Structural member of rising direct-reading water meter

Abstract

The utility model discloses a structural member of an ascending direct-reading water meter, which comprises a plastic outer cover, an inserting piece guide groove is arranged on the side face of the plastic outer cover, and lead sealing hole side walls are arranged on two sides of the inserting piece guide groove. The plastic outer cover is connected with a lead sealing inserting piece, the edge of the lead sealing inserting piece is provided with a lead sealing hole three-wall groove corresponding to the side wall of the lead sealing hole, and the lead sealing hole three-wall groove and the side wall of the lead sealing hole form the lead sealing hole. A plurality of clamping tables clamped with the water meter are arranged on the edge of the plastic outer cover; the plastic outer cover and the lead sealing inserting piece jointly define the lead sealing hole, complex sliding block forming is not needed, the target function is achieved through a simple structure, the plastic outer cover and the water meter are connected in a clamped mode through the clamping table, sealing and fixing are completed, and time-consuming and labor-consuming bolt connection is avoided; and the rotating friction resistance is reduced through the contact facet.

Description

Technical Field

[0001] The utility model relates to the technical field of photoelectric direct-reading water meter structural parts, in particular to a structural part of a rising direct-reading water meter. Background Art

[0002] The traditional small-diameter rotary vane water meters currently on the market have their movement sealed in the case by fastening the metal middle cover to the large thread of the water meter case. This method not only requires a special tightening device, but also usually requires manual pre-tightening, which is time-consuming and labor-intensive, and is not conducive to the automation transformation of the entire production line. The large thread connection method places higher requirements on thread processing. Slight differences often cause water meter seal leakage due to insufficient tightening; and the tightening of the thread makes the angular position of the metal middle cover uncontrollable. When angular positioning is required, such as non-magnetic sampling, optoelectronic communication line output, etc., additional components or structures must be added, which increases the complexity, cost and quality risks of the product.

[0003] For example, a "smart control water meter with a detachable combination mode" disclosed in a Chinese patent document, with the announcement number: CN111272248A, discloses a water meter with a data output interface that has been verified and sealed, an IoT smart control box, and a remote control meter front valve. The calibrated and sealed water meter with a data output interface can be used alone as an ordinary water meter without violating the Measurement Law. It can also be externally connected to the IoT smart device and the remote control meter front valve through the data output interface, so as to split and combine the metering function part, the IoT smart part, and the remote control part of the existing smart water meter. However, the sealing of the water meter in this solution still requires complex structures such as sliders and bolts. Summary of the invention

[0004] In order to solve the problems in the prior art of inconvenient lead sealing hole forming and complicated assembly and disassembly of the movement and the counter, the utility model provides a structural part of a rising direct-reading water meter, in which a lead sealing hole is formed by a plastic outer cover and a lead sealing insert, and no complicated slider molding is required; the plastic outer cover is assembled and fixed by a rotating hook, which greatly facilitates the installation and disassembly of the counter.

[0005] In order to achieve the above purpose, the utility model provides the following technical solutions:

[0006] A structural member of a rising direct-reading water meter includes: a plastic cover, a plug-in guide groove is provided on the side of the plastic cover, and lead-sealing hole side walls are provided on both sides of the plug-in guide groove; the plastic cover is connected to a lead-sealing plug-in, and a lead-sealing hole three-wall groove corresponding to the lead-sealing hole side wall is provided on the edge of the lead-sealing plug-in, and the lead-sealing hole three-wall groove and the lead-sealing hole side wall form a lead-sealing hole; and a plurality of clamping platforms are provided on the edge of the plastic cover to clamp with the water meter. The lead-sealing hole is formed by the outer edge surface of the plastic cover and the lead-sealing plug-in, and no complicated slider molding is required, and the target function is achieved with a simple structure; and the plastic cover is clamped with the water meter through the clamping platform to complete the installation and fixation.

[0007] Preferably, the lead seal insert is symmetrically arranged with external card slots on both sides, the opening of the external card slots faces the center of the lead seal insert, and the three-wall groove of the lead seal hole is located in the middle of the external card slots. The lead seal insert is fixed by the external card slots.

