Waste recycling device for frequency converter machining

Abstract

The invention relates to the technical field of frequency converters, and discloses a frequency converter machining waste recycling device which comprises a screening mechanism, the screening mechanism comprises a smashing box, a sliding frame is arranged on the inner wall of the smashing box, and a classification box is fixedly connected to the bottom of the smashing box; a collecting bin is slidably connected to the end, away from the smashing box, of the classifying box, a supporting frame fixedly sleeves the outer wall of the end, close to the collecting bin, of the classifying box, supporting legs are fixedly connected to the outer wall of the bottom of the supporting frame, and a box door is rotatably connected to the outer wall of the left side of the smashing box through a hinge; in the working process of recovering the processing waste of the frequency converter, the frequency converter is crushed by virtue of the crushing mechanism, and then plastic and metal particle components contained in the waste are screened and separated by virtue of the screening mechanism, so that the recycling efficiency of the waste can be effectively improved, and the whole recovery work can be smoothly carried out; and an expected effect is achieved.

Description

Technical Field

[0001] The present invention relates to the technical field of frequency converters, and particularly to a waste recycling and reuse device for frequency converter processing. Background Art

[0002] The recycling and reuse of frequency converter waste is of great significance. It can not only save resources, such as recycling metals, plastics, etc., but also protect the environment, avoid pollution, and reduce the costs of enterprises, creating economic value. It is necessary to strengthen technological research and development, improve regulatory policies, and raise public awareness to promote its development and achieve a win-win situation.

[0003] The patent application with the application number CN202122863915.3 discloses a waste recycling and reuse device for frequency converter processing, including a fixed housing. A base is arranged at the bottom of the fixed housing, an outer protective shell is arranged in the inner cavity of the base, a stepping motor is arranged in the inner cavity of the outer protective shell, the output end of the stepping motor is connected to a rotating shaft through a speed reducer, a support frame is arranged at the bottom of the inner cavity of the fixed housing, an inner housing is arranged at the top of the support frame, the rotating shaft extends into the inner cavity of the inner housing, the top of the inner housing is communicated with an inner cover housing, and a crushing grinding wheel is arranged in the inner cavity of the inner cover housing.

[0004] In summary, in the process of carrying out the recycling work of frequency converter processing waste, there are many challenges. Among them, the types of frequency converter waste are complex and diverse. For frequency converters of different models and specifications, their structures and material compositions are significantly different. During the crushing process of the frequency converter, the waste contains plastic and metal particle components, and the mixing of these components makes the screening work extremely difficult, thus making it difficult to improve the efficiency of waste recycling and reuse, affecting the smooth progress and effect achievement of the entire recycling work.

[0005] Therefore, we have proposed a waste recycling and reuse device for frequency converter processing. Summary of the Invention

[0006] In view of the deficiencies of the prior art, the present invention provides a waste recycling and reuse device for frequency converter processing to solve the problems raised in the above background art.

[0007] To achieve the above object, the present invention provides the following technical solution: A waste recycling and reuse device for frequency converter processing, including a screening mechanism. The screening mechanism includes a crushing box. The inner wall of the crushing box is provided with a sliding frame. The bottom of the crushing box is fixedly connected with a classification box. One end of the classification box away from the crushing box is slidably connected with a collection bin. The outer wall of the classification box near the collection bin is fixedly sleeved with a support frame. The bottom outer wall of the support frame is fixedly connected with a support foot. The left outer wall of the crushing box is rotatably connected with a box door through a hinge. The outer wall of the crushing box away from the box door is fixedly connected with a fixed block. The outer wall of the crushing box is fixedly connected with a first auxiliary motor. The output end of the first auxiliary motor is fixedly connected with a driving wheel. Further included are:

[0008] A crushing mechanism, including a rolling frame arranged inside the crushing box. The outer wall of the rolling frame is fixedly connected with a fixed ring. The outer surface of the fixed ring is provided with a groove. The inner wall of the groove is in rolling connection with the driving wheel. The outer wall of the crushing box is fixedly connected with a first driving motor. The output end of the first driving motor penetrates through the rolling frame and is fixedly connected with a connecting frame.

