Hardware cutting machine tool

Abstract

The utility model relates to a hardware cutting machine tool which comprises a machine box and a collecting chamber arranged at the bottom of the machine box, a workbench is arranged in the machine box, a rotating seat and two sets of cutting mechanisms are arranged on the workbench, a clamp is installed on the rotating seat, the bottom of the rotating seat is connected with a servo motor, and the servo motor is connected with the collecting chamber. A waste channel is arranged on the peripheral side of the rotating seat in a surrounding mode, a collecting mechanism is arranged in the collecting chamber and comprises a collecting box, the collecting box is located below the waste channel, the cutting mechanism comprises a rotating motor, a mounting shaft and a cutting tool mounted at the end of the mounting shaft, a mounting frame is arranged above the clamp, and the cutting tool is arranged on the mounting frame. A lifting driving device is connected to the top of the mounting frame, an air inlet pipeline and a material blocking cover are mounted on the mounting frame, the material blocking cover is mounted at the bottom of the mounting frame, and a receding groove is formed in the material blocking cover. The device has the advantages of high processing efficiency, high precision, easiness in cleaning and use and the like.

Description

TECHNICAL FIELD

[0001] The utility model relates to hardware machining technical field, specifically, relate to a hardware cutting machine. BACKGROUND

[0002] Cutting is a machining method that uses a tool with a regular shape to remove excess material from the surface of a workpiece, ensuring that the geometry, dimensional accuracy, surface roughness, and surface layer quality all meet design requirements.

[0003] Traditional cutting machine is through the fixture to fix the workpiece, drive the cutter rotation and close to the workpiece, to the workpiece cutting work, but because the fixture is fixed installation, and part workpiece needs to process multiple face, so need to frequently dismount workpiece from the fixture in the processing process, adjust the angle and reinstallation, continue to process again, this kind of operation is more troublesome, reduce the processing efficiency, in addition, the cutting machine of the prior art will generate a large amount of heat when cutting the workpiece, if the heat is not dissipated in time, it will accumulate on the workpiece and cause thermal expansion and contraction, thereby affecting the machining accuracy, in addition, a large amount of debris will be generated during the cutting process, which will splash to various positions of the machine tool, making the cleaning very troublesome, therefore, there is an urgent need for a cutting machine that can solve the above problems. SUMMARY

[0004] Therefore, in view of the problems existing in the prior art, the utility model provides a hardware cutting machine that can solve the above problems.

[0005] A hardware cutting machine, comprising a machine box, a workbench inside the machine box, a rotating seat and two sets of cutting mechanisms on the workbench, the two sets of cutting mechanisms being arranged on both sides of the rotating seat, a clamp installed on the rotating seat, a servo motor connected to the bottom of the rotating seat, a waste channel arranged around the rotating seat, the waste channel penetrating through the workbench in the vertical direction, a collection chamber at the bottom of the machine box, a collection mechanism inside the collection chamber, the collection mechanism comprising a collection box, the collection box being located below the waste channel, the cutting mechanism comprising a rotating motor, an installation shaft connected to the output end of the rotating motor, and a cutting tool installed at the end of the installation shaft, an installation rack above the clamp, a lifting driving device connected to the top of the installation rack, an air inlet pipe and a material blocking cover installed on the installation rack, the air outlet of the air inlet pipe facing the clamp, the material blocking cover being installed at the bottom of the installation rack, and a clearance groove on the material blocking cover for accommodating the installation shaft.

[0006] The machine tool is used, and hardware workpieces are fixed on clamps for installation, rotating motors on the two sides drive the rotating shaft to rotate, and the rotating motor drives the cutting tool to rotate to cut the workpieces, wherein the clamp is installed on the rotating seat, the rotating seat can rotate under the drive of the servo motor, so that the direction of the workpiece is adjusted to meet the processing needs of various angles, before the workpiece is processed, the lifting drive device can drive the mounting frame to move downward, the material blocking cover on the mounting frame can cover the waste material channel and the clamp inside, and the waste material generated during cutting is blocked to prevent the waste material from splashing to other areas, so that the waste material falls into the waste material channel on the periphery, meanwhile, the air inlet pipeline on the mounting frame is connected with the external air pressure device, air is blown towards the clamp, the workpiece during processing is cooled, the thermal expansion and cold shrinkage phenomenon of the workpiece due to high temperature is avoided, the processing precision is improved, and the waste material falling on the clamp and the workpiece is blown off to fall into the waste material channel, and the bottom of the waste material channel is provided with a collection box for collecting the waste material.

