CN212870989U

CN212870989U - Measuring cylinder structure

Info

Publication number: CN212870989U
Application number: CN202021879225.6U
Authority: CN
Inventors: 李建哲
Original assignee: Individual
Current assignee: Individual
Priority date: 2020-09-01
Filing date: 2020-09-01
Publication date: 2021-04-02
Anticipated expiration: 2030-09-01

Abstract

The utility model relates to the technical field of accessory devices for element measurement, in particular to a measuring cylinder structure, which can conveniently fix elements during the measurement and improve the practicability; the element and the scale are convenient to compare, so that the use is convenient; the device comprises a cylinder body and a placing block, wherein a working cavity is arranged in the cylinder body, a taking and placing opening is communicated with the front side of the cylinder body, and scales are arranged on the inner rear side wall of the cylinder body; the positioning device comprises a positioning block, a first ball bearing, a first positioning piece, two groups of fixing columns, two groups of screw rods and two groups of fixing plates, wherein the outer ends of the two groups of screw rods are provided with limiting columns; the rear side wall in the cylinder body is longitudinally provided with a sliding groove, and a sliding rod is fixed at the sliding groove in a sliding manner.

Description

Measuring cylinder structure

Technical Field

The utility model relates to a technical field of accessory device is measured to the component, especially relates to a measure a section of thick bamboo structure.

Background

As is well known, the measuring cylinder structure is an auxiliary device used for assisting manual measurement of elements in the process of production and processing, so that the elements can be better assembled in the following process, and the measuring cylinder structure is widely used in the field of element measurement; the existing measuring cylinder structure comprises a cylinder body and a placing block, wherein a working cavity is arranged in the cylinder body, a taking and placing opening is communicated with the front side of the cylinder body, scales are arranged on the inner rear side wall of the cylinder body, and the placing block is arranged on the inner bottom side wall of the cylinder body; when the existing measuring cylinder structure is used, an element is placed on the placing block, and the element is compared with the scale for measurement; the existing measuring cylinder structure is found in use that when elements of the measuring cylinder structure are measured, the elements cannot be conveniently fixed, so that the practicability of the measuring cylinder structure is poor; and the element is inconvenient to compare with the scale, thereby causing the use to be inconvenient.

SUMMERY OF THE UTILITY MODEL

In order to solve the technical problems, the utility model provides a device which can be conveniently fixed during the measurement of elements, thereby improving the practicability; and the element is compared with the scale more conveniently, thereby the measuring cylinder structure which is more convenient to use is realized.

The utility model discloses a measuring cylinder structure, which comprises a cylinder body and a placing block, wherein a working cavity is arranged inside the cylinder body, the front side of the cylinder body is communicated with a taking and placing opening, and the inner rear side wall of the cylinder body is provided with scales; the device also comprises two groups of fixed columns, two groups of screw rods and two groups of fixed plates, wherein the inner ends of the two groups of screw rods are respectively screwed through the outer side walls of the two groups of fixed columns and respectively screwed out of the inner sides of the two groups of fixed columns to be connected with the two groups of fixed plates, the outer ends of the two groups of screw rods are respectively provided with a limiting column, the device also comprises two groups of first threaded pipes and two groups of first threaded rods, the left side and the right side of the top, first ball bearings and first limiting pieces are arranged in the two groups of first placing grooves, first blocking pieces are arranged at the top ends of the two groups of first placing grooves, the bottom ends of the two groups of first threaded pipes penetrate through the two groups of blocking pieces respectively and are inserted into the two groups of first ball bearings and are connected with the two groups of first limiting pieces respectively, the bottom ends of the two groups of first threaded rods are inserted into the top ends of the two groups of first threaded pipes respectively and are screwed into the two groups of first threaded pipes, and the top ends of the two groups of first threaded rods are connected with the bottom ends of the two groups of fixing columns; the rear side wall in the cylinder body is longitudinally provided with a sliding groove, and a sliding rod is fixed at the sliding groove in a sliding manner.

The utility model discloses a measuring cylinder structure still includes motor, transmission shaft, first gear and two sets of second gears, and the motor is installed at placing a top middle part, and two sets of second gears are fixed suit respectively in the two sets of first screwed pipe outsides, and the transmission shaft bottom is connected with motor top output, and the transmission shaft top is connected with first gear bottom, and two sets of second gears all with first gear engagement.

