Material returning mechanism of belt pulley punching die

Abstract

The utility model discloses a material returning mechanism of a belt pulley punching die, which comprises a U-shaped base, the top of the U-shaped base is fixedly provided with a belt pulley bottom die, the top of the U-shaped base is fixedly provided with a punching material returning mechanism matched with the belt pulley bottom die, and the inner wall of the bottom of the belt pulley bottom die is provided with a hidden hole. A groove is formed in the inner wall of the top of the U-shaped base, and a material returning and quick clearing mechanism is fixedly installed on the inner wall of the top of the groove. According to the utility model, a series of structures are arranged, so that the belt pulley can be conveniently and automatically returned in an elastic extrusion stripping manner after punching, and residues in the belt pulley bottom die can be conveniently and quickly cleaned and discharged after punching and material returning, so that the residues are prevented from influencing the processing of the next belt pulley; the punching and material returning work can be directly carried out on the next belt pulley again without manual independent cleaning by personnel, so that time and labor are saved, the use convenience is improved, and the personnel can use the belt pulley conveniently.

Description

Technical Field

[0001] The utility model relates to the technical field of pulley processing, in particular to a material return mechanism of a pulley punching die. Background Art

[0002] The pulley belongs to the hub type parts, which are generally relatively large in size. The manufacturing process is generally based on casting and forging. It is mainly used in the occasions of long-distance power transmission, including the output of small diesel engine power and the transmission of agricultural machinery power, etc. It also plays a great role in the operation of electric vehicles. In addition to the center hole, the pulley usually has side holes on the spokes of the pulley through a die punching machine to improve stability. After the punching process, the punch is easy to be tightly connected with the pulley when it rises, driving the pulley to rise as a whole, and the material cannot be effectively returned.

[0003] In this regard, after searching, publication number CN220092737U discloses an automatic stripping pulley punching die, including an upper template, a lower template, a guide column arranged on the lower template, a guide sleeve fixedly arranged on the upper template and adapted to the guide column, and a die base arranged on the upper template, the upper template is provided with a fixed plate, a tool plate fixedly arranged on the lower side of the fixed plate for installing a tool, and a stripping plate arranged below the tool plate and provided with a gap therewith, the fixed plate is also fixedly provided with a sliding column slidingly connected to the stripping plate in a vertical direction, the stripping plate is also provided with an elastic connecting member that elastically connects the stripping plate and the tool plate in a vertical direction; it enables relative movement between the stripping plate and the tool, the elastic connecting member has better elasticity and greater relative force, so that the unloading effect is better.

[0004] After the tool is raised, the above technology can use the elastic force of the spring and the stripping plate to squeeze the pulley away from the tool, thereby achieving the automatic stripping effect of the pulley after punching and cutting. However, the following problems need to be faced when using it: 1. After punching and stripping, the extrusion pressure of the stripping causes the pulley to fall into the lower die, and the residue formed by the punching will also vibrate and fall into the bottom die. The residue will lift and tilt the next pulley, affecting the stable progress of the punching work again. It is necessary for personnel to manually clean it separately before punching and stripping, which is time-consuming and labor-intensive, and the convenience of use is not ideal. In view of this, we propose a stripping mechanism for a pulley punching die to solve the above problems. Utility Model Content

[0005] The utility model aims to provide a material-returning mechanism for a pulley punching die to solve the problems raised in the above-mentioned background technology.

[0006] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: a material return mechanism of a pulley punching die, comprising a U-shaped base, a pulley bottom die is fixedly installed on the top of the U-shaped base, a punching and material return mechanism matched with the pulley bottom die is fixedly installed on the top of the U-shaped base, and the punching and material return mechanism is used to automatically return the material when the pulley is punched and raised after it is placed in the pulley bottom die;

[0007] A hidden hole is provided on the bottom inner wall of the pulley bottom die, a groove is provided on the top inner wall of the U-shaped base, a material return quick-clearing mechanism is fixedly installed on the top inner wall of the groove, the top of the material return quick-clearing mechanism extends into the hidden hole, slag discharge holes are provided on the four inner walls of the pulley bottom die, and the material return quick-clearing mechanism is used to quickly clean the pulley bottom die after the pulley is taken out, so as to prevent residual impurities from lifting the next pulley and affecting the normal operation of punching and material return;