[0007] Further, the rotating seat is provided with an installation column below, the installation column is provided with a cavity for accommodating the servo motor, and the installation column is provided with a connecting rib on the periphery, and the end of the connecting rib is connected with the side wall of the waste material channel.

[0008] In the technical scheme, the installation column is installed in the center of the waste material channel through the connecting rib, so as to provide the installation position for the servo motor and the rotating seat.

[0009] Further, the workbench is provided with an annular baffle, the annular baffle is arranged around the outside of the waste material channel, and the size of the annular baffle is matched with that of the material blocking cover.

[0010] In the technical scheme, after the material blocking cover is lowered, the bottom end of the material blocking cover abuts against the top of the annular baffle, so that the gap is eliminated, and the waste material is prevented from splashing out.

[0011] Further, the cutting mechanism further comprises a sliding rail and a linear drive, a sliding block is slidably installed on the sliding rail, the linear drive is connected with the sliding block, and the rotating motor is installed on the sliding block.

[0012] In the technical scheme, the linear drive can drive the sliding block to move on the sliding rail, so that the cutting tool is close to and away from the workpiece to cut the workpiece, and meanwhile, the displacement amount of the linear drive can be controlled to control the feeding amount of cutting.

[0013] Further, the collection mechanism comprises a guide rail, a sliding seat is installed on the guide rail, the collection box is detachably installed on the sliding seat, a uniform material driving motor is connected to one side of the sliding seat, and the uniform material driving motor is used to drive the sliding seat to reciprocate along the guide rail.

[0014] In the above technical solution, the debris generated by partial cutting is in a winding shape, and the diameter and shape of various debris are greatly different, which causes large gaps after the debris is put into the collection box, reduces the space utilization of the collection box, and simultaneously, due to the blockage of the mounting column, the debris cannot fall into the collection box area located directly below the mounting column, which causes the area to be easily empty, affecting the space utilization, therefore, the uniform material driving motor is arranged to move the sliding seat on the guide rail, and the collection box is made to reciprocate, the debris scattered inside the collection box is more evenly distributed, and the debris is more tightly stacked, the space utilization of the collection box is improved, and frequent cleaning work of the collection box is avoided.

[0015] Further, a fixed plate is arranged between the uniform material driving motor and the guide rail, a connecting rod is slidably arranged on the fixed plate, one end of the connecting rod is connected with the sliding seat, and the other end of the connecting rod is provided with a push plate, an elastic member is arranged on the connecting rod, and two ends of the elastic member are respectively abutted with the fixed plate and the push plate.

[0016] In the above technical solution, the uniform material driving motor can drive the cam to rotate, periodically contact and push the push plate, make the connecting rod slide on the fixed plate, the elastic member is compressed when the push plate is pushed by the cam, and the push plate is reset when the cam is separated from the push plate, so as to drive the sliding seat to make periodic reciprocating motion, and the collection box can achieve the effect of shaking and uniforming materials, and the cam is arranged to drive the sliding seat to make reciprocating motion, which can greatly save the occupied space of the whole collection mechanism.

[0017] Further, a control panel and a switch door are arranged on the case, and a first observation window is arranged on the switch door.

[0018] In the above technical solution, the machine tool is built-in with a control program, and each component can be controlled, the control panel is used for intelligent control of the machine tool by the worker, the switch door is used for opening the case to facilitate installation of the workpiece or replacement of the cutting tool, and the first observation window is arranged on the switch door, so that the machining condition inside can be observed in real time through the first observation window during machining.

[0019] Further, a material taking door is arranged on the collection chamber, and a second observation window is arranged on the material taking door.

[0020] In the above technical solution, the collection chamber can be opened through the material taking door, so that the collection box is taken out, and the collected debris and waste materials inside are treated, and the second observation window is arranged on the material taking door, so that the worker can observe the waste material collection condition of the internal collection box in real time.

