CN215141954U - Square hole grit screening instrument - Google Patents

Abstract

The utility model relates to a grit check out test set, mainly relate to a square hole grit screening instrument, it includes the mounting base, a workbench, square hole screen cloth and apron, be provided with vibrating motor in the mounting base, workstation fixed connection is on the mounting base, a plurality of square hole screen cloths are piled up on the workstation, the apron overlap joint is on the opening of square hole screen cloth, still include supporting screw and stabilizing mean, a plurality of supporting screw fixed connection are on the workstation, stabilizing mean includes connecting rod group and conflict subassembly, connecting rod group includes the head rod, second connecting rod and elastic component, the elastic component is passed through with the one end of second connecting rod to the one end of head rod and is connected, the other end and the supporting screw of head rod are connected, the one end that the head rod was kept away from to the second connecting rod is connected with the conflict subassembly, the lateral wall butt of conflict subassembly and square hole screen cloth. This application has the effect that improves device structural stability.

Description

Square hole grit screening instrument

Technical Field

The application relates to grit check out test set especially relates to a square hole grit screening instrument.

Background

The square hole sand sieve is a device for accurately sieving, detecting and filtering the granularity of particles and powdery substances and the solid content of liquid substances, and is widely applied to laboratories, laboratories and quality control rooms in a plurality of fields such as metallurgy, powder, chemical industry, medicine, construction, geology and the like.

At present, chinese patent with publication number CN205341260U discloses a grit divides appearance instrument, including base, driving motor connects under the base, a plurality of bracing pieces of fixedly connected with on the base, the cover is equipped with chassis and apron on the bracing piece, vertically pile up between chassis and the apron has a plurality of grit separation sieves, be provided with on the apron and press the splenium, press the splenium cover to establish on the bracing piece, grit separation sieve fixes on the base under the restriction of bracing piece, apron and pressing the splenium.

To the correlation technique among the above-mentioned, the inventor thinks that above-mentioned grit divides appearance instrument is at the in-process of vibration screening, because the bracing piece, press and be hard contact between splenium and the grit separation sieve, can lead to the bracing piece to take place to become flexible or deformation with pressing the splenium in the vibration process after a period of use, influence the fixed effect to the grit sieve, reduce the life of grit and divide appearance instrument.

SUMMERY OF THE UTILITY MODEL

In order to improve device structural stability, extension fixture's life, this application provides a square hole grit screening instrument and divides the instrument.

The application provides a square hole grit screening instrument adopts following technical scheme:

a square hole sandstone screening instrument comprises a mounting base, a workbench, a square hole screen and a cover plate, the mounting base is internally provided with a vibration motor, the workbench is fixedly connected on the mounting base, a plurality of square hole screens are longitudinally stacked on the workbench, the cover plate is lapped on the opening of the square hole screen at the topmost end, the square hole screen also comprises a plurality of supporting screw rods and a stabilizing mechanism, the plurality of supporting screw rods are fixedly connected on the workbench, the stabilizing mechanism comprises a connecting rod group and a butting component, the connecting rod group comprises a first connecting rod, a second connecting rod and an elastic piece, one end of the first connecting rod is connected with one end of the second connecting rod through an elastic piece, the other end of the first connecting rod is connected with the supporting screw rod, the one end that the first connecting rod was kept away from to the second connecting rod is connected with the subassembly of contradicting, the subassembly of contradicting is kept away from one side of second connecting rod and the lateral wall butt of square hole screen cloth.

Through adopting above-mentioned technical scheme, the square hole screen cloth is pressed from both sides in the centre by the subassembly of contradicting, and the device starts, and vibrating motor begins the function, and the square hole screen cloth that the drive was placed on the workstation takes place to vibrate and sieves. When the square hole screen generates vibration in the horizontal direction, the elastic piece has a buffering effect on impact force generated by the vibration. Through the setting of stabilizing mean, the structural stability of the device is improved, and the impact force that the supporting screw rod received is reduced, and the effect that the service life of the device is prolonged is achieved.

Optionally, the conflict subassembly includes slider and conflict piece, slider and second connecting rod fixed connection, the spout has been seted up on the conflict piece, spout and slider sliding fit, the both ends of slider all are provided with first spring, the axis direction of first spring is parallel with the glide direction of slider, the one end of first spring and the lateral wall fixed connection of slider, the other end of first spring and the inside wall fixed connection of spout work as during the lateral wall butt of conflict subassembly and square hole screen cloth, the spout is vertical setting.

