CN215947121U

CN215947121U - Glass fiber drawing equipment

Info

Publication number: CN215947121U
Application number: CN202122748423.XU
Authority: CN
Inventors: 丁明瑞
Original assignee: Hebei Ruichang Fiberglass Products Co ltd
Current assignee: Hebei Ruichang Fiberglass Products Co ltd
Priority date: 2021-11-11
Filing date: 2021-11-11
Publication date: 2022-03-04
Anticipated expiration: 2031-11-11

Abstract

The utility model discloses glass fiber drawing equipment which comprises a support frame, a smelting furnace, a feeding hole, a connecting pipe, a positioning assembly, a wire drawing bushing plate, a cooling piece and a wire drawing assembly, wherein the smelting furnace is arranged on the support frame, the feeding hole is arranged on the smelting furnace, the connecting pipe is arranged below the smelting furnace and connected to the smelting furnace, the positioning assembly is arranged at the upper end in the support frame, the wire drawing bushing plate is detachably arranged in the positioning assembly and below the connecting pipe, the cooling piece is connected to the support frame and arranged below the positioning assembly, and the wire drawing assembly is arranged at the lower end in the support frame and arranged below the cooling piece. The utility model belongs to the technical field of glass fiber production and processing, and particularly relates to glass fiber drawing equipment.

Description

Glass fiber drawing equipment

Technical Field

The utility model belongs to the technical field of glass fiber production and processing, and particularly relates to glass fiber drawing equipment.

Background

Glass fiber (original English name: glass fiber) is an inorganic non-metallic material with excellent performance, and has the advantages of good insulativity, strong heat resistance, good corrosion resistance and high mechanical strength, but has the defects of brittleness and poor wear resistance. The hair-care fiber is made of seven kinds of ores of pyrophyllite, quartz sand, limestone, dolomite, borocalcite and boromagnesite through the processes of high-temperature melting, wire drawing, winding, weaving and the like, wherein the diameter of each monofilament ranges from several micrometers to twenty micrometers, the monofilament is equivalent to 1/20-1/5 of one hair, and each bundle of fiber precursor consists of hundreds of even thousands of monofilaments. Glass fiber is usually used as reinforcing material in the combined material, electrical insulation material and adiabatic insulation material, each field of national economy such as circuit substrate, the present wire drawing machine that is used for producing glass fiber cloth generally carries out the melting wire drawing through the melting furnace, then spill glass liquid from the bushing, because the temperature is higher, the bushing is out of shape easily after long-time use, then come the cooling plate that is used for protecting the bushing who installs additional because the mounted position can not guarantee the accuracy, the water pipe in the cooling plate and the hole of bushing can not fine correspond, installation and debugging are all relatively troublesome, lead to production efficiency ratio lower.

SUMMERY OF THE UTILITY MODEL

In order to solve the problems, the utility model provides glass fiber drawing equipment which is convenient for rapidly replacing and protecting a wire drawing bushing plate by matching a positioning assembly with a cooling piece, and is convenient for rapidly and uniformly winding glass fibers by utilizing the wire drawing assembly so as to improve the drawing efficiency of the equipment.

