Inner and outer circle machining grinding machine

Abstract

The invention discloses an inner and outer circle machining grinding machine, and relates to the technical field of intelligent manufacturing equipment industry grinding machines. The inner and outer circle machining grinding machine comprises a base, a three-jaw chuck module, an inner circle grinding module and an outer circle grinding module, the inner circle grinding module and the outer circle grinding module comprise grinding wheels, and the inner circle grinding module is provided with a first cleaning mechanism used for cleaning chippings in an inner hole of a workpiece; the first cleaning mechanism comprises a moving plate, the moving plate is connected with the inner circle grinding module through a reset mechanism, the bottom of the moving plate is connected with a first dust suction pipe through a lifting mechanism, a dust suction mechanism is arranged on the inner circle grinding module, and the moving plate is pushed to move through a pushing mechanism. According to the inner and outer circle machining grinding machine, chippings in an inner hole of a workpiece can be conveniently absorbed and cleaned, dust collection and cleaning can be conveniently carried out on pores in the surface of the grinding wheel and the attached chippings, and the grinding quality can be improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of intelligent manufacturing equipment industry grinding machine, in particular to an inner and outer circle processing grinding machine. BACKGROUND

[0002] The inner and outer circle processing grinding machine adopts a numerical control system, realizes high-precision grinding of inner and outer circles and end faces by accurately controlling the feed of the grinding wheel, the rotation of the workpiece and the movement of the workbench, and belongs to the intelligent manufacturing equipment industry. The machine tool is equipped with automatic measurement, grinding wheel automatic dressing and other auxiliary functions, which greatly improves the processing efficiency and precision. It is suitable for grinding the inner and outer circles and end faces of complex parts such as shafts, sleeves and discs, and is widely used in the fields of automobiles, aerospace, molds and precision instruments. The numerical control inner and outer circle compound grinding machine has become an important equipment in modern manufacturing industry due to its excellent processing performance, stable running state and convenient operation interface, helping enterprises to improve product quality and production efficiency.

[0003] However, the existing inner and outer circle processing grinding machine has the problem that when the inner hole is polished, the polishing debris will remain in the inner hole and is not easy to clean, thereby affecting the polishing quality. SUMMARY

[0004] The purpose of the present application is to provide an inner and outer circle processing grinding machine to solve the problems raised in the background art.

[0005] To achieve the above purpose, the present application provides the following technical scheme: an inner and outer circle processing grinding machine, comprising a base, a three-jaw chuck module, an inner circle grinding module and an outer circle grinding module, and the inner circle grinding module and the outer circle grinding module comprise a grinding wheel, a first cleaning mechanism for cleaning the debris in the inner hole of the workpiece is arranged on the inner circle grinding module; The first cleaning mechanism comprises a moving plate, and the moving plate is connected to the inner circle grinding module through a reset mechanism, the bottom of the moving plate is connected to a first dust collection pipe through a lifting mechanism, a dust collection mechanism is arranged on the inner circle grinding module, and the movement of the moving plate is pushed by a pushing mechanism.

[0006] Preferably, the lifting mechanism comprises a lifting block fixedly arranged on the side wall of the first dust collection pipe, a plurality of balls are arranged on the bottom of the lifting block, and the lifting block is connected to the bottom of the moving plate through a telescopic mechanism, and the lifting of the lifting block is pushed by a pushing piece.

[0007] Preferably, the pushing piece comprises an inclined plate fixedly connected to the side wall of the lifting block.

[0008] Preferably, the telescopic mechanism comprises two first sleeve rods symmetrically arranged on the top of the lifting block, a first sleeve is arranged on the side wall of each first sleeve rod, the upper end of the first sleeve is fixed to the bottom of the moving plate, and the first sleeve rod is connected to the first sleeve through a first spring.

[0009] Preferably, the dust collection mechanism comprises a fixed block fixedly connected to the inner grinding module, and the side wall of the fixed block is fixedly connected with an electromagnetic valve, the inlet of the electromagnetic valve is fixedly connected with a fixed pipe, and the other end of the fixed pipe is fixedly connected with a filter module, the filter module is communicated with the first dust collection pipe through a first telescopic pipe, and the base is provided with an air extraction assembly for extracting air from the fixed pipe.