Through adopting above-mentioned technical scheme, when square hole screen cloth took place the ascending rocking of vertical side, the slider took place to slide along vertical direction in the piece of contradicting, and the power that the second spring produced the square hole screen cloth is cushioned, has reduced the impact that the supporting screw who is connected with connecting rod group received, has also reduced the impaired possibility of device when guaranteeing that square hole screen cloth can fully vibrate.

Optionally, a containing cavity for containing the second connecting rod is formed in one end of the first connecting rod, one end of the second connecting rod is located in the containing cavity and is in sliding fit with the first connecting rod, a second spring is arranged in the containing cavity, one end of the second spring is fixedly connected with the bottom wall of the containing cavity, and the other end of the second spring is fixedly connected with one end of the second connecting rod in the containing cavity.

Through adopting above-mentioned technical scheme, when connecting rod group received the impact of horizontal direction, the second connecting rod slided in the chamber that holds of head rod, and the setting of second spring has reduced the impact force that the supporting screw received.

Optionally, the second connecting rod is provided with a connecting groove, the connecting groove is arranged in a direction parallel to the length direction of the second connecting rod, the first connecting rod is provided with a limiting hole, the limiting hole is communicated with the accommodating cavity, the limiting hole is connected with a limiting bolt in a threaded manner, and the limiting bolt penetrates through the first connecting rod through the limiting hole and stretches into the connecting groove.

Through adopting above-mentioned technical scheme, the setting up of spacing bolt provides spacing and direction for sliding of second connecting rod in holding the chamber, has also prevented simultaneously that the second connecting rod from deviating from the head rod at the in-process that slides.

Optionally, the support screw is provided with an installation block, the installation block is in threaded fit with the support screw, the installation block is provided with a first opening through which a first connecting rod passes, the installation block is provided with a first positioning hole, the positioning hole is communicated with the first opening, and the first connecting rod is provided with a plurality of second positioning holes along the length direction of the first connecting rod. And positioning pins are inserted into the first positioning hole and the second positioning hole.

Through adopting above-mentioned technical scheme, stabilizing mean is connected with supporting screw through the installation piece, adjusts the position of head rod in first trompil according to the diameter of square hole screen cloth for the subassembly of contradicting can be laminated with the lateral wall of square hole screen cloth all the time.

Optionally, the upper surface of workstation offers the constant head tank that is used for holding the square hole screen cloth, the square hole screen cloth is placed in the constant head tank, be provided with the rubber ring between the inside wall of constant head tank and the square hole screen cloth.

Through adopting above-mentioned technical scheme, the constant head tank makes the square hole screen cloth more stable with being connected of workstation, and the setting up of rubber ring has increaseed the frictional force between square hole screen cloth and the workstation, has further strengthened the stability of structure.

Optionally, the cover plate is provided with a fixing component and a pressing component, the fixing component comprises a propping frame, the abutting frame comprises an abutting disc and abutting rods, a second opening is formed in the abutting disc, the abutting rods are connected to the abutting disc at equal angular intervals, the number of the abutting rods is consistent with that of the supporting screw rods, one end of each abutting rod, far away from the abutting disc, is connected with the supporting screw rods, the pressing component comprises a pressing plate, a pressing rod, a limiting block and a third spring, the pressing plate is fixedly connected with one end of the pressing rod, the other end of the pressing rod is detachably connected with the limiting block, the third spring is sleeved on the pressing rod, the pressing rod is sleeved with the abutting frame through a second opening, one end of the third spring is abutted to the pressing plate, and the other end of the third spring is abutted to the abutting disc.

Through adopting above-mentioned technical scheme, when square hole screen cloth took place the ascending vibration of vertical direction, under the cooperation of supporting tight frame and third spring, the pressure strip supported tightly with the apron all the time, and the pressure strip reciprocates along with the apron together, has further strengthened the stability of device structure.

Optionally, fixedly connected with stopper on the one side of touch multitouch and square hole screen cloth contact, set up the spacing groove that corresponds with the stopper position on the lateral wall of square hole screen cloth, when the lateral wall butt of touch multitouch and square hole screen cloth, the stopper is pegged graft in the spacing groove.

Through adopting above-mentioned technical scheme, the setting up of spacing makes the connection of contact block and square hole screen cloth more inseparable, has further strengthened the stability of structure.

