CN220626024U

CN220626024U - Powder yield strength analyzer

Info

Publication number: CN220626024U
Application number: CN202322273963.6U
Authority: CN
Inventors: 刘海涛; 曾令长
Original assignee: Ningbo Ruike Micro Intelligent Technology Co ltd
Current assignee: Ningbo Ruike Micro Intelligent Technology Co ltd
Priority date: 2023-08-23
Filing date: 2023-08-23
Publication date: 2024-03-19
Anticipated expiration: 2033-08-23

Abstract

The utility model relates to a powder yield strength analyzer, which comprises a die, a first pressure sensor and a second pressure sensor; the die comprises a die holder, a die cylinder and a first ejector rod, wherein the die cylinder is provided with a die cavity hole, the die cylinder is placed on the die holder when in use, a sample is poured into the die cavity hole, the first ejector rod is placed in the die cavity hole, the die holder is placed on the first pressure sensor, the first ejector rod presses down the sample to enable the sample to be solid, the die holder is removed after that, the first ejector rod is placed on the first pressure sensor, the first ejector rod pushes out the sample solid to be in contact with the second pressure sensor and is crushed, and the flow characteristic of the powder is analyzed and evaluated through the maximum value of the pressure value of the first pressure sensor and the maximum value of the second pressure sensor. The utility model has the advantages of simple structure, convenient operation, convenient measurement of the main stress of the powder solid block and the corresponding unconfined yield strength stress, and the like.

Description

Powder yield strength analyzer

Technical Field

The utility model relates to the technical field of powder performance testing instruments, in particular to a powder yield strength analyzer.

Background

The powder yield strength is obtained by fixing one or more main stresses on powder, then giving unconfined yield strength stress on the fixed blocks to damage the fixed blocks, analyzing and evaluating the flow characteristics of the powder through the relation between the main stresses and the yield strength stress, and providing data support for design and research of storage, transportation, transmission, tabletting technology, mixing, agglomeration, bridging, non-flow phenomenon and the like of the powder. Generally, when the principal stress of a powder solid mass is greater than the unconfined yield strength stress required to break the solid mass, the free flow properties of the powder are characterized as low; whereas the free flow of the powder is high.

At present, a funnel flow measurement method is commonly used, the funnel flow measurement method is suitable for powder with strong fluidity, the powder with poor fluidity is poor in repeatability and comparability of test results, the single-shaft compression method is adopted for the repeatability analysis, and compared with the funnel flow measurement method, the single-shaft compression method is used for more intuitively representing the fluidity of the powder and has wider adaptability.

At present, no better analysis instrument is adopted for measuring the powder yield strength by adopting a uniaxial compression method, and therefore, an instrument capable of conveniently measuring the powder yield strength needs to be designed.

Disclosure of Invention

Therefore, the utility model provides a powder yield strength analyzer, which mainly solves the problem of measuring the main stress of a powder solid block and the unconfined yield strength stress required by destroying the corresponding solid block, thereby facilitating the analysis of the relation between the main stress and the yield strength stress, and providing data support for the design and research of powder storage, transportation, transmission, tabletting process, mixing, powder agglomeration, bridging, non-flowing phenomenon and the like.

In order to achieve the above object, the present utility model provides the following technical solutions:

