CN212687877U

CN212687877U - Filter press with filter cloth left-right folding function

Info

Publication number: CN212687877U
Application number: CN202021828364.6U
Authority: CN
Inventors: 吕明旺
Original assignee: Taiwan Press Co ltd
Current assignee: Taiwan Press Co ltd
Priority date: 2020-08-27
Filing date: 2020-08-27
Publication date: 2021-03-12
Anticipated expiration: 2030-08-27

Abstract

A filter press with filter cloth left and right folding function is provided, wherein plate frames which are controlled to displace and overlap are arranged on a track of a frame, a sludge port is arranged at the upper section of each plate frame, high-quality sludge slurry is rapidly extruded downwards by using weight to fill each filter chamber, and the top sides of two adjacent filter cloths of each two plate frames are respectively and transversely connected with a left support rod and a right support rod so as to respectively form a left connecting rod group and a right connecting rod group; the plate frames extrude sludge slurry between two adjacent filter cloths to dehydrate into mud cakes, and then when the plate frames are sequentially pulled open by the filter press, the two left support rods of the left connecting rod group and the two right support rods of the right connecting rod group are linked to be opened, so that the left side and the right side of the corresponding filter cloth are respectively driven to be turned over and separated from the plate frames, and the dehydrated mud cakes are quickly pushed open and discharged.

Description

Filter press with filter cloth left-right folding function

Technical Field

The utility model relates to a pressure filter indicates a pressure filter with a function is rolled over about filter cloth especially.

Background

The known plate-and-frame sludge filter press is shown in fig. 1 to fig. 3, and is provided with a plate frame 91 and a pulling and feeding device 93 which are movably overlapped and leaned on the rails at the two sides of a frame 9, and are forcibly positioned by matching a fixed end seat 92 with a movable end seat 921. Sludge ports 911, drain holes 912 and filter cloth 94 are arranged on the filter chambers on both sides of each plate frame 91 to communicate the sludge slurry pipeline 97 and the sewage drainage pipeline 98 of the fixed end seat 92. The frame 9 is provided with a vibration frame 95 and a driver 951, and a plurality of sets of elastic hanging members 96 are slidably disposed on the guide rails 952 of the vibration frame 95 to respectively hang and connect the filter cloths 94.

When the plate frames 91 are driven by the sludge filter press to move and overlap, the sludge slurry is continuously fed and extruded by the pump, so that the sewage is discharged through the water discharge holes 912, and the sludge is wrapped in the filter chamber by the filter cloth 94, thereby achieving the purpose of extrusion dehydration. Then the sludge filter press clamps and pulls the plate frames 91 and the filter cloth 94 one by the pulling device 93, and the driver 951 drives the vibrating frame 95 and the elastic hanging piece 96 to pull and release the filter cloth 94 in a reciprocating manner, so as to drop the dewatered sludge cake 99.

The known sludge filter press adopts the front and rear oblique tension filter cloth 94, and each plate frame 91 can only be provided with a sludge port 911 at the lower section of the plate frame 91 in order to match the front and rear oblique tension mode of the filter cloth 94, which is not beneficial to the upward extrusion and filling of high-quality sludge slurry into a filter chamber, so that the rapid feeding and the extrusion of the sludge slurry cannot be realized, the feeding operation time is relatively increased, and the kinetic energy is more consumed. Therefore, how to solve the above-mentioned drawbacks and deficiencies of the conventional sludge filter press is a topic to be researched and developed by the related manufacturers.

SUMMERY OF THE UTILITY MODEL

The utility model discloses a main aim at, the mud mouth feeding of pressure filter use upper segment lets high quality sludge slurry utilize weight to down extrude rapidly and be full of each filter chamber, saves feeding operating time, and when the pressure filter is pulling open the sheet frame according to the preface and is unloaded, left connecting rod group and right connecting rod group between double-phase adjacent filter cloth are opened to the interlock, drive the left and right sides that corresponds the filter cloth simultaneously and turn over respectively and leave the sheet frame to unload the mud cake that has already dewatered rapidly.

The utility model discloses a further aim at, the pressure filter utilizes guide arm guide filter cloth and left connecting rod group and right connecting rod group to produce the vibration when pulling open the sheet frame according to the preface and unloading to unload the mud cake of dewatering more rapidly, the filter cloth need not use extra vibration to unload moreover and use power supply, reduce cost.