In summary, the present application includes at least one of the following beneficial technical effects:

1. the arrangement of the stabilizing mechanism improves the structural stability of the device, reduces the impact force on the supporting screw rod and has the effect of prolonging the service life of the device;

2. the setting up of constant head tank makes being connected of square hole screen cloth and workstation more stable, and the setting up of rubber ring has increaseed the frictional force between square hole screen cloth and the workstation, has further strengthened the stability of structure.

Drawings

FIG. 1 is a schematic structural diagram of an apparatus for screening square-hole sand in accordance with an embodiment of the present invention;

FIG. 2 is a partial view of a structure for embodying a stabilizing mechanism in an embodiment of the present application;

FIG. 3 is a cross-sectional view of an embodiment of the present application for embodying the structure of a stabilization mechanism;

fig. 4 is a schematic structural diagram for embodying the compressing assembly and the fixing assembly according to the embodiment of the present application.

Description of reference numerals: 1. mounting a base; 2. a work table; 21. positioning a groove; 3. a square hole screen; 31. a limiting groove; 4. a cover plate; 5. a vibration motor; 6. a rubber ring; 7. a support screw; 8. a stabilizing mechanism; 81. a collision component; 811. a slider; 812. a contact block; 8121. a chute; 813. a first spring; 814. a limiting strip; 82. a connecting rod group; 821. a first connecting rod; 8211. an accommodating chamber; 8212. a limiting hole; 8213. a second positioning hole; 822. a second connecting rod; 8221. connecting grooves; 823. a second spring; 824. a limit bolt; 9. a compression assembly; 91. a limiting block; 92. a compression plate; 93. a hold down bar; 94. a third spring; 10. a fixing assembly; 101. a support frame is tightly supported; 1011. tightly abutting against the disc; 1012. a tightening rod; 1013. a second opening; 1014. clamping the round hole; 1015. a clamping groove; 102. positioning a nut; 1021. a butt joint groove; 11. mounting blocks; 111. a first opening; 112. a first positioning hole; 12. and a positioning pin.

Detailed Description

The present application is described in further detail below with reference to figures 1-4.

The embodiment of the application provides a square hole grit screening instrument, and it has the effect that improves device structural stability, extension device life.

Referring to fig. 1, a square hole sand screening apparatus includes a mounting base 1, a table 2, a square hole screen 3, and a cover plate 4. Be provided with vibrating motor 5 in the mounting base 1, 2 fixed connection of workstation have seted up constant head tank 21 on the workstation 2 on the mounting base 1, and square hole screen cloth 3 is placed in constant head tank 21, is provided with rubber ring 6 between constant head tank 21 and the square hole screen cloth 3, the inside wall fixed connection of rubber ring 6 and constant head tank 21. A plurality of square hole screen cloth 3 vertically stack in proper order on workstation 2, and apron 4 overlap joint is on the opening of top square hole screen cloth 3.

Referring to fig. 1, three support screws 7 are fixedly connected to the table 2, and the support screws 7 are symmetrically disposed around the positioning groove 21 with the center of the positioning groove 21 as an axis. The supporting screw 7 is connected with a plurality of groups of stabilizing mechanisms 8 used for abutting against the side wall of the square hole screen 3, the cover plate 4 is provided with a pressing component 9 used for pressing the cover plate 4 and the square hole screen 3, and the pressing component 9 is connected with the supporting screw 7 through a fixing component 10.

Referring to fig. 1, when the screening is performed, a vibration motor 5 is started, and a square hole screen 3 placed on a table 2 is vibrated by the vibration motor to screen the material placed therein. The square hole screen 3 stacked together is fixed by the stabilizing mechanisms 8, so that the possibility of dislocation and separation of the square hole screen 3 is reduced. Compress tightly subassembly 9 and compress tightly apron 4 and square hole screen cloth 3, reduced the possibility that apron 4 dropped among the vibration process. The rubber ring 6 increases the friction force between the square hole screen 3 and the positioning groove 21, and reduces the possibility that the square hole screen 3 is separated from the positioning groove 21.