[0008] The material return and quick cleaning mechanism includes a U-shaped support rod fixedly connected to the inner wall of the top of the groove, a sliding sleeve on the U-shaped support rod is provided with two guide sleeves, a vertical tube with a hood-shaped bottom structure is fixedly connected between the two guide sleeves, the top of the vertical tube extends into the hidden hole, and the U-shaped base sliding sleeve is arranged on the vertical tube. A reciprocating lifting and rotating assembly is fixedly connected between the inner walls on both sides of the U-shaped support rod, and a driving motor with an output shaft fixedly installed on the bottom inner wall of the U-shaped support rod is fixedly connected to the reciprocating lifting and rotating assembly. A rotary blowing assembly that penetrates the vertical tube and is rotatably mounted therewith is fixedly connected to the top of the reciprocating lifting and rotating assembly, and the top of the rotary blowing assembly extends into the hidden hole. The reciprocating lifting and rotating assembly is used to drive the rotary blowing assembly to reciprocate, lift and rotate and blow air when the driving motor is started, and the rotary blowing assembly is used to blow and clean the slag on the pulley bottom mold during lifting and rotary blowing.

[0009] Preferably, the punching and material stripping mechanism includes two guide rods fixedly connected to the top of the U-shaped base, the guide rods are slidingly sleeved with a guide tube, the two guide tubes are fixedly sleeved with an upper template, the two guide tubes are slidingly sleeved with the same material stripping plate, a plurality of springs are fixedly connected between the top of the material stripping plate and the bottom of the upper template, the bottom of the upper template is fixedly connected with a plurality of punching tools, the material stripping plate is movably sleeved on the plurality of punching tools, and the punching tools are located above the bottom template of the pulley; the upper template is driven downward by an external device, the upper template drives the material stripping plate to press down on the pulley through the spring, and is blocked and restricted by the pulley, the upper template that continues to move downward drives the punching tool to move downward to perform punching work, and compresses the spring, and after the upper template moves up, the elastic force of the spring in the compressed state is used to squeeze the pulley and the punching tool apart through the material stripping plate, thereby achieving the punching and material stripping effect.

[0010] Preferably, the reciprocating lifting and rotating assembly includes a reciprocating wire sleeve fixedly installed between the inner walls on both sides of the U-shaped support rod, the reciprocating wire sleeve is threaded with a reciprocating screw, the top end of the output shaft of the driving motor is fixedly connected to a square rod, and the reciprocating screw sliding sleeve is arranged on the square rod; the driving motor is used to drive the square rod to rotate, and the collapse of the square rod drives the reciprocating screw to rotate, and the reciprocating screw rotates and moves up and down in the reciprocating wire sleeve.

[0011] Preferably, the rotary blowing assembly includes a rotating shaft fixedly connected to the top of the reciprocating screw, the top of the rotating shaft passes through the vertical pipe, extends into the hidden hole and is fixedly connected to a rotary blowing pipe, both ends of the rotary blowing pipe are arranged to have a conical opening structure, the rotary blowing pipe is rotatably sleeved on the outer top of the vertical pipe, and a plurality of fan blades located in the vertical pipe are fixedly connected to the outer side of the rotating shaft; the reciprocating screw that rotates and reciprocates up and down drives the fan blades and the rotary blowing pipe to rotate and move reciprocally up and down through the rotating shaft, and when the fan blades rotate, air is blown into the rotary blowing pipe through the vertical pipe, and the air is blown into the bottom mold of the pulley through the rotary blowing pipe to blow and clean the slag, and the rotary blowing pipe can be retracted into the hidden hole after moving downward.

[0012] Preferably, a square slide groove is provided at the bottom end of the reciprocating screw, and the inner wall of the square slide groove is slidably fitted on the outer side of the square rod.

[0013] Preferably, a filter plate is fixedly connected to the bottom end of the vertical pipe, and the filter plate is rotatably sleeved on the rotating shaft.

[0014] Preferably, a vertical guide hole which is slidably fitted with the outer side of the vertical pipe is provided on the top inner wall of the groove.

