CN214703639U

CN214703639U - Contact type testing device for cement concrete expansion and contraction test

Info

Publication number: CN214703639U
Application number: CN202120938834.2U
Authority: CN
Inventors: 路万东
Original assignee: Individual
Current assignee: Individual
Priority date: 2021-04-30
Filing date: 2021-04-30
Publication date: 2021-11-12
Anticipated expiration: 2031-04-30

Abstract

The utility model discloses a contact test device is used in cement concrete expansion and contraction test, including laboratory bench, supporting legs, first slider, backup pad, displacement sensor transmitting terminal, displacement sensor receiving terminal, centre gripping fixed knot construct and contact measurement structure, the equal fixedly connected with supporting legs in bottom surface four corners department of laboratory bench, the upper surface department of laboratory bench is provided with the spout, the spout department of laboratory bench slides and is provided with first slider, the fixed backup pad that is provided with in upper surface department of first slider, the fixed mounting of upper surface department of backup pad has the contact measurement structure, the fixed mounting of upper surface department of laboratory bench has centre gripping fixed knot to construct. The utility model discloses a centre gripping fixed knot constructs can carry out the centre gripping spacing fixed to cement experiment piece, and fixed easy operation is convenient, and the angular adjustment of cement experiment piece is convenient simultaneously, is fit for promoting, can be comparatively convenient carry out the contact measurement to each position department of cement through the contact measurement structure.

Description

Contact type testing device for cement concrete expansion and contraction test

Technical Field

The utility model belongs to the technical field of the cement experiment of riding and specifically relates to a contact test device is used in cement concrete expansion and contraction test.

Background

Cement: a powdered hydraulic inorganic cementitious material. After water is added and stirred, the mortar can be hardened in the air or in water and can firmly bond sand, stone and other materials together, the early mixture of lime and volcanic ash is very similar to the modern lime-volcanic ash cement, and concrete made of broken stone cemented by the mortar not only has higher strength, but also can resist the erosion of fresh water or salt-containing water after being hardened. As an important cementing material, the high-performance cement is widely applied to engineering such as civil construction, water conservancy, national defense and the like for a long time.

During the cement expansion and contraction experiment, corresponding experimental device needs to be used, the measurement of the traditional experimental device is not convenient enough, and the expansion and contraction numerical values of all parts of the cement experiment block are different and inconvenient to measure. Therefore, a contact type test device for the expansion and contraction test of the cement concrete is provided for solving the problems.

SUMMERY OF THE UTILITY MODEL

The contact type test device for the cement concrete expansion and contraction test is provided in the embodiment and used for solving the problems that a common test device in the prior art is inconvenient to fix a cement block and cannot measure each position of the cement block.

According to one aspect of the utility model, a contact test device for cement concrete expansion and contraction test is provided, which comprises a test bench, a supporting leg, a first slider, a supporting plate, a displacement sensor transmitting end, a displacement sensor receiving end, a clamping and fixing structure and a contact measurement structure;

the utility model discloses a fixed mounting of experiment table, including the bottom surface of experiment table, the equal fixedly connected with supporting legs in bottom surface four corners department of experiment table, the upper surface department of experiment table is provided with the spout, the spout department of experiment table slides and is provided with first slider, the fixed backup pad that is provided with in upper surface department of first slider, the fixed contact measurement structure that has of upper surface department of backup pad, the fixed mounting of upper surface department of experiment table has centre gripping fixed knot to construct.

Further, the contact measurement structure includes a rectangle shell, lifting slide block, a threaded rod, No. two rectangle shells, slider, No. two threaded rods, ejector pin, a twist grip and No. two twist grips, the fixed rectangle shell that is provided with of upper surface department of backup pad, it is provided with lifting slide block to slide in the inner chamber of a rectangle shell, the lateral wall department of a rectangle shell slides and is provided with No. two rectangle shells, fixed connection between No. two rectangle shells and the lifting slide block, it is provided with the slider to slide in the inner chamber of No. two rectangle shells, the one end of the lateral wall department fixedly connected with ejector pin of slider, the other end of ejector pin runs through the inner chamber lateral wall of No. two rectangle shells and extends to outside the wall.