Referring to fig. 2 and 4, the stabilizing mechanism 8 includes an interference assembly 81 and a connecting rod set 82. The interference component 81 includes a slider 811 and an interference block 812. The supporting block 812 is provided with a sliding groove 8121, the sliding block 811 is in sliding fit with the sliding groove 8121, two opposite ends of the sliding block 811 are respectively provided with a first spring 813, the axis direction of the first spring 813 is parallel to the sliding direction of the sliding block 811, one end of the first spring 813 is fixedly connected with the sliding block 811, and the other end of the first spring is fixedly connected with the inner side wall of the sliding groove 8121. One side of the contact block 812 departing from the slider 811 is fixedly connected with two parallel limit bars 814, and the limit bars 814 are located at two ends of the contact block 812 in the vertical direction. The lateral wall of the square hole screen 3 is provided with a limiting groove 31 corresponding to the limiting strip 814, three rows of limiting grooves 31 are arranged on the square hole screen 3 at equal angular intervals, and two are arranged in each row.

Referring to fig. 1 and 3, the connection lever group 82 includes a first connection lever 821 and a second connection lever 822. An accommodating cavity 8211 is formed at one end of the first connecting rod 821 along the length direction thereof, and the other end of the first connecting rod 821 is connected with the support screw 7. One end of the second connecting rod 822 is placed in the accommodating cavity 8211 and is in sliding fit with the first connecting rod 821, and the other end of the second connecting rod 822 is fixedly connected with the slider 811. The accommodating cavity 8211 is internally provided with a second spring 823, one end of the second spring 823 is fixedly connected with the bottom wall of the accommodating cavity 8211, and the other end of the second spring 823 is fixedly connected with the end part of the second connecting rod 822. In order to prevent the relative rotation between the first connecting rod 821 and the second connecting rod 822, the first connecting rod 821 and the second connecting rod 822 are square rods.

Referring to fig. 3, the second connecting rod 822 has a connecting groove 8221 along a length direction thereof, the first connecting rod 821 has a limiting hole 8212, and the limiting hole 8212 is communicated with the accommodating cavity 8211. A limiting bolt 824 is connected to the limiting hole 8212 through a thread, and the end of the limiting bolt 824 extends into the connecting groove 8221.

Referring to fig. 3 and 4, the contact block 812 abuts against the side wall of the square-hole screen 3, the contact block 812 is located at the boundary position of the two square-hole screens 3, and the two limiting strips 814 on the contact block 812 are respectively inserted into the limiting grooves 31 of the upper and lower square-hole screens 3 to prevent the dislocation between the two square-hole screens 3.

Referring to fig. 1 and 3, at the in-process of vibration, square hole screen cloth 3 can take place rocking of all directions, and when taking place rocking in the vertical direction, slider 811 takes place to slide along vertical direction in contradicting piece 812, and second spring 823 cushions the power that square hole screen cloth 3 produced, has reduced the impact that support screw 7 connected with connecting rod group 82 received, has also reduced the impaired possibility of device when guaranteeing that square hole screen cloth 3 can fully vibrate.

Referring to fig. 1 and 3, when the interference assembly 81 receives a force in a left-right direction when the square-hole screen 3 shakes, the second connecting rod 822 slides in the accommodating cavity 8211 of the first connecting rod 821, and the second spring 823 reduces an impact force received by the first connecting rod 821 when the square-hole screen 3 shakes. In order to prevent the second connecting rod 822 from being removed from the receiving cavity 8211 during the sliding process, a limiting bolt 824 passes through the side wall of the first connecting rod 821 and extends into the connecting groove 8221 of the second connecting rod 822 to limit the sliding of the second connecting rod 822.

Referring to fig. 1 and 3, a mounting block 11 for connecting with the stabilizing mechanism 8 is connected to the supporting screw 7 through a thread, a first opening 111 through which a first connecting rod 821 passes is horizontally formed in the mounting block 11, a first positioning hole 112 is formed in a top wall of the mounting block 11, and a plurality of second positioning holes 8213 are formed in one end of the first connecting rod 821, which is far away from the slider 811, along a length direction of the one end.

Referring to fig. 1 and 3, a first connecting rod 821 is inserted into the first opening 111, and a position of the first connecting rod 821 in the first opening 111 is adjusted as required, so that the first positioning hole 112 corresponds to a suitable second positioning hole 8213, a positioning pin 12 for limiting is inserted into the first positioning hole 112 and the second positioning hole 8213, and the connection between the stabilizing mechanism 8 and the support screw 7 is realized through the cooperation of the mounting block 11 and the positioning pin 12.

Referring to fig. 4, the pressing assembly 9 includes a limiting block 91, a pressing plate 92, a pressing rod 93 and a third spring 94, one end of the pressing rod 93 is fixedly connected to the pressing plate 92, the other end of the pressing rod 93 is in threaded connection with the limiting block 91, and the third spring 94 is sleeved on the pressing rod 93.