[0009] According to the above technical solution, the number of the fixed rings is two. The two fixed rings are symmetrically arranged with the central axis of the rolling frame as the center. The outer surface of the rolling frame is provided with a second through hole. The inner wall of the rolling frame is fixedly connected with a second crushing block. The second crushing block is used to increase the contact area between the frequency converter waste and the inner wall of the rolling frame, thereby facilitating the improvement of the crushing efficiency of the frequency converter waste.

[0010] According to the above technical solution, the outer wall of the connecting frame is fixedly connected with a second driving motor. The output end of the second driving motor penetrates through the connecting frame and is fixedly connected with an auxiliary roller. The outer surface of the auxiliary roller is fixedly connected with a first crushing block. The inner wall of the connecting frame is fixedly connected with a cleaning block. The second driving motor squeezes and crushes the frequency converter waste through the auxiliary roller, and the cleaning block fixedly connected to the inner wall of the connecting frame cleans the auxiliary roller to prevent the frequency converter waste from getting stuck between the first crushing blocks.

[0011] According to the above technical solution, the left outer wall of the classification box is fixedly connected with a second auxiliary motor. The output end of the second auxiliary motor is fixedly connected with a fan blade. The inner wall of the classification box near the second auxiliary motor is fixedly connected with a guide plate. The outer wall of the guide plate near the fan blade is fixedly connected with a first fixing frame. The guide plate is provided with an annular funnel shape, making the wind generated by the fan blade more concentrated, thereby facilitating the separation of plastic and metal particles in the waste.

[0012] According to the above technical solution, an air outlet is provided on the outer wall of one side of the classification box away from the second auxiliary motor. A first filter screen is fixedly connected to the inner wall of one end of the classification box close to the air outlet. An inclined plate is fixedly connected to the inner wall of the first fixing frame. The first filter screen has a certain elasticity. The air outlet is used to discharge the air generated by the fan blades. The plastic particles blown by the air are intercepted by the first filter screen.

[0013] According to the above technical solution, a fixed shaft is fixedly connected to the inner wall of one side of the crushing box close to the classification box. A fixed rod is fixedly connected to the inner wall of the crushing box. First bumps are fixedly connected to the outer wall of the fixed rod. The number of the fixed shafts and the fixed rods is four each. The four fixed shafts and the fixed rods are arranged adjacent to each other.

[0014] According to the above technical solution, a second fixing frame is fixedly connected to the outer wall of the sliding frame. A first through hole is fixedly connected to the inner wall of the second fixing frame. Second bumps are fixedly connected to the inner wall of the first through hole. The inner wall of the first through hole is slidably connected to the fixed rod. During the sliding process of the sliding frame, the second bumps come into contact with the first bumps, so that the sliding frame generates a certain vibration, thereby preventing waste particles from blocking the second filter screen.

[0015] According to the above technical solution, the inner wall of the second fixing frame is slidably connected to the fixed shaft. A second filter screen is fixedly connected to the inner wall of the sliding frame. A spring is fixedly connected to the outer wall of the bottom of the second fixing frame. One end of the spring away from the second fixing frame is fixedly connected to the fixed shaft. The spring is used for the reset of the second fixing frame.

[0016] Compared with the prior art, the present invention provides a waste recycling and reuse device for frequency converter processing, which has the following beneficial effects:

[0017] 1. By setting a waste recycling and reuse device for frequency converter processing, during the process of recycling waste from frequency converter processing, the frequency converter is crushed by means of a crushing mechanism. Subsequently, a screening mechanism is used to screen and separate the plastic and metal particle components contained in the waste, so as to effectively improve the efficiency of waste recycling and reuse, ensure the smooth progress of the entire recycling work, and achieve the expected effect.

[0018] 2. By setting a screening mechanism, when the waste passes through the second filter screen after being crushed, the fan blades are driven by the second auxiliary motor, so that the air generated by the fan blades is made more concentrated through the inclined plate, which is beneficial to separating the plastic and metal particles in the waste. The plastic particles with lighter mass are blown towards the first filter screen by the air. After the plastic particles are intercepted by the first filter screen, the plastic and metal particles are collected by the collection bin respectively.