Further, the upper surface department of a rectangle shell rotates and installs a turning handle, turning handle's one end extends to the inner chamber of a rectangle shell in, turning handle's one end department one end of fixedly connected with threaded rod No. one, the other end of a threaded rod extend to the inner chamber diapire department of a rectangle shell and with rotate between the inner chamber diapire of a rectangle shell and be connected, a threaded rod run through between lifting slide and the lifting slide screw-thread fit.

Further, No. two lateral wall departments of rectangle shell rotate and are connected with a twist grip, a twist grip's one end extends to in the inner chamber of No. two rectangle shells, a twist grip's one end department fixedly connected with one end of threaded rod No. two, No. two the other end of threaded rod extend to No. two rectangle shells the inner chamber lateral wall department and with No. two rectangle shells between rotate and be connected, No. two the threaded rod run through the slider and with the slider between screw-thread fit.

Furthermore, a displacement sensor transmitting end is fixedly installed on the upper surface of the supporting plate, and a displacement sensor receiving end is fixedly installed on the upper surface of the experiment table.

Further, the bottom surface department fixed mounting of first slider has the second slider, sliding connection has the spout shell on the second slider, the bottom surface department fixedly connected with fixed block of spout shell, the one end of the equal fixedly connected with spring in both ends department of second slider, the other end of spring extend to the lateral wall department of spout shell and with the spout shell between fixed connection, the bottom surface department fixed mounting of laboratory bench has servo motor, servo motor's the terminal one end of fixedly connected with hob of output shaft, the other end of hob run through the fixed block and with between the fixed block screw-thread fit.

Further, centre gripping fixed knot constructs including rotating seat, connecting plate, fixed plate, screw rod, movable clamp plate, decide splint and connecting block, the upper surface department of laboratory bench rotates and installs and rotate the seat, the one end of the upper surface department fixedly connected with connecting plate of rotating the seat, the other end department fixedly connected with fixed plate of connecting plate, it is provided with movable clamp plate to slide on the fixed plate, the bottom department fixedly connected with connecting block of movable clamp plate, the fixed plate is decided to the upper surface department fixedly connected with of fixed plate, the bottom surface department of fixed plate rotates the one end that the installation was provided with the screw rod, the other end through connection piece of screw rod and the connecting block between screw-thread fit.

Through the above-mentioned embodiment of the utility model, can carry out the spacing fixed of centre gripping to cement experiment piece through centre gripping fixed knot structure, fixed operation is simple and convenient, and the angular adjustment of cement experiment piece is convenient simultaneously, is fit for promoting, can be comparatively convenient carry out the contact measurement to each position department of cement through the contact measurement structure, and the effectual numerical value to cement inflation shrink is measured, has improved the effect that detects, and cooperation centre gripping fixed knot structure can be so that cement inflation detection effect is better.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without inventive exercise.

Fig. 1 is a schematic perspective view of an embodiment of the present invention;

fig. 2 is a schematic diagram of the internal structure of an embodiment of the present invention;

fig. 3 is a schematic diagram of a partially enlarged structure at a in fig. 2 according to an embodiment of the present invention;

fig. 4 is a schematic side view of a movable clamp plate according to an embodiment of the present invention.

In the figure: 1. experiment table, 2, supporting legs, 3, first slider, 4, a supporting plate, 5, rectangular shell, 6, lifting slide block, 7, threaded rod, 8, rectangular shell No. two, 9, the slider, 10, threaded rod No. two, 11, the ejector pin, 12, turning handle, 13, turning handle No. two, 14, the second slider, 15, the spout shell, 16, the spring, 17, the fixed block, 18, servo motor, 19, the hob, 20, the seat that rotates, 21, the connecting plate, 22, the fixed plate, 23, the screw rod, 24, move the splint, 25, decide splint, 26, the connecting block, 27, the displacement sensor transmitting terminal, 28, the displacement sensor receiving terminal.

Detailed Description

In order to make the technical solution of the present invention better understood, the technical solution of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts shall belong to the protection scope of the present invention.

It should be noted that the terms "first," "second," and the like in the description and claims of the present invention and in the drawings described above are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used may be interchanged under appropriate circumstances for purposes of describing the embodiments of the invention herein. Furthermore, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed, but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.