[0008] Preferably, a rotating frame hole is provided on the top of the plastic cover, the rotating frame hole is rotatably connected to a rotating frame, and the rotating frame is rotatably connected to a table cover. The rotating frame is used to realize the rotational installation of the table cover. The table cover is arranged on the plastic cover. The table cover can be rotated 360 degrees horizontally and flipped 180 degrees vertically.

[0009] Preferably, the rotating frame comprises a clamping column located at the bottom and a cover fixing part located at the top, and the clamping column and the cover fixing part are connected via a small contact surface, which reduces the rotation friction resistance.

[0010] Preferably, the cover fixing part is provided with a U-shaped hole, the cover is rotatably connected to the U-shaped hole, and the end of the clamping column away from the U-shaped hole is provided with a clamping column groove. The U-shaped hole is elastic, so that the cover can be elastically clamped into the U-shaped hole and rotated in the U-shaped hole.

[0011] Preferably, the lead seal insert is provided with guide ribs, the guide ribs correspond to the insert guide grooves, and the width of the guide ribs is the same as the width of the insert guide grooves. The guide ribs are used to realize the installation connection between the lead seal insert and the plastic outer cover.

[0012] Preferably, a wire hole is provided at the bottom of the lead seal insert, the wire hole is a fan-shaped opening, and the wire hole accommodates the communication wire of the water meter. The water meter communication wire is connected through the wire hole.

[0013] Preferably, the bottom end of the guide rib is located above the three-wall groove of the lead seal hole, and the top of the lead seal insert is provided with a top bevel, which abuts against the insert guide groove. The top bevel restricts the lead seal insert to a fixed position in the insert guide groove.

[0014] The utility model has the following advantages:

[0015] (1) The plastic cover and the lead seal insert together form a lead seal hole. There is no need for complicated slider molding. The target function can be achieved with a simple structure. The plastic cover is clamped to the water meter through a clamping table to complete the sealing and fixation, avoiding the time-consuming and labor-intensive bolt connection. (2) The rotational friction resistance is reduced by the small contact surface. (3) The rotation hook of the plastic cover is used and is restricted by the lead seal insert. The water meter counter can be easily loaded and unloaded and protected without complicated tools. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The drawings described below are merely exemplary. A person skilled in the art can derive other implementation drawings based on the provided drawings without inventive effort.

[0017] Figure 1 Schematic diagram of the structure of the plastic cover in the embodiment.

[0018] Figure 2 Schematic diagram of the structure of the rotating frame in the embodiment.

[0019] Figure 3 Schematic diagram of the structure of the lead seal insert in the embodiment.

[0020] Figure 4 It is a schematic diagram of the overall structure in the embodiment.

[0021] In the figure:

[0022] 3. External plastic parts; 3-1. Plastic cover; 3-1-1. Card base; 3-1-2. Hole of rotating frame; 3-1-3. Guide groove for insert; 3-1-4. Side wall of seal hole; 3-2. Cover; 3-3. Rotating frame; 3-3-1. Card post; 3-3-2. Small contact surface; 3-3-3. U-shaped hole; 3-4. Sealing insert; 3-4-1. Guide rib; 3-4-2. Three-wall groove of seal hole; 3-4-3. External card slot; 3-4-4. Wire hole. DETAILED DESCRIPTION

[0023] Based on the embodiments of the present utility model, all other embodiments obtained by ordinary technicians in the field without making any creative work shall fall within the scope of protection of the present utility model.

[0024] like Figure 1-4 As shown, in a preferred embodiment, the utility model discloses a structural member of a rising direct-reading water meter, including a lead seal insert 3-4, a plastic cover 3-1, a rotating frame 3-3 and a meter cover 3-2 connected in sequence. The plastic cover 3-1 includes a clamping platform 3-1-1 evenly distributed on the edge, and the top end surface of the plastic cover 3-1 is provided with a rotating frame hole 3-1-2, and the side surface is provided with a insert guide groove 3-1-3 and a lead seal hole side wall 3-1-4. A guide slope for easy insertion is provided at the starting end of the clamping platform 3-1-1.

[0025] The rotating frame 3-3 is provided with a clamping column 3-3-1 with a guide surface, and a contact surface 3-3-2 for reducing the rotational friction resistance is provided on the upper side of the clamping column 3-3-1, and a U-shaped hole 3-3-3 is connected above the contact surface 3-3-2, into which the axis of the cover 3-2 is elastically clamped.