[0015] Compared with the prior art, the beneficial effects of the utility model are:

[0016] 1. The material-removing mechanism of the pulley punching die can punch the pulley through the cooperation of the U-shaped base, the pulley bottom die and the punching and material-removing mechanism, and can automatically remove the pulley by elastic extrusion after punching;

[0017] 2. The material return mechanism of the pulley punching and cutting mold can quickly self-clean and discharge the residue in the pulley bottom mold after punching and cutting and returning the material through the cooperation of the set pulley bottom mold, slag discharge hole, hidden hole, U-shaped support rod, driving motor, vertical pipe, guide sleeve, reciprocating lifting and rotating component and rotary blowing component, and can hide the material return and quick cleaning mechanism after cleaning to prevent the next pulley from being blocked. The self-cleaning and discharge of the residue can prevent the residue from affecting the processing of the next pulley, and there is no need for personnel to manually clean it separately before punching and cutting and returning the material, and the punching and cutting and returning work can be directly carried out on the next pulley again, which saves time and effort and improves convenience of use.

[0018] The utility model is provided with a series of structures, which is convenient for automatically returning the pulley by elastic extrusion after punching and cutting, and is convenient for quickly self-cleaning and discharging the residue in the bottom mold of the pulley after punching and cutting, so as to prevent the residue from affecting the processing of the next pulley. There is no need for personnel to manually clean it separately before punching and cutting and returning the material, and the punching and cutting and returning work can be directly carried out on the next pulley again, which saves time and labor, improves ease of use, and is convenient for personnel to use. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 This is a schematic diagram of the main structure of a material-removing mechanism of a pulley punching die proposed by the utility model;

[0020] Figure 2 It is a cross-sectional structural schematic diagram of a material-removing mechanism of a pulley punching die proposed by the utility model;

[0021] Figure 3 For the utility model Figure 2 A schematic diagram of the enlarged structure of part A in the figure.

[0022] In the figure: 1. upper template; 101. material stripping plate; 102. punching tool; 104. guide tube; 105. guide rod; 106. spring; 2. U-shaped base; 3. pulley bottom mold; 4. slag discharge hole; 5. hidden hole; 6. U-shaped support rod; 7. guide sleeve; 8. filter plate; 9. fan blade; 10. vertical pipe; 11. driving motor; 12. rotary blowing tube; 13. square rod; 14. rotating shaft; 15. reciprocating wire sleeve; 16. reciprocating screw. DETAILED DESCRIPTION

[0023] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0024] like Figures 1 to 3 As shown, a material-removing mechanism of a pulley punching die proposed in this embodiment comprises a U-shaped base 2, a pulley bottom die 3 is fixedly mounted on the top of the U-shaped base 2, a punching and material-removing mechanism matched with the pulley bottom die 3 is fixedly mounted on the top of the U-shaped base 2, and the punching and material-removing mechanism is used to automatically remove the material when the pulley is punched and raised after being placed in the pulley bottom die 3;

[0025] The punching and stripping mechanism includes two guide rods 105 fixedly connected to the top of the U-shaped base 2, a guide tube 104 is slidably sleeved on the guide rod 105, an upper template 1 is fixedly sleeved on the two guide tubes 104, and the same stripping plate 101 is slidably sleeved on the two guide tubes 104, wherein the top of the stripping plate 101 is provided with two guide holes which are respectively slidably sleeved with the outer sides of the corresponding guide tubes 104, and the stripping plate 101 is slidably sleeved on the two guide tubes 104 through the two guide holes, which plays the effect of guiding the vertical sliding of the stripping plate 101, a plurality of springs 106 are fixedly connected between the top of the stripping plate 101 and the bottom of the upper template 1, a plurality of punching tools 102 are fixedly connected to the bottom of the upper template 1, and the stripping plate 101 is movably sleeved on the plurality of punching tools 102, wherein the top of the stripping plate 101 is provided with a plurality of The stripping plate 101 is movably mounted on the plurality of punching tools 102 through the plurality of tool perforations, and the punching tools 102 are located above the pulley bottom mold 3; the guide rod 105, the guide tube 104, the upper mold plate 1, the stripping plate 101, the spring 106 and the punching tool 102 are coordinated, and the upper mold plate 1 is driven downward by an external device, and the upper mold plate 1 is driven by the spring 106 to press the stripping plate 101 down on the pulley and is blocked and restricted by the pulley, and the upper mold plate 1 that continues to move downward drives the punching tool 102 to move downward for punching work, and compresses the spring 106. After the upper mold plate 1 moves up, the elastic force of the spring 106 in the compressed state is used to squeeze the pulley and the punching tool 102 through the stripping plate 101 to separate them, so as to achieve the punching and stripping effect;