In order to realize the functions, the technical scheme adopted by the utility model is as follows: a glass fiber drawing device comprises a support frame, a smelting furnace, a feed inlet, a connecting pipe, a positioning assembly, a drawing bushing plate, a cooling piece and a drawing assembly, wherein the smelting furnace is arranged on the support frame, the feed inlet is arranged on the smelting furnace, the connecting pipe is arranged below the smelting furnace and connected to the smelting furnace, the positioning assembly is arranged at the upper end in the support frame, the drawing bushing plate is detachably arranged in the positioning assembly and below the connecting pipe, the cooling piece is connected to the support frame and arranged below the positioning assembly, and the drawing assembly is arranged at the lower end in the support frame and arranged below the cooling piece; the positioning component comprises a support plate, through grooves, a slide rail, a slide block, a connecting rod, a positioning plate, a driving motor, an axle seat, a bidirectional screw rod, a screw rod pair and a connecting block, wherein the support plate is symmetrically arranged at the upper end in the support frame, the through grooves are symmetrically arranged on the support plate, the slide rail is symmetrically arranged below the upper wall of the support frame, the slide block is movably arranged on the slide rail, the connecting rod is arranged below the slide block, the positioning plate is arranged below the connecting rod and between the support plates, the wire drawing bushing plate is arranged between the positioning plates, the driving motor is symmetrically arranged on the side surface of the support plate away from the positioning plate, the axle seat is symmetrically arranged on the side surface of the support plate away from the driving motor, one end of the bidirectional screw rod is connected to the output end of the driving motor, the other end of the bidirectional screw rod pair is arranged in the axle seat, the screw rod pair is symmetrically sleeved on the bidirectional screw rod, one end of the connecting block is connected to the positioning plate, and the other end of the connecting block is movably penetrated through the through grooves and connected to the screw rod pair, when the wire drawing bushing needs to be replaced, the driving motor is connected with an external power supply, as known in the prior art, a screw rod converts rotary motion into linear motion in the working process, the driving motor is started, the driving motor drives the bidirectional screw rod to rotate, the bidirectional screw rod drives the screw rod pair to move back to back, the wire drawing bushing is loosened, so that the wire drawing bushing is detached from the connecting pipe and is convenient to replace, when the wire drawing bushing needs to be installed, two ends of the wire drawing bushing are placed in the positioning plates on two sides, the driving motor is started again, the driving motor drives the bidirectional screw rod to rotate, the bidirectional screw rod drives the screw rod pair to move in opposite directions, the screw rod pair drives the positioning plates to move in opposite directions, the positioning plates just prop the wire drawing bushing between the positioning plates in the opposite directions, and in addition, the positioning plates realize height limitation on the positioning plates while the movement of the positioning plates is not influenced by the arrangement of the connecting rod, the sliding rail and the sliding block in the opposite directions, make the height behind the mounting panel of wire drawing bushing just be in the connecting pipe below, through locating component's setting, after the wire drawing bushing warp, can carry out the dismouting change fast high efficiently to guarantee the play silk effect of silk leaking, thereby guarantee wire drawing equipment's wire drawing efficiency.

Wherein, the wire drawing component comprises a fixed rod, a wire collecting pipe, a telescopic cylinder, a telescopic rod, a motor for rotation and a winding rod, the fixed rod is connected with the support frame and arranged below the cooling part, the wire collecting pipe is arranged on the fixed rod, the telescopic cylinder is arranged at the lower end of the side surface of the support frame and arranged below the fixed rod, the telescopic rod is arranged at the lower end of the side surface of the support frame far away from the telescopic cylinder and arranged below the fixed rod, the motor for rotation is arranged at the telescopic end of the telescopic cylinder, one end of the winding rod is connected with the output end of the motor for rotation and the other end is connected with the telescopic rod, the silk threads are wound on the winding rod after passing through the wire collecting pipe in the wire drawing process, the motor for rotation is connected with an external power supply, the motor for rotation is started, the winding rod is driven by the motor for rotation, the glass wires are drawn, the winding cylinder is connected with the external power supply, the telescopic cylinder is simultaneously started in the winding process, the telescoping cylinder drives the rotation to move with motor and winding rod, makes the glass silk by the rolling uniformly to the winding rod on, through the setting of wire drawing subassembly, makes the glass silk by high-efficient even rolling to the winding rod to wire drawing and wire winding efficiency have been improved.

Further, the cooling piece includes hydraulic press, cooling chamber, cooling tube, air conditioner and gas outlet, the hydraulic press symmetry is located on the inside wall of support frame, the flexible of hydraulic press is served to the cooling chamber is located, cooling tube one end is located under the wire drawing bushing and the other end runs through the cooling chamber and is located under the cooling chamber, the air conditioner is connected in the cooling chamber, the gas outlet evenly is located on the upper wall and the lower wall of cooling chamber, at the in-process of wire drawing, links to each other air conditioner external power supply, starts the air conditioner, and air conditioning gets into in the cooling chamber, again through the even blowout of gas outlet, cools down to the glass silk on the one hand, and on the other hand cools down the wire drawing bushing, prevents that the wire drawing bushing temperature is too high and warp, in addition through the setting of hydraulic press, is convenient for removing the cooling piece, provides the activity space for the change of wire drawing bushing.