[0026] The lead seal insert 3-4 is provided with guide ribs 3-4-1, external card slots 3-4-3 on both sides, the external card slots 3-4-3 are connected with three walls 3-4-2 of the lead seal hole, and a wire hole 3-4-4 at the bottom.

[0027] The plastic cover 3-1 and the lead seal insert 3-4 together form a lead seal hole, which does not require complicated slider molding and achieves the target function with a simple structure.

[0028] The plastic outer cover 3-1 is a cylindrical plastic part, and openings are provided at the top and bottom of the cylindrical plastic part. The opening at the top is smaller than the opening at the bottom. When in use, the plastic outer cover 3-1 is placed on the upper side of the water meter so that the opening at the bottom of the cylindrical plastic part abuts against the upper side of the water meter body.

[0029] An array of card platforms 3-1-1 are provided at the side edge of the bottom opening, and the card platforms 3-1-1 extend to the side of the plastic cover 3-1. The card platforms 3-1-1 include a U-shaped opening, and the side of the U-shaped opening is connected to the side of the cylindrical plastic part. The opening direction of the U-shaped opening faces upward and is parallel to the central axis of the cylindrical plastic part. A rotating frame hole 3-1-2 is provided at the edge of the top opening, and the rotating frame hole 3-1-2 opens upward.

[0030] The cross-sectional shape of the top opening is circular, a convex cover of a swing frame hole 3-1-2 is provided on the outer side of the top opening, the convex cover of the swing frame hole 3-1-2 is in the shape of an isosceles trapezoid, the swing frame hole 3-1-2 is located on the convex cover of the swing frame hole 3-1-2, and the swing frame hole 3-1-2 passes through the upper and lower end surfaces of the convex cover of the swing frame hole 3-1-2, and the cross-sectional shape of the swing frame hole 3-1-2 is circular.

[0031] In the rotating frame 3-3, the clamping column 3-3-1 is provided with a clamping column groove opening downward, the clamping column groove extends from the lower end of the rotating frame 3-3 to the center of the rotating frame, the center line of the clamping column groove coincides with the center line of the rotating frame 3-3, and the side of the clamping column groove passes through the two side surfaces of the rotating frame 3-3, connecting the left and right side surfaces of the rotating frame 3-3. The depth of the clamping column groove is less than half the length of the clamping column 3-3-1.

[0032] The clamping column 3-3-1 is provided with a square through hole, the width of the square through hole is the same as the width of the clamping column groove, the square through hole is located above the clamping column groove, the square through hole passes through the clamping column 3-3-1, and the square through hole connects the two side surfaces of the clamping column 3-3-1. The square through hole and the clamping column groove are respectively located on the upper and lower sides of the center point of the clamping column 3-3-1.

[0033] A circular arc protrusion is provided at the lower end of the clamping column 3-3-1. The circular arc protrusion is arranged around the lower end of the clamping column 3-3-1, and the circular arc protrusion is also penetrated by the clamping column groove.

[0034] The contact surface 3-3-2 is located at the upper end edge of the clamping column 3-3-1, and the contact surface 3-3-2 includes a circular protrusion structure with a diameter greater than the diameter of the clamping column 3-3-1.

[0035] The top of the clamping column 3-3-1 is provided with a cover fixing part of the clamping column 3-3-1, the U-shaped hole 3-3-3 is located at the front end face of the cover fixing part, the U-shaped hole 3-3-3 runs through both sides of the cover fixing part, and the opening of the U-shaped hole 3-3-3 faces the front of the cover fixing part. The clamping column 3-3-1 is fixedly arranged on the lower end face of the cover fixing part, the clamping column 3-3-1 is located at the center of the lower end face of the cover fixing part, and the diameter of the clamping column 3-3-1 is the same as the width of the cover fixing part. A rounded arc surface is provided on the rear side of the top of the cover fixing part, and the rounded arc surface is located on the side of the cover fixing part away from the opening of the U-shaped control hole. The bottom of the U-shaped hole 3-3-3 is provided with an arc bottom surface, the circular diameter of the arc bottom surface is greater than the distance between the two surfaces of the U-shaped hole 3-3-3, and the angle range of the arc bottom surface is greater than 120 degrees.

