CN211545786U - Safety type demoulding device capable of automatically lifting - Google Patents

Abstract

The utility model provides a safety type demoulding device capable of automatically lifting, a shell is fixed on a base, a hydraulic transmission device comprising an oil cylinder, a first piston, a second piston, a piston rod, an oil drain valve, a first oil pipe, a second oil pipe, a third oil pipe, a first oil storage cavity, a second oil storage cavity, an oil discharge one-way valve and an oil absorption one-way valve is arranged in the shell, a tray is arranged at the upper end of the piston rod, a speed regulating switch is arranged on a motor, a motor fan blade is arranged on a rotating shaft of the motor, the blade of the motor fan blade is attached to the surface of the second piston, the lower end of a tightening rod is attached to the tray, and the upper end of the tightening rod is fixed with a tightening; two sides of the shell are respectively provided with a bracket, and two clamps on the brackets are matched for clamping the sleeve; the upper ends of the two supports are fixed with demoulding rings in the horizontal direction, the round holes are positioned right above a sample to be demoulded, the area formed by the cross section of the jacking piece is positioned right below the sample to be demoulded, and the upper end of the jacking end head is jacked at the lower end of the sample to be demoulded.

Description

Safety type demoulding device capable of automatically lifting

Technical Field

The utility model relates to a material test instrument field specifically is a but safe type knockout of automatic rising.

Background

The ejector is generally mainly composed of a hydraulic jack and can be used in the field of geotechnical materials and inorganic binders, and a sample is compacted and formed in a sleeve and then taken out of the sleeve by utilizing the upward thrust of the jack.

The existing stripper has the following two problems in use, firstly, when a formed sample is stripped from a sleeve, the sleeve is easy to swing left and right and even fall off, so the safety of the sleeve is low; secondly, need manual depression bar when operation jack, it is slow at first to rise in addition, and speed is very fast when closing on the drawing of patterns, and speed can not be controlled at will, has consequently just so increased staff's physical power, and not only influence work efficiency but also can make the security of sleeve drawing of patterns not high.

SUMMERY OF THE UTILITY MODEL

To the problem that exists among the prior art, the utility model provides a but safe type knockout of automatic rising, easy operation, swift, degree of automation are high, have improved the security of sleeve security and sleeve drawing of patterns.

The utility model discloses a realize through following technical scheme:

a safety type stripper capable of automatically lifting comprises a limiting ring, a clamp, a connecting rod, a bracket, a tray, a motor fan blade, a shell, a base, a stripping ring and a hydraulic transmission device;

the shell is fixed on the base, a hydraulic transmission device is arranged in the shell and comprises an oil cylinder, a first piston, a second piston, a piston rod, an oil drain valve, a first oil pipe, a second oil pipe, a third oil pipe, a first oil storage cavity, a second oil storage cavity, an oil discharge one-way valve and an oil suction one-way valve; an oil cylinder is arranged on the base, the oil cylinder is provided with a first oil pipe and a second oil pipe, the first oil pipe is bent to form an L shape, the second oil pipe is perpendicular to the upper surface of the oil cylinder, the tail end of the horizontal section of the first oil pipe is communicated with the second oil pipe, an oil discharge valve is arranged above the communication position of the first oil pipe and the second oil pipe, an oil absorption one-way valve is arranged in the first oil pipe, the upper end of the second oil pipe is connected with an oil outlet of a first oil storage cavity, the upper end of the vertical section of the first oil pipe is connected with an oil inlet of a second oil storage cavity, an oil inlet of the first oil storage cavity and an oil outlet of the second oil storage cavity are connected with a third oil pipe, an oil discharge one-way valve is arranged in the third oil pipe, a first piston is arranged in the first oil storage cavity, a piston rod is fixed at the upper end of the first piston, a second piston is arranged in the second oil storage cavity, the upper;