Wherein, evenly be equipped with the base under the support frame, the area of contact of increase support frame and ground for whole equipment is more stable.

Preferably, the positioning plate and the supporting plate are of radiating fin structures, so that heat on the wire drawing bushing plate can be conducted out in time, and the cooling of the wire drawing bushing plate is facilitated.

Furthermore, the positioning plate is of a U-shaped structure, the width of an opening of the positioning plate is equal to the thickness of the wire drawing bushing plate, and the wire drawing bushing plate is just positioned below the connecting pipe after being fixed by the positioning plate so as to prevent the molten glass from leaking laterally.

The utility model adopts the structure to obtain the following beneficial effects: the glass fiber drawing equipment of the scheme has the advantages that due to the arrangement of the positioning assembly, after the drawing bushing plate deforms, the glass fiber drawing equipment can be quickly and efficiently disassembled and replaced, so that the wire outlet effect of the bushing wire is ensured, the wire drawing efficiency of the drawing equipment is ensured, the glass fiber is efficiently and uniformly wound on the winding rod by utilizing the arrangement of the drawing assembly, the wire drawing and winding efficiency is improved, on one hand, the glass fiber is cooled, on the other hand, the drawing bushing plate is cooled, the deformation of the drawing bushing plate due to overhigh temperature is prevented, on the other hand, the cooling piece is convenient to move by utilizing the arrangement of the hydraulic machine, a moving space is provided for the replacement of the drawing bushing plate, due to the fact that the base is uniformly arranged below the supporting frame, the contact area between the supporting frame and the ground is increased, the whole equipment is more stable, the positioning plate and the supporting plate are of the radiating fin structure, the heat on the drawing bushing plate can be conveniently conducted out in time, do benefit to the cooling of wire drawing bushing, set up for U type structure through the locating plate to locating plate open-ended width equals the thickness of wire drawing bushing, makes the wire drawing bushing just be in the connecting pipe below after being fixed by the locating plate, in order to prevent the glass liquid side leakage.

Drawings

FIG. 1 is a schematic overall structure view of a front view of a glass fiber drawing apparatus according to the present embodiment;

FIG. 2 is an enlarged view taken at A in FIG. 1;

fig. 3 is a top view of the screw pair, the connecting block and the positioning plate in the glass fiber drawing device of the present scheme.

The device comprises a support frame 1, a support frame 2, a smelting furnace 3, a feeding port 4, a connecting pipe 5, a positioning assembly 6, a wire drawing bushing plate 7, a cooling piece 8, a wire drawing assembly 9, a support plate 10, a through groove 11, a sliding rail 12, a sliding block 13, a connecting rod 14, a positioning plate 15, a driving motor 16, a shaft seat 17, a bidirectional screw rod 18, a screw rod pair 19, a connecting block 20, a fixing rod 21, a wire collecting pipe 22, a telescopic cylinder 23, a telescopic rod 24, a rotating motor 25, a winding rod 26, a hydraulic machine 27, a cooling chamber 28, a cooling pipe 29, an air cooler 30, an air outlet 31 and a base.

Detailed Description

The technical solutions of the present invention will be described clearly and completely with reference to the accompanying drawings, and it should be understood that the described embodiments are some, but not all embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance. The present invention will be described in further detail with reference to the accompanying drawings.

As shown in fig. 1, fig. 2 and fig. 3, the glass fiber drawing device of this scheme, including support frame 1, smelting pot 2, feed inlet 3, connecting pipe 4, locating component 5, wire drawing bushing 6, cooling piece 7 and wire drawing subassembly 8, smelting pot 2 is located on support frame 1, feed inlet 3 is located on smelting pot 2, connecting pipe 4 is located under smelting pot 2 and is connected in smelting pot 2, locating component 5 locates the support frame 1 in the upper end, wire drawing bushing 6 can be dismantled and locate in locating component 5 and under connecting pipe 4, cooling piece 7 is connected in support frame 1 and is located under locating component 5, wire drawing subassembly 8 locates the support frame 1 in the lower extreme and locates cooling piece 7 below.