[0036] The guide rib 3-4-1 is located at the center of the lead seal insert 3-4, connected to the top of the lead seal insert 3-4, and extends downward along the center line of the lead seal insert 3-4 until the lower end of the guide rib 3-4-1 extends to the centroid of the lead seal insert 3-4. A central cavity is provided on the front side of the lead seal insert 3-4, the guide rib 3-4-1 is located in the central cavity, and extends upward from the bottom of the central cavity until the guide rib 3-4-1 is at the same height as the edge of the central cavity. The front end face of the guide rib 3-4-1 and the edge of the front end face of the lead seal insert 3-4 are located on the same surface.

[0037] When in use, the width of the guide rib 3-4-1 is the same as the width of the insert guide groove 3-1-3; the guide rib 3-4-1 is plugged and connected with the insert guide groove 3-1-3, so that the lead seal insert 3-4 is connected to the plastic cover 3-1, and under the limiting effect of the insert guide groove 3-1-3, the lead seal insert 3-4 is guided by the guide rib 3-4-1 to connect or separate with the plastic cover 3-1. When the guide rib 3-4-1 is guiding, the insert guide groove 3-1-3 follows the direction of the guide rib 3-4-1 and slides with the outer end surface of the guide rib 3-4-1. Until the top end of the guide rib 3-4-1 abuts against the upper end surface of the insert guide groove 3-1-3, the fixation of the lead seal insert 3-4 is completed.

[0038] In addition to opening forward and recessing the lead seal insert 3-4 backward, the central cavity is also open downward, so that the central cavity is surrounded by three sides except the bottom surface. The top ends of the left and right side walls of the central cavity are provided with extensions facing the inside of the central cavity, and the extensions are parallel to the bottom surface of the central cavity, and the extensions and the bottom of the central cavity form an external card slot 3-4-3.

[0039] In other embodiments, the outer card slot 3-4-3 is located on both sides of the lead seal insert 3-4, the opening direction of the outer card slot 3-4-3 is toward the center of the lead seal insert 3-4, and the bottom of the outer card slot 3-4-3 passes through the edge of the lead seal insert 3-4 and extends downward, so that its plug-in structure can enter the outer card slot 3-4-3 from the bottom. The lead seal hole three-wall groove 3-4-2 is provided at the edge of the front end face of the lead seal insert 3-4, and the cross-sectional shape of the lead seal hole three-wall groove 3-4-2 is U-shaped, the opening of the lead seal hole three-wall groove 3-4-2 is toward the front side of the lead seal insert 3-4, and the lead seal hole three-wall groove 3-4-2 extends to the inside of the edge of the lead seal insert 3-4. The lead seal hole three-wall groove 3-4-2 passes through the side wall of the central cavity and connects the inside of the central cavity and the outside of the lead seal insert 3-4. The lead seal hole three-wall groove 3-4-2 includes two located on the left and right side walls of the central cavity. The two lead-sealing hole three-wall grooves 3-4-2 are arranged symmetrically about the center of the central cavity, and the two lead-sealing hole three-wall grooves 3-4-2 are located at the same position on the left and right side walls of the central cavity.

[0040] When in use, the lead seal strip passes through the three-wall groove 3-4-2 of the lead seal hole and limits the lead seal strip.

[0041] A wire hole 3-4-4 is provided at the lower end of the bottom surface of the central cavity. The cross-sectional shape of the wire hole 3-4-4 is fan-shaped. The wire hole 3-4-4 accommodates the communication wire. The wire hole 3-4-4 passes through the bottom surface of the central cavity. The wire hole 3-4-4 connects the space between the bottom surface of the central cavity and the back surface of the central cavity. The fan-shaped center of the wire hole 3-4-4 is located on the center line of the central and western cavities. The diameter of the wire hole 3-4-4 is greater than the width of the guide rib 3-4-1.

[0042] The lead seal insert 3-4 is provided with a top bevel, and the extension direction of the top bevel is from the lower rear side to the upper front side of the lead seal insert 3-4. The space above the central cavity decreases as it approaches the top end. When in use, when the lead seal insert 3-4 enters from the top of the insert guide groove 3-1-3, when the guide rib 3-4-1 enters the insert guide groove 3-1-3 until the end of the guide rib 3-4-1 abuts against the insert guide groove 3-1-3, the upper end surface of the insert guide groove 3-1-3 abuts against the top bevel and is limited by the top bevel, thereby completing the fixation of the lead seal insert 3-4.