[0026] A hidden hole 5 is provided on the bottom inner wall of the pulley bottom mold 3, a groove is provided on the top inner wall of the U-shaped base 2, a material return quick-clearing mechanism is fixedly installed on the top inner wall of the groove, the top of the material return quick-clearing mechanism extends into the hidden hole 5, slag discharge holes 4 are provided on the four side inner walls of the pulley bottom mold 3, and the material return quick-clearing mechanism is used to quickly clean the pulley bottom mold 3 after the pulley is taken out, so as to prevent residual impurities from lifting the next pulley and affecting the normal operation of the punching and material return work;

[0027] The material return quick cleaning mechanism includes a U-shaped support rod 6 fixedly connected to the inner wall of the top of the groove, and two guide sleeves 7 are provided on the sliding sleeve of the U-shaped support rod 6. A vertical tube 10 with a hood-shaped structure at the bottom is fixedly connected between the two guide sleeves 7. The top of the vertical tube 10 extends into the hidden hole 5. The U-shaped base 2 is slidably sleeved on the vertical tube 10, wherein a vertical guide hole that is slidably sleeved with the outer side of the vertical tube 10 is opened on the top inner wall of the groove, which plays an effect of guiding the vertical sliding of the vertical tube 10. A reciprocating lifting and rotating assembly is fixedly connected between the inner walls of both sides of the U-shaped support rod 6, and a driving motor 11 that is fixedly connected to the output shaft and the reciprocating lifting and rotating assembly is fixedly installed on the bottom inner wall of the U-shaped support rod 6. A rotary blowing assembly that penetrates the vertical tube 10 and is rotatably mounted therewith is fixedly connected to the top of the reciprocating lifting and rotating assembly. The top of the rotary blowing assembly extends into the hidden hole 5. The reciprocating lifting and rotating assembly is used to drive the rotary blowing assembly to reciprocate and lift and rotate and blow air when the driving motor 11 is started, and the rotary blowing assembly is used to blow and clean the slag on the pulley bottom mold 3 during lifting and rotary blowing.

[0028] The reciprocating lifting and rotating assembly includes a reciprocating wire sleeve 15 fixedly installed between the inner walls on both sides of the U-shaped support rod 6, wherein the inner walls on both sides of the U-shaped support rod 6 are respectively fixedly connected to the two sides of the reciprocating wire sleeve 15 with mounting rods, which play the effect of fixedly supporting the reciprocating wire sleeve 15, and the reciprocating wire sleeve 15 is internally threaded with a reciprocating screw 16, and the top end of the output shaft of the driving motor 11 is fixedly connected with a square rod 13, and the reciprocating screw 16 is slidably sleeved on the square rod 13, wherein the bottom end of the reciprocating screw 16 is provided with a square slide groove, and the inner wall of the square slide groove is connected to the reciprocating screw 16. The outer sliding sleeve of the square rod 13 utilizes the relationship of sliding sleeve connection of the square structural parts to facilitate the reciprocating screw 16 to rotate through the corners of the square slide groove when the square rod 13 rotates, and the reciprocating screw 16 can slide vertically on the square rod 13 through the square slide groove; the reciprocating wire sleeve 15, the reciprocating screw 16 and the square rod 13 are matched, and the square rod 13 is driven to rotate by the driving motor 11, and the square rod 13 is driven to rotate by the reciprocating screw 16, and the reciprocating screw 16 rotates and moves up and down in the reciprocating wire sleeve 15;