a powder yield strength analyzer comprises a bracket and a die; a placing plate is arranged at the top of the bracket; guide rods are arranged on the left side and the right side of the top of the placing plate; the guide rod is provided with a top plate; the bottom of the top plate is provided with a second pressure sensor; the placing plate is movably provided with a lifting seat; the top of the lifting seat is provided with a first pressure sensor; the lifting device is used for driving the lifting seat to ascend or descend; the die comprises a die holder, a die cylinder and a first ejector rod; the die holder comprises a die holder body; the die holder body is provided with a die holder embedding part; one side of the die cylinder is provided with a die cavity hole for placing a sample, and the other side of the die cylinder is provided with a die cylinder embedding hole communicated with the die cavity hole; the aperture and the depth of the die cylinder embedding hole are matched with the outer diameter and the length of the die holder embedding part, and the die holder embedding part can be embedded into the die cylinder embedding hole; the first ejector rod is provided with a first rod body; the diameter of the first rod body is matched with the aperture of the die cavity hole, and the first rod body can be inserted into the die cavity hole and is used for extruding a sample placed in the die cavity hole; the combined body of the die holder, the die cylinder and the first ejector rod is placed on the first pressure sensor, the first ejector rod is attached to the bottom surface of the top plate, under the action of the lifting seat, a sample compression fixed block placed in a die cavity hole or the first ejector rod and the die cylinder combined body are placed on the first pressure sensor, the die cylinder faces one side of the bottom surface of the top plate, under the action of the lifting seat, a sample of the compression fixed block in the die cavity hole is attached to the second pressure sensor, and the sample of the compression fixed block in the die cavity hole is crushed.

Preferably, the device further comprises a pressing block; the diameter of the pressing block is matched with the aperture of the die cavity hole, and the pressing block can be placed in the die cavity hole.

Preferably, the guide rod below the top plate is provided with a limiting plate; the limiting plate is provided with a placing groove; an embedded groove is formed in the side wall of the placing groove; the side wall of the mold cylinder is provided with a raised mold cylinder embedding part which is matched with the embedding groove; the mold cylinder embedding part can be embedded into the embedding groove.

Preferably, the limiting plate is slidably arranged on the guide rod; a spring is sleeved on the guide rod between the limiting plate and the placing plate; the bottom of the limiting plate is provided with a handle.

Preferably, the top plate is connected with an adjusting button in a threaded manner; the adjusting button bottom surface with the limiting plate top surface is tangential, rotatory adjusting button is used for adjusting the roof with the distance between the limiting plate.

Preferably, the device further comprises a second ejector rod; the second ejector rod is provided with a second rod body; the second rod body length is greater than the first rod body length; the diameter of the second rod body is matched with the aperture of the die cavity hole, and the second rod body can be inserted into the die cavity hole; the second ejector rod and the die cylinder assembly are placed on the first pressure sensor, the die cylinder faces to one side of the bottom surface of the top plate, under the action of the lifting seat, the sample of the compression fixed block in the die cavity hole is attached to the second pressure sensor, and the sample of the compression fixed block in the die cavity hole is crushed.

Preferably, the die holder body is provided with a first air hole with an orifice positioned on the side wall of the die holder body; the die holder embedding part is provided with a second air hole with an orifice positioned on the top surface; the first air hole is communicated with the second air hole; when the die holder and the die cylinder are assembled together, the second air hole is communicated with the die cavity hole.

Preferably, a sealing ring is sleeved on the outer wall of the die holder embedding part.

Optionally, the lifting device comprises a motor arranged at the bottom of the bracket and a gearbox connected with the motor; a support plate is arranged on the support below the placing plate; the supporting plate is connected with a screw rod through threads; one end of the screw rod is connected with the output shaft of the gearbox, and the other end of the screw rod is rotatably connected with the lifting column; the top surface of the lifting column is connected with the top surface of the lifting seat.

Preferably, a buffer spring is arranged between the lifting column and the lifting seat.

Optionally, the control unit is provided with a main stress presetting unit and a graph drawing unit; the main stress preset unit is used for inputting a main stress value; the control unit is respectively and electrically connected with the first pressure sensor, the second pressure sensor and the lifting device; the control unit acquires the values of the first pressure sensor and the second pressure sensor, and sends a shutdown instruction to the lifting device when the value of the first pressure sensor is consistent with the main pressure value input by the preset unit, and sends the value of the first pressure sensor to the graph drawing unit, or sends the shutdown instruction to the lifting device when the value of the second pressure sensor is reduced, and sends the maximum value of the second pressure sensor to the graph drawing unit; the graph plotting unit receives the values of the first pressure sensor and the second pressure sensor and plots the relationship curves of the first pressure sensor and the second pressure sensor.

