RU174532U1 - WELDING UNIT FOR MANUFACTURING Billets of thermoplastic bags for vacuum cleaners - Google Patents

Abstract

The proposed utility model relates to the field of mechanical engineering, relates to a welding unit for the manufacture of thermoplastic bag blanks for vacuum cleaners, which can be implemented in a semiautomatic machine for welding longitudinal and transverse seams, as well as for burning holes on one side of the blanks of thermoplastic bags for vacuum cleaners. The welding unit contains a frame on which nichrome heating elements are fixed that form the edges of the workpieces, and nichrome rings burning openings on one of the sides of the workpieces, a tabletop on which the workpiece divider is fixed to the upper and lower layers and the counter part of the frame is mounted, a control unit, a timer , a power source, a transport unit that moves the frame with heating elements between the upper and lower points according to the signals received from the control unit, while on the workpiece separator on the upper and lower layers of PTFE-silicone rubber with grooves are fixed; strips of PTFE-silicone rubber with grooves are fixed on the counter part of the frame; nichrome heating elements are made in the form of a transverse nichrome string and longitudinal nichrome strings commuting with the power source through a timer according to the signals received from the control unit, and the frame with nichrome heating elements is axially mounted above the workpiece separator on the upper and lower layers and above the counterpart of the frame in such a way of Nichrome ring mounted axially above the grooves of the rings PTFE-silicone rubber, and nichrome string axially mounted above the grooves strips of Teflon-silicone rubber. The technical result from the use of the proposed utility model is to improve the quality of welds and the quality of burned holes in the blanks of thermoplastic bags of vacuum cleaners with an opening on one side, and reduced energy consumption. 6 c.p. crystals, 4 FIG.

Description

The proposed utility model relates to the field of mechanical engineering, relates to a welding unit for the manufacture of thermoplastic bag blanks for vacuum cleaners, which can be implemented in a semiautomatic machine for welding longitudinal and transverse seams, as well as for burning holes on one side of the blanks of thermoplastic bags for vacuum cleaners.

A device for the manufacture of packages of thermoplastic film (ed. St. N 1654007, class B29C 65/02, publ. 06/07/91), in which at the input of the device has a longitudinal welding mechanism, issuing sleeve semi-finished product, welded from two polyethylene panels.

The disadvantage of this device is the limited possibility of readjustment for the manufacture of packages, different in length and width. The dimensions of the packages have a relatively large tolerance in length due to the inertia of the extended kinematic chain of the control action from the measuring mechanism on the actuating lever-feed chopper. Poor quality of the welded joint, because, firstly, welding is carried out by one-sided heating, and not by fusion in the joint for both films of the sleeve in the weld pool, and secondly, the technology does not guarantee the quality and uniformity of the weld without warping of the film, which is not fixed in the welding unit, welding stresses arise due to the temperature gradient during sudden cooling.

The technical solution of the electrode for welding thermoplastic materials is known, namely the use of an electric wire in fluoroplastic insulation as an electrode for welding and cutting of thermoplastic materials (ed. St. No. 1344619, class B29C 65/18, B29C 65/22, publ. 15.10. 1987). Using this solution alone does not allow us to solve the problem of manufacturing bags for vacuum cleaners, since it provides only one function of the device - welding and cutting of film layers that are already interconnected.

The closest known technical solutions of welding devices used for the manufacture of bags from thermoplastic materials is the welding unit described in the application for the invention No. 94017315, class. B29C 65/02, B29C 65/22, publ. 07/10/1996, "Device for the manufacture of packages of thermoplastic material." Its essence lies in the fact that the welding unit includes a crosshead supporting the electric heater and a vertically movable clamp mounted axially above the support, while longitudinal grooves for the electric heater mounted on the crosshead are made in the hollow support in communication with the fittings with the refrigerant supply line and the clamp of the welding unit. by means of a spring compensator, and the clamp for the flanges of the fittings is freely suspended on the traverse, equipped with an adjustable stop, on the rod of the unwinding unit, the knife is installed with the possibility of remescheniya, and spring-loaded knife is designed as a separator.