Referring to fig. 4, the fixing assembly 10 includes a fastening frame 101 and a positioning nut 102. The tightening frame 101 comprises a tightening disc 1011 and a tightening rod 1012, a second opening 1013 is formed on the tightening disc 1011, three tightening rods 1012 are fixedly connected to the tightening disc 1011 at equal angular intervals by taking the center of circle of the tightening disc 1011 as the axis, a clamping circular hole 1014 for the positioning nut 102 to pass through is formed in one end of the tightening rod 1012, which is far away from the tightening disc 1011, a clamping groove 1015 communicated with the clamping circular hole 1014 is formed in the tightening rod 1012, and the tightening rod 1012 is made of an elastic material. The positioning nut 102 is cylindrical, a circle of butt-joint groove 1021 is formed in the outer side wall of the positioning nut 102, and the positioning nut 102 is in threaded connection with the support screw 7.

Referring to fig. 4, when the vibrating screen is performed, the pressing plate 92 abuts against the cover plate 4, the tightening frame 101 is sleeved on the pressing rod 93 through the second opening 1013, and the tightening rod 1012 is fastened on the fastening groove 1021 of the positioning nut 102 through the fastening groove 1015. One end of the third spring 94 abuts against the pressing plate 92, and the other end abuts against the abutting frame 101.

Referring to fig. 4, when the device is installed, the three positioning nuts 102 are adjusted to the proper positions of the supporting screws 7, so that the abutting frames 101 clamped on the positioning nuts 102 are pressed against the third springs 94, and the pressing plate 92 presses the cover plate 4 under the action of the third springs 94. When the device carries out the vibration and divides the sieve, compress tightly subassembly 9 and vibrate from top to bottom along with apron 4, third spring 94 makes pressure strip 92 can compress tightly apron 4 and square hole screen cloth 3 all the time with the setting of fixed subassembly 10, has reduced the possibility that apron 4 dropped from square hole screen cloth 3, has also reduced the impact force that supporting screw 7 received simultaneously, has prolonged the life of device.

The implementation principle of square hole grit screening instrument of the embodiment of this application is: when the square hole screen cloth 3 is installed, the square hole screen cloth 3 is sequentially stacked on the workbench 2, the installation block 11 is installed at a proper position on the support screw 7 according to the height of the square hole screen cloth 3, and the stabilizing mechanism 8 is connected with the installation block 11 according to the radius of the square hole screen cloth 3, so that the limiting strip 814 on the contact block 812 is in butt joint with the limiting groove 31 on the square hole screen cloth 3. The cover plate 4 is placed at the opening of the topmost square-hole screen 3 and the cover plate 4 is pressed by the pressing assembly 9.

When the device vibrates and the square hole screen 3 vibrates in the vertical direction, the sliding block 811 slides in the sliding groove 8121 of the abutting block 812 in the vertical direction, and the pressing component 9 moves up and down along with the cover plate 4 and always abuts against the cover plate 4; when the square-hole screen 3 vibrates in the horizontal direction, the second connecting rod 822 slides in the receiving cavity 8211 of the first connecting rod 821. The structural stability of the device is guaranteed on the premise that the square-hole screen 3 can normally vibrate, the impact force on the supporting screw 7 is reduced, and the service life of the device is prolonged.

The above embodiments are preferred embodiments of the present application, and the protection scope of the present application is not limited by the above embodiments, so: all equivalent changes made according to the structure, shape and principle of the present application shall be covered by the protection scope of the present application.

Claims (9)

1. The utility model provides a square hole grit screening instrument, includes mounting base (1), workstation (2), square hole screen cloth (3) and apron (4), be provided with vibrating motor (5) in mounting base (1), workstation (2) fixed connection is on mounting base (1), and is a plurality of square hole screen cloth (3) vertically pile up on workstation (2), apron (4) overlap joint is on the opening of the square hole screen cloth (3) on top, its characterized in that: including supporting screw (7) and stabilizing mean (8), it is a plurality of supporting screw (7) fixed connection is on workstation (2), stabilizing mean (8) are including connecting rod group (82) and conflict subassembly (81), connecting rod group (82) are including head rod (821), second connecting rod (822) and elastic component, the elastic component is passed through with the one end of second connecting rod (822) to the one end of head rod (821), the other end and the supporting screw (7) of head rod (821) are connected, the one end and the conflict subassembly (81) of head rod (821) are kept away from in second connecting rod (822) are connected, the lateral wall butt of one side and square hole screen cloth (3) that second connecting rod (822) were kept away from in conflict subassembly (81).