The utility model has at least the following beneficial effects:

the die comprises a die base, a die cylinder and a first ejector rod, wherein the die base comprises a die base body, the die base body is provided with a die base embedded part, one side of the die cylinder is provided with a die cavity hole, the other side of the die cylinder is provided with a die cylinder embedded hole, the first ejector rod is provided with a first rod body, and the first rod body can be inserted into the die cavity hole. The test analysis is as follows: placing a die cylinder on a die holder, pouring a fixed amount of powder sample into a die cavity hole, placing a first ejector rod into the die cavity hole, placing the die holder on a first pressure sensor, pressing down the sample by the first ejector rod under the action of a lifting device to enable a sample fixing block, and ending the sample fixing block when the pressure value of the first pressure sensor is consistent with the pressure value of a preset main stress fixing block; and removing the die holder, placing the first ejector rod to the first pressure sensor, pushing the sample solid block out of the die cavity hole by the first ejector rod under the action of the lifting device, contacting with the second pressure sensor, crushing, and analyzing and evaluating the flow characteristic of the powder through the maximum values of the pressure value of the first pressure sensor and the second pressure sensor.

Therefore, the powder yield strength analyzer has the advantages of simple structure, convenience in operation, capability of conveniently measuring the main stress of the powder solid block and the unconfined yield strength stress required by destroying the corresponding solid block, and the like.

Drawings

In order to more clearly illustrate the prior art and the present utility model, the drawings used in the description of the prior art and the embodiments of the present utility model will be briefly described. It will be apparent to those skilled in the art that the drawings in the following description are merely exemplary and that other drawings may be derived from the drawings provided without the inventive effort to those skilled in the art.

The structures, proportions, sizes, etc. shown in the present specification are shown only for the purposes of illustration and description, and are not intended to limit the scope of the utility model, which is defined by the claims, for example, modifications, variations in proportions, or otherwise, used in the practice of the utility model, which are particularly adapted to specific environments without departing from the spirit and scope of the utility model.

FIG. 1 is a schematic diagram of a powder yield strength analyzer according to the present utility model;

FIG. 2 is a top view of FIG. 1 of a powder yield strength analyzer of the present utility model;

FIG. 3 is a bottom view of FIG. 2 of a powder yield strength analyzer of the present utility model;

FIG. 4 is a schematic diagram of a die holder and a die of a powder yield strength analyzer according to the present utility model;

FIG. 5 is a bottom view of FIG. 4 of a powder yield strength analyzer of the present utility model;

FIG. 6 is a front cross-sectional view of a die holder, mold of a powder yield strength analyzer of the present utility model;

FIG. 7 is a front cross-sectional view of the assembled state of the die holder, die and carrier of the powder yield strength analyzer of the present utility model;

FIG. 8 is a schematic diagram of the compression state of a sample of a powder yield strength analyzer according to the present utility model;

FIG. 9 is a schematic diagram of a sample crushing state of a powder yield strength analyzer according to the present utility model;

reference numerals illustrate:

1. a bracket; 2. placing a plate; 3. a lifting seat; 4. a first pressure sensor; 5. a limiting plate; 501. a placement groove; 5011. an embedding groove; 6. a top plate; 7. an adjusting knob; 8. a spring; 9. a handle; 10. a motor; 11. a gearbox; 12. a support plate; 13. a screw rod; 14. lifting columns; 15. a buffer spring; 16. a die holder; 1601. a die holder body; 16011. a first air hole; 1602. a die holder embedding part; 16021. a second air hole; 1603. a seal ring; 17. a mold cylinder; 1701. a cavity hole; 1702. the mould cylinder is embedded into the hole; 1703. a die cylinder embedding part; 18. briquetting; 19. a second ejector rod; 1901. a second rod body; 20. a first ejector rod; 201. a first rod body; 21. a second pressure sensor; 22. a guide rod; 23. and (3) a sample.

Detailed Description

The present application is further described in detail below with reference to the attached drawings.

In the description of the present application: unless otherwise indicated, the meaning of "a plurality" is two or more. The terms "first," "second," "third," and the like in this application are intended to distinguish between the referenced objects without a special meaning in terms of technical connotation (e.g., should not be construed as emphasis on degree or order of importance, etc.). The expressions "comprising", "including", "having", etc. also mean "not limited to" (certain units, components, materials, steps, etc.).