the upper end of the piston rod is provided with a tray, the motor is arranged on the base, the motor is provided with a speed regulating switch, a rotating shaft of the motor is provided with a motor fan blade, the blade of the motor fan blade is attached to the upper surface of the second piston, and the blade of the motor fan blade can rotate on the second piston after the motor rotates;

the shell is provided with an opening above the tray, the upper surface of the tray is provided with a jacking piece, the jacking piece comprises a jacking rod and a jacking end, the lower end of the jacking rod is downwards attached to the tray through the opening of the shell, a gap is reserved between the outer wall of the jacking rod and the opening of the shell, the upper end of the jacking rod is fixedly arranged with the jacking end, and the length direction of the jacking end is parallel to the length direction of the jacking rod; the two sides of the shell are respectively provided with a support, the supports are fixed on the base along the vertical direction, the supports are sleeved with a limiting ring, the limiting ring is fixed with a connecting rod along one side of the horizontal plane of the limiting ring, a clamp is fixed on the connecting rod, and the two clamps are matched to clamp a sleeve filled with a sample to be demoulded;

the upper end horizontal direction of two supports is fixed with the drawing of patterns ring, and the drawing of patterns ring is equipped with the round hole the same with waiting to demould the sample external diameter, and this round hole is located and waits to demould the sample directly over, and the region that the tight piece cross section of top formed all is waiting to demould under the sample, and the upper end top of the tight end in top is tightly waiting to demould the lower extreme of sample.

Preferably, still include the registration arm, the structure of registration arm includes cylinder section and the circular cone section of coaxial setting from bottom to top in proper order, and the last bottom surface radius of cylinder section is the same with the lower bottom surface radius of circular cone section, and the internal diameter of circular cone section is the same with the external diameter of tightening rod, and the cylinder section is pegged graft at the opening part of casing, and tightening rod runs through in the registration arm.

Preferably, the speed regulating switch is divided into five gears.

Preferably, the motor is arranged in the shell, and the speed regulation switch is arranged on the outer side of the shell.

Preferably, the demolding ring comprises a first metal ring, a second metal ring and a third metal ring, wherein the outer diameter of the second metal ring is equal to the inner diameter of the first metal ring, and the outer diameter of the third metal ring is equal to the inner diameter of the second metal ring;

the first metal ring is symmetrically provided with first grooves from inside to outside along the diameter direction of the inner circle of the first metal ring, and the second metal ring is symmetrically provided with first convex grooves which are matched with the first grooves in an inserting manner along the diameter direction of the outer circle of the second metal ring; the second metal ring is symmetrically provided with second grooves from inside to outside along the diameter direction of the inner circle of the second metal ring, and the third metal ring is symmetrically provided with second convex grooves which are in splicing fit with the second grooves from outside along the diameter direction of the outer circle of the third metal ring; the first convex groove of the second metal ring is in inserting fit with the first groove of the first metal ring, and the second convex groove of the third metal ring is in inserting fit with the second groove of the second metal ring.

Preferably, the jacking end is a semi-ellipsoid, the semi-ellipsoid and the jacking rod are coaxially arranged, and the end part of the long axis of the semi-ellipsoid is jacked at the center of the lower end of the sample to be demoulded.

Preferably, a butterfly screw is installed on the outer side of the limiting ring.

Preferably, the clamp is made of memory metal.

Preferably, the shape of the clamp is a circular arc.

Compared with the prior art, the utility model discloses following profitable technological effect has:

the utility model discloses a safety type demoulding device capable of automatically lifting, which utilizes the basic principle of hydraulic transmission, drives a motor fan blade through a motor to enable a second piston to move up and down, and then enables a tray to move upwards through hydraulic transmission by a piston rod; the lower end of the puller rod is downwards attached to the tray through the opening of the shell, a gap is reserved between the outer wall and the opening of the shell, the upper end of the puller rod is fixed with the puller end, the length direction of the puller end is parallel to the length direction of the puller rod, so that the puller rod can stably push the puller end to move upwards, in addition, a sleeve which is provided with a sample to be demoulded can be clamped through the design of a limiting ring and a clamp, a demoulding ring is fixed at the upper ends of two supports, the demoulding ring is provided with a round hole with the same outer diameter as the sample to be demoulded, the round hole is positioned right above the sample to be demoulded, so that after the sleeve of the sample to be demoulded is tightly attached right below the demoulding ring, areas formed by the cross section of the puller are all right below the sample to be demoulded, the pusher end pushes the lower end of the puller rod to the lower end of the sample to be demoulded tightly, and the speed regulating switch is operated to control the demoulding speed. The support of current knockout dress at the both sides stand needs manual the transferring to can support telescopic position to guarantee that empty sleeve is unlikely to freely drop and impaired injury after the test piece drawing of patterns, nevertheless because the drawing of patterns lead screw rises, descends and does not have automatic stop device, consequently must closely notice the extreme position size that the lead screw rises and descend when the operation, otherwise the sleeve will receive the damage, the utility model discloses a but safe type knockout automatic lift, speed governing, installation spacing ring and anchor clamps, the security is high, accurate drawing of patterns.

Further, current knockout only is applicable to the drawing of patterns of a certain sleeve scale, the utility model discloses a cooperation of pegging graft of the first tongue of second metal ring and the first recess of first metal ring, cooperation of pegging graft of the second tongue of third metal ring and the second recess of second metal ring have realized three-order stripper ring, can use to 3 kinds of different sleeves commonly used, and an organic whole is multi-purpose, simple operation, labour saving and time saving.

Furthermore, the jacking end is a semi-ellipsoid, the semi-ellipsoid and the jacking rod are coaxially arranged, the end part of the long axis of the semi-ellipsoid is jacked at the center of the lower end of the sample to be demoulded, so that the center of the sleeve, the center of the jack and the center of the demoulding ring are aligned, the sleeve cannot be damaged, and demoulding is facilitated.

Drawings

Fig. 1 is a schematic structural view of the ejector of the present invention.

Fig. 2 is a top view of the multi-stage stripper ring of fig. 1.

Fig. 3 is a schematic structural diagram of the hydraulic system in fig. 1.

Fig. 4 is a schematic diagram of a speed-regulating switch circuit of the motor in fig. 1.

In the figure: the oil-gas separation device comprises a sleeve 1, a limiting ring 2, a clamp 2-1, a connecting rod 2-2, a support 3, a first metal ring 41, a second metal ring 42, a third metal ring 43, a bolt 5, a tightening rod 6, a cylindrical section 61, a conical section 62, a tray 7, a tightening end 8, a motor 9, a motor fan blade 10, an oil cylinder 11, a first piston 12, a piston rod 13, an oil drain valve 14, a speed regulating switch 15, a shell 16, a base 17, a butterfly screw 18, a first oil pipe 19, a second oil pipe 20, a third oil pipe 21, a first oil storage cavity 22, a second oil storage cavity 23, an oil drain check valve 24, an oil suction check valve 25 and a second piston 26.

Detailed Description

The present invention will now be described in further detail with reference to the accompanying drawings, which are provided for purposes of illustration and not limitation.

Referring to fig. 1 and 3, the safety multifunctional demoulding device capable of automatically lifting comprises a limiting ring 2, a clamp 2-1, a connecting rod 2-2, a bracket 3, a demoulding ring, a tray 7, a motor 9, a motor fan blade 10, a shell 16, a base 17 and a hydraulic transmission device;