As shown in fig. 1, fig. 2 and fig. 3, the positioning assembly 5 includes a supporting plate 9, a through slot 10, a sliding rail 11, a sliding block 12, a connecting rod 13, a positioning plate 14, a driving motor 15, a shaft seat 16, a bidirectional screw 17, a screw pair 18 and a connecting block 19, the supporting plate 9 is symmetrically arranged at the upper end in the supporting frame 1, the through slot 10 is symmetrically arranged on the supporting plate 9, the sliding rail 11 is symmetrically arranged below the upper wall of the supporting frame 1, the sliding block 12 is movably arranged on the sliding rail 11, the connecting rod 13 is arranged below the sliding block 12, the positioning plate 14 is arranged below the connecting rod 13 and between the supporting plates 9, the wire drawing bushing plate 6 is arranged between the positioning plates 14, the driving motor 15 is symmetrically arranged on the side surface of the supporting plate 9 away from the positioning plate 14, the shaft seat 16 is symmetrically arranged on the side surface of the supporting plate 9 away from the driving motor 15, one end of the bidirectional screw 17 is connected to the output end of the driving motor 15 and the other end is arranged in the shaft seat 16, the screw pair 18 is symmetrically sleeved on the bidirectional screw 17, one end of the connecting block 19 is connected to the positioning plates 14, the other end of the connecting block is movably connected to the lead screw pair 18 through the through groove 10, when the wire drawing bushing 6 needs to be replaced, the driving motor 15 is connected with an external power supply, as is known in the prior art, the rotary motion of the lead screw is converted into linear motion in the working process, the driving motor 15 is started, the driving motor 15 drives the bidirectional lead screw 17 to rotate, the bidirectional lead screw 17 drives the lead screw pair 18 to move back and forth, the wire drawing bushing 6 is released from the connecting pipe 4 and is convenient to replace, when the wire drawing bushing 6 needs to be installed, two ends of the wire drawing bushing 6 are placed in the positioning plates 14 on two sides, the driving motor 15 is started again, the driving motor 15 drives the bidirectional lead screw 17 to rotate, the bidirectional lead screw 17 drives the lead screw pair 18 to move towards each other, the lead screw pair 18 drives the positioning plates 14 to move towards each other, the positioning plates 14 just push the wire drawing bushing 6 between the positioning plates 14 in the process of moving towards each other, in addition, in the process of opposite movement of the positioning plate 14, because the connecting rod 13, the sliding rail 11 and the sliding block 12 are arranged to realize height limitation on the positioning plate 14 while the movement of the positioning plate 14 is not influenced, the height of the wire drawing bushing 6 behind the mounting plate is just below the connecting pipe 4, and through the arrangement of the positioning assembly 5, after the wire-drawing bushing 6 is deformed, the wire-drawing bushing can be quickly and efficiently disassembled, assembled and replaced so as to ensure the wire-discharging effect of the bushing, thereby ensuring the wire drawing efficiency of the wire drawing equipment, in addition, the positioning plate 14 and the supporting plate 9 are of a radiating fin structure, which is convenient for conducting the heat on the wire drawing bushing 6 out in time and is beneficial to cooling the wire drawing bushing 6, meanwhile, the positioning plate 14 is arranged in a U-shaped structure, and the width of the opening of the positioning plate 14 is equal to the thickness of the bushing 6, so that the bushing 6 is just below the connecting pipe 4 after being fixed by the positioning plate 14 to prevent the molten glass from leaking laterally.

As shown in fig. 1, the wire drawing assembly 8 includes a fixing rod 20, a wire collecting tube 21, a telescopic cylinder 22, a telescopic rod 23, a motor 24 for rotation and a winding rod 25, the fixing rod 20 is connected to the support frame 1 and is disposed below the cooling member 7, the wire collecting tube 21 is disposed on the fixing rod 20, the telescopic cylinder 22 is disposed at the lower end of the side surface of the support frame 1 and is disposed below the fixing rod 20, the telescopic rod 23 is disposed at the lower end of the side surface of the support frame 1 away from the telescopic cylinder 22 and is disposed below the fixing rod 20, the motor 24 for rotation is disposed at the telescopic end of the telescopic cylinder 22, one end of the winding rod 25 is connected to the output end of the motor 24 for rotation and the other end is connected to the telescopic rod 23, during the wire drawing process, the wire passes through the wire collecting tube 21 and then is wound onto the winding rod 25, the motor 24 for rotation is connected to an external power supply, the motor 24 for rotation is started, the motor 24 for rotation drives the winding rod 25 to rotate, so as to draw and wind the glass wire, the telescopic cylinder 22 is connected with an external power supply, the telescopic cylinder 22 is started simultaneously in the winding process, the telescopic cylinder 22 drives the motor 24 and the winding rod 25 to move for rotation, so that the glass fiber is uniformly wound on the winding rod 25, and the glass fiber is wound on the winding rod 25 efficiently and uniformly through the arrangement of the wire drawing assembly 8, so that the wire drawing efficiency and the wire winding efficiency are improved.