This device for the manufacture of packages of thermoplastic material does not provide all the required functions (holes are not burned in it, the bags are single-layer). Its technical disadvantages include a rather high complexity and high power consumption of the device due to the large number of mechanical components and parts.

Also, the use of a refrigerant supply system in communicating by means of fittings with a trunk of a hollow support and clamp of a welding unit is excessive when used in the inventive device.

The utility model aims at improving the welding unit for the manufacture of thermoplastic bag blanks for vacuum cleaners, easily reconfigurable for the manufacture of bags of different sizes.

The technical result from the use of the proposed utility model is to improve the quality of welds and the quality of burnt holes in the blanks of thermoplastic bags of vacuum cleaners with an opening on one side, and reduce energy consumption.

This is achieved by the fact that the welding unit for manufacturing blanks of thermoplastic bags for vacuum cleaners contains a frame on which nichrome heating elements are fixed that form the edges of the blanks, and nichrome rings burning openings on one side of the blanks, a tabletop on which the blank separator is fixed to the upper and lower layers and the mating part of the frame, control unit, timer, power supply, transport unit, moving the frame with heating elements between the upper and lower points along the signal Alam coming from the control unit, while on the separator of the workpiece on the upper and lower layers are fixed rings of fluoroplastic-silicone rubber with grooves, strips of fluoroplastic-silicone rubber with grooves are fixed on the counter part of the frame, nichrome heating elements forming the edges of the blanks are made in the form of a transverse nichrome string and longitudinal nichrome strings commutated with a power source through a timer according to the signals coming from the control unit, the frame with nichrome heating elements ak sialously mounted above the workpiece separator on the upper and lower layers and above the counterpart of the frame so that nichrome rings are axially mounted above the grooves of the PTFE-silicone rubber rings, and nichrome strings are axially mounted above the grooves of the PTFE-silicone rubber strips; in space the countertop, the separator of the workpiece into the upper and lower layers and the counterpart of the frame, are preferably located horizontally and at the same level; the workpiece separator on the upper and lower layers is attached to the countertop by means of a support; nichrome heating elements are made in the form of a transverse nichrome string and nichrome frames; on the mating part of the frame, frames made of fluoroplastic silicone rubber are fixed with grooves, the nichrome frames axially mounted above the grooves of the frames made of fluoroplastic silicone rubber; the transport unit contains pneumatic actuators with electromagnetic valves, an end having a movable part moving with the frame, and fixed parts installed in the upper and lower positions of the frame, according to the state of the signals of which the frame is moved with the heating elements up or down; the timer determines the start time of switching after lowering the frame with heating elements to the counterpart of the frame and the switching time of the heating elements with a power source.

In FIG. 1 shows a General view of the welding unit for the manufacture of blanks thermoplastic bags for vacuum cleaners.

In FIG. 2 shows a frame with nichrome heating elements of the welding unit for the manufacture of blanks of thermoplastic bags for vacuum cleaners, where: a - a frame with nichrome strings; b - a frame with nichrome frames.

In FIG. Figure 3 shows the rings and strips of fluorine-silicone rubber welding unit for the manufacture of blanks thermoplastic bags for vacuum cleaners.

In FIG. 4 is a functional diagram of a welding unit for the manufacture of blanks of thermoplastic bags for vacuum cleaners.

Structurally, the device for the manufacture of bag blanks for a vacuum cleaner from thermoplastic materials in FIG. 1-4 contains:

1 - frame

2 - countertop,

3 - support

4 - separator blanks on the upper and lower layers,

5 - rings made of PTFE-silicone rubber,

6 - grooves,

7 - the response of the frame,

8 - strips of ftoroplast-silicone rubber,

9 - grooves,

10 - nichrome heating elements,

11 - transverse nichrome string,

12 (I-V) - longitudinal nichrome strings,

13 (I-V) - nichrome frames,

14 (I-V) - nichrome rings,

15 - control unit,

16 - timer

17 - power source,

18 - transport node

19 is the highest point

20 - bottom point

21 - communication lines between the control unit and the power source,

22 - pneumatic actuators,

23 - solenoid valves

24 - the movable part of the trailer,

25 - the fixed part of the trailer at the upper point,

26 - the fixed part of the trailer at the lower point,

27 is an electrical communication line between the control unit and the contact of the trailer installed at the upper point,

28 is an electrical communication line between the control unit and the contact of the trailer mounted at the lower point,

29 - electric communication line between the control unit and the electromagnetic valves of the pneumatic actuators,

30 is an electrical communication line between the control unit and the heating elements and nichrome rings.