In order to achieve the purpose, the filter press with the filter cloth left-right folding function of the utility model is provided with a plurality of plate frames with controlled backward displacement overlapping on the left-right side relative rails of a frame, the frame is provided with left-right side relative guide rails above each plate frame, the front and the back of each plate frame are respectively provided with a rectangular filter chamber and filter cloth covering, two filter chambers of each plate frame are communicated with the upper section of the filter cloth and are connected with a sludge port, so as to extrude sludge slurry to dewater between two adjacent filter cloths of each two plate frames; the two track sides are respectively provided with a pulling mechanism, so that the plate frames and the filter cloth are pulled forwards to drop the dewatered mud cakes downwards; wherein: two supporting rods are respectively vertically arranged on the top of each plate frame corresponding to the middle of each filter cloth, and each supporting rod is sleeved with a spring; the top of each filter cloth is transversely connected with a left stay bar and a right stay bar, one end of each left stay bar and one end of each right stay bar are respectively pivoted on two supporting rods of the corresponding plate frame, and the springs prop up the left stay bars and the right stay bars; a left pivot joint piece is pivoted between the other ends of the two left stay bars of each two adjacent filter cloths to form a left connecting rod group, and a right pivot joint piece is pivoted between the other ends of the two right stay bars of each two adjacent filter cloths to form a right connecting rod group; guide rods are respectively arranged on the two guide rails corresponding to the space between each two adjacent plate frames in a sliding and spanning manner, two ends of each guide rod are respectively connected with a left spring and a right spring, the bottom end of each left spring is connected with the corresponding left connecting rod group, and the bottom end of each right spring is connected with the corresponding right connecting rod group; by the above, when the plate frames are overlapped and leaned against, the two left support rods of each left connecting rod group are arranged in parallel and close to each other, and the two right support rods of each right connecting rod group are arranged in parallel and close to each other; when the plate frame is pulled forward one by the pulling and feeding mechanism, the left connecting rod group and the right connecting rod group are pulled in a linkage manner to form relative included angles respectively, and the left connecting rod group and the right connecting rod group respectively stretch the left spring and the right spring, so that the left support rods and the right support rods drive the left side and the right side of the corresponding filter cloth to be respectively folded and separated from the plate frame, and the dewatered mud cakes are discharged.

In the filter press with the filter cloth left-right folding function, the two support rods of each plate frame correspond to the left side and the right side of the sludge opening, and each left support rod and each right support rod are provided with the pivot holes which are pivoted on the corresponding support rods.

In the filter press with the filter cloth left-right folding function, the other ends of the left support rod and the right support rod are provided with the pivot holes, each of the left pivot connecting piece and the right pivot connecting piece is an inverted U-shaped rod, two sides of the left pivot connecting piece and the right pivot connecting piece respectively penetrate through the corresponding pivot holes of the two left support rods and the two right support rods, and the top ends of the left pivot connecting piece and the right pivot connecting piece are respectively connected to the bottom ends of the left spring and the right spring.

In the filter press with the filter cloth left-right folding function, the two ends of each guide rod are respectively provided with the guide ring, and the two guide rails are respectively and fixedly provided with the steel cable which penetrates through and guides each corresponding guide ring.

In the filter press with the filter cloth left-right folding function, the two guide rails are respectively and oppositely pivoted with a plurality of guide arms arranged at intervals front and back below the guide rod, each guide arm is provided with a guide part extending downwards from the left stay bar and the right stay bar, and the guide rails are provided with limiting parts for preventing the guide parts from swinging forwards and upwards; when the plate frames are displaced and overlapped towards the back, the left stay bar and the right stay bar of the plate frames push the guide parts of the corresponding guide arms to swing towards the back upper part and move back; and when each sheet frame is pulled open forward in order, the left stay bar and the right stay bar of the sheet frame are abutted against the corresponding guide arm, so that the left stay bar and the right stay bar descend forward along the guide part and pass through the guide part, and then the left stay bar and the right stay bar are pulled to pop up through the restoring elasticity of the left spring and the right spring so as to drive the filter cloth to vibrate and unload the mud cakes.