The utility model discloses a measuring cylinder structure still includes two sets of bradyseism boards, two sets of bradyseism springs and two sets of bradyseism pieces, and two sets of bradyseism board bottom are connected with placing piece top left side and right side respectively, and two sets of bradyseism spring one end are connected with two sets of bradyseism inboard respectively, and two sets of bradyseism spring other ends are connected with two sets of bradyseism pieces respectively, and the motor clamps between two sets of bradyseism pieces.

The utility model discloses a measuring cylinder structure still includes two sets of pivots and two sets of rotor plates, and two sets of fixed plate inboards all are provided with the second standing groove to be provided with the spacing piece of second ball bearing and second in two sets of second standing groove insides, two sets of second standing groove inboards all are provided with the second separation blade, and two sets of pivot outer ends are passed two sets of second separation blades respectively and are inserted respectively to two sets of second ball bearing inside respectively with two sets of spacing pieces of second be connected, two sets of pivot the inner respectively with two sets of rotor plates be connected.

The utility model discloses a measuring cylinder structure still includes two sets of locking plates, two sets of cover spring group and two sets of scalable nest of tubes, and two sets of cover spring group one end is connected with two sets of rotor plates inboards respectively, and two sets of cover spring group other ends are connected with two sets of locking plates respectively, and two sets of scalable nest of tubes one end are connected with two sets of rotor plates inboards respectively, and two sets of scalable nest of tubes other ends are connected with two sets of locking plates respectively, and two sets of cover spring group difference suit is in two sets of scalable nest of tubes outsides.

The utility model discloses a measuring cylinder structure still includes support frame and four supporting legs of group, and the top of four supporting legs of group is installed respectively in support frame bottom left front side, right front side, left rear side and right rear side, and the bottom of four supporting legs of group is all installed and is being placed a top, and first gear is located the support frame below.

The utility model discloses a measure a section of thick bamboo structure, the piece slidable is placed and is fixed in slide department to being provided with the slide around the barrel inner bottom lateral wall.

The utility model discloses a measuring cylinder structure still includes four group's second threaded rods, four group's second screwed pipes and four group's weights, and the top of four group's second threaded rods is installed respectively at barrel bottom left front side, right front side, left rear side and right rear side, and inside four group's second threaded rods bottom spiral shell dress to four group's second screwed pipe tops respectively, four group's weights were installed respectively in four group's second screwed pipe bottoms.

Compared with the prior art, the beneficial effects of the utility model are that: the device can drive two groups of fixed plates to move transversely by manually rotating two groups of screw rods, so that an element is clamped between the two groups of fixed plates and can be conveniently fixed, the practicability of the device is improved, the screw rods are limited by two groups of limiting columns and are not easy to screw down and fall off, meanwhile, two groups of fixed columns on two groups of first threaded rods can be driven by manually rotating two groups of first threaded pipes to move longitudinally, the clamping heights of the two groups of fixed plates can be adjusted according to the size of the element, the adaptability of the device is improved, the first limiting piece limits the first threaded pipes to prevent the first threaded pipes from being leaped out of a first placing groove, the first limiting piece is rigidly connected with the first threaded pipes, when the first threaded pipes rotate, the first limiting piece rotates along with the first threaded pipes, and a first ball bearing is clamped between a first blocking piece and the first limiting piece, so that the first placing groove cannot be leaped out, the first limiting sheet and the first placing groove can be mechanically locked, so that the first limiting sheet can be further fixed conveniently; the sliding rod can be slid to be in contact with the element, and the sliding rod and the scales are compared, so that the comparison is convenient, and the use is convenient.

Drawings

Fig. 1 is a schematic structural diagram of the present invention;

FIG. 2 is an enlarged partial view of portion A of FIG. 1;

FIG. 3 is an enlarged view of a portion B of FIG. 1;

in the drawings, the reference numbers: 1. a barrel; 2. placing the blocks; 3. calibration; 4. fixing a column; 5. a lead screw; 6. a fixing plate; 7. a limiting column; 8. a first threaded pipe; 9. a first threaded rod; 10. a first baffle plate; 11. a chute; 12. a slide bar; 13. a motor; 14. a drive shaft; 15. a first gear; 16. a second gear; 17. a cushioning plate; 18. a shock absorption block; 19. a rotating shaft; 20. a rotating plate; 21. a second baffle plate; 22. a locking plate; 23. a spring set; 24. a telescopic tube set; 25. a support frame; 26. supporting legs; 27. a second threaded rod; 28. a second threaded pipe; 29. and (5) weighting the weight.