In the present invention, the terms "upper", "lower", "left", "right", "front", "rear", "top", "bottom", "inner", "outer", "middle", "vertical", "horizontal", "lateral", "longitudinal", and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings. These terms are used primarily to better describe the invention and its embodiments, and are not intended to limit the indicated devices, elements or components to a particular orientation or to be constructed and operated in a particular orientation.

Moreover, some of the above terms may be used to indicate other meanings besides the orientation or positional relationship, for example, the term "on" may also be used to indicate some kind of attachment or connection relationship in some cases. The specific meaning of these terms in the present invention can be understood by those of ordinary skill in the art as appropriate.

Furthermore, the terms "mounted," "disposed," "provided," "connected," and "sleeved" are to be construed broadly. For example, it may be a fixed connection, a removable connection, or a unitary construction; can be a mechanical connection, or an electrical connection; may be directly connected, or indirectly connected through intervening media, or may be in internal communication between two devices, elements or components. The specific meaning of the above terms in the present invention can be understood according to specific situations by those skilled in the art.

It should be noted that, in the present invention, the embodiments and features of the embodiments may be combined with each other without conflict. The present invention will be described in detail below with reference to the accompanying drawings in conjunction with embodiments.

The clamping and fixing structure in this embodiment can be applied to various experimental devices, for example, the following experimental device is provided in this embodiment, and the clamping and fixing structure in this embodiment can be used to assist the following experimental device.

The experimental device comprises a base plate, wherein two sliding rails are vertically fixed on two sides of the upper end surface of the base plate, a top plate is fixed between the top ends of the two sliding rails, sliding blocks are in sliding fit with the surfaces of the sliding rails, two lifting motors are fixed on two sides of the upper surface of the top plate, the output ends of the lifting motors are connected with screw shafts in threaded fit with the sliding blocks, a fixing frame is fixed between the sliding blocks of the two sliding rails, a slump cone is sleeved in the middle of the fixing frame, and the peripheral side of the slump cone is fixed with the fixing frame through bolts; the utility model discloses a tamping machine, including roof, top plate, eccentric wheel, double-screw bolt, guide pillar, bench-top, pedestal, scale, roof, tamping plate, roof, guide pillar bottom, guide pillar and roof vertical sliding connection, the eccentric wheel is fixed with through eccentric rotor swing joint to the roof upper end face, the eccentric wheel has the swinging arms through eccentric rotor swing joint, swinging arms one end articulates there is the guide pillar, the guide pillar bottom runs through the roof to the guide pillar is with the vertical sliding connection of roof, guide pillar inner wall threaded connection has the double-screw bolt, the double-screw bolt bottom is fixed with the tamping dish, double-screw bolt, guide pillar and slump section of thick bamboo set up with one heart, furtherly, be fixed with the scale between base plate and the roof, the scale is located mount one side to mount surface fixation has the sign arrow with scale matched with, furtherly, double-screw bolt bottom week surface fixation has the hand wheel, furtherly, the diameter of tamping dish is less than the internal diameter of slump section of thick bamboo, furtherly, the double-screw bolt top can run through to the guide pillar top.

Of course, the present embodiment can also be used to assist experimental devices of other structures. Give unnecessary details here again one by one, introduce the utility model discloses contact test device is used in cement concrete expansion and contraction test below.

Referring to fig. 1-4, a contact test apparatus for cement concrete expansion and contraction test includes a test table 1, a supporting leg 2, a first slider 3, a supporting plate 4, a displacement sensor emitting end 27, a displacement sensor receiving end 28, a clamping and fixing structure, and a contact measurement structure;

the four corners of the bottom surface of the experiment table 1 are fixedly connected with supporting legs 2, the upper surface of the experiment table 1 is provided with a chute, a first sliding block 3 is arranged at the sliding groove of the experiment table 1 in a sliding way, a supporting plate 4 is fixedly arranged at the upper surface of the first sliding block 3, the upper surface of the supporting plate 4 is fixedly provided with a contact measurement structure, the upper surface of the experiment table 1 is fixedly provided with a clamping and fixing structure, the cement experiment block can be clamped, limited and fixed through the clamping and fixing structure, the fixing operation is simple and convenient, simultaneously, the angle adjustment of the cement experiment block is convenient, the cement experiment block is suitable for popularization, the contact measurement can be conveniently carried out on each position of cement through the contact measurement structure, the effective numerical value of the expansion and contraction of the cement is measured, the detection effect is improved, and the cement expansion detection effect can be better due to the cooperation of the clamping and fixing structure.