The terms such as "upper", "lower", "left", "right", "middle", and the like, as referred to in this application, are generally used for convenience in visual understanding with reference to the drawings, and are not intended to be an absolute limitation of the positional relationship in actual products. Such changes in relative positional relationship are considered to be within the scope of the present description without departing from the technical concepts disclosed herein.

The utility model relates to a powder yield strength analyzer, as shown in figures 1 to 3, a bracket 1 and a die are arranged, a placing plate 2 is fixedly arranged at the top of the bracket 1, guide rods 22 are fixedly arranged at the left side and the right side of the top of the placing plate 2, a top plate 6 is fixedly arranged at the guide rods 22, a second pressure sensor 21 is arranged at the bottom of the top plate 6, the bottom surface of the second pressure sensor 21 is preferably designed to be on the same plane with the bottom surface of the top plate 6, a lifting seat 3 is movably arranged at the placing plate 2, a first pressure sensor 4 is arranged at the top of the lifting seat 3, a lifting device is also arranged for driving the lifting seat 3 to lift or descend, the die comprises a die holder 16, a die barrel 17 and a first ejector rod 20, the die holder 16 comprises a die holder body 1601, the die holder body 1601 is provided with a die holder embedding part 1602, one side of the die barrel 17 is provided with a die cavity hole 1701, a sample is placed in the die cavity hole 1701, the other side is provided with a die barrel embedding hole 1702 communicated with the die cavity hole 1701, the aperture and depth of the die cylinder embedding hole 1702 are adapted to the outer diameter and length of the die cylinder embedding part 1602, the die cylinder embedding part 1602 is capable of being embedded into the die cylinder embedding hole 1702, the first ejector rod 20 is provided with a first rod body 201, the diameter of the first rod body 201 is adapted to the aperture of the die cavity hole 1701, the first rod body 201 is capable of being inserted into the die cavity hole 1701 for extruding a sample placed in the die cavity hole 1701, the combination of the die holder 16, the die cylinder 17 and the first ejector rod 20 is placed on the first pressure sensor 4, the first ejector rod 20 is attached to the bottom surface of the top plate 6, the sample placed in the die cavity hole 1701 is placed on the first pressure sensor 4 under the action of the lifting seat 3, the die cylinder 17 faces the bottom surface side of the top plate 6, the sample of the compression solid block in the die cavity hole 1701 is attached to the second pressure sensor 21 under the action of the lifting seat 3, and crushing the sample of the compressed solid mass in cavity 1701. The test analysis is as follows: placing the die cylinder 17 onto the die holder 16; pouring a fixed amount of a powder sample into the cavity 1701; placing the first ram 20 into the cavity 1701; placing the combination of the die holder 16 containing the sample 23, the die cylinder 17 and the first ejector rod 20 onto the first pressure sensor 4, the die holder 16 being on the first pressure sensor 4, as shown in fig. 8; the lifting device is started to drive the lifting seat 3 to rise, the combination of the die holder 16, the die cylinder 17 and the first ejector rod 20 is pushed to rise, the top of the first ejector rod 20 is limited by the top plate 6 after that, the first ejector rod 20 presses down the sample to enable the sample to be fixed; when the pressure value of the first pressure sensor 4 is consistent with the preset pressure value of the main stress fixed block, the lifting device descends and resets; taking out the combination of the die holder 16, the die cylinder 17 and the first ejector rod 20, and dismantling the die holder 16; placing the combination of the die cylinder 17 filled with the solid block powder and the first ejector rod 20 on the first pressure sensor 4, the first ejector rod 20 being on the first pressure sensor 4 as shown in fig. 9; the lifting device is started to drive the lifting seat 3 to lift, the combined body of the first ejector rod 20 and the die cylinder 17 is pushed to lift, the rear die cylinder 17 is limited by the top plate 6, the first ejector rod 20 pushes out the sample fixing block from the die cavity hole 1702 and is contacted with the second pressure sensor 21, and at the moment, the periphery of the sample fixing block is free from any limiting support; the lifting device continues to drive the lifting seat 3 to lift, so that the first ejector rod 20 presses the sample fixing block to break, and in the process, the maximum value of the second pressure sensor 21 is the yield strength stress of the sample; subsequently, the flow characteristics of the powder are evaluated analytically by the first pressure sensor 4 pressure value, i.e. the principal stress, and the maximum value of the second pressure sensor 21, i.e. the unconfined yield strength stress of the sample.