Detailed Description

The following detailed description of the embodiments of the present invention is provided with reference to the accompanying drawings and examples. The following examples are intended to illustrate the invention, but are not intended to limit the scope of the invention.

As shown in fig. 1 to 3, the measuring cylinder structure of the present invention comprises a cylinder body 1 and a placing block 2, wherein a working chamber is arranged inside the cylinder body 1, a taking and placing opening is arranged on the front side of the cylinder body 1 in a communicating manner, and a scale 3 is arranged on the inner rear side wall of the cylinder body 1; the device also comprises two groups of fixed columns 4, two groups of screw rods 5 and two groups of fixed plates 6, wherein the inner ends of the two groups of screw rods 5 are respectively screwed through the outer side walls of the two groups of fixed columns 4 and respectively screwed out of the inner sides of the two groups of fixed columns 4 to be connected with the two groups of fixed plates 6, the outer ends of the two groups of screw rods 5 are respectively provided with a limiting column 7, the device also comprises two groups of first threaded pipes 8 and two groups of first threaded rods 9, the left side and the right side of the top end, first ball bearings and first limiting pieces are arranged in the two groups of first placing grooves, first blocking pieces 10 are arranged at the top ends of the two groups of first placing grooves, the bottom ends of the two groups of first threaded pipes 8 penetrate through the two groups of blocking pieces respectively and are inserted into the two groups of first ball bearings and are connected with the two groups of first limiting pieces respectively, the bottom ends of the two groups of first threaded rods 9 are inserted into the top ends of the two groups of first threaded pipes 8 respectively and are screwed into the two groups of first threaded pipes, and the top ends of the two groups of first threaded rods 9 are connected with the bottom ends of the two groups of fixing columns 4; a sliding groove 11 is longitudinally arranged on the inner rear side wall of the barrel 1, and a sliding rod 12 is fixed at the sliding groove 11 in a sliding manner; the device can drive two groups of fixed plates to move transversely by manually rotating two groups of screw rods, so that an element is clamped between the two groups of fixed plates and can be conveniently fixed, the practicability of the device is improved, the screw rods are limited by two groups of limiting columns and are not easy to screw down and fall off, meanwhile, two groups of fixed columns on two groups of first threaded rods can be driven by manually rotating two groups of first threaded pipes to move longitudinally, the clamping heights of the two groups of fixed plates can be adjusted according to the size of the element, the adaptability of the device is improved, the first limiting piece limits the first threaded pipes to prevent the first threaded pipes from being leaped out of a first placing groove, the first limiting piece is rigidly connected with the first threaded pipes, when the first threaded pipes rotate, the first limiting piece rotates along with the first threaded pipes, and a first ball bearing is clamped between a first blocking piece and the first limiting piece, so that the first placing groove cannot be leaped out, the first limiting sheet and the first placing groove can be mechanically locked, so that the first limiting sheet can be further fixed conveniently; the sliding rod can be slid to be in contact with the element, and the sliding rod and the scales are compared, so that the comparison is convenient, and the use is convenient.

The utility model discloses a measuring cylinder structure, still include motor 13, transmission shaft 14, first gear 15 and two sets of second gears 16, motor 13 installs in the middle part of placing 2 tops, and two sets of second gears 16 are fixed the suit respectively in the outside of two sets of first screwed

pipes

8, and 14 bottoms of transmission shaft are connected with motor 13 top output, and 14 tops of transmission shaft are connected with 15 bottoms of first gear, and two sets of second gears 16 all mesh with first gear 15; it can drive the epaxial first gear of transmission through the motor and rotate to because two sets of second gears all make first gear drive two sets of second gears with first gear engagement's design and rotate, thereby conveniently drive two sets of second screwed pipes and carry out synchronous rotation, it is more convenient to adjust and use, the motor is the common electrical part in market, only need to connect according to the instruction book electricity of buying back together when buying back the use and can use, so no longer give consideration to here.