[0043] At this time, the lead seal insert 3-4 is limited by the guide rib 3-4-1 to prevent the lead seal insert 3-4 from moving to both sides. At the same time, it is limited by the top inclined surface to prevent the lead seal insert 3-4 from sliding downward. After the lead seal insert 3-4 is fixed, the three-wall groove 3-4-2 of the lead seal hole corresponds to the side wall 3-1-4 of the lead seal hole and is at the same height, so that the side wall 3-1-4 of the lead seal hole and the three-wall groove 3-4-2 of the lead seal hole form a lead seal hole. At this time, the lead seal strip is inserted into the lead seal hole. The lead seal strip enters from the three-wall groove 3-4-2 of the lead seal hole on one side of the central cavity, passes through the central cavity, and extends from the bottom of the guide rib 3-4-1 to the three-wall groove 3-4-2 of the lead seal hole on the other side of the central cavity, and finally passes through the three-wall groove 3-4-2 of the lead seal hole on the other side of the central cavity to complete the lead seal.

[0044] The plastic cover 3-1 is connected to the water meter cover 3-2, the plastic cover 3-1 is connected below the cover 3-2, the rotating bracket 3-3 and the lead seal insert 3-4 are respectively connected to the two sides of the plastic cover 3-1. The lead seal insert 3-4 is clamped with the plastic cover 3-1, the rotating bracket 3-3 is plugged with the plastic cover 3-1, and the rotating bracket 3-3 is connected to the cover 3-2.

[0045] The watch cover 3-2 is connected to the U-shaped hole 3-3-3 of the rotating frame 3-3. The edge of the watch cover 3-2 is provided with a clamping protrusion, and the end of the clamping protrusion is provided with a clamping circular shaft. The clamping protrusion is connected to the U-shaped hole 3-3-3, and the clamping circular shaft forms a rotational fit with the arc bottom surface in the U-shaped hole 3-3-3, so that the watch cover 3-2 can rotate with the clamping circular shaft as the rotation center under the limiting effect of the U-shaped hole 3-3-3, thereby realizing the opening and closing of the watch cover 3-2.

[0046] The edge diameter of the watch cover 3-2 is larger than the diameter of the top opening of the plastic cover 3-1, so that when the watch cover 3-2 is closed, the edge of the watch cover 3-2 abuts against the outer side of the top opening of the plastic cover 3-1, thereby preventing debris and dust from entering the interior of the plastic cover 3-1. A perspective hole is provided in the center of the watch cover 3-2, and the perspective hole is hollowed out in the center of the watch cover 3-2, and a sheet of glass or transparent material is provided at the perspective hole, so that the interior of the watch cover 3-2 can be observed from the perspective hole without opening the watch cover 3-2.

[0047] The water meter body is provided with a fixing seat, and the fixing seat is connected to the plastic outer cover 3-1. The plastic outer cover 3-1 is fixedly connected to the outer side of the fixing seat, and the fixing seat is connected to the plastic outer cover 3-1 by snapping. A limiting notch is provided at the edge of the fixing seat, and the limiting notch corresponds to the clamping platform 3-1-1 on the plastic outer cover 3-1. A communication line avoidance port is also provided at the edge of the fixing seat, and the communication line avoidance port corresponds to the wire hole 3-4-4 on the lead seal insert 3-4, and the communication line avoidance port and the wire hole 3-4-4 are combined into a circular hole-shaped structure for accommodating the communication line.

[0048] The edge of the fixing seat is also provided with a lead seal insert slot, and the lead seal insert slot is located on both sides of the communication line avoidance port, and the lead seal insert slot is arranged vertically to the communication line avoidance port. The lead seal insert slot is connected to the external slot 3-4-3. The lead seal insert slot and the external slot 3-4-3 are meshed with each other. When the guide rib 3-4-1 of the lead seal insert 3-4 enters the insert guide groove 3-1-3 on the plastic outer cover 3-1, the external slot 3-4-3 in the lead seal insert 3-4 enters the lead seal insert slot on the fixing seat, thereby realizing the connection of the lead seal insert 3-4 with the fixing seat and the plastic outer cover 3-1 at the same time, and realizing the fixation of the fixing seat and the plastic outer cover 3-1.