As shown in fig. 1, the cooling member 7 includes a hydraulic machine 26, a cooling chamber 27, a cooling pipe 28, an air conditioner 29 and an air outlet 30, the hydraulic machine 26 is symmetrically disposed on the inner side wall of the support frame 1, the cooling chamber 27 is disposed on the telescopic end of the hydraulic machine 26, one end of the cooling pipe 28 is disposed under the bushing 6, the other end thereof penetrates through the cooling chamber 27 and is disposed under the cooling chamber 27, the air conditioner 29 is connected to the cooling chamber 27, the air outlet 30 is uniformly disposed on the upper wall and the lower wall of the cooling chamber 27, in the wire drawing process, the external power supply of the air conditioner 29 is connected, the air conditioner 29 is started, cold air enters the cooling chamber 27 and is uniformly sprayed out through the air outlet 30, on one hand, the glass fiber is cooled, on the other hand, the wire drawing bushing 6 is cooled, the wire drawing bushing 6 is prevented from being deformed due to overhigh temperature, in addition, the cooling part 7 is convenient to move through the arrangement of the hydraulic press 26, and a movable space is provided for the replacement of the bushing 6.

As shown in figure 1, the base 31 is uniformly arranged below the support frame 1, so that the contact area between the support frame 1 and the ground is increased, and the whole equipment is more stable.

When the device is used, raw materials are put into a smelting furnace 2 from a feeding hole 3, molten glass melted by the smelting furnace 2 enters a connecting pipe 4, then flows out into a cooling pipe 28 through a wire drawing bushing 6 by self gravity, silk threads pass through a wire collecting pipe 21 and then surround the silk threads onto a winding rod 25, the rotating motor 24 is connected with an external power supply, the rotating motor 24 is started, the rotating motor 24 drives the winding rod 25 to rotate, the silk threads are drawn and wound, the telescopic cylinder 22 is connected with the external power supply, the telescopic cylinder 22 is simultaneously started during winding, the telescopic cylinder 22 drives the rotating motor 24 and the winding rod 25 to move, so that the glass threads are uniformly wound onto the winding rod 25, meanwhile, the external power supply of an air cooler 29 is connected, an air cooler 29 is started, cold air enters a cooling chamber 27 and then is uniformly sprayed out through an air outlet 30, on one hand, the glass threads are cooled, on the other hand, the wire drawing bushing 6 is cooled, when the wire-drawing bushing 6 needs to be replaced, the hydraulic machine 26 is used for driving the cooling piece 7 to descend, the cooling pipe 28 is separated from the wire-drawing bushing 6, the driving motor 15 is connected with an external power supply, the driving motor 15 drives the bidirectional screw 17 to rotate, the bidirectional screw 17 drives the screw pair 18 to move back and forth, the wire-drawing bushing 6 is loosened, the wire-drawing bushing 6 is detached from the connecting pipe 4 and is convenient to replace, when the wire-drawing bushing 6 needs to be installed, the two ends of the wire-drawing bushing 6 are firstly placed in the positioning plates 14 on the two sides, the driving motor 15 is started again, the driving motor 15 drives the bidirectional screw 17 to rotate, the bidirectional screw 17 drives the screw pair 18 to move oppositely, the positioning plates 18 drive the positioning plates 14 to move oppositely, the wire-drawing bushing 6 is just jacked between the positioning plates 14 in the process of opposite movement, in addition, the positioning plates 14 do not influence the movement of the positioning plates 14 due to the arrangement of the connecting rod 13, the sliding rail 11 and the sliding block 12 in the process of opposite movement And 14, realizing height limitation, enabling the height of the wire drawing bushing 6 behind the mounting plate to be just below the connecting pipe 4, and finally utilizing a hydraulic machine 26 to drive the cooling part 7 to ascend, so that the cooling pipe 28 is aligned to a wire leaking port of the wire drawing bushing 6.