[0010] Preferably, the air extraction assembly comprises a support plate fixedly connected to the base, and the side wall of the support plate is fixedly connected with an air extractor, and the air extractor is communicated with the electromagnetic valve through a hose.

[0011] Preferably, the first reset mechanism comprises two symmetrical second sleeves fixedly connected to the side wall of the moving plate, and a second sleeve rod is inserted into each second sleeve, the other end of the second sleeve rod is connected with the inner grinding module, and the second sleeve rod is connected with the second sleeve through a second spring.

[0012] Preferably, the pushing mechanism comprises a fixed box fixedly inserted into the side wall of the fixed pipe, and the top of the fixed box is rotatably connected with a cam through a rotating shaft, the side wall of the moving plate is fixedly connected with a pushing block, so that the cam can slide on the side wall of the pushing block, and the rotation of the rotating shaft is driven by the driving assembly.

[0013] Preferably, the driving assembly comprises a rotating fan arranged in the fixed box, and the rotating fan is rotatably connected with the inner wall of the fixed box through a driving shaft, and the upper end of the driving shaft is fixed with the lower end of the rotating shaft.

[0014] Preferably, the top of the moving plate is provided with a second cleaning mechanism for absorbing and cleaning the debris on the grinding wheel, and the second cleaning mechanism comprises a second dust collection pipe fixedly inserted into the top of the moving plate, and the second dust collection pipe is communicated with the first dust collection pipe through a second telescopic pipe.

[0015] Compared with the prior art, the beneficial effects of the present application are: The inner and outer circle processing grinding machine is provided with a lifting mechanism, and when the inner hole is ground, the grinding wheel is moved to the inner hole of the workpiece through the inner grinding module, and when the inclined plate abuts against the end face of the inner hole, the lifting block is pushed upward, the first sleeve rod moves into the first sleeve tube, and the first spring is compressed. When the lifting block moves into the inner hole, the ball abuts against the bottom of the inner hole under the action of the first spring, so that the height of the first dust collection pipe can be automatically adjusted according to the size of the inner hole, the distance between the first dust collection pipe and the bottom of the inner hole is constant, and the efficiency and effect of subsequent dust collection and cleaning are guaranteed.

[0016] The inner and outer circle processing grinding machine, through the setting first cleaning mechanism, after the automatic adjustment is completed, the workpiece can be rotated by the three-jaw chuck module, and the inner hole can be polished by the grinding wheel, at the same time, during polishing, the air extractor is started to perform air extraction operation, and the electromagnetic valve is opened, at this time, the fixed pipe can perform air extraction operation, and the first telescopic pipe and the first dust collection pipe can perform air extraction operation, so that the first dust collection pipe can absorb and clean the debris after the inner hole is polished, which is more convenient and fast, and can improve the polishing quality.

[0017] The inner and outer circle processing grinding machine, through the setting second cleaning mechanism, when the first dust collection pipe performs air extraction and dust collection, the second telescopic pipe can make the second dust collection pipe perform air extraction, so that the surface pores and adhered debris of the grinding wheel can be dusted and cleaned, and the polishing quality can be improved, and the absorbed debris can enter the filtering module through the first telescopic pipe for collection.

[0018] The inner and outer circle processing grinding machine, through the setting pushing mechanism, when dust collection and cleaning are performed, the filtered air can enter the fixed box and impact the surface of the rotating fan, so that the rotating fan rotates, when the rotating fan rotates, the driving shaft rotates, and the cam rotates through the rotating shaft, when the tip of the cam abuts against the side wall of the pushing block, the pushing block and the moving plate can be pushed to move, at the same time, the second sleeve slides along the side wall of the second sleeve rod, and the second spring is stretched, when the tip of the cam passes the side wall of the pushing block, the pushing block and the moving plate can be moved and reset under the action of the second spring, so that the moving plate moves back and forth, and the second dust collection pipe and the first dust collection pipe move back and forth, so that the absorption and cleaning efficiency of the debris in the grinding wheel and the inner hole is higher and the effect is better, and the impact force of air flow can be used as power without using additional power module, which is more convenient and energy-saving. BRIEF DESCRIPTION OF DRAWINGS

[0019] Figure 1 It is the overall structure schematic diagram of the present application; Figure 2 It is the overall structure schematic diagram of another perspective of the present application; Figure 3 It is the position schematic diagram of the first cleaning mechanism in the present application; Figure 4 It is the partial sectional structure schematic diagram of the fixed box in the present application; Figure 5 It is the structure schematic diagram of the air extraction assembly in the present application; Figure 6 It is Figure 1 It is the enlarged structure schematic diagram of A in the present application; Figure 7 It is Figure 3 It is the enlarged structure schematic diagram of B in the present application.

