing assembly and the vacuum cavity, a bottom sealing bellows is provided at the connection between the lower hot pressing assembly and the vacuum cavity, and a support rod is provided at the bottom of the vacuum cavity.

3. The vacuum hot pressing equipment according to claim 1, characterized in that: The upper hot pressing assembly and the lower hot pressing assembly both include a copper electrode, a graphite base, a graphite connecting column, a graphite mounting block, a graphite pressing head and a graphite plate which are sequentially connected and arranged, and the graphite plate extends into the graphite cylinder.

4. A vacuum hot pressing device according to claim 3, characterized in that: The temperature measuring through hole on the lower hot pressing assembly extends from the copper electrode to below the graphite plate.

5. The vacuum hot pressing equipment according to claim 3, characterized in that: Insulating gaskets are arranged between the pressure platform and the copper electrode of the upper hot pressing assembly, and between the mounting frame and the copper electrode of the lower hot pressing assembly.

6. The vacuum hot pressing equipment according to claim 1, characterized in that: The mounting frame is provided with a guide rod 1, the pressure platform is provided with a guide plate with a guide hole, and the guide rod 1 is provided with the guide hole.

7. The vacuum hot pressing equipment according to claim 1, characterized in that: A guide bearing is arranged at one side of the vacuum chamber body, and a second guide rod is fixedly arranged on the vacuum chamber door, and the second guide rod passes through the guide bearing.

8. The vacuum hot pressing equipment according to claim 1, characterized in that: An observation window is arranged on the front side of the vacuum chamber door.

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