Preferably, further comprising a press block 18, the press block 18 diameter and the die cavity aperture 170) aperture fit, the press block 18 may be placed within the die cavity aperture 1701. In use, the mold cylinder 17 is placed on the mold base 16, the sample 23 is poured into the mold cavity hole 1701, the pressing block 18 is placed in the mold cavity hole 1701, and the first ejector rod 20 is placed in the mold cavity hole 1701, so that the mold combination is completed.

Preferably, in order to facilitate the crushing of the sample solid block, the guide rod 22 below the top plate 6 is provided with a limiting plate 5, the limiting plate 5 is provided with a placing groove 501, the side wall of the placing groove 501 is provided with an embedding groove 5011, the side wall of the mold cylinder 17 is provided with a convex mold cylinder embedding part 1703 adapted to the embedding groove 5011, the mold cylinder embedding part 1703 can be embedded into the embedding groove 5011, and when the crushing of the sample solid block is performed, the mold cylinder embedding part 1703 is embedded into the embedding groove 5011, and the mold cylinder 17 is clamped and limited.

Preferably, in order to facilitate the clamping of the die cylinder 17 into the embedded groove 5011, the limiting plate 5 is slidably arranged on the guide rod 22, the spring 8 is sleeved on the guide rod 22 between the limiting plate 5 and the placing plate 2, the handle 9 is arranged at the bottom of the limiting plate 5, and the limiting plate 5 is moved downwards by pulling down the handle 9, so that the die cylinder 17 is clamped into the embedded groove 5011.

Preferably, in order to adjust the distance between the top plate 6 and the limiting plate 5, the top plate 6 is in threaded connection with an adjusting button 7, the bottom surface of the adjusting button 7 is engaged with the top surface of the limiting plate 5, and the adjusting button 7 is rotated to adjust the distance between the top plate 6 and the limiting plate 5.

Preferably, in order to facilitate pushing out the sample solid block from the cavity 1701 and contacting with the second pressure sensor 21 when the sample solid block is crushed, a second ejector 19 is further provided, the second ejector 19 is provided with a second rod body 1901, the length of the second rod body 1901 is longer than that of the first rod body 201, the diameter of the second rod body 1901 is adapted to the aperture of the cavity 1701, the second rod body 1901 can be inserted into the cavity 1701, when the sample solid block is crushed, the first ejector 20 is taken out, the second ejector 19 is placed in the cavity 1701, then the second ejector 19 and the die 17 assembly is placed on the first pressure sensor 4, the die 17 faces to the bottom surface side of the top plate 6, the sample of the compressed solid block in the cavity 1701 is attached to the second pressure sensor 21 under the action of the lifting seat 3, and the sample of the compressed solid block in the cavity 1701 is crushed.

Preferably, in order to prevent air in the sample from affecting the test result during compression, the die holder body 1601 is provided with a first air hole 16011 with an orifice on the side wall thereof, the die holder embedded part 1602 is provided with a second air hole 16021 with an orifice on the top surface thereof, the first air hole 16011 is communicated with the second air hole 16021, when the die holder 16 and the die cylinder 17 are assembled together, the second air hole 16021 is communicated with the die cavity hole 1701, and during testing, a vacuum tube is inserted into the first air hole 16011, negative pressure vacuum is continuously applied, and the air in the sample is pumped out by the negative pressure vacuum through the second air hole 16021.

Preferably, for sealing, the outer wall of the die holder embedding part 1602 is sleeved with a sealing ring 1603.