The contact measurement structure comprises a first rectangular shell 5, a lifting slide block 6, a first threaded rod 7, a second rectangular shell 8, a slide block 9, a second threaded rod 10, a push rod 11, a first rotating handle 12 and a second rotating handle 13, wherein the first rectangular shell 5 is fixedly arranged on the upper surface of the support plate 4, the lifting slide block 6 is arranged in the inner cavity of the first rectangular shell 5 in a sliding manner, the second rectangular shell 8 is arranged on the side wall of the first rectangular shell 5 in a sliding manner, the second rectangular shell 8 is fixedly connected with the lifting slide block 6, the slide block 9 is arranged in the inner cavity of the second rectangular shell 8 in a sliding manner, one end of the push rod 11 is fixedly connected to the side wall of the slide block 9, the other end of the push rod 11 penetrates through the inner cavity side wall of the second rectangular shell 8 and extends out of the wall, and cement is measured on the outer surface of a cement experiment block for multiple times by abutting against the push rod 11 for multiple times, the measured data is calculated to obtain the expansion and contraction values; a first rotating handle 12 is rotatably mounted on the upper surface of the first rectangular shell 5, one end of the first rotating handle 12 extends into an inner cavity of the first rectangular shell 5, one end of the first rotating handle 12 is fixedly connected with one end of a first threaded rod 7, the other end of the first threaded rod 7 extends to the bottom wall of the inner cavity of the first rectangular shell 5 and is rotatably connected with the bottom wall of the inner cavity of the first rectangular shell 5, the first threaded rod 7 penetrates through the lifting slide block 6 and is in threaded fit with the lifting slide block 6, the first threaded rod 7 is driven to rotate by rotating the second rotating handle 13, the lifting slide block 6 is driven to move up and down, and the vertical position of the ejector rod 11 can be adjusted; a first rotating handle 12 is rotatably connected to the side wall of the second rectangular shell 8, one end of the first rotating handle 12 extends into the inner cavity of the second rectangular shell 8, one end of the first rotating handle 12 is fixedly connected with one end of a second threaded rod 10, the other end of the second threaded rod 10 extends to the side wall of the inner cavity of the second rectangular shell 8 and is rotatably connected with the second rectangular shell 8, the second threaded rod 10 penetrates through the sliding block 9 and is in threaded fit with the sliding block 9, the second threaded rod 10 is driven to rotate through the rotation of the first rotating handle 12, the sliding block 9 is driven to move, and the horizontal position of the ejector rod 11 can be adjusted; a displacement sensor transmitting end 27 is fixedly installed on the upper surface of the supporting plate 4, a displacement sensor receiving end 28 is fixedly installed on the upper surface of the experiment table 1, the position of the displacement sensor transmitting end 27 can be detected and measured through the displacement sensor receiving end 28, and then the expansion and contraction numerical value of cement is calculated; the bottom surface of the first slider 3 is fixedly provided with a second slider 14, the second slider 14 is slidably connected with a chute shell 15, the bottom surface of the chute shell 15 is fixedly connected with a fixed block 17, two ends of the second slider 14 are fixedly connected with one end of a spring 16, the other end of the spring 16 extends to the side wall of the chute shell 15 and is fixedly connected with the chute shell 15, the bottom surface of the experiment table 1 is fixedly provided with a servo motor 18, the tail end of an output shaft of the servo motor 18 is fixedly connected with one end of a spiral rod 19, the other end of the spiral rod 19 penetrates through the fixed block 17 and is in spiral fit with the fixed block 17, the spiral rod 19 is driven to rotate by the work of the servo motor 18, the fixed block 17 is driven to move, the support plate 4 is driven to move, the ejector rod 11 is contacted with the surface of a cement experiment block to be measured, and the arrangement of the spring 16 plays a role in buffering, inaccurate measurement caused by the fact that the ejector rod 11 damages a cement experiment block is avoided; the clamping and fixing structure comprises a rotating seat 20, a connecting plate 21, a fixing plate 22, a screw 23, a movable clamping plate 24, a fixed clamping plate 25 and a connecting block 26, wherein the upper surface of the experiment table 1 is rotatably provided with the rotating seat 20, the upper surface of the rotating seat 20 is fixedly connected with one end of the connecting plate 21, the other end of the connecting plate 21 is fixedly connected with the fixing plate 22, the fixed plate 22 is provided with the movable clamping plate 24 in a sliding manner, the bottom end of the movable clamping plate 24 is fixedly connected with the connecting block 26, the upper surface of the fixing plate 22 is fixedly connected with the fixed clamping plate 25, the bottom surface of the fixing plate 22 is rotatably provided with one end of the screw 23, the other end of the screw 23 penetrates through the connecting block 26 and is in threaded fit with the connecting block 26, the position of the movable clamping plate 24 can be adjusted through the manual rotation of the screw 23, and the clamping between the movable clamping plate 24 and the fixed clamping plate 25 is further used for limiting and fixing the cement experiment block, conveniently measure, the screw thread is provided with spacing bolt on the seat 20 rotates, supports the upper surface of tight laboratory bench 1 through spacing bolt and then fixes the angle of connecting plate 21.