[0021] Compared with the prior art, the beneficial effects of the present application are as follows:

[0022] The utility model discloses a material blocking cover and air inlet pipeline are set up, and the material blocking cover can block the scrap produced when cutting, prevents the scrap from splashing to other areas, and the air inlet pipeline can blow air to the direction of the clamp, cools the workpiece in processing, improves the processing precision, and can blow off the scrap falling on the clamp and the workpiece, so that the scrap falls into the waste channel, through the material blocking cover and the air inlet pipeline, the scrap can be collected, the scrap can not splash to other positions of the machine tool, the machine tool does not need to be cleaned and maintained frequently, and the practicability and reliability of the machine tool are improved.

[0023] The utility model discloses through setting up rotary seat and servo motor, can make the clamp and the workpiece of installing on the clamp rotate, avoid frequently disassembling workpiece to adjust position, improve use convenience, simultaneously, the both sides of clamp are equipped with two cutting mechanism, can process the both sides of workpiece simultaneously, improved hardware's processing efficiency obviously. BRIEF DESCRIPTION OF DRAWINGS

[0024] In order to more clearly illustrate the technical scheme of the embodiment of the present application, the following will briefly introduce the drawing needed to be used in the embodiment, should understand, the following drawing only shows some embodiments of the present application, therefore should not be seen as the limitation to the scope, for ordinary skilled person in the art, under the premise of not paying the creative labor, can also obtain other related drawings according to these drawings.

[0025] Figure 1 It is the structural schematic diagram of hardware cutting processing machine tool of an embodiment.

[0026] Figure 2 It is the structural schematic diagram of the inside of the machine box of hardware cutting processing machine tool.

[0027] Figure 3 It is Figure 2 It is the enlarged view of A area in the middle.

[0028] Figure 4 It is the top view of workbench.

[0029] Figure 5 It is the cooperation schematic view of material blocking cover let -go slot position and ring fender and installation shaft

[0030] The reference numerals in the drawing are explained as follows:

[0031] 1 - cabinet; 11 - control panel; 12 - switch door; 13 - first observation window; 2 - workbench; 21 - waste channel; 22 - rotating seat; 23 - mounting column; 231 - servo motor; 24 - connecting rib; 25 - clamp; 26 - workpiece; 27 - annular baffle; 3 - cutting mechanism; 31 - rotating motor; 311 - mounting shaft; 312 - cutting tool; 32 - sliding block; 33 - sliding rail; 34 - linear driving piece; 4 - mounting frame; 41 - air inlet pipe; 42 - material blocking cover; 421 - accommodation groove; 5 - lifting driving device; 6 - collection chamber; 61 - material taking door; 62 - second observation window; 7 - collection mechanism; 71 - collection box; 72 - sliding seat; 73 - guide rail; 74 - uniform material driving motor; 741 - cam; 75 - fixed plate; 76 - connecting rod; 761 - elastic piece; 77 - pushing plate. DETAILED DESCRIPTION

[0032] To make the objectives, technical solutions and advantages of the embodiments of the present application clearer, the following will be combined with the accompanying drawings for the embodiments of the present application to make a clear and complete description of the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. The components of the embodiments of the present application described and shown in the accompanying drawings can be arranged and designed in various different configurations.

[0033] Therefore, the following detailed description of the embodiments of the present application provided in the accompanying drawings is not intended to limit the scope of the claimed present application, but only represents selected embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative work are within the scope of protection of the present application.

[0034] It should be noted that: similar reference numerals and letters represent similar items in the following drawings, therefore, once an item is defined in one drawing, it does not need to be further defined and explained in the subsequent drawings.

[0035] It should be noted that: in the case of no conflict, the embodiments in the present application and the features in the embodiments can be combined with each other.

[0036] The technical solutions in the present application will be described below in combination with the accompanying drawings.