Alternatively, the present application provides a preferred structure of the lifting device, specifically: the lifting device comprises a motor 10 arranged at the bottom of a support 1 and a gearbox 11 connected with the motor 10, a support plate 12 is arranged on the support 1 below a placing plate 2, a screw rod 13 is rotatably connected to the support plate 12, one end of the screw rod 13 is connected with an output shaft of the gearbox 11, the other end of the screw rod is in threaded connection with a lifting column 14, and the top surface of the lifting column 14 is connected with the top surface of a lifting seat 3. In this way, the motor 10 drives the gearbox 11 to rotate, the gearbox 11 drives the screw rod 13 to rotate, and under the action of the screw thread, the screw rod 13 drives the lifting column 14 to lift so as to enable the lifting seat 3 to lift.

Preferably, in order to make the lifting column 14 push the lifting seat 3 smooth, a buffer spring 15 is provided between the lifting column 14 and the lifting seat 3.

Optionally, the application further includes a control unit, the control unit is provided with a main stress preset unit and a graph drawing unit, the main stress preset unit is used for inputting main stress values, the main stress values can be one group or multiple groups, the control unit is respectively electrically connected with the first pressure sensor 4, the second pressure sensor 21 and the lifting device, the control unit obtains values of the first pressure sensor 4 and the second pressure sensor 21, when the value of the first pressure sensor 4 is consistent with the main pressure value input by the preset unit, a shutdown instruction is sent to the lifting device, and the value of the first pressure sensor 4 is sent to the graph drawing unit, or when the value of the second pressure sensor 21 is reduced, a shutdown instruction is sent to the lifting device, and the maximum value of the second pressure sensor 21 is sent to the graph drawing unit, and the graph drawing unit receives the values of the first pressure sensor 4 and the second pressure sensor 21 and draws a relationship curve of the values.

The foregoing has outlined and detailed description of the present application in terms of the general description and embodiments. It should be appreciated that numerous conventional modifications and further innovations may be made to these specific embodiments, based on the technical concepts of the present application; but such conventional modifications and further innovations may be made without departing from the technical spirit of the present application, and such conventional modifications and further innovations are also intended to fall within the scope of the claims of the present application.

Claims

1. The powder yield strength analyzer is characterized by comprising a bracket (1) and a die; a placing plate (2) is arranged at the top of the bracket (1); guide rods (22) are arranged on the left side and the right side of the top of the placement plate (2); the guide rod (22) is provided with a top plate (6); the bottom of the top plate (6) is provided with a second pressure sensor (21); the placing plate (2) is movably provided with a lifting seat (3); the top of the lifting seat (3) is provided with a first pressure sensor (4); the lifting device is used for driving the lifting seat (3) to ascend or descend; the die comprises a die holder (16), a die cylinder (17) and a first ejector rod (20); the die holder (16) comprises a die holder body (1601); the die holder body (1601) is provided with a die holder embedding part (1602); a die cavity hole (1701) is formed in one side of the die cylinder (17) and is used for placing a sample, and a die cylinder embedding hole (1702) communicated with the die cavity hole (1701) is formed in the other side of the die cylinder; the aperture and the depth of the die cylinder embedding hole (1702) are matched with the outer diameter and the length of the die holder embedding part (1602), and the die holder embedding part (1602) can be embedded into the die cylinder embedding hole (1702); the first ejector rod (20) is provided with a first rod body (201); the diameter of the first rod body (201) is matched with the aperture of the die cavity hole (1701), and the first rod body (201) can be inserted into the die cavity hole (1701) for extruding a sample placed in the die cavity hole (1701); the die holder (16), the die cylinder (17) and the first ejector rod (20) are combined, the first ejector rod (20) is attached to the bottom surface of the top plate (6), under the action of the lifting seat (3), the sample compression fixed block placed in the die cavity hole (1701) or the first ejector rod (20) and the die cylinder (17) are combined, the die cylinder (17) faces to one side of the bottom surface of the top plate (6), under the action of the lifting seat (3), the sample compression fixed block in the die cavity hole (1701) is attached to the second pressure sensor (21), and the sample compression fixed block in the die cavity hole (1701) is crushed.