[0020] In the figure: 101, base; 102, three-jaw chuck module; 103, inner circle grinding module; 104, outer circle grinding module; 105, grinding wheel; 201, moving plate; 202, first dust suction pipe; 301, second dust suction pipe; 302, second telescopic pipe; 401, lifting block; 402, ball; 403, inclined plate; 501, first sleeve; 502, first sleeve rod; 601, fixed block; 602, electromagnetic valve; 603, fixed pipe; 604, filtering module; 605, first telescopic pipe; 701, second sleeve; 702, second sleeve rod; 801, fixed box; 802, rotating shaft; 803, cam; 804, pushing block; 901, driving shaft; 902, rotating fan; 1001, support plate; 1002, hose; 1003, air extractor. DETAILED DESCRIPTION

[0021] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings 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. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work fall within the scope of protection of the present application.

[0022] Please refer to Figures 1-7 The present application provides an inner and outer circle processing grinding machine, which comprises a base 101, a three-jaw chuck module 102, an inner circle grinding module 103 and an outer circle grinding module 104, and the inner circle grinding module 103 and the outer circle grinding module 104 comprise a grinding wheel 105, the structure and principle of which are known in the art and are not described here, and the inner circle grinding module 103 is provided with a first cleaning mechanism for cleaning the debris in the inner hole of the workpiece. The first cleaning mechanism comprises a moving plate 201, and the moving plate 201 is connected with the inner circle grinding module 103 through a reset mechanism, the bottom of the moving plate 201 is connected with a first dust suction pipe 202 through a lifting mechanism, the inner circle grinding module 103 is provided with a dust suction mechanism, and the movement of the moving plate 201 is pushed by a pushing mechanism, so as to facilitate the absorption and cleaning of the debris in the inner hole of the workpiece, and facilitate the dust suction and cleaning of the surface pores and adhered debris of the grinding wheel 105, and improve the quality of polishing.

[0023] The lifting mechanism comprises a lifting block 401 fixedly sleeved on the side wall of the first dust suction pipe 202, the bottom of the lifting block 401 is provided with a plurality of balls 402, and the lifting block 401 is connected with the bottom of the moving plate 201 through a telescopic mechanism, and the lifting of the lifting block 401 is pushed by a pushing piece.

[0024] The pushing member comprises an inclined plate 403 fixedly connected to the side wall of the lifting block 401, and the inclined plate 403 can push the lifting block 401 to move upward when the inclined plate 403 abuts against the end surface of the inner hole.

[0025] The telescopic mechanism comprises two symmetrically arranged first sleeve rods 502 fixedly connected to the top of the lifting block 401, and the side wall of each first sleeve rod 502 is sleeved with a first sleeve tube 501, the upper end of the first sleeve tube 501 is fixed to the bottom of the moving plate 201, and the first sleeve rod 502 is connected to the first sleeve tube 501 through a first spring, thereby guiding and resetting the movement of the lifting block 401.

[0026] The dust collection mechanism comprises a fixed block 601 fixedly connected to the inner circle grinding module 103, and the side wall of the fixed block 601 is fixedly connected with an electromagnetic valve 602, the inlet of the electromagnetic valve 602 is fixedly connected with a fixed tube 603, and the other end of the fixed tube 603 is fixedly connected with a filter module 604, which is a known technology in the technical field and will not be described here, the filter module 604 is communicated with the first dust collection tube 202 through a first telescopic tube 605, and the base 101 is provided with an air extraction assembly for extracting air from the fixed tube 603, the fixed tube 603 is extracted by the air extraction assembly, and then the first telescopic tube 605 and the first dust collection tube 202 are extracted, so that the first dust collection tube 202 can absorb and clean the debris after the inner hole is ground, which is more convenient and efficient, and can improve the grinding quality, and the absorbed debris can be collected in the filter module 604 through the first telescopic tube 605.