The utility model discloses a measuring cylinder structure, still include two sets of bradyseism boards 17, two sets of bradyseism springs and two sets of bradyseism pieces 18, two sets of bradyseism boards 17 bottom are connected with the left side and the right side of placing 2 tops of piece respectively, two sets of bradyseism spring one end are connected with two sets of bradyseism boards 17 inboard respectively, two sets of bradyseism spring other ends are connected with two sets of bradyseism pieces 18 respectively, the motor 13 clamps between two sets of bradyseism pieces 18; it can drive two sets of bradyseism pieces through two sets of bradyseism springs and rock the work of motor and carry out the bradyseism, improves the practicality.

The utility model discloses a measuring cylinder structure, still include two sets of pivots 19 and two sets of rotor plates 20, the inboard of two sets of fixed plates 6 all is provided with the second standing groove, and be provided with second ball bearing and second spacing piece inside two sets of second standing grooves, two sets of second standing groove inboard all is provided with second separation blade 21, two sets of pivot 19 outer ends pass two sets of second separation blades 21 respectively and insert respectively to two sets of second ball bearing inside and be connected with two sets of second spacing pieces respectively, two sets of pivot 19 inner is connected with two sets of rotor plates 20 respectively; it can rotate when making two sets of rotor plates conveniently clip the component through manual rotation two sets of pivots, improves adaptability, and the spacing piece of second counter shaft is spacing, prevents that it from leaping out the second standing groove, and spacing piece of second and pivot rigid coupling, and when the pivot rotated, the spacing piece of second rotated along with it together, and second ball bearing clamps between second separation blade and the spacing piece of second, thereby can not leap out the second standing groove, can mechanical locking between spacing piece of second and the second standing groove, thereby make things convenient for the spacing piece of second to further fix.

The utility model discloses a measuring cylinder structure, still include two sets of locking plates 22, two sets of cover spring groups 23 and two sets of scalable nest of tubes 24, two sets of cover spring groups 23 one end respectively with two sets of rotor plates 20 inboard connection, two sets of cover spring groups 23 other ends respectively with two sets of locking plates 22 connection, two sets of scalable nest of tubes 24 one end respectively with two sets of rotor plates 20 inboard connection, two sets of scalable nest of tubes 24 other ends respectively with two sets of locking plates 22 connection, two sets of cover spring groups 23 are respectively the suit in two sets of scalable nest of tubes 24 outsides; it can drive two sets of locking integrated circuit boards through two sets of cover spring groups and supplementary the clamp when fixed, improves fixed reliability, and the difficult distortion of distortion is organized to the supplementary cover spring of scalable nest of tubes.

The utility model discloses a measuring cylinder structure, still include support frame 25 and four groups of supporting legs 26, the top of four groups of supporting legs 26 is installed respectively in the left front side, right front side, left rear side and right rear side of support frame 25 bottom, the bottom of four groups of supporting legs 26 is all installed on placing block 2 top, first gear 15 is located the support frame 25 below; it can make things convenient for the component to support through the support frame and place, improves and uses the reliability.

The utility model discloses a measuring cylinder structure, a slide way is arranged in the front and back direction of the inner bottom side wall of a cylinder body 1, and a placing block 2 can be fixed at the slide way in a sliding way; the sliding block can be fixed on the slide rail in a sliding mode through the placing block in a sliding mode, the element is driven to slide, the adaptability of the sliding block is improved, the placing block and the slide rail can be mechanically locked, and therefore the placing block can be conveniently placed and further fixed.

The utility model discloses a measuring cylinder structure, still include four groups of second threaded rods 27, four groups of second screwed pipes 28 and four groups of weight 29, the top of four groups of second threaded rods 27 is installed respectively in barrel 1 bottom left front side, right front side, left rear side and right rear side, four groups of second threaded rods 27 bottom spiral shell dress to the inside of four groups of second screwed pipes 28 tops respectively, four groups of weight 29 are installed respectively in four groups of second screwed pipes 28 bottoms; it can make it and second threaded rod cooperation length adaptation place the face through rotatory four groups of second screwed pipes when whole place the face not flat enough, improves the practicality, and four groups of weights improve whole stability of placing.