2. A powder yield strength analyzer according to claim 1, further comprising a compact (18); the diameter of the pressing block (18) is matched with the aperture of the die cavity hole (1701), and the pressing block (18) can be placed in the die cavity hole (1701).

3. A powder yield strength analyzer according to claim 1, characterized in that the guide bar (22) below the top plate (6) is provided with a limiting plate (5); the limiting plate (5) is provided with a placing groove (501); an embedded groove (5011) is formed in the side wall of the placing groove (501); a convex mold cylinder embedding part (1703) which is matched with the embedding groove (5011) is arranged on the side wall of the mold cylinder (17); the mold cylinder insertion portion (1703) is insertable into the insertion groove (5011).

4. A powder yield strength analyzer according to claim 3, characterized in that the limiting plate (5) is slidably arranged on the guide rod (22); a spring (8) is sleeved on the guide rod (22) between the limiting plate (5) and the placing plate (2); the bottom of the limiting plate (5) is provided with a handle (9).

5. A powder yield strength analyzer according to claim 4, characterized in that the top plate (6) is screwed with an adjusting knob (7); the bottom surface of the adjusting button (7) is tangential to the top surface of the limiting plate (5), and the adjusting button (7) is rotated to adjust the distance between the top plate (6) and the limiting plate (5).

6. A powder yield strength analyzer according to claim 1, further comprising a second ram (19); the second ejector rod (19) is provided with a second rod body (1901); -the second stick (1901) length is longer than the first stick (201); -said second rod (1901) diameter is adapted to the bore diameter of said cavity bore (1701), the second rod (1901) being insertable into the cavity bore (1701); the second ejector rod (19) and the die cylinder (17) combination are placed on the first pressure sensor (4), the die cylinder (17) faces to one side of the bottom surface of the top plate (6), under the action of the lifting seat (3), the second pressure sensor (21) is attached to the sample of the compression fixed block in the die cavity hole (1701), and the sample of the compression fixed block in the die cavity hole (1701) is crushed.

7. The powder yield strength analyzer of claim 1, wherein the die holder body (1601) is provided with a first air hole (16011) with an orifice in a sidewall thereof; the die holder embedded part (1602) is provided with a second air hole (16021) with an orifice positioned on the top surface; the first air hole (16011) and the second air hole (16021) are communicated; when the die holder (16) and the die cylinder (17) are assembled together, the second air hole (16021) is communicated with the die cavity hole (1701).

8. The powder yield strength analyzer of claim 7, wherein the die holder insert (1602) is provided with a sealing ring (1603) on an outer wall thereof.

9. A powder yield strength analyzer according to any of claims 1-8, wherein the lifting device comprises a motor (10) arranged at the bottom of the bracket (1) and a gearbox (11) connected to the motor (10); a support plate (12) is arranged on the bracket (1) below the placing plate (2); the supporting plate (12) is connected with a screw rod (13) through threads; one end of the screw rod (13) is connected with an output shaft of the gearbox (11), and the other end of the screw rod is rotatably connected with a lifting column (14); the top surface of the lifting column (14) is connected with the top surface of the lifting seat (3).

10. A powder yield strength analyzer as claimed in claim 9, further comprising a control unit; the control unit is provided with a main stress preset unit and a graph drawing unit; the main stress preset unit is used for inputting a main stress value; the control unit is respectively and electrically connected with the first pressure sensor (4), the second pressure sensor (21) and the lifting device; the control unit acquires the values of the first pressure sensor (4) and the second pressure sensor (21), and when the value of the first pressure sensor (4) is consistent with the main pressure value input by the preset unit, the control unit sends a shutdown instruction to the lifting device and sends the value of the first pressure sensor (4) to the graph drawing unit, or when the value of the second pressure sensor (21) is reduced, the control unit sends the shutdown instruction to the lifting device and sends the maximum value of the second pressure sensor (21) to the graph drawing unit; the graphic plotting unit receives the values of the first pressure sensor (4) and the second pressure sensor (21) and plots the relationship curves thereof.