[0019] 3. In the present invention, by providing a sliding frame, after the plastic and metal particles fall onto the second filter screen after being crushed, the sliding frame exerts a certain squeezing effect on the spring through the second fixing frame. During the sliding process of the sliding frame, when the second bump contacts the first bump, a specific vibration is generated on the sliding frame, which can effectively prevent waste particles from clogging the second filter screen and ensure the continuous and normal functioning of the filtering function of the filter screen.

[0020] 4. In the present invention, by providing a crushing mechanism, the first auxiliary motor enables the rolling frame to rotate by means of a driving wheel. At the same time, the first driving motor makes the connecting frame rotate in the opposite direction to the rolling frame, and the second driving motor makes the auxiliary roller rotate, so that the inverter inside the rolling frame can be crushed by means of the auxiliary roller. Through the rotational action of the rolling frame and the auxiliary roller, the particles that are not crushed up to the standard can be crushed twice, thereby improving the crushing efficiency of the inverter. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 is a schematic front view of the overall structure of the present invention;

[0022] Figure 2 is a schematic front view of the overall structure of the present invention;

[0023] Figure 3 is a schematic front sectional view of the overall structure of the present invention;

[0024] Figure 4 is a schematic view of the screening mechanism structure of the present invention;

[0025] Figure 5 is a schematic view of the screening mechanism structure of the present invention;

[0026] Figure 6 is a schematic view of the sliding frame and the second filter screen structure of the present invention;

[0027] Figure 7 is a schematic exploded view of the crushing mechanism of the present invention;

[0028] Figure 8 of the present invention Figure 3 is an enlarged schematic view of A in.

[0029] In the figure: 1. Screening mechanism; 101. Crushing box; 102. Classification box; 103. Collection bin; 104. Support frame; 105. Support feet; 106. Box door; 107. Fixed block; 108. First auxiliary motor; 109. Driving wheel; 110. Fixed shaft; 111. Fixed rod; 112. First bump; 113. Second auxiliary motor; 114. Guide plate; 115. Fan blade; 116. First fixing frame; 117. Inclined plate; 118. Air outlet; 119. First filter screen; 120. Sliding frame; 121. Second fixing frame; 122. First through hole; 123. Second bump; 124. Spring; 125. Second filter screen; 2. Crushing mechanism; 201. First driving motor; 202. Connecting frame; 203. Second driving motor; 204. Auxiliary roller; 205. First crushing block; 206. Cleaning block; 207. Rolling frame; 208. Second through hole; 209. Fixed ring; 210. Groove; 211. Second crushing block. Detailed implementation manners

[0030] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments.

[0031] Examples of the embodiments are shown in the accompanying drawings, where the same or similar reference numerals indicate the same or similar elements or elements with the same or similar functions throughout. The embodiments described below by referring to the accompanying drawings are exemplary and are intended to explain the present invention, and should not be construed as a limitation of the present invention.

[0032] In the present invention, unless otherwise clearly defined and limited, terms such as "installed", "connected", "connected", "fixed", etc. should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or integrated; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two elements or the interaction relationship between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0033] Example 1: Refer to Figures 1 - 4, the present invention provides a technical solution: a waste recycling and reuse device for frequency converter processing, including a screening mechanism 1. The screening mechanism 1 includes a crushing box 101. The inner wall of the crushing box 101 is provided with a sliding frame 120. The bottom of the crushing box 101 is fixedly connected to a classification box 102. One end of the classification box 102 away from the crushing box 101 is slidably connected to a collection bin 103. The outer wall of the classification box 102 near the collection bin 103 is fixedly sleeved with a support frame 104. The bottom outer wall of the support frame 104 is fixedly connected to a support leg 105. The left outer wall of the crushing box 101 is rotatably connected to a box door 106 by a hinge. The outer wall of the crushing box 101 away from the box door 106 is fixedly connected to a fixed block 107. The outer wall of the crushing box 101 is fixedly connected to a first auxiliary motor 108. The output end of the first auxiliary motor 108 is fixedly connected to a driving wheel 109. It also includes:

[0034] A crushing mechanism 2, including a rolling frame 207 arranged inside the crushing box 101. The outer wall of the rolling frame 207 is fixedly connected to a fixed ring 209. The outer surface of the fixed ring 209 is provided with a groove 210. The inner wall of the groove 210 is in rolling connection with the driving wheel 109. The outer wall of the crushing box 101 is fixedly connected to a first driving motor 201. The output end of the first driving motor 201 penetrates through the rolling frame 207 and is fixedly connected to a connecting frame 202. During the recycling operation of frequency converter processing waste, the crushing mechanism 2 is relied on to crush the frequency converter. Immediately afterwards, the screening mechanism 1 is used to screen and separate the plastic and metal particle components contained in the waste. This can effectively improve the efficiency of waste recycling and reuse, ensure the smooth progress of the entire recycling work, and achieve the expected effect.

[0035] The left outer wall of the classification box 102 is fixedly connected to a second auxiliary motor 113. The output end of the second auxiliary motor 113 is fixedly connected to a fan blade 115. The inner wall of the classification box 102 near the second auxiliary motor 113 is fixedly connected to a guide plate 114. The outer wall of the guide plate 114 near the fan blade 115 is fixedly connected to a first fixing frame 116. The guide plate 114 is designed in a ring-shaped funnel shape, so that the wind generated by the fan blade 115 can be more concentrated, which is conducive to separating the plastic and metal particles in the waste, and improving the efficiency and effect of waste classification.

[0036] On the outer wall of one side of the sorting box 102 away from the second auxiliary motor 113, an air outlet 118 is provided. On the inner wall of one end of the sorting box 102 close to the air outlet 118, a first filter screen 119 is fixedly connected. An inclined plate 117 is fixedly connected to the inner wall of the first fixing frame 116. The first filter screen 119 has certain elastic characteristics. The function of the air outlet 118 is to discharge the air generated by the fan blade 115. During the process of air discharge, the first filter screen 119 can effectively intercept the plastic particles blown by the wind, preventing the plastic particles from being discharged to the external environment along with the wind, thereby realizing the preliminary separation of plastic particles from other substances.

[0037] The working principle of this embodiment is as follows: When waste recycling of the frequency converter is required, the frequency converter to be crushed is placed into the crushing box 101 through the box door 106. Then, the crushing mechanism 2 is relied on to perform the crushing operation on the frequency converter. When the waste is crushed and passes through the second filter screen 125, the second auxiliary motor 113 is used to drive the fan blade 115 to rotate. Due to the action of the inclined plate 117, the wind generated by the fan blade 115 is more concentrated, which is beneficial to separating the plastic and metal particles in the waste. The plastic particles with lighter quality will be blown by the wind towards the first filter screen 119. After the first filter screen 119 intercepts the plastic particles, the collection bin 103 collects the plastic and metal particles respectively, thereby realizing the classified recycling of different materials in the waste, improving the purity and efficiency of resource recycling, and providing convenient conditions for subsequent reuse work.

[0038] Embodiment 2: Please refer to Figures 5 - 6 , on the basis of Embodiment 1, the present invention provides a technical solution: A fixed shaft 110 is fixedly connected to the inner wall of one side of the crushing box 101 close to the sorting box 102. A fixed rod 111 is fixedly connected to the inner wall of the crushing box 101. A first bump 112 is fixedly connected to the outer wall of the fixed rod 111. The number of the fixed shafts 110 and the fixed rods 111 is four each, and the four fixed shafts 110 and the fixed rods 111 are arranged adjacent to each other.

[0039] A second fixing frame 121 is fixedly connected to the outer wall of the sliding frame 120. A first through hole 122 is fixedly connected to the inner wall of the second fixing frame 121. A second bump 123 is fixedly connected to the inner wall of the first through hole 122. During the process of the sliding frame 120 sliding, when the second bump 123 comes into contact with the first bump 112, a specific vibration is generated on the sliding frame 120, which can effectively prevent the waste particles from blocking the second filter screen 125 and ensure that the filtering function of the filter screen continues to be normally exerted. The inner wall of the first through hole 122 is slidably connected to the fixed rod 111.

[0040] The inner wall of the second fixing frame 121 is slidably connected to the fixing shaft 110. A second filter screen 125 is fixedly connected to the inner wall of the sliding frame 120. A spring 124 is fixedly connected to the outer wall of the bottom of the second fixing frame 121. The spring 124 is used for the reset of the second fixing frame 121. One end of the spring 124 away from the second fixing frame 121 is fixedly connected to the fixing shaft 110.