[0029] The rotary blowing assembly includes a rotating shaft 14 fixedly connected to the top of the reciprocating screw 16, the top of the rotating shaft 14 passes through the vertical pipe 10, extends into the hidden hole 5 and is fixedly connected to a rotary blowing tube 12, both ends of the rotary blowing tube 12 are arranged to have a conical opening structure, the rotary blowing tube 12 is rotatably sleeved on the outer top of the vertical pipe 10, wherein a rotating hole is opened on the bottom inner wall of the rotary blowing tube 12, a first bearing is fixedly sleeved in the rotating hole, the inner ring of the first bearing is fixedly sleeved on the outer top of the vertical pipe 10, which has the effect of rotatably installing the rotary blowing tube 12, a plurality of fan blades 9 located in the vertical pipe 10 are fixedly connected to the outer side of the rotating shaft 14, the bottom end of the vertical pipe 10 is fixedly connected to a filter plate 8, the filter plate 8 is rotatably sleeved on the rotating shaft 14, and the filter plate 8 arranged at the bottom plays the role of The filter plate 8 has the effect of filtering and blocking external impurities, wherein a circular hole is opened on the top of the filter plate 8, and a support bearing is fixedly sleeved in the circular hole, and the inner ring of the support bearing is fixedly sleeved on the outer side of the rotating shaft 14, which plays the effect of rotatably installing the rotating shaft 14; the rotating shaft 14, the rotary blowing tube 12 and the fan blades 9 are coordinated, and the reciprocating screw 16 that rotates and moves back and forth up and down drives the rotating shaft 14 to rotate and move back and forth up and down, and the rotating shaft 14 drives the fan blades 9 and the rotary blowing tube 12 to rotate and move back and forth up and down. When the fan blades 9 rotate, air is blown into the rotary blowing tube 12 through the vertical tube 10, and the wind is blown into the pulley bottom mold 3 through the rotating and upward rotary blowing tube 12 to blow and clean the slag. After the rotary blowing tube 12 moves down, it can be retracted into the hidden hole 5 to perform hidden anti-blocking work.

[0030] The method of using this embodiment is as follows: the pulley is placed in the pulley bottom mold 3, and the upper mold plate 1 is driven downward by an external device. The upper mold plate 1 drives the guide tube 104 to slide downward on the corresponding guide rod 105, and the upper mold plate 1 drives the stripping plate 101 to press down on the pulley through the spring 106. The stripping plate 101 is blocked and restricted by the pulley. At this time, the upper mold plate 1 that continues to move downward drives the punching tool 102 to move downward for punching and compresses the spring 106. When the punching is completed, when the upper mold plate 1 moves upward, the elastic force of the spring 106 in the compressed state squeezes the stripping plate 101 downward, and the stripping plate 101 squeezes the pulley and the punching tool 102 to separate, thereby achieving the effect of automatic material stripping after punching.

[0031] After the material is returned, the personnel takes out the pulley and starts the drive motor 11. The drive motor 11 drives the square rod 13 to rotate. The square rod 13 drives the reciprocating screw 16 to rotate through the square slide slot. The reciprocating screw 16 rotates and moves up and down in the reciprocating screw sleeve 15. At this time, the reciprocating screw 16 slides up and down on the square rod 13, and the reciprocating screw 16 drives the rotating shaft 14 to rotate and move back and forth up and down. The rotating shaft 14 drives the fan blades 9 and the rotary blowing tube 12 to rotate and move back and forth up and down. When the rotary blowing tube 12 rotates and moves upward, it will rise into the pulley bottom mold 3. When the fan blades 9 rotate, they pass through the vertical The tube 10 blows air into the rotary blowing tube 12, and the wind is blown into the pulley bottom mold 3 through the rotating and upward moving rotary blowing tube 12 for blowing and cleaning. The residue is blown out through the four slag discharge holes 4, and the rotary blowing tube 12 can be retracted into the hidden hole 5 after moving downward to perform hidden anti-blocking work, thereby achieving the effect of quickly self-cleaning and discharging the residue after punching and cutting, preventing the residue from affecting the processing of the next pulley, and there is no need for personnel to manually clean it separately before punching and cutting and cutting, and the next pulley can be punched and cut again, which saves time and effort and improves convenience of use.

[0032] Finally, it should be noted that the above description is only a preferred embodiment of the utility model and is not intended to limit the utility model. Although the utility model is described in detail with reference to the above embodiments, those skilled in the art can still modify the technical solutions recorded in the above embodiments or replace some of the technical features therein with equivalents. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the utility model shall be included in the protection scope of the utility model.