the shell 16 is fixed on the base 17, a hydraulic transmission device is arranged in the shell 16, and the hydraulic transmission device comprises an oil cylinder 11, a first piston 12, a second piston 26, a piston rod 13, an oil drain valve 14, a first oil pipe 19, a second oil pipe 20, a third oil pipe 21, a first oil storage cavity 22, a second oil storage cavity 23, an oil discharge one-way valve 24 and an oil suction one-way valve 25; an oil cylinder 11 is arranged on a base 17, the oil cylinder 11 is provided with a first oil pipe 19 and a second oil pipe 20, the first oil pipe 19 is bent to form an L shape, the second oil pipe 20 is arranged perpendicular to the upper surface of the oil cylinder 11, the tail end of the horizontal section of the first oil pipe 19 is communicated with the second oil pipe 20, an oil discharge valve 14 is arranged above the communication position of the first oil pipe 19 and the second oil pipe 20, an oil suction one-way valve 25 is arranged in the first oil pipe 19, the upper end of the second oil pipe 20 is connected with an oil outlet of a first oil storage chamber 22, the upper end of the vertical section of the first oil pipe 19 is connected with an oil inlet of a second oil storage chamber 23, an oil inlet of the first oil storage chamber 22 and an oil outlet of the second oil storage chamber 23 are connected with a third oil pipe 21, an oil discharge one-way valve 24 is arranged in the third oil pipe 21, a first piston 12 is arranged in the first oil storage chamber 22, a piston rod 13 is fixed at, the upper surface of the second piston 26 is a horizontal plane, and the cross section of the second piston 26 is the same as the shape of the opening at the upper end of the second oil storage chamber 23;

the upper end of the piston rod 13 is provided with the tray 7, the motor 9 is arranged on the base 17, the motor 9 is provided with the speed regulating switch 15, the rotating shaft of the motor 9 is provided with the motor fan blade 10, the blade of the motor fan blade 10 is attached to the upper surface of the second piston 26, and the blade of the motor fan blade 10 can rotate on the second piston 26 after the motor 9 rotates;

an opening is formed in the shell 16 and located above the tray 7, a jacking piece is arranged on the upper surface of the tray 7 and comprises a jacking rod 6 and a jacking end 8, the lower end of the jacking rod 6 is downwards attached to the tray 7 through the opening of the shell 16, a gap is reserved between the outer wall of the jacking rod 6 and the opening of the shell 16, the upper end of the jacking rod 6 is fixedly arranged with the jacking end 8, and the length direction of the jacking end 8 is parallel to the length direction of the jacking rod 6; two sides of the shell 16 are respectively provided with a support 3, the supports 3 are fixed on a base 17 along the vertical direction, a limiting ring 2 is sleeved on each support 3, a connecting rod 2-2 is fixed on each limiting ring 2 along one side of the horizontal plane of each limiting ring, a clamp 2-1 is fixed on each connecting rod 2-2, and the two clamps 2-1 are matched for clamping a sleeve 1 filled with a sample to be demoulded;

the upper end horizontal direction of two supports 3 is fixed with the drawing of patterns ring, and the drawing of patterns ring is equipped with the round hole the same with waiting to demould the sample external diameter, and this round hole is located and waits to demould the sample directly over, and the region that the tight end cross section of top formed all is waiting to demould under the sample, and the upper end top of the tight end 8 of top is tightly treating the lower extreme of demoulding the sample.

Specifically, the solid cylindrical straight rod support 3 is welded on the base 17, and the base 17 is an iron plate with the thickness of 20mm and the rectangular section. The motor 9 and the oil cylinder 11 are both fixedly arranged on the base 17. The motor 9 is provided with a speed regulating switch 15, a circuit of five gears is shown in fig. 4, the motor fan blade 10 is a Y80 motor fan blade, a through hole is arranged at the center of the Y80 motor fan blade, the through hole is connected with a rotating shaft of the motor 9, and the rotation of the rotating shaft of the motor 9 drives the Y80 motor fan blade to rotate. The box-shaped shell 16 is a cuboid iron shell and is used for covering the motor 9 and the oil cylinder 11, the position of the speed regulating switch 15 is also arranged on the front side surface of the box-shaped shell 16, and the speed regulating switch 15 regulates the rotating speed of a fan blade of the Y80 motor, wherein the rotating speed is determined by the power of the motor 9.