2. A square hole sand screening apparatus according to claim 1, wherein: conflict subassembly (81) include slider (811) and conflict piece (812), slider (811) and second connecting rod (822) fixed connection, it has seted up spout (8121) on conflict piece (812), spout (8121) and slider (811) sliding fit, the both ends of slider (811) all are provided with first spring (813), the axis direction of first spring (813) is parallel with the glide direction of slider (811), the one end of first spring (813) and the lateral wall fixed connection of slider (811), the other end of first spring (813) and the inside wall fixed connection of spout (8121), work as when the lateral wall butt of conflict subassembly (81) and square hole screen cloth (3), spout (8121) are vertical setting.

3. A square hole sand screening apparatus according to claim 1, wherein: the one end of head rod (821) is seted up and is used for holding chamber (8211) of second connecting rod (822), the one end of second connecting rod (822) is located and holds chamber (8211) and with head rod (821) sliding fit, be provided with second spring (823) in holding chamber (8211), the one end of second spring (823) and the diapire fixed connection who holds chamber (8211), the other end and second connecting rod (822) of second spring (823) are located and hold the one end fixed connection in chamber (8211).

4. A square hole sand screening apparatus according to claim 3, wherein: seted up connecting groove (8221) on second connecting rod (822), the direction that sets up of connecting groove (8221) is parallel with the length direction of second connecting rod (822), spacing hole (8212) have been seted up on first connecting rod (821), spacing hole (8212) and holding chamber (8211) intercommunication, threaded connection has spacing bolt (824) in spacing hole (8212), spacing bolt (824) pass first connecting rod (821) through spacing hole (8212) and stretch into in connecting groove (8221).

5. A square hole sand screening apparatus according to claim 1, wherein: the supporting screw rod (7) is provided with an installation block (11), the installation block (11) is in threaded fit with the supporting screw rod (7), a first opening (111) for a first connecting rod (821) to pass through is formed in the installation block (11), a first positioning hole (112) is formed in the installation block (11), the positioning hole is communicated with the first opening (111), and a plurality of second positioning holes (8213) are formed in the first connecting rod (821) along the length direction of the first connecting rod.

6. A square hole sand and stone screening apparatus according to claim 5, wherein: and positioning pins (12) are inserted into the first positioning holes (112) and the second positioning holes (8213).

7. A square hole sand screening apparatus according to claim 2, wherein: the upper surface of workstation (2) is seted up and is used for holding constant head tank (21) of square hole screen cloth (3), square hole screen cloth (3) are placed in constant head tank (21), be provided with rubber ring (6) between the inside wall of constant head tank (21) and square hole screen cloth (3).

8. A square hole sand screening apparatus according to claim 2, wherein: the cover plate (4) is provided with a fixing component (10) and a pressing component (9), the fixing component (10) comprises a pressing frame (101), the pressing frame (101) comprises a pressing disc (1011) and a pressing rod (1012), a second hole (1013) is formed in the pressing disc (1011), the pressing rods (1012) are connected to the pressing disc (1011) at equal angular intervals, the number of the pressing rods (1012) is consistent with that of the supporting screw rods (7), one end, far away from the pressing disc (1011), of each pressing rod (1012 is connected with the supporting screw rods (7), the pressing component (9) comprises a pressing plate (92), a pressing rod (93), a limiting block (91) and a third spring (94), the pressing plate (92) is fixedly connected with one end of the pressing rod (93), and the other end of the pressing rod (93) is detachably connected with the limiting block (91), the third spring (94) is sleeved on the compression rod (93), the abutting frame (101) is sleeved on the compression rod (93) through the second opening (1013), one end of the third spring (94) is abutted to the compression plate (92), and the other end of the third spring (94) is abutted to the abutting disc (1011).

9. A square hole sand and stone screening apparatus according to claim 7, wherein: fixedly connected with stopper (91) on the one side of conflict piece (812) and square hole screen cloth (3) contact, offer spacing groove (31) that correspond with stopper (91) position on the lateral wall of square hole screen cloth (3), when the lateral wall butt of conflict piece (812) and square hole screen cloth (3), stopper (91) are pegged graft in spacing groove (31).

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