[0037] Please refer to Figures 1 to 5The embodiment provides a hardware cutting machine for cutting hardware, which comprises a machine box 1, a collecting chamber 6 arranged at the bottom of the machine box 1, a workbench 2 arranged in the machine box 1, a rotating seat 22 and two sets of cutting mechanisms 3 arranged on the workbench 2, the two sets of cutting mechanisms 3 being symmetrically arranged at two sides of the rotating seat 22, a clamp 25 arranged on the rotating seat 22, a servo motor 231 connected to the bottom of the rotating seat 22, a waste channel 21 arranged around the rotating seat 22, the waste channel 21 penetrating the workbench 2 in the vertical direction, the collecting chamber 6 arranged at the bottom of the machine box 1, a collecting mechanism 7 arranged in the collecting chamber 6, the collecting mechanism 7 comprising a collecting box 71, the collecting box 71 being arranged below the waste channel 21, the cutting mechanism 3 comprising a rotating motor 31, a mounting shaft 311 connected to the output end of the rotating motor 31 and a cutting tool 312 arranged at the end of the mounting shaft 311, the bottom of the rotating motor 31 being provided with a sliding rail 33, a sliding block 32 being slidingly arranged on the sliding rail 33, a linear driving part 34 being connected to the sliding block 32, the rotating motor 31 being arranged on the sliding block 32, one side of the sliding block 32 being connected to the linear driving part 34, the linear driving part 34 being capable of driving the sliding block 32 to move along the sliding rail 33, the top of a mounting frame 4 being arranged above the clamp 25, a lifting driving device 5 being connected to the top of the mounting frame 4, the lifting driving device 5 being arranged on the top of the machine box 1, an air inlet pipe 41 and a material blocking cover 42 being arranged on the mounting frame 4, the air inlet pipe 41 being connected to an external air compressor (not shown in the figure), the air outlet of the air inlet pipe 41 being directed to the clamp 25, the material blocking cover 42 being arranged at the bottom of the mounting frame 4, the material blocking cover 42 being provided with a clearance groove 421 for accommodating the mounting shaft 311.

[0038] Specifically, when in use, the hardware workpiece 26 is fixed on the clamp 25, the rotating motor 31 on the two sides drives the rotating shaft 311 to rotate, and drives the cutting tool 312 to rotate to cut the workpiece 26, the linear driving part 34 can drive the sliding block 32 to move on the sliding rail 33, so that the rotating driving part and the cutting tool 312 connected therewith are close to and away from the workpiece 26, so as to cut the workpiece 26, and at the same time, the displacement of the linear driving part 34 can be controlled to control the cutting feed amount, so as to cut the workpiece 26. When working, the clamp 25 is installed on the rotating seat 22, and the rotating seat 22 can rotate under the drive of the servo motor 231, and the servo motor 231 can accurately control the rotation angle of the rotating seat 22, so as to adjust the orientation of the workpiece 26 to meet the processing needs of various angles. Before processing the workpiece 26, the lifting driving device 5 can drive the mounting frame 4 to move downward, and the material blocking cover 42 on the mounting frame 4 can cover the waste material channel 21 and the clamp 25 inside to block the cutting scraps to prevent the cutting scraps from splashing to other areas and falling into the waste material channel 21 on the periphery. At the same time, the air inlet pipeline 41 on the mounting frame 4 blows air towards the clamp 25 under the action of the external air compressor, so as to cool the workpiece 26 during processing, avoid thermal expansion and cold shrinkage of the workpiece 26 due to high temperature, improve the processing precision, and blow the cutting scraps falling on the clamp 25 and the workpiece 26 to fall into the waste material channel 21. The bottom of the waste material channel 21 is provided with a collection box 71 for collecting the cutting scraps falling from the waste material channel 21.

[0039] Preferably, the air inlet pipeline 41 is a foldable and telescopic pipeline to facilitate the upward and downward movement of the mounting frame 4.

[0040] Please refer to Figures 2 to 4 In the embodiment, the rotating seat 22 is provided below the mounting column 23, the mounting column 23 is provided with a cavity for accommodating the servo motor 231, the mounting column 23 is provided with two connecting ribs 24, one end of the two connecting ribs 24 is connected with the outer periphery of the mounting column 23, and the other end is connected with the side wall of the waste material channel 21, the mounting column 23 is mounted in the center of the waste material channel 21 through the connecting ribs 24 to provide a mounting position for the servo motor 231 and the rotating seat 22, and the number of the connecting ribs 24 can be flexibly adjusted according to actual needs.