When the utility model is used, firstly, the cement experimental block is placed at the upper surface of the fixed plate 22, the position of the movable clamping plate 24 can be adjusted by manually rotating the screw rod 23, the cement experimental block is limited and fixed by clamping the movable clamping plate 24 and the fixed clamping plate 25, the screw rod 19 is driven to rotate by the work of the servo motor 18, the fixed block 17 is driven to move, the supporting plate 4 is driven to move, the ejector rod 11 is contacted with the outer surface of the cement block, at the moment, the position of the transmitting end 27 of the displacement sensor at the side of the receiving end 28 of the displacement sensor is recorded with data, after the cement experimental block expands and contracts, the operation is repeated, the ejector rod 11 is contacted with the outer surface of the cement experimental block again, the data is recorded, the data is calculated twice, the expanding and contracting value can be obtained, the threaded rod 7 can be driven to rotate by rotating the second rotating handle 13, and then drive lifting slide 6 and reciprocate, can adjust the vertical position of ejector pin 11, drive No. two threaded rods 10 through the rotation of a twist grip 12 and rotate, and then drive slider 9 and remove, can adjust the horizontal position of ejector pin 11, can make ejector pin 11 contact cement's the different positions of surface, measure the inflation numerical value of different positions, application range is more extensive.

The utility model discloses an useful part lies in:

1. the utility model discloses rational in infrastructure, convenient to use, the utility model discloses have centre gripping fixed knot structure, can carry out the spacing fixed of centre gripping to the cement experiment piece through centre gripping fixed knot structure, fixed operation is simple and convenient, and the angular adjustment of cement experiment piece is convenient simultaneously, is fit for promoting;

2. the utility model discloses a contact measurement structure can be comparatively convenient each position department to cement carry out the contact measurement, and effectual numerical value to cement inflation shrink is measured, has improved the effect that detects, and cooperation centre gripping fixed knot constructs can so that cement inflation detection effect is better.

It is well within the skill of those in the art to implement, without undue experimentation, the present invention does not relate to software and process improvements, as related to circuits and electronic components and modules.

The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. The utility model provides a contact test device is used in test of cement concrete expansion and contraction which characterized in that: the device comprises an experiment table (1), supporting legs (2), a first sliding block (3), a supporting plate (4), a displacement sensor transmitting end (27), a displacement sensor receiving end (28), a clamping and fixing structure and a contact measurement structure;

the utility model discloses a test bench, including the equal fixedly connected with supporting legs of bottom surface four corners department (2) of laboratory bench (1), the upper surface department of laboratory bench (1) is provided with the spout, the spout department of laboratory bench (1) slides and is provided with first slider (3), the fixed backup pad (4) that are provided with of upper surface department of first slider (3), the fixed contact measurement structure of upper surface department of backup pad (4), the fixed mounting of upper surface department of laboratory bench (1) has centre gripping fixed knot to construct.