[0027] The air extraction assembly comprises a supporting plate 1001 fixedly connected to the base 101, and the side wall of the supporting plate 1001 is fixedly connected with an air extractor 1003, the air extractor 1003 is communicated with the electromagnetic valve 602 through a hose 1002, the air extractor 1003 is started to extract air, and the electromagnetic valve 602 is opened, at this time, the hose 1002 and the fixed tube 603 can be used to extract air.

[0028] The first reset mechanism comprises two symmetrically arranged second sleeve tubes 701 fixedly connected to the side wall of the moving plate 201, and a second sleeve rod 702 is inserted into each second sleeve tube 701, the other end of the second sleeve rod 702 is connected to the inner circle grinding module 103, and the second sleeve rod 702 is connected to the second sleeve tube 701 through a second spring, thereby guiding and resetting the movement of the moving plate 201.

[0029] The pushing mechanism comprises a fixed box 801 fixedly inserted in the side wall of the fixed tube 603, and the top of the fixed box 801 is rotationally connected with a cam 803 through a rotating shaft 802, and the side wall of the moving plate 201 is fixedly connected with a pushing block 804, so that the cam 803 can slide on the side wall of the pushing block 804, and the rotation of the rotating shaft 802 is driven by the driving assembly, and the rotating shaft 802 is driven to rotate by the driving assembly, at the same time, the cam 803 is driven to rotate, when the tip of the cam 803 abuts against the side wall of the pushing block 804, the pushing block 804 and the moving plate 201 can be pushed to move.

[0030] The driving assembly comprises a rotating fan 902 arranged in the fixed box 801, the rotating fan 902 is rotationally connected with the inner wall of the fixed box 801 through a driving shaft 901, and the upper end of the driving shaft 901 is fixed with the lower end of the rotating shaft 802, the filtered air can enter the fixed box 801 and impact the surface of the rotating fan 902, so that the rotating fan 902 rotates, when the rotating fan 902 rotates, the driving shaft 901 is driven to rotate, and the cam 803 is driven to rotate through the rotating shaft 802.

[0031] The top of the moving plate 201 is provided with a second cleaning mechanism for absorbing and cleaning the debris on the grinding wheel 105, the second cleaning mechanism comprises a second dust suction pipe 301 fixedly inserted in the top of the moving plate 201, and the second dust suction pipe 301 is communicated with the first dust suction pipe 202 through a second telescopic pipe 302, when the first dust suction pipe 202 performs air suction, the second dust suction pipe 301 can be suctioned through the second telescopic pipe 302, so that the surface pores and adhered debris of the grinding wheel 105 can be suctioned and cleaned, and the polishing quality can be improved.

[0032] Working principle: when in use, before starting the equipment for processing operation, comprehensive preparation work needs to be completed to ensure the stability and accuracy of the processing process. First of all, the entire inner and outer circle processing grinding machine is systematically checked, and the fixing state of the base 101 is checked, to ensure that the equipment is placed stably without loosening or shaking, which is the basis for ensuring the processing accuracy; then, the integrity and flexibility of the clamping jaw of the three-jaw chuck module 102 are checked, whether the running track of the inner circle grinding module 103 and the outer circle grinding module 104 is smooth, whether the surface of the grinding wheel 105 has problems such as damage, crack or excessive wear, etc., if abnormal, it needs to be replaced or repaired in time; at the same time, it is confirmed whether the connection of the dust suction mechanism, the cleaning mechanism and other auxiliary components is firm, whether the key elements such as the electromagnetic valve 602 and the air suction machine 1003 are in the normal standby state.

[0033] After the preparation is completed, the workpiece clamping operation is performed. According to the size and shape characteristics of the workpiece to be processed, the jaw spacing of the three-jaw chuck module 102 is adjusted, the workpiece is stably placed in the center position of the chuck, and the workpiece axis is ensured to coincide with the spindle axis of the grinding machine to avoid processing deviation caused by eccentric clamping. Start the clamping function of the three-jaw chuck, uniformly apply clamping force, both to ensure that the workpiece does not shift or rotate during processing, and to prevent excessive clamping force from causing workpiece deformation, especially for thin-walled and precision workpieces, precise control of clamping force is required, and if necessary, soft pads can be installed between the jaws and the workpiece contact surface for protection. After clamping is completed, manually rotate the workpiece to check if it rotates smoothly without jamming or abnormal noise. After confirming that the clamping is correct, the subsequent processing process can be entered.