The present invention and its embodiments have been described above, and the description is not intended to be limiting, and the drawings are only one embodiment of the present invention, and the actual structure is not limited thereto. In summary, those skilled in the art should appreciate that they can readily use the disclosed conception and specific embodiments as a basis for designing or modifying other structures for carrying out the same purposes of the present invention without departing from the spirit and scope of the utility model as defined by the appended claims.

Claims

1. The glass fiber drawing equipment is characterized in that: the cooling device comprises a support frame, a smelting furnace, a feed inlet, a connecting pipe, a positioning assembly, a wire drawing bushing plate, a cooling part and a wire drawing assembly, wherein the smelting furnace is arranged on the support frame, the feed inlet is arranged on the smelting furnace, the connecting pipe is arranged below the smelting furnace and connected to the smelting furnace, the positioning assembly is arranged at the upper end in the support frame, the wire drawing bushing plate is detachably arranged in the positioning assembly and below the connecting pipe, the cooling part is connected to the support frame and arranged below the positioning assembly, and the wire drawing assembly is arranged at the lower end in the support frame and arranged below the cooling part; the positioning component comprises a supporting plate, a through groove, a sliding rail, a sliding block, a connecting rod, a positioning plate, a driving motor, a shaft seat, a bidirectional screw rod, a screw rod pair and a connecting block, the supporting plates are symmetrically arranged at the inner upper ends of the supporting frames, the through grooves are symmetrically arranged on the supporting plates, the slide rails are symmetrically arranged below the upper walls of the supporting frames, the slide block is movably arranged on the slide rail, the connecting rod is arranged below the slide block, the positioning plate is arranged below the connecting rod and between the supporting plates, the wire drawing bushing plates are arranged between the positioning plates, the driving motors are symmetrically arranged on the side surfaces of the supporting plates far away from the positioning plates, the shaft seats are symmetrically arranged on the side surface of the supporting plate far away from the driving motor, one end of the bidirectional screw rod is connected with the output end of the driving motor, the other end of the bidirectional screw rod is arranged in the shaft seats, the screw pair is symmetrically sleeved on the bidirectional screw, one end of the connecting block is connected to the positioning plate, and the other end of the connecting block is movably connected to the through groove in a penetrating manner and is connected to the screw pair.

2. A glass fiber drawing apparatus as defined in claim 1, wherein: the wire drawing subassembly includes dead lever, collection silk pipe, telescoping cylinder, telescopic link, changes and uses motor and winding stem, the dead lever is connected in the support frame and is located the cooling piece below, the collection silk pipe is located on the dead lever, the side lower extreme of support frame is located to the telescoping cylinder and locates the dead lever below, the telescopic link is located the support frame and is kept away from the side lower extreme of telescoping cylinder and locates the dead lever below, it is served with the flexible of motor locating the telescoping cylinder to change, winding stem one end is connected in the output and the other end of motor for the rotation and is connected in the telescopic link.

3. A glass fiber drawing apparatus as defined in claim 2, wherein: the cooling piece includes hydraulic press, cooling chamber, cooling tube, air conditioner and gas outlet, the hydraulic press symmetry is located on the inside wall of support frame, the cooling chamber is located the flexible of hydraulic press and is served, under just the other end runs through the cooling chamber and locates under the cooling chamber by cooling tube one end is located the wire drawing bushing, the air conditioner is connected in the cooling chamber, the gas outlet is evenly located on the upper wall and the lower wall of cooling chamber.

4. A glass fiber drawing apparatus as defined in claim 3, wherein: and a base is uniformly arranged below the support frame.

5. A glass fiber drawing apparatus as defined in claim 4, wherein: the positioning plate and the supporting plate are of radiating fin structures.

6. A glass fiber drawing apparatus as defined in claim 5, wherein: the locating plate is arranged in a U-shaped structure.