The utility model relates to a measuring cylinder structure, which can be used for manually rotating two sets of screws to drive two sets of fixed plates to move transversely, so that an element measuring clamp is clamped between the two sets of fixed plates, the element measuring clamp can be conveniently fixed, the practicability of the element measuring clamp is improved, the screws are limited by two sets of limiting columns to be not easy to screw down and fall off, meanwhile, two sets of fixed columns on two sets of first threaded rods can be driven to move longitudinally by manually rotating two sets of first threaded pipes, the clamping heights of the two sets of fixed plates can be adjusted according to the sizes of the elements, the adaptability of the elements is improved, the first limiting sheets limit the first threaded pipes to prevent the first threaded pipes from exiting out of a first placing groove, the first limiting sheets are rigidly connected with the first threaded pipes, when the first threaded pipes rotate, the first limiting sheets rotate along with the first limiting sheets, and first ball bearings are clamped between the first retaining sheets and the first limiting sheets, therefore, the first placing groove cannot be formed, and the first limiting piece and the first placing groove can be mechanically locked, so that the first limiting piece can be further fixed conveniently; the sliding rod can be slid to be in contact with the element, and the comparison is more convenient through the comparison between the sliding rod and the scale, so that the use is more convenient; the motor is a common electric device in the market, and can be used only by being electrically connected according to a purchased instruction book when being bought for use, so that the motor is not repeated; the two groups of cushioning springs can drive the two groups of cushioning blocks to cushion the working shake of the motor, so that the practicability is improved; the two groups of rotating plates can be rotated by manually rotating the two groups of rotating shafts to conveniently clamp elements, the adaptability is improved, the second limiting piece limits the rotating shaft to prevent the rotating shaft from jumping out of the second placing groove, the second limiting piece is rigidly connected with the rotating shafts, the second limiting piece rotates along with the rotating shafts when the rotating shafts rotate, and the second ball bearing is clamped between the second blocking piece and the second limiting piece, so that the second placing groove cannot be jumped out, and the second limiting piece and the second placing groove can be mechanically locked, so that the second limiting piece is further fixed conveniently; the two groups of sleeve spring groups can drive the two groups of locking boards to be clamped in an auxiliary mode when being fixed, so that the fixing reliability is improved, and the telescopic pipe group is not easy to distort and deform in an auxiliary sleeve spring group; the elements can be supported and placed conveniently through the supporting frame, and the use reliability is improved; the placing block can be fixed on the slideway in a sliding manner, so that the element can be driven to slide, the adaptability of the placing block is improved, and the placing block and the slideway can be mechanically locked, so that the placing block can be further fixed conveniently; when whole placing surface is not flat enough, can make it adapt to the placing surface with second threaded rod cooperation length through the second screwed pipe of rotatory four groups, improve the practicality, four groups of weights improve whole stability of placing.

The utility model discloses a measure a section of thick bamboo structure, above the mounting means, the connected mode or the mode that sets up of all parts are common mechanical system to the concrete structure, model and the coefficient index of all its parts are its from taking the technique, as long as can reach all can implementing of its beneficial effect, so do not add at many and give unnecessary details.

In the case where no description is given to the contrary, the directional terms included in the terms "up, down, left, right, front, rear, inner, and vertical and horizontal" of the measuring cylinder structure of the present invention only represent the orientation of the term in the normal use state, or be a trivial term understood by those skilled in the art, and should not be considered as limiting the term, at the same time, the numerical terms "first," "second," and "third," etc. do not denote any particular quantity or order, but rather are used to distinguish one from another, furthermore, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements, but also includes other elements not expressly listed or inherent to such process, method, article, or apparatus.

The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, a plurality of modifications and variations can be made without departing from the technical principle of the present invention, and these modifications and variations should also be regarded as the protection scope of the present invention.

Claims

1. A measuring cylinder structure comprises a cylinder body (1) and a placing block (2), wherein a working cavity is arranged in the cylinder body (1), a taking and placing opening is communicated with the front side of the cylinder body (1), and scales (3) are arranged on the inner rear side wall of the cylinder body (1); the novel screw rod fixing device is characterized by further comprising two groups of fixing columns (4), two groups of screw rods (5) and two groups of fixing plates (6), the inner ends of the two groups of screw rods (5) are respectively screwed to penetrate through the outer side walls of the two groups of fixing columns (4) and respectively screwed to penetrate through the inner sides of the two groups of fixing columns (4) to be connected with the two groups of fixing plates (6), the outer ends of the two groups of screw rods (5) are respectively provided with limiting columns (7), the novel screw rod fixing device further comprises two groups of first threaded pipes (8) and two groups of first threaded rods (9), the left side and the right side of the top end of the placing block (2) are respectively provided with first placing grooves, the two groups of first threaded pipes are respectively provided with first blocking pieces (10), the bottom ends of the two groups of first threaded pipes (8) are respectively penetrated through the two groups of blocking pieces to be inserted into the two groups of first threaded bearings and respectively connected with the two groups of first limiting pieces, and the bottom ends of the The top ends of the two groups of first threaded rods (9) are respectively connected with the bottom ends of the two groups of fixed columns (4); the inner rear side wall of the cylinder body (1) is longitudinally provided with a sliding chute (11), and a sliding rod (12) is fixed at the sliding chute (11) in a sliding way.