[0034] When performing inner circle polishing operation, input the processing parameters through the numerical control system of the inner circle grinding module 103, including inner hole diameter, polishing depth, grinding wheel 105 speed, etc. The system will automatically control the inner circle grinding module 103 to drive the grinding wheel 105 to move towards the workpiece, gradually approaching and entering the workpiece hole. In this process, the inclined plate 403 on the side wall of the lifting block 401 connected with the first dust collection pipe 202 first contacts the end face of the workpiece inner hole. With the continuous advancement of the inner circle grinding module 103, the inclined plate 403 is resisted by the end face of the inner hole. The force is decomposed into an upward thrust along the inclined surface of the inclined plate 403, which pushes the lifting block 401 upward, at the same time, the first sleeve rod 502 moves towards the first sleeve pipe 501, the first spring is compressed, and when the lifting block 401 moves to the inner hole, the first spring is compressed, the ball 402 is in contact with the bottom of the inner hole, so as to automatically adjust the height of the first dust collection pipe 202 according to the size of the inner hole, ensure that the distance between the first dust collection pipe 202 and the bottom of the inner hole is constant, and ensure the efficiency and effect of subsequent dust collection and cleaning.

[0035] After the automatic adjustment is completed, the workpiece can be rotated by the three-jaw chuck module 102, and the inner hole can be polished by the grinding wheel 105. At the same time, during polishing, start the air extractor 1003 for air extraction operation, and open the electromagnetic valve 602. At this time, the air extraction operation can be performed through the fixed pipe 603, and then through the first telescopic pipe 605 and the first dust collection pipe 202 to enable the first dust collection pipe 202 to absorb and clean the debris after the inner hole is polished, which is more convenient and efficient, and can improve the polishing quality.

[0036] At the same time, when the first dust collection pipe 202 performs air extraction and dust collection, the second telescopic pipe 302 enables the second dust collection pipe 301 to perform air extraction, so as to perform dust collection and cleaning on the surface pores and adhered debris of the grinding wheel 105, and also improve the polishing quality. The absorbed debris can enter the filtering module 604 through the first telescopic pipe 605 for collection.

[0037] And, in the dust cleaning, the filtered air can enter the fixed box 801 and impact the surface of the fan 902, so that the fan 902 rotates, when the fan 902 rotates, the drive shaft 901 can be driven to rotate, and the cam 803 is driven to rotate through the rotating shaft 802, when the tip of the cam 803 abuts the side wall of the push block 804, the push block 804 and the moving plate 201 can be pushed to move, at the same time, the second sleeve 701 slides along the side wall of the second sleeve rod 702, the second spring is stretched, when the tip of the cam 803 passes the side wall of the push block 804, the push block 804 and the moving plate 201 can be reset under the action of the second spring, so as to reciprocate, so that the moving plate 201 reciprocates, and the second dust collection pipe 301 and the first dust collection pipe 202 reciprocate, so that the efficiency of absorbing and cleaning the debris in the hole and the grinding wheel 105 is higher and the effect is better, and the impact force of air flow can be used as power, without using additional power module, more convenient and energy-saving.

[0038] The standard parts used in the present application can be purchased from the market, and the special-shaped parts can be ordered according to the description and the drawings. The specific connection mode of each part adopts the conventional means such as bolts, rivets and welding in the prior art. The mechanical parts and equipment adopt conventional models in the prior art. The circuit connection adopts the conventional connection mode in the prior art, which will not be described in detail here. The contents not described in detail in the specification belong to the prior art known to those skilled in the art. The above describes the present application and its embodiments, which is not restrictive. The drawings only show one embodiment of the present application, and the actual structure is not limited thereto. In general, if a person skilled in the art is inspired by it, without departing from the purpose of the present application, without creative design, similar structure and embodiments of the technical solution can be designed, which should belong to the protection scope of the present application.