[0049] The limiting notch includes a protrusion toward the center of the fixing seat, and through cavities are provided on both sides of the protrusion toward the center of the fixing seat, and the protrusion moves in the through cavities. When the card table 3-1-1 passes through the through cavity and enters below the protrusion, the card table 3-1-1 cannot move in the upward and downward directions due to the limiting effect of the protrusion, thereby fixing the plastic cover 3-1. At this time, the communication line avoidance port corresponds to the insert guide groove 3-1-3 on the plastic cover 3-1. At this time, the lead seal insert 3-4 is installed in the insert guide groove 3-1-3, and the plastic cover 3-1 and the fixing seat are fixed in the circumferential direction through the lead seal insert 3-4.

[0050] During installation of the present solution, the rotating frame 3-3 and the clamping column 3-3-1 are inserted into the rotating frame hole 3-1-2 of the plastic outer cover 3-1, and it is confirmed that the contact surface 3-3-2 can be attached to the upper plane of the rotating frame hole 3-1-2, and then the rotating shaft of the cover 3-2 is clamped into the elastic U-shaped hole 3-3-3, thereby forming a plastic outer cover assembly.

[0051] The card table 3-1-1 is rotated and inserted into the limiting gap until the insert guide groove 3-1-3 is aligned with the seal insert slot, and the guide rib 3-4-1 of the seal insert 3-4 and the outer slot 3-4-3 are aligned and inserted into the insert guide groove 3-1-3 and the insert slot. Finally, the seal line passes through the seal hole and the seal rib hole formed by the three walls 3-4-2 of the seal hole and the side wall 3-1-4 of the seal hole, and the seal of the water meter is completed.

[0052] This solution is not only applicable to photoelectric, non-magnetic and other types of water meters, but can also be used for various electric meters, gas meters, temperature meters or similar meter shell structures having the above-mentioned structures.

[0053] These modifications or improvements made on the basis of the present utility model without departing from the spirit of the present utility model shall all fall within the scope of protection required by the present utility model.

Claims

1. A structural member of a rising direct-reading water meter, characterized in that: include: A plastic cover, a plug-in guide groove is arranged on the side of the plastic cover, and lead sealing hole side walls are arranged on both sides of the plug-in guide groove; the plastic cover is connected with a lead sealing plug, and a three-wall groove of the lead sealing hole corresponding to the side wall of the lead sealing hole is arranged on the edge of the lead sealing plug, and the three-wall groove of the lead sealing hole and the side wall of the lead sealing hole form a lead sealing hole; a plurality of clamping platforms connected with the water meter are arranged on the edge of the plastic cover.

2. The structural member of the rising level direct reading water meter according to claim 1, characterized in that: External card slots are symmetrically arranged on both sides of the lead sealing insert, the openings of the external card slots face the center of the lead sealing insert, and the three-wall groove of the lead sealing hole is located in the middle of the external card slots.

3. A structural member for a rising level direct reading water meter according to claim 1 or 2, characterized in that: A rotating frame hole is arranged on the top of the plastic outer cover, the rotating frame hole is rotatably connected with the rotating frame, and the rotating frame is rotatably connected with the watch cover.

4. The structural member of the rising level direct reading water meter according to claim 3, characterized in that: The rotating frame comprises a clamping column located at the bottom and a cover fixing part located at the top, and the clamping column and the cover fixing part are connected via a contact surface.

5. The structural member of the rising level direct reading water meter according to claim 4, characterized in that: The cover fixing portion is provided with a U-shaped hole, and the cover is rotatably connected to the U-shaped hole; the end of the clamping column away from the U-shaped hole is provided with a clamping column groove.

6. A structural member for a rising level direct reading water meter according to claim 1 or 2, characterized in that: The lead seal insert is provided with guide ribs, the guide ribs correspond to the insert guide grooves, and the width of the guide ribs is the same as the width of the insert guide grooves.

7. A structural member for a rising level direct reading water meter according to claim 1 or 2, characterized in that: A wire hole is arranged at the bottom of the lead seal insert, and the wire hole is a fan-shaped opening, and the wire hole accommodates the communication wire of the water meter.

8. The structural member of the rising level direct reading water meter according to claim 6, characterized in that: The bottom end of the guide rib is located above the three-wall groove of the lead seal hole, and the top of the lead seal insert is provided with a top inclined surface, which abuts against the insert guide groove.

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