2. The measuring cylinder structure according to claim 1, further comprising a motor (13), a transmission shaft (14), a first gear (15) and two sets of second gears (16), wherein the motor (13) is installed in the middle of the top end of the placing block (2), the two sets of second gears (16) are respectively and fixedly sleeved outside the two sets of first threaded pipes (8), the bottom end of the transmission shaft (14) is connected with the top output end of the motor (13), the top end of the transmission shaft (14) is connected with the bottom end of the first gear (15), and the two sets of second gears (16) are both meshed with the first gear (15).

3. The structure of the measuring cylinder as defined in claim 2, further comprising two sets of shock absorbing plates (17), two sets of shock absorbing springs and two sets of shock absorbing blocks (18), wherein the bottom ends of the two sets of shock absorbing plates (17) are respectively connected with the left side and the right side of the top end of the placing block (2), one ends of the two sets of shock absorbing springs are respectively connected with the inner sides of the two sets of shock absorbing plates (17), the other ends of the two sets of shock absorbing springs are respectively connected with the two sets of shock absorbing blocks (18), and the motor (13) is clamped between the two sets of shock absorbing blocks (18).

4. The measuring cylinder structure according to claim 3, further comprising two sets of rotating shafts (19) and two sets of rotating plates (20), wherein the two sets of fixing plates (6) are provided with second placing grooves inside, and second ball bearings and second limiting plates are arranged inside the two sets of second placing grooves, the two sets of second placing grooves are provided with second blocking pieces (21) inside, the outer ends of the two sets of rotating shafts (19) respectively penetrate through the two sets of second blocking pieces (21) and respectively insert into the two sets of second ball bearings to be respectively connected with the two sets of second limiting plates, and the inner ends of the two sets of rotating shafts (19) are respectively connected with the two sets of rotating plates (20).

5. The structure of a measuring cylinder according to claim 4, characterized by further comprising two sets of locking plates (22), two sets of springing sets (23), and two sets of retractable tube sets (24), wherein one end of each of the two sets of springing sets (23) is connected to the inner sides of the two sets of rotating plates (20), the other end of each of the two sets of springing sets (23) is connected to the corresponding one of the two sets of locking plates (22), one end of each of the two sets of retractable tube sets (24) is connected to the inner sides of the two sets of rotating plates (20), the other end of each of the two sets of retractable tube sets (24) is connected to the corresponding one of the two sets of locking plates (22), and the two sets of springing sets (.

6. The measuring cylinder structure according to claim 5, further comprising a support frame (25) and four sets of support legs (26), wherein the top ends of the four sets of support legs (26) are respectively installed at the left front side, the right front side, the left rear side and the right rear side of the bottom end of the support frame (25), the bottom ends of the four sets of support legs (26) are all installed at the top end of the placement block (2), and the first gear (15) is located below the support frame (25).

7. The structure of a measuring cylinder according to claim 6, characterized in that the inner bottom sidewall of the cylinder (1) is provided with a slide way in the front-back direction, and the placing block (2) is slidably fixed at the slide way.

8. The structure of a measuring cylinder according to claim 7, further comprising four sets of second threaded rods (27), four sets of second threaded pipes (28), and four sets of weight blocks (29), wherein the top ends of the four sets of second threaded rods (27) are respectively mounted on the front left side, the front right side, the rear left side, and the rear right side of the bottom end of the cylinder (1), the bottom ends of the four sets of second threaded rods (27) are respectively screwed into the top ends of the four sets of second threaded pipes (28), and the four sets of weight blocks (29) are respectively mounted on the bottom ends of the four sets of second threaded pipes (28).