In addition, still include the registration arm, the structure of registration arm includes cylinder section 61 and the circular cone section 62 of coaxial setting in proper order from bottom to top, and the last bottom surface radius of cylinder section 61 is the same with the lower bottom surface radius of circular cone section 62, and the internal diameter of circular cone section 62 is the same with the external diameter of tightening rod 6, and cylinder section 61 pegs graft in the opening part of casing 16, and tightening rod 6 runs through in the registration arm. The jacking end 8 is a semi-ellipsoid, the semi-ellipsoid and the jacking rod 6 are coaxially arranged, and the end part of the long axis of the semi-ellipsoid is jacked at the center of the lower end of the sample to be demoulded.

The butterfly screws 18 are mounted on the outer sides of the limiting rings 2, so when the butterfly screws 18 are loosened, the two clamps 2-1 can move up and down along the support 3, when the butterfly screws 18 are tightened, the clamps 2-1 are fixed on the support 3, the clamps 2-1 are made of memory metal, the sleeves 1 with different sizes can be firmly clamped, and the problem that the sleeves are prone to left and right shaking during demolding is solved. The upper end of the bracket 3 is fixed with a demoulding ring by a bolt 5, as shown in fig. 2, the demoulding ring comprises a first metal ring 41, a second metal ring 42 and a third metal ring 43, the outer diameter of the second metal ring 42 is equal to the inner diameter of the first metal ring 41, and the outer diameter of the third metal ring 43 is equal to the inner diameter of the second metal ring 42;

the first metal ring 41 is symmetrically provided with first grooves from inside to outside along the diameter direction of the inner circle thereof, and the second metal ring 42 is symmetrically provided with first convex grooves which are matched with the first grooves in an inserting manner along the diameter direction of the outer circle thereof; the second metal ring 42 is symmetrically provided with second grooves from inside to outside along the diameter direction of the inner circle thereof, and the third metal ring 43 is symmetrically provided with second convex grooves which are in splicing fit with the second grooves from outside along the diameter direction of the outer circle thereof; the first convex groove of the second metal ring 42 is matched with the first concave groove of the first metal ring 41 in an inserting manner, and the second convex groove of the third metal ring 43 is matched with the second concave groove of the second metal ring 42 in an inserting manner. The first metal ring 41, the second metal ring 42 and the third metal ring 43 are respectively suitable for sleeves of R50mm, R100mm and R150mm, the size of different demolding rings can be controlled, and one-time demolding of sleeves of different specifications can be achieved in a targeted mode.

Referring to fig. 3, the lifting device is automatic and has adjustable rotating speed, the internal structure utilizes the hydraulic transmission principle of the existing hydraulic jack, the oil drain valve 14 is closed, the motor 9 drives the fan blade of the Y80 motor to rotate, the lower second piston 26 moves up and down, the lifting of the piston rod 13 is indirectly influenced, and the upper tray 7 is driven to move. The fan blade of the Y80 motor can be divided into five gears according to the power of the motor 9 by manually adjusting the power of the motor 9, so that the rising speed is processed according to the actual condition, the demoulding quality of a test piece is improved, and the physical strength is greatly saved. When the rotation of the fan blade of the Y80 motor is stopped, the oil drain valve 14 is opened, so that the oil in the second oil pipe 20 and the third oil pipe 21 flows back to the cylinder 11 due to the balance according to the principle of the communicating vessel, and the first piston 12 is indirectly lowered, and the first piston 12 is not raised although the second piston 26 is operated up and down. The device can be regarded as a secondary protection measure, and after the instrument is used, the device is closed, and the demoulding cannot be influenced when the motor 9 is in an open state.

The utility model discloses a use as follows: in the demolding experiment of the inorganic binder test piece, aggregate or soil material is filled into a sleeve mold and flattened, and the sample is compacted and prepared by a pressure tester. Firstly, selecting the number of rings of a multistage demoulding ring with required size according to the diameter of a sleeve 1, placing the sleeve 1 provided with a test piece under the multistage demoulding ring in a clinging manner, adjusting the position of a clamp 2-1, firmly stabilizing the sleeve 1 by using the clamp 2-1, then controlling a speed regulating switch 15, and adjusting the rising speed of a jacking end head 8 by turning to different gear numbers of the speed regulating switch 15 according to the requirement of actual conditions.