[0041] Please refer to Figures 2 to 5 In the embodiment, the workbench 2 is provided with a ring-shaped baffle 27, the ring-shaped baffle 27 is arranged around the outside of the waste material channel 21, the height of the ring-shaped baffle 27 is lower than that of the rotating shaft 311 to avoid interference, the size of the ring-shaped baffle 27 matches that of the material blocking cover 42, and the bottom end of the material blocking cover 42 abuts against the top of the ring-shaped baffle 27 after descending, so as to eliminate the gap and form a closed space to prevent the cutting scraps from splashing out, and the like. Figure 5As shown, the annular baffle 27 is provided with a clearance slot 421 located directly above the mounting shaft 311, and when the material blocking cover 42 contacts the annular baffle 27, the mounting shaft 311 connected with the rotating motor 31 passes through the clearance slot 421 to avoid interference with the mounting shaft 311.

[0042] Preferably, the material blocking cover 42 and the annular baffle 27 in the embodiment are both circular ring shapes.

[0043] Please refer to Figure 2 and Figure 3 In the embodiment, the collecting mechanism 7 includes a guide rail 73, a sliding seat 72 is mounted on the guide rail 73, and a collecting box 71 is detachably mounted on the sliding seat 72. One side of the sliding seat 72 is connected with an even material driving motor 74, a fixed plate 75 is provided between the even material driving motor 74 and the guide rail 73, and the upper and lower ends of the fixed plate 75 are fixedly connected with the inner wall of the collecting chamber 6. A connecting rod 76 is slidably provided on the fixed plate 75, one end of the connecting rod 76 is connected with the sliding seat 72, the other end of the connecting rod 76 is provided with a push plate 77, an elastic element 761 is sleeved on the connecting rod 76, and the two ends of the elastic element 761 are respectively abutted with the fixed plate 75 and the push plate 77. A cam 741 is mounted on the output end of the even material driving motor 74.

[0044] It should be noted that since the debris generated by partial cutting is in a winding shape, and the diameters and shapes of various debris are quite different, the debris will generate a large gap after being put into the collecting box 71, which reduces the space utilization of the collecting box 71. Moreover, due to the blockage of the mounting column 23, the debris cannot fall into the area of the collecting box 71 located directly below the mounting column 23, which causes the area to be easily empty, affecting the space utilization. Therefore, the even material driving motor 74 is arranged to make the debris waste in the collecting box 71 accumulate more closely, so as to avoid frequent cleaning work of the collecting box 71.

[0045] In specific work, the even material driving motor 74 can drive the cam 741 to rotate to periodically contact and push the push plate 77, so that the connecting rod 76 slides on the fixed plate 75, the elastic element 761 is compressed when the push plate 77 is pushed by the cam 741, and the push plate 77 is reset when the cam 741 and the push plate 77 are disengaged, so as to drive the sliding seat 72 to make periodic reciprocating motion, so that the collecting box 71 is shaken to achieve the effect of even material, so that the scattered debris in the collecting box 71 is distributed more evenly and accumulated more closely, the space utilization of the collecting box 71 is improved, and frequent cleaning work of the collecting box 71 is avoided. Among them, the cam 741 is arranged to drive the sliding seat 72 to make reciprocating motion, which can greatly save the occupied space of the whole collecting mechanism 7.

[0046] It can be understood that during the cutting process, the uniform material driving motor 74 can intermittently drive the cam 741 to rotate, that is, after driving the cam 741 to rotate for a certain period of time, it is stopped, and after a certain period of time, it is driven to rotate again, which can also achieve the effect of uniform material, and the cam 741 does not need to be kept rotating during the cutting process, which can save certain operation cost.

[0047] Preferably, the elastic member 761 is selected from a spring, and in addition to this, other elastic parts that can be sleeved on the connecting rod 76 can also be selected.

[0048] Please refer to Figure 1 In the embodiment, the cabinet 1 is provided with a control panel 11 and a switch door 12, the machine tool is built-in with a control program, and each component can be controlled, the control panel 11 is used for enabling the staff to intelligently control the machine tool, the switch door 12 is used for opening the cabinet 1 to facilitate the installation of the workpiece 26 or the replacement of the cutting tool 312, and the switch door 12 is provided with a first observation window 13, and the machining condition inside the cabinet 1 can be observed in real time through the first observation window 13 during machining.