On the frame 1 are fixed nichrome heating elements 10, forming the edges of the bag, and nichrome rings 14, burning holes on one side of the manufactured blanks of the bags.

Nichrome heating elements 10 forming the edges of the bag are made in the form of a transverse string 11 and longitudinal strings 12.

Nichrome heating elements 10, forming the edges of the bag, can be made in the form of a transverse string 11 and nichrome frames 13.

On the countertop 2, a workpiece separator is fixed to the upper and lower layers 4, and the counterpart of the frame 7 is also installed.

A nichrome transverse string 11 is placed above the tabletop 2 between the web divider on the upper and lower layers 4 and the counterpart of the frame 7.

The separator of the workpiece on the upper and lower layers 4 can be fixed on the countertop 2 by means of a support 3.

In the space of the countertop 2, the workpiece separator into the upper and lower layers 4 and the counterpart of the frame 7 are preferably arranged horizontally and at the same level.

On the separator of the workpiece on the upper and lower layers 4, rings of fluoroplastic silicone rubber 5 are installed, made with grooves 6.

On the mating part of the frame 7, strips of fluoroplastic-silicone rubber 8 are installed, made with grooves 9.

On the mating part of the frame 7 can be installed frame of fluoroplastic-silicone rubber with grooves.

Frame 1 with nichrome heating elements 10 is axially mounted above the workpiece separator on the upper and lower layers 4 and above the counterpart of frame 7 so that nichrome rings 14 are axially mounted above the grooves 6 of PTFE-silicone rubber rings 5, and nichrome heating elements 10, the forming edges of the blanks are axially mounted above the grooves of 9 strips of fluoroplastic-silicone rubber 8 on the counterpart of the frame 7.

In the case when nichrome heating elements 10 are used, which form the edges of the workpieces, in the form of frames, they are axially mounted above the grooves of the frames of fluoroplastic-silicone rubber on the counterpart of the frame 7.

Nichrome heating elements 10 and nichrome rings 14 are switched with a power source 17 by signals received via communication lines 21 from the control unit 15.

Frame 1 with nichrome heating elements 10 is made vertically movable between the upper 19 and lower 20 points by means of a transport unit 18.

The transport unit 18 may include pneumatic actuators 22 with solenoid valves 23, a trailer having a movable part 24, moving together with the frame with heating elements 1, and fixed parts of the trailer at the upper and lower points 25 and 26 in the form of contacts installed in the upper 19 and lower 20 points, according to the state of the signals from which transmitted via communication lines 27 and 28, the frame is moved with the heating elements 1 up or down.

The control unit 15 may include a timer 16, which determines the switching time of the nichrome heating elements 10 with the power source 17 based on the combination of signals from the fixed part of the limit switch at the upper point 29 and the signal from the fixed part of the limit switch at the lower point 30. The proposed utility model works as follows.

First prepare the device for work. Nichrome heating elements 10 are fixed on the frame 1, forming the edges of the bag blanks (either nichrome strings - transverse 11 and longitudinal 12 (I-V), or nichrome transverse string 11 and nichrome frames 13 (I-V)).

Layers of breathable thermoplastic material are fed to and under the workpiece separator on the upper and lower layers 4 and then all layers - and the upper and lower layers are laid on the counterpart of the frame 7.

On the separator blanks on the upper and lower layers 4 form the upper layer of the blank of the bag, consisting of 1-3 layers of thermoplastic material (depending on the type of bag made).

The control unit 15 from the contacts of the fixed parts of the trailer at the upper and lower points 25 and 26 through the electrical connections 27 and 28 receive signals.

Based on the totality of these signals, control signals are generated at the output of the control unit 15, which, respectively, are transmitted to the electromagnetic valves 23 of the pneumatic actuators 24 of the transport unit 18, which drive the frame 1 with heating elements 10 and participate in the formation of signals switching with the power source 17 nichrome heating elements 10 and nichrome rings 14 (IV).