The change of the power of the motor 9 causes the change of the rotating speed of the fan blade of the Y80 motor, the lower second piston 26 moves up and down to indirectly affect the lifting of the piston rod 13 and then affect the movement of the tray 7, and the jacking end 8 continuously rises to jack the sample to be upward demolded. When the sample is demoulded soon, the rotating speed can be slowed down, the speed regulation division is more careful, and the inaccuracy of manual control of the speed by a hydraulic rod of a traditional jack is overcome. When the test piece is completely separated from the sleeve 1, the oil drain valve 14 is opened, the fan blade of the Y80 motor rotates again at the moment, the movement of oil cannot be influenced, the jacking end head 8 cannot rise, the safety of the instrument can be improved, and the state can be regarded as a protection device. After the test is finished, the test sample is taken down, the oil drain valve 14 is opened, the speed regulating switch 15 is closed, and the rotation of a fan blade of the Y80 motor can be stopped, so that oil below the piston rod 13 can move downwards due to balance according to the principle of a communicating vessel, the piston rod 13 descends, the jacking end 8 slowly descends, finally the clamp 2-1 is broken off, and the sleeve 1 is taken out.

Claims (9)

1. The safety type stripper capable of automatically lifting is characterized by comprising a limiting ring (2), a clamp (2-1), a connecting rod (2-2), a support (3), a tray (7), a motor (9), a motor fan blade (10), a shell (16), a base (17), a stripping ring and a hydraulic transmission device;

the oil-saving device is characterized in that the shell (16) is fixed on the base (17), a hydraulic transmission device is arranged in the shell (16), and the hydraulic transmission device comprises an oil cylinder (11), a first piston (12), a second piston (26), a piston rod (13), an oil drain valve (14), a first oil pipe (19), a second oil pipe (20), a third oil pipe (21), a first oil storage cavity (22), a second oil storage cavity (23), an oil discharge one-way valve (24) and an oil suction one-way valve (25); an oil cylinder (11) is arranged on the base (17), the oil cylinder (11) is provided with a first oil pipe (19) and a second oil pipe (20), the first oil pipe (19) is bent to form an L shape, the second oil pipe (20) is perpendicular to the upper surface of the oil cylinder (11), the tail end of the horizontal section of the first oil pipe (19) is communicated with the second oil pipe (20), an oil discharge valve (14) is arranged above the communication position of the first oil pipe (19) and the second oil pipe (20), an oil suction one-way valve (25) is arranged in the first oil pipe (19), the upper end of the second oil pipe (20) is connected with an oil outlet of a first oil storage cavity (22), the upper end of the vertical section of the first oil pipe (19) is connected with an oil inlet of a second oil storage cavity (23), the oil inlet of the first oil storage cavity (22) and the oil outlet of the second oil storage cavity (23) are connected with a third oil pipe (21), and an oil discharge one-way valve (24, a first piston (12) is arranged in the first oil storage cavity (22), a piston rod (13) is fixed at the upper end of the first piston (12), a second piston (26) is arranged in the second oil storage cavity (23), the upper surface of the second piston (26) is a horizontal plane, and the cross section of the second piston (26) is the same as the shape of an opening at the upper end of the second oil storage cavity (23);

the upper end of the piston rod (13) is provided with a tray (7), the motor (9) is arranged on the base (17), the motor (9) is provided with a speed regulating switch (15), a rotating shaft of the motor (9) is provided with a motor fan blade (10), the blade of the motor fan blade (10) is attached to the upper surface of the second piston (26), and the blade of the motor fan blade (10) can rotate on the second piston (26) after the motor (9) rotates;