In the filter press with the filter cloth left-right folding function, the other end of one left stay bar in each left connecting rod group is provided with a left rod part extending towards the left, and the other end of one right stay bar in each right connecting rod group is provided with a right rod part extending towards the right; when each sheet frame draws back forward in proper order, the sheet frame supports with left pole portion, right pole portion and leans on in corresponding guide arm, and descends forward along guide portion.

In the filter press having the filter cloth left-right folding function, the two guide rails are provided with a plurality of support shafts arranged at intervals in the front-rear direction, each guide arm is pivoted to the corresponding support shaft, and the rear edge of the guide portion of each guide arm is provided with the guide edge.

In the filter press with the filter cloth left-right folding function, the guide arms extend upwards to form the stopping portions, and the limiting members abut against the rear edges of the stopping portions to prevent the guide portions from swinging upwards and downwards.

Drawings

Fig. 1 is a schematic diagram of a known sludge filter press.

FIG. 2 is a sectional view of the plate frames of the sludge press filter of FIG. 1 for dewatering sludge slurry by press filtration.

Fig. 3 is a sectional view of the sludge filter press plate frame of fig. 2, followed by an opened state.

Fig. 4 is a structural diagram of the filter press of the present invention.

Figure 5 is the section view of the plate frames of the filter press for the filter press dehydration of sludge slurry.

Figure 6 is the perspective view that the filter press plate frame of the utility model is overlapped and leaned on.

Figure 7 is a perspective view of the filter press frame of figure 6 superimposed and leaned against, with front and rear filter cloths and left and right lugs removed.

Figure 8 is a perspective view of the filter press frame of figure 6 superimposed and leaned against, with each filter cloth and left and right lugs removed.

Figure 9 is an enlarged perspective view of a portion of each of the support rods, the left support rod and the right support rod of the filter press frame of figure 8.

Fig. 10 is a partially enlarged perspective view of the left and right linkage of the filter press of fig. 8.

Figure 11 is the action diagram of the plate frame of the filter press of the utility model which is overlapped and displaced backwards.

Fig. 12 is an action diagram (a) of the plate frame opening state of the filter press of the present invention.

Fig. 13 is a diagram (ii) showing the operation of the plate frame opening state of the filter press of the present invention.

Fig. 14 is an action diagram (three) of the plate frame opening state of the filter press of the present invention.

Fig. 15 is an action diagram (four) of the plate frame opening state of the filter press of the utility model.

Description of reference numerals:

the utility model discloses:

1. frame 3, filter cloth

11. Track 31, mud mouth

12. Fixed end seat 32 and drain hole

13. Movable end seat 4 and left connecting rod group

14. Oil hydraulic cylinder 41 and left stay bar

15. Fixing base 411 and pivot hole

16. Sludge pipeline 412 and pin joint hole

17. Sewage drainage pipeline 413 and left rod part

18. Pulling and conveying device 42, left pivoting member

181. Sprocket 421, thread portion

182. Chain 43, nut

2. Plate frame 5 and right connecting rod group

21. Filter chamber 51, right stay bar

211. Through hole 511, pivot hole

22. Sludge port 512 and pivot hole

23. Drain hole 513 and right rod part

24. Lug 52, right pivot connection

25. Strut 521, thread portion

26. Fixed plate 53, nut

27. Spring 6 and guide rail

61. Guide rod 67, limiting piece

62. Left spring 7, guide arm

63. Right spring 71, guide part

64. Guide ring 711, guide edge

65. Wire 72, stopper

66. Fulcrum shaft 8 and mud cake

The prior art is as follows:

9. frame 95, vibration frame

91. Plate frame 951, driver

911. Sludge opening 952, guide rail

912. Drainage hole 96, elasticity hanger

92. Fixed end seat 97 and sludge slurry pipeline

921. Movable end seat 98 and sewage draining pipeline

93. Pulling conveyer 99, mud cake

94. And (5) filtering the cloth.

Detailed Description

To achieve the above objects, the present invention provides a practical embodiment of the present invention, and the following description is provided with reference to the accompanying drawings:

first, referring to fig. 4 to 10, it can be clearly seen from the drawings that the main structure and principle of the filter press of the present invention are substantially the same as those of the prior art, the filter press is substantially a rectangular machine body, as shown in fig. 4 to 7, the left and right sides of the frame 1 are respectively provided with a pulling and conveying mechanism consisting of a pulling and conveying device 18, a chain wheel 181, and a chain 182, and a plurality of controlled plate frames 2 which are moved and overlapped backward (left side in fig. 4) are spanned on the two rails 11, so that the plate frames 2 are abutted against the fixed end base 12, and the hydraulic cylinder 14 of the fixed base 15 drives the movable end base 13 to be forcibly positioned. The frame 1 is provided with a left and right side opposite guide rail 6 above each plate frame 2, two sides of each plate frame 2 are provided with lugs 24 which straddle the rail 11, the front and back of each plate frame 2 are respectively covered with filter cloth 3, the front and back of each plate frame 2 are respectively concavely provided with a rectangular filter chamber 21, each plate frame 2 is provided with a communicating sludge port 22 at the upper section of the two filter chambers 21, the front and back opposite filter cloth 3 of each plate frame 2 are connected with a sludge port 31 correspondingly formed, so as to communicate with a sludge slurry pipeline 16 of the fixed end seat 12, the filter cloth 3 is provided with a plurality of drain holes 32 at corner positions, each plate frame 2 is provided with a plurality of drain holes 23 at corner positions oppositely, and the filter chamber 21 is provided with a through hole 211 communicated with the drain holes 23, so as to communicate with the.

When the filter press drives all the plate frames 2 to overlap and press the sludge slurry, the pump is used to continuously feed and extrude the sludge slurry, so that the sewage is discharged out through the drainage holes 23 and 32 and the sewage discharge pipeline 17, and the sludge is wrapped by the filter cloth 3 in the filter chamber 21 to be extruded and dehydrated into a sludge cake 7 (refer to fig. 5). Then the filter press opens the movable end seat 13 by the hydraulic cylinder 14, and drives the pulling device 18 to move back and forth, so as to sequentially pull the plate frames 2 and the filter cloth 3 forward (as shown in the right side of figure 4) one by one, and to drop the dewatered mud cake 7.

Referring to fig. 4 to 10 again, the filter press of the present invention is mainly characterized in that:

two supporting rods 25 are vertically arranged on the top of each plate frame 2 corresponding to the middle of each filter cloth 3 at intervals, a spring 27 is sleeved on each supporting rod 25, the front and rear supporting rods 25 of each plate frame 2 correspond to the left and right sides of the sludge opening 22, and the bottom end of each supporting rod 25 is connected with a fixing plate 26 (refer to fig. 8 and 9).

The top of each filter cloth 3 is transversely connected with a left stay bar 41 and a right stay bar 51 at intervals, one end of each left stay bar 41 and one end of each right stay bar 51 are provided with pivoting holes 411 and 511 (refer to fig. 9), the left stay bar 41 and the right stay bar 51 are respectively pivoted on the two support rods 25 of the corresponding plate frame 2 in the radial direction from the bottom to the top, and the springs 27 are upwards propped against the left stay bar 41 and the right stay bar 51; the other ends of the two left stay bars 41 of each two adjacent filter cloths 3 are pivoted with a left pivot joint 42 to form a left linkage 4, and the other ends of the two right stay bars 51 of each two adjacent filter cloths 3 are pivoted with a right pivot joint 52 to form a right linkage 5. Referring to fig. 8 and 10, the other ends of the left stay 41 and the right stay 51 are respectively provided with

pivot holes

412 and 512, the left pivot member 42 and the right pivot member 52 are respectively n-shaped, and the two sides of the left pivot member 42 and the right pivot member 52 are respectively provided with

screw thread portions

421 and 521 for respectively passing through and pivoting the radial corresponding pivot holes 412 and 512 of the left stay 41 and the right stay 51. Furthermore, the other end of one of the left stays 41 of each left linkage 4 may have a left rod portion 413 extending leftward, and the other end of one of the right stays 51 of each right linkage 5 may have a right rod portion 513 extending rightward.