[0041] The working principle of this embodiment is as follows: After the plastic and metal particles are crushed and fall on the second filter screen 125, during the sliding process of the sliding frame 120, a certain extrusion force will be applied to the spring 124 via the second fixing frame 121. And during the sliding process of the sliding frame 120, when the second bump 123 touches the first bump 112, it will cause the sliding frame 120 to generate specific vibrations, thereby effectively preventing the waste particles from clogging the second filter screen 125 and ensuring that the filtering function of the filter screen can continue to play a normal role.

[0042] Embodiment Three: Please refer to Figures 7 - 8 Based on Embodiment One and Embodiment Two, the present invention provides a technical solution: The number of fixing rings 209 is two. The two fixing rings 209 are symmetrically arranged with the central axis of the rolling frame 207 as the center. A second through hole 208 is formed on the outer surface of the rolling frame 207. A second crushing block 211 is fixedly connected to the inner wall of the rolling frame 207. The second crushing block 211 can increase the contact area between the waste of the frequency converter and the inner wall of the rolling frame 207, thereby being beneficial to improving the crushing efficiency of the waste of the frequency converter.

[0043] A second driving motor 203 is fixedly connected to the outer wall of the connecting frame 202. The output end of the second driving motor 203 penetrates through the connecting frame 202 and is fixedly connected with an auxiliary roller 204. A first crushing block 205 is fixedly connected to the outer surface of the auxiliary roller 204. A cleaning block 206 is fixedly connected to the inner wall of the connecting frame 202. The second driving motor 203 uses the auxiliary roller 204 to perform an extrusion and crushing operation on the waste of the frequency converter. At the same time, the cleaning block 206 fixedly connected to the inner wall of the connecting frame 202 is used to clean the auxiliary roller 204 to prevent the waste of the frequency converter from getting stuck between the first crushing blocks 205, ensuring the smooth progress of the crushing work and the normal operation of the equipment, and reducing problems such as equipment failures and efficiency reduction that may be caused by the waste getting stuck.

[0044] The working principle of this embodiment is as follows: The first auxiliary motor 108 drives the rolling frame 207 to rotate by relying on the driving wheel 109. At the same time, the connecting frame 202 rotates in the opposite direction to the rolling frame 207 through the first driving motor 201, and the auxiliary roller 204 can rotate through the second driving motor 203. The auxiliary roller 204 can be used to crush the frequency converter inside the rolling frame 207. By virtue of the rotational action of the rolling frame 207 and the auxiliary roller 204, the particles that are not crushed up to the standard can be crushed a second time, thereby improving the crushing efficiency of the frequency converter. The second driving motor 203 performs extrusion crushing operation on the frequency converter waste through the auxiliary roller 204. At the same time, the cleaning block 206 fixedly connected to the inner wall of the connecting frame 202 is used to clean the auxiliary roller 204, preventing the frequency converter waste from getting stuck between the first crushing blocks 205, ensuring the smooth progress of the crushing work and the normal operation of the equipment, reducing problems such as equipment failures and efficiency reduction that may be caused by the waste getting stuck, and ensuring that the entire crushing process proceeds efficiently and stably.

[0045] It should be noted that in this article, relational terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the term "comprising", "including" or any other variant thereof is intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements not only includes those elements, but also includes other elements not expressly listed, or also includes elements inherent to such process, method, article or device.

[0046] Finally, it should be noted that the above are only the preferred embodiments of the present invention and are not used to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements on some of the technical features. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. A waste recycling and reuse device for frequency converter processing, comprising a screening mechanism (1), the screening mechanism (1) includes a crushing box (101), the inner wall of the crushing box (101) is provided with a sliding frame (120), the bottom of the crushing box (101) is fixedly connected with a classification box (102), one end of the classification box (102) far from the crushing box (101) is slidably connected with a collection bin (103), the outer wall of one end of the classification box (102) close to the collection bin (103) is fixedly sleeved with a support frame (104), the bottom outer wall of the support frame (104