2. The contact type test device for the expansion and contraction test of the cement concrete according to claim 1, wherein: the contact measurement structure comprises a first rectangular shell (5), a lifting slide block (6), a first threaded rod (7), a second rectangular shell (8), a slide block (9), a second threaded rod (10), a mandril (11), a first rotating handle (12) and a second rotating handle (13), a first rectangular shell (5) is fixedly arranged on the upper surface of the supporting plate (4), a lifting slide block (6) is arranged in the inner cavity of the first rectangular shell (5) in a sliding way, a second rectangular shell (8) is arranged at the side wall of the first rectangular shell (5) in a sliding way, the second rectangular shell (8) is fixedly connected with the lifting slide block (6), a sliding block (9) is arranged in the inner cavity of the second rectangular shell (8) in a sliding way, one end of a mandril (11) is fixedly connected at the side wall of the slide block (9), the other end of the ejector rod (11) penetrates through the side wall of the inner cavity of the second rectangular shell (8) and extends out of the inner cavity.

3. The contact type test device for the expansion and contraction test of the cement concrete according to claim 2, wherein: the upper surface department of a rectangle shell (5) rotates and installs rotating handle (12) No. one, the one end of a rotating handle (12) extends to the inner chamber of a rectangle shell (5) in, the one end department fixedly connected with one end of threaded rod (7) of a rotating handle (12), the other end of a threaded rod (7) extend to the inner chamber diapire department of a rectangle shell (5) and rotate between the inner chamber diapire of a rectangle shell (5) and be connected, threaded rod (7) run through between lifting slide (6) and lifting slide (6) screw-thread fit.

4. The contact type test device for the expansion and contraction test of the cement concrete according to claim 2, wherein: lateral wall department of No. two rectangle shells (8) rotates and is connected with rotating handle (12) No. one, the one end of rotating handle (12) extends to the inner chamber of No. two rectangle shells (8), the one end of one end department fixedly connected with threaded rod (10) No. two of rotating handle (12), the other end of No. two threaded rod (10) extend to the inner chamber lateral wall department of No. two rectangle shells (8) and with No. two rectangle shells (8) between rotate and be connected, No. two threaded rod (10) run through between slider (9) and slider (9) screw-thread fit.

5. The contact type test device for the expansion and contraction test of the cement concrete according to claim 1, wherein: the upper surface department fixed mounting of backup pad (4) has displacement sensor transmitting terminal (27), the upper surface department fixed mounting of laboratory bench (1) has displacement sensor receiving terminal (28).

6. The contact type test device for the expansion and contraction test of the cement concrete according to claim 1, wherein: fixed mounting is located to the bottom surface of first slider (3) has second slider (14), sliding connection has spout shell (15) on second slider (14), the bottom surface fixedly connected with fixed block (17) of spout shell (15), the one end of the equal fixedly connected with spring (16) of both ends department of second slider (14), the other end of spring (16) extend to the lateral wall department of spout shell (15) and with spout shell (15) between fixed connection, the bottom surface department fixed mounting of laboratory bench (1) has servo motor (18), the one end of fixedly connected with hob (19) is located to the output shaft terminal department of servo motor (18), the other end of hob (19) run through fixed block (17) and with fixed block (17) between the screw fit.

7. The contact type test device for the expansion and contraction test of the cement concrete according to claim 1, wherein: the clamping and fixing structure comprises a rotating seat (20), a connecting plate (21), a fixing plate (22), a screw rod (23), a movable clamping plate (24), a fixed clamping plate (25) and a connecting block (26), wherein the rotating seat (20) is installed at the upper surface of the experiment table (1), one end of the connecting plate (21) is fixedly connected with the upper surface of the rotating seat (20), the fixing plate (22) is fixedly connected with the other end of the connecting plate (21), the movable clamping plate (24) is arranged on the fixing plate (22) in a sliding manner, the connecting block (26) is fixedly connected with the bottom end of the movable clamping plate (24), the fixed clamping plate (25) is fixedly connected with the upper surface of the fixing plate (22), one end of the screw rod (23) is arranged at the bottom surface of the fixing plate (22) in a rotating manner, the other end of the screw rod (23) penetrates through the connecting block (26) and is in threaded fit with the connecting block (26), and a limiting bolt is arranged on the rotating seat (20) in a threaded manner.