The two guide rails 6 (see fig. 4 and 5) are respectively provided with guide rods 61 corresponding to the space between each two adjacent plate frames 2 in a sliding manner, two ends of each guide rod 61 are respectively provided with a guide ring 64 (see fig. 10), and the two guide rails 6 are respectively fixedly provided with a steel cable 65 penetrating and guiding each corresponding guide ring 64 in a front-back manner so as to guide each guide rod 61 to move back and forth. The lower portions of the two ends of each guide rod 61 are respectively connected with a left spring 62 and a right spring 63, the bottom end of each left spring 62 is connected to the top end of the lower opposite left pivoting member 42, and the bottom end of each right spring 63 is connected to the top end of the lower opposite right pivoting member 52. Furthermore, a plurality of guide arms 7 arranged at intervals in the front-rear direction are pivoted to the guide rails 6 below the guide rods 61, each guide arm 7 is pivoted to the corresponding support shaft 66 of the guide rail 6 through a through hole, the guide arm 7 is provided with a guide portion 71 extending downward from the left stay 41 and the right stay 51, the rear edge of the guide portion 71 is provided with a guide edge 711, the guide arm 7 extends upward to form a stop portion 72, the guide rail 6 is provided with a limiting member 67 preventing the guide portion 71 from swinging forward and upward, and the limiting member 67 is abutted against the rear edge of the stop portion 72.

When the filter press of the present invention drives and controls each plate frame 2 to move backward (left in fig. 4, 5 and 11) and overlap, the left rod portion 413 of the left stay 41 and the right rod portion 513 of the right stay 51 of the plate frame 2 push the guide portion 71 of the corresponding guide arm 7 to swing backward and upward (see fig. 11) to let the plate frame 2 pass backward, then, the plate frames 2 are overlapped and lean against, as shown in fig. 4 to 7, the plate frames 2 are fed by using the

sludge ports

22 and 31 at the upper section, so that the high-quality sludge slurry is rapidly extruded downwards by utilizing the weight to fill the filter chambers 21, the feeding operation time is saved, then when sludge slurry is extruded and dewatered between two adjacent filter cloth 3 of each two plate frames 2, two left support rods 41 of each left connecting rod group 4 are arranged in parallel and close to each other, and the two right stays 51 of each right linkage 5 are arranged in parallel and closely, and the filter press continuously presses the sludge slurry to dehydrate into a sludge cake 8 (see fig. 5).

After the filter press continuously extrudes sludge slurry to dehydrate into mud cakes 8, the plate frame 2 is pulled forward (as shown in the right side of fig. 4) one by using the pulling and feeding device 18 of the pulling and feeding mechanism, as shown in fig. 12 to 15, the plate frame 2 moves while the left connecting rod group 4 and the right connecting rod group 5 are pulled and pulled in a linkage manner to form relative included angles respectively, and the pulling and moving guide rod 61 is pulled and moved forward, the left pivot connecting piece 42 and the right pivot connecting piece 52 of the left connecting rod group 4 and the right connecting rod group 5 respectively stretch the left spring 62 and the right spring 63, so that the left support rod 41 and the right support rod 51 drive the left side and the right side of the corresponding filter cloth 3 to be respectively folded and separated from the plate frame 2 and the filter chamber 21, and the dehydrated mud cakes 8. In the process of sequentially opening the plate frames 2 forward, the left rod 413 of the left stay 41 and the right rod 513 of the right stay 51 of the plate frame 2 are pressed against the corresponding guide arm 7 forward, and the guide arm 7 is positioned by the limiting member 67, so that the left rod 413 of the left stay 41 and the right rod 513 of the right stay 51 descend forward along the guide edge 711 of the guide portion 71 and pass through the guide arm, and the left stay 41 and the right stay 51 are pulled to pop up by the restoring elasticity of the left spring 62 and the right spring 63, so as to drive the filter cloth 3 to vibrate and rapidly discharge the mud cakes 8. And the filter cloth 3 does not need to use an additional power source for vibration discharging, so that the cost can be reduced.

The above-described embodiments are merely illustrative, and not restrictive, and various changes and modifications may be made by those skilled in the art without departing from the spirit and scope of the invention, which is defined in the appended claims.

Claims

1. A filter press with the function of folding filter cloth left and right is provided with a plurality of plate frames which are controlled to move backwards and overlapped on opposite tracks on the left side and the right side of a frame, the frame is provided with a left side and a right side opposite guide rails above each plate frame, a rectangular filter chamber and the filter cloth are respectively arranged in front of and behind each plate frame, two filter chambers of each plate frame are communicated with the upper section of the filter cloth and are connected with a sludge port, so that sludge slurry is extruded between two adjacent filter cloths of each two plate frames for dehydration; the two track sides are respectively provided with a pulling mechanism, so that the plate frames and the filter cloth are pulled forwards to drop the dewatered mud cakes downwards; the method is characterized in that:

two supporting rods are respectively vertically arranged on the top of each plate frame corresponding to the middle of each filter cloth, and each supporting rod is sleeved with a spring;

the top of each filter cloth is transversely connected with a left stay bar and a right stay bar, one end of each left stay bar and one end of each right stay bar are respectively pivoted on two supporting rods of the corresponding plate frame, and the springs prop up the left stay bars and the right stay bars; a left pivot joint piece is pivoted between the other ends of the two left stay bars of each two adjacent filter cloths to form a left connecting rod group, and a right pivot joint piece is pivoted between the other ends of the two right stay bars of each two adjacent filter cloths to form a right connecting rod group;

guide rods are respectively arranged on the two guide rails corresponding to the space between each two adjacent plate frames in a sliding and spanning manner, two ends of each guide rod are respectively connected with a left spring and a right spring, the bottom end of each left spring is connected with the corresponding left connecting rod group, and the bottom end of each right spring is connected with the corresponding right connecting rod group;

when the plate frames are overlapped and lean against each other, the two left support rods of each left connecting rod group are arranged in parallel and close to each other, and the two right support rods of each right connecting rod group are arranged in parallel and close to each other; when the plate frame is pulled forward one by the pulling and feeding mechanism, the left connecting rod group and the right connecting rod group are pulled in a linkage manner to form relative included angles respectively, and the left connecting rod group and the right connecting rod group respectively stretch the left spring and the right spring, so that the left support rods and the right support rods drive the left side and the right side of the corresponding filter cloth to be respectively folded and separated from the plate frame, and the dewatered mud cakes are discharged.

2. The filter press with the left-right filter cloth folding function according to claim 1, wherein the two support rods of each plate frame correspond to the left and right sides of the sludge opening, and each of the left support rod and the right support rod is provided with a pivot hole to pivot on the corresponding support rod.

3. The filter press having the left and right filter cloth folding function as claimed in claim 1, wherein the left and right support rods have pivot holes at the other ends thereof, each of the left and right pivot members is a U-shaped rod, and the left and right pivot members are pivoted downwardly at both sides thereof to the corresponding pivot holes of the left and right support rods, respectively, and are connected to the bottom ends of the left and right springs by the top ends thereof.

4. The filter press with the filter cloth left-right folding function as claimed in claim 1, wherein the guide rods are provided with guide rings at both ends, and the guide rails are provided with cables respectively penetrating and guiding the corresponding guide rings.

5. The filter press with the function of folding filter cloth leftwards and rightwards as claimed in claim 1, wherein the two guide rails are respectively pivoted with a plurality of guide arms arranged at intervals forwards and backwards below the guide rod, the guide arms are provided with guide parts extending downwards from the left stay bar and the right stay bar, and the guide rails are provided with limiting parts for preventing the guide parts from swinging forwards and upwards; when the plate frames are displaced and overlapped towards the back, the left stay bar and the right stay bar of the plate frames push the guide parts of the corresponding guide arms to swing towards the back upper part and move back; and when each sheet frame is pulled open forward in order, the left stay bar and the right stay bar of the sheet frame are abutted against the corresponding guide arm, so that the left stay bar and the right stay bar descend forward along the guide part and pass through the guide part, and then the left stay bar and the right stay bar are pulled to pop up through the restoring elasticity of the left spring and the right spring so as to drive the filter cloth to vibrate and unload the mud cakes.

6. The filter press having the function of turning the filter cloth left and right according to claim 5, wherein one of the left struts of each left linkage has a left rod portion extending to the left at the other end thereof, and one of the right struts of each right linkage has a right rod portion extending to the right at the other end thereof; when each sheet frame draws back forward in proper order, the sheet frame supports with left pole portion, right pole portion and leans on in corresponding guide arm, and descends forward along guide portion.

7. A filter press having a filter cloth side-to-side folding function according to claim 5, wherein the guide rails are provided with a plurality of support shafts arranged at intervals in the front-to-rear direction, each guide arm is pivotally connected to the corresponding support shaft, and a guide edge is provided at a rear edge of a guide portion of each guide arm.

8. The filter press having the function of turning filter cloth right and left according to claim 7, wherein each of the guide arms extends upward to form a stopper, and the restricting member abuts against a rear edge of the stopper to prevent the guide portion from swinging upward and forward.