Claims

1. A grinding machine for internal and external cylindrical machining, comprising a base (101), a three-jaw chuck module (102), an internal cylindrical grinding module (103), and an external cylindrical grinding module (104), wherein the internal cylindrical grinding module (103) and the external cylindrical grinding module (104) include grinding wheels (105), characterized in that: The grinding inner circle module (103) is provided with a first cleaning mechanism for cleaning debris inside the workpiece inner hole; The first cleaning mechanism includes a movable plate (201), and the movable plate (201) is connected to the inner grinding circle module (103) through a reset mechanism. The bottom of the movable plate (201) is connected to a first dust suction pipe (202) through a lifting mechanism. The inner grinding circle module (103) is provided with a dust suction mechanism, and the movement of the movable plate (201) is driven by a pushing mechanism.

2. The grinding machine for internal and external cylindrical machining according to claim 1, characterized in that: The lifting mechanism includes a lifting block (401) fixedly sleeved on the side wall of the first vacuum pipe (202). The bottom of the lifting block (401) is provided with multiple ball bearings (402), and the lifting block (401) is connected to the bottom of the moving plate (201) through a telescopic mechanism. The lifting of the lifting block (401) is driven by a pusher.

3. A grinding machine for machining internal and external cylinders according to claim 2, characterized in that: The pusher includes an inclined plate (403) fixedly connected to the side wall of the lifting block (401).

4. A grinding machine for machining internal and external cylinders according to claim 3, characterized in that: The telescopic mechanism includes two symmetrically arranged first sleeve rods (502) fixedly connected to the top of the lifting block (401), and each first sleeve rod (502) has a first sleeve (501) sleeved on its side wall. The upper end of the first sleeve (501) is fixed to the bottom of the moving plate (201), and the first sleeve rod (502) is connected to the first sleeve (501) by a first spring.

5. A grinding machine for machining internal and external cylinders according to claim 1, characterized in that: The dust collection mechanism includes a fixed block (601) fixedly connected to the inner circle module (103) of the grinding mill, and a solenoid valve (602) fixedly connected to the side wall of the fixed block (601). A fixed pipe (603) is fixedly connected to the inlet of the solenoid valve (602), and a filter module (604) is fixedly connected to the other end of the fixed pipe (603). The filter module (604) is connected to the first dust collection pipe (202) through the first telescopic pipe (605), and a suction component for drawing air from the fixed pipe (603) is provided on the base (101).

6. A grinding machine for internal and external cylindrical machining according to claim 5, characterized in that: The exhaust assembly includes a support plate (1001) fixedly connected to the base (101), and an exhaust fan (1003) is fixedly connected to the side wall of the support plate (1001). The exhaust fan (1003) is connected to the solenoid valve (602) through a hose (1002).

7. A grinding machine for machining internal and external cylinders according to claim 1, characterized in that: The first reset mechanism includes two symmetrically arranged second sleeves (701) fixedly connected to the side wall of the movable plate (201), and a second sleeve rod (702) is inserted into each second sleeve (701). The other end of the second sleeve rod (702) is connected to the grinding inner circle module (103), and the second sleeve rod (702) is connected to the second sleeve (701) through a second spring.

8. A grinding machine for machining internal and external cylinders according to claim 5, characterized in that: The pushing mechanism includes a fixed box (801) fixedly inserted into the side wall of the fixed tube (603), and a cam (803) is rotatably connected to the top of the fixed box (801) via a rotating shaft (802). A pushing block (804) is fixedly connected to the side wall of the moving plate (201), so that the cam (803) can slide on the side wall of the pushing block (804), and the rotation of the rotating shaft (802) is driven by a driving assembly.

9. A grinding machine for internal and external cylindrical machining according to claim 8, characterized in that: The drive assembly includes a rotating fan (902) disposed in a fixed box (801). The rotating fan (902) is rotatably connected to the inner wall of the fixed box (801) via a drive shaft (901), and the upper end of the drive shaft (901) is fixed to the lower end of the rotating fan (802).

10. A grinding machine for machining internal and external cylinders according to claim 1, characterized in that: The top of the movable plate (201) is provided with a second cleaning mechanism for absorbing and cleaning debris on the grinding wheel (105). The second cleaning mechanism includes a second suction pipe (301) fixedly inserted into the top of the movable plate (201), and the second suction pipe (301) is connected to the first suction pipe (202) through a second telescopic pipe (302).

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