At the initial moment of operation, the frame 1 with heating elements 10 with the movable part of the trailer 24 mounted on it is located at the upper point 19. In this case, the mobile part of the trailer 24 is in contact with the fixed part (contact) 25 of the trailer at the upper point 19. On the electric communication line 27 this generates an active signal, which is transmitted through it to the control unit 15.

In response to this signal, a signal is generated that enters the solenoid valve 23. As a result, the frame 1 with heating elements 10 from the upper position 19 is lowered down to the lower position 20, while the contacts between the fixed part of the trailer at the upper point 25 and the frame 1 with heating elements 10 with the movable part of the trailer 24 attached to it lowers to the lower point 20, while the contacts of the fixed part of the trailer at the lower point 26 and the movable part of the trailer 24 are closed, about which via an electric communication line 28 an active signal is generated between the control unit 15 and the contact of the trailer mounted at the lower point.

In this case, the frame 1 with the heating elements 10 is lowered onto the mating part of the frame 7 and onto the workpiece separator onto the upper and lower layers 4. The nichrome heating elements 10 are lowered into the grooves 9 on the strips of fluoroplastic silicone rubber 8. The nichrome rings 14 (IV) are lowered into the grooves 6 on the rings of fluoroplastic silicone rubber 5. In this case, the nichrome heating elements 10 tightly press the layers of the thermoplastic material to be welded to the mate of the frame 7 and to the workpiece separator on the upper and lower layers 4 on which it lies.

Based on the set of signals on the control unit 15, a timer 16 is started that defers switching of the heating elements 10 (transverse nichrome strings 11 and longitudinal nichrome strings 12 (IV), or nichrome frames 13 (IV)) and nichrome rings 14 (IV) with a power source 17 for 0.5-1.5 sec.

Next, the power source 17 is connected to the nichrome strings 11, 12 (IV), or to the nichrome frames 13 (IV) and to the rings 14 (IV) for the time determined by the timer 16, and for this it supplies an active signal via an electric communication line between the control unit and heating elements and nichrome rings 30. The timer 16 for 0.2 ÷ 3 seconds commutes the power source 17 with nichrome strings 11, 12 (IV), or with a nichrome string 11 and nichrome frames 13 (IV), and with nichrome rings 14 (Iv). In this case, a constant electric current of 9-12 volts is supplied to the heating elements. Due to this, nichrome rings 14 (I-V) burn holes in the upper layer of the bag blanks, uniformly fusing the edges, nichrome strings 12 (I-V), or frames 13 (I-V) weld longitudinal seams, a transverse nichrome string 11 welds a transverse seam.

After performing the welding operation, after a predetermined time, the signal is input to the solenoid valve 23 input via an electric communication line between the control unit and the electromagnetic valves of the electric actuators 29 and the pneumatic actuators 22 return the frame 1 with heating elements 10 to their original upper position (to the upper point 19).

Next, the cycle is repeated.

Get the blanks of thermoplastic bags for vacuum cleaners with smooth (no nicks) welds and rounded edges of the holes, 0.6-0.7 mm thick, 2-5 kg / cm strength.

The execution of the mating parts (ringlets 5 and strips 8) of nichrome heating elements 10 of fluoroplastic-silicone rubber improves the quality of welds and edges of burned holes due to better surface tension of the melt of thermoplastic material in grooves 6, 9. Improves the quality of welds and edges of burned holes contributes to the optimal heating time of the nichrome heating elements 10, maintained by the timer 16 in the control unit 15, during which the switching of the power source with heating elements. The use of a timer 16 for heating nichrome heating elements 10 and an electric current of 9-12 volts helps to reduce electricity consumption.

Example.

The proposed utility model solution can be implemented in a semi-automatic machine on which blanks for bags for vacuum cleaners are made.

The device used double-acting pneumatic cylinders with a diameter of 50 mm, various lengths from 350 mm to 850 mm.

Magnetic sensors were used as limit switches (they are installed on the cylinder (according to marks obtained experimentally).

For the manufacture of the command unit used chips K555TM7, K155TM7, KR1533TM7, SN74ALS75 (analogue KP1533TM7), SN74LS75 (analogue K555TM7), SN7475 (analogue K155TM7).