an opening is formed in the position, above the tray (7), of the shell (16), a jacking piece is arranged on the upper surface of the tray (7), the jacking piece comprises a jacking rod (6) and a jacking end (8), the lower end of the jacking rod (6) is downward attached to the tray (7) through the opening of the shell (16), a gap is reserved between the outer wall of the jacking rod (6) and the opening of the shell (16), the upper end of the jacking rod (6) is fixedly arranged with the jacking end (8), and the length direction of the jacking end (8) is parallel to the length direction of the jacking rod (6); two sides of the shell (16) are respectively provided with a support (3), the supports (3) are fixed on a base (17) along the vertical direction, a limiting ring (2) is sleeved on each support (3), a connecting rod (2-2) is fixed on each limiting ring (2) along one side of the horizontal plane of each limiting ring, a clamp (2-1) is fixed on each connecting rod (2-2), and the two clamps (2-1) are matched for clamping a sleeve (1) filled with a sample to be demoulded;

the upper end horizontal direction of two supports (3) is fixed with the drawing of patterns ring, and the drawing of patterns ring is equipped with the round hole the same with waiting to demould the sample external diameter, and this round hole is located and waits to demould the sample directly over, and the region that the tight end cross section of top formed all is waiting to demould under the sample, and the upper end top of the tight end in top (8) is tightly waiting to demould the lower extreme of sample.

2. The safety type demolding device capable of automatically ascending and descending as claimed in claim 1, further comprising a positioning tube, wherein the positioning tube sequentially comprises a cylindrical section (61) and a conical section (62) which are coaxially arranged from bottom to top, the radius of the upper bottom surface of the cylindrical section (61) is the same as the radius of the lower bottom surface of the conical section (62), the inner diameter of the conical section (62) is the same as the outer diameter of the tightening rod (6), the cylindrical section (61) is inserted into the opening of the shell (16), and the tightening rod (6) penetrates through the positioning tube.

3. The safety type ejector capable of automatically lifting and lowering as claimed in claim 1, wherein the speed regulating switch (15) is divided into five gears.

4. The safety type ejector capable of automatically lifting and lowering as claimed in claim 1, wherein the motor (9) is arranged in the housing (16), and the speed regulating switch (15) is arranged outside the housing (16).

5. The safety type mold release device capable of automatically lifting and lowering as claimed in claim 1, wherein the mold release ring comprises a first metal ring (41), a second metal ring (42) and a third metal ring (43), the outer diameter of the second metal ring (42) is equal to the inner diameter of the first metal ring (41), and the outer diameter of the third metal ring (43) is equal to the inner diameter of the second metal ring (42);

the first metal ring (41) is symmetrically provided with first grooves from inside to outside along the diameter direction of the inner circle of the first metal ring, and the second metal ring (42) is symmetrically provided with first convex grooves which are matched with the first grooves in an inserting manner along the diameter direction of the outer circle of the second metal ring; the second metal ring (42) is symmetrically provided with second grooves from inside to outside along the diameter direction of the inner circle of the second metal ring, and the third metal ring (43) is symmetrically provided with second convex grooves which are matched with the second grooves in an inserting manner along the diameter direction of the outer circle of the third metal ring; the first convex groove of the second metal ring (42) is in inserting fit with the first groove of the first metal ring (41), and the second convex groove of the third metal ring (43) is in inserting fit with the second groove of the second metal ring (42).

6. The safety type stripper capable of automatically lifting and lowering as claimed in claim 1, wherein the tightening end (8) is a semi-ellipsoid, the semi-ellipsoid and the tightening rod (6) are coaxially arranged, and the end of the long axis of the semi-ellipsoid is tightly pressed at the center of the lower end of the sample to be stripped.

7. The safety type demolding device capable of automatically ascending and descending as claimed in claim 1, wherein a thumb screw (18) is mounted on the outer side of the limiting ring (2).

8. The safety type automatic lifting ejector according to claim 1, wherein the clamp (2-1) is made of memory metal.

9. The safety automatic lifting ejector according to claim 1, wherein the shape of the clamp (2-1) is a circular arc.

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