[0049] Please refer to Figure 1 In the embodiment, the collecting chamber 6 is provided with a material taking door 61, the collecting chamber 6 can be opened through the material taking door 61, so that the collecting box 71 is taken out, and the collected internal scrap is cleaned, and the material taking door 61 is provided with a second observation window 62, so that the staff can observe the scrap collecting condition of the internal collecting box 71 in real time.

[0050] Please refer to Figures 1 to 5 The specific operation steps and principles of the machine tool during use are as follows:

[0051] Firstly, the workpiece 26 to be machined is installed on the clamp 25, then the servo motor 231 is started to adjust the clamp 25 to a suitable direction, and then the lifting driving device 5 is started, the mounting frame 4 moves downward until the material blocking cover 42 contacts the annular baffle 27 and stops moving downward, then the rotating motor 31 drives the cutting tool 312 to rotate, and the linear driving member 34 drives the rotating motor 31 to move close to the workpiece 26 on the clamp 25 to cut, at the same time, the air inlet pipe 41 blows air towards the clamp 25 under the action of the external air pressure device during the cutting process, the scrap generated during the cutting process falls into the scrap channel 21 under the action of the wind force and the blocking effect of the material blocking cover 42, and is collected through the collecting box 71 below the scrap channel 21, and at the same time, the uniform material driving motor 74 intermittently drives the cam 741 to rotate during the cutting process, so that the collecting box 71 is shaken to make the internal scrap more tightly and uniformly accumulated.

[0052] Although the embodiments of the present application have been shown and described, it is to be understood that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present application, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A machine tool for cutting hardware, comprising a machine housing, characterized in that, The machine case is internally provided with a workbench, the workbench is provided with a rotating seat and two sets of cutting mechanisms, the two sets of cutting mechanisms are arranged on the two sides of the rotating seat, a clamp is installed on the rotating seat, a servo motor is connected to the bottom of the rotating seat, a waste channel is arranged around the side of the rotating seat, the waste channel penetrates the workbench in the vertical direction, a collecting chamber is arranged at the bottom of the machine case, a collecting mechanism is arranged in the collecting chamber, the collecting mechanism comprises a collecting box, the collecting box is located below the waste channel, the cutting mechanism comprises a rotating motor, an installation shaft connected to the output end of the rotating motor, and a cutting tool installed at the end of the installation shaft, a mounting rack is arranged above the clamp, a lifting driving device is connected to the top of the mounting rack, an air inlet pipe and a material blocking cover are installed on the mounting rack, the air outlet of the air inlet pipe faces the clamp, the material blocking cover is installed at the bottom of the mounting rack, and a clearance groove is arranged on the material blocking cover for accommodating the installation shaft.

2. The hardware cutting machine according to claim 1, characterized in that, A mounting column is arranged below the rotating seat, a cavity accommodating the servo motor is arranged in the mounting column, and a connecting rib is arranged on the side of the mounting column.

3. The hardware cutting machine of claim 1, wherein An annular baffle is arranged on the workbench, the annular baffle surrounds the outside of the waste channel, and the size of the annular baffle matches that of the material blocking cover.

4. The hardware cutting machine of claim 1, wherein The cutting mechanism further comprises a sliding rail and a linear driving member, a sliding block is slidably installed on the sliding rail, the linear driving member is connected to the sliding block, and the rotating motor is installed on the sliding block.

5. The hardware cutting machine of claim 1, wherein, The collecting mechanism comprises a guide rail, a sliding seat is installed on the guide rail, the collecting box is detachably installed on the sliding seat, a uniform material driving motor is connected to one side of the sliding seat, and the uniform material driving motor is used to drive the sliding seat to reciprocate along the guide rail.

6. The hardware cutting machine according to claim 5, wherein A fixing plate is arranged between the uniform material driving motor and the guide rail, a connecting rod is slidably arranged on the fixing plate, one end of the connecting rod is connected to the sliding seat, the other end of the connecting rod is provided with a pushing plate, an elastic member is sleeved on the connecting rod, and the two ends of the elastic member are respectively abutted with the fixing plate and the pushing plate.

7. The hardware cutting machine of claim 1, wherein, A cam is installed on the output end of the uniform material driving motor.

8. The hardware cutting machine of claim 1, wherein, A control panel and a switch door are arranged on the machine case, and a first observation window is arranged on the switch door. A second observation window is arranged on the collecting chamber.

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