The following bag options can be made on the machine, for example:

- two-layer dust-proof bags for household and industrial vacuum cleaners with a size of 600 × 300 mm, 600 × 450 mm;

- three-layer dust-proof bags for household and industrial vacuum cleaners with a size of 600 × 300 mm, 600 × 450 mm.

For the manufacture of a two-layer bag, 4 layers of material are used: spunlite meltblown spanbond (CMC) - spunlite spunbond (SS) - spunlate spanbond (SS) - spunlite meltblown spanbond (CMC). Spunlite Meltblown Spunbond (CMC) is used as a reinforcing-filtering layer that holds particles up to 20 microns. Spanlite spanbond (SS) is used as a coarse filter and as a protective layer to reduce the kinetic energy of incoming heavy particles to 100 microns, to prevent damage to the bag. The thickness of the seam and the thickness of the two-layer bag are 0.6 mm, the tensile strength is 29.41 N-68.64 N per 1 cm of the seam.

For the manufacture of a three-layer bag, 6 layers of material are used: spunlite meltblown spanbond (CMC) - meltblown (M) - spunlite spunbond (SS) - spunlite spunbond (SS) - meltblown (M) - spunlite meltblown spanbond (CMC). Spunlite Meltblown Spunbond (CMC) is used as a reinforcing-filtering layer that holds particles up to 20 microns. Meltblown (M) is used as a fine filter holding particles up to 1 micron. Spanlite spanbond (SS) is used as a coarse filter and as a protective layer to reduce the kinetic energy of incoming heavy particles to 100 microns, to prevent damage to the bag. The thickness of the seam and the thickness of the three-layer bag are 0.7 mm, the tensile strength is 29.41 N-68.64 N per 1 cm of the seam. The thickness of the seam and the thickness of the three-layer bag are 0.7 mm, the tensile strength is 29.41 N-68.64 N per 1 cm of the seam.

Claims (7)

1. The welding unit for the manufacture of blanks of thermoplastic bags for vacuum cleaners contains a frame on which nichrome heating elements are fixed that form the edges of the blanks, and nichrome rings burning holes on one side of the blanks, a tabletop on which the blank separator is fixed to the upper and lower layers and a mating part of the frame, a control unit, a timer, a power source, a transport unit that moves the frame with heating elements between the upper and lower points are installed according to the signals received from the unit control eye, while on the separator of the workpiece on the upper and lower layers are fixed rings of fluoroplastic silicone rubber with grooves, strips of fluoroplastic silicone rubber with grooves are fixed on the counter part of the frame, nichrome heating elements forming the edges of the blanks are made in the form of a transverse nichrome strings and longitudinal nichrome strings commutated with a power source through a timer according to the signals coming from the control unit, and the frame with nichrome heating elements is axially mounted on hell with the workpiece separator on the upper and lower layers and above the counterpart of the frame so that nichrome rings are axially mounted above the grooves of the PTFE-silicone rubber rings, and nichrome strings are axially mounted above the grooves of the PTFE-silicone rubber strips. 2. The welding unit according to claim 1, characterized in that in the space the countertop, the workpiece separator into the upper and lower layers and the counterpart of the frame are preferably located horizontally and at the same level. 3. The welding unit according to claim 1, characterized in that the workpiece separator on the upper and lower layers is attached to the tabletop by means of a support. 4. The welding unit according to claim 1, characterized in that the nichrome heating elements are made in the form of a transverse nichrome string and nichrome frames. 5. The welding unit according to claim 1, characterized in that on the counterpart of the frame there are fixed frames made of fluoroplastic-silicone rubber with grooves, the nichrome frames axially mounted above the grooves of the frames made of fluoroplastic-silicone rubber. 6. The welding unit according to claim 1, characterized in that the transport unit comprises pneumatic actuators with electromagnetic valves, an end having a movable part moving with the frame, and fixed parts installed in the upper and lower positions of the frame, the state of the signals of which are moving frames with heating elements up or down. 7. The welding unit according to claim 1, characterized in that the timer determines the start time of switching after lowering the frame with heating elements to the counterpart of the frame and the switching time of the heating elements with a power source.

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