Claims

1. A material removal mechanism for a pulley punching die, comprising a U-shaped base (2), characterized in that: A pulley bottom die (3) is fixedly mounted on the top of the U-shaped base (2), and a punching and material-removing mechanism matched with the pulley bottom die (3) is fixedly mounted on the top of the U-shaped base (2); A hidden hole (5) is provided on the bottom inner wall of the pulley bottom mold (3); a groove is provided on the top inner wall of the U-shaped base (2); a material return and quick cleaning mechanism is fixedly installed on the top inner wall of the groove; the top of the material return and quick cleaning mechanism extends into the hidden hole (5); and slag discharge holes (4) are provided on the four inner walls of the pulley bottom mold (3); The material return quick-clearing mechanism comprises a U-shaped support rod (6) fixedly connected to the inner wall of the top of the groove, two guide sleeves (7) are slidably sleeved on the U-shaped support rod (6), a vertical tube (10) with a hood-shaped bottom structure is fixedly connected between the two guide sleeves (7), the top of the vertical tube (10) extends into the hidden hole (5), the U-shaped base (2) is slidably sleeved on the vertical tube (10), a reciprocating lifting and rotating assembly is fixedly connected between the inner walls on both sides of the U-shaped support rod (6), a driving motor (11) whose output shaft is fixedly connected to the reciprocating lifting and rotating assembly is fixedly installed on the inner wall of the bottom of the U-shaped support rod (6), a spinning and blowing assembly that penetrates the vertical tube (10) and is rotatably installed therewith is fixedly connected to the top of the reciprocating lifting and rotating assembly, and the top of the spinning and blowing assembly extends into the hidden hole (5).

2. The material-removing mechanism of a pulley punching die according to claim 1, characterized in that: The punching and material-removing mechanism comprises two guide rods (105) fixedly connected to the top of the U-shaped base (2); a guide tube (104) is slidably sleeved on the guide rod (105); an upper template (1) is fixedly sleeved on the two guide tubes (104); a same material-removing plate (101) is slidably sleeved on the two guide tubes (104); a plurality of springs (106) are fixedly connected between the top of the material-removing plate (101) and the bottom of the upper template (1); a plurality of punching tools (102) are fixedly connected to the bottom of the upper template (1); the material-removing plate (101) is movably sleeved on the plurality of punching tools (102); and the punching tools (102) are located above the pulley bottom template (3).

3. The material-removing mechanism of a pulley punching die according to claim 1, characterized in that: The reciprocating lifting and rotating assembly comprises a reciprocating thread sleeve (15) fixedly mounted between the inner walls of both sides of the U-shaped support rod (6), the reciprocating thread sleeve (15) is internally threaded with a reciprocating screw (16), the top end of the output shaft of the driving motor (11) is fixedly connected to a square rod (13), and the reciprocating screw (16) is slidably sleeved on the square rod (13).

4. The material-removing mechanism of the pulley punching die according to claim 3, characterized in that: The rotary blowing assembly comprises a rotating shaft (14) fixedly connected to the top end of a reciprocating screw (16); the top end of the rotating shaft (14) penetrates the vertical tube (10) and extends into the hidden hole (5) and is fixedly connected to a rotary blowing tube (12); both ends of the rotary blowing tube (12) are arranged to have a conical opening structure; the rotary blowing tube (12) is rotatably sleeved on the outer top of the vertical tube (10); and the outer side of the rotating shaft (14) is fixedly connected to a plurality of fan blades (9) located in the vertical tube (10).

5. The material-removing mechanism of a pulley punching die according to claim 3, characterized in that: A square slide groove is provided at the bottom end of the reciprocating screw (16), and the inner wall of the square slide groove is slidably mounted on the outer side of the square rod (13).

6. The material-removing mechanism of a pulley punching die according to claim 4, characterized in that: The bottom end of the vertical pipe (10) is fixedly connected with a filter plate (8), and the filter plate (8) is rotatably sleeved on a rotating shaft (14).

7. The material-removing mechanism of a pulley punching die according to claim 1, characterized in that: A vertical guide hole is provided on the top inner wall of the groove and is slidably fitted onto the outer side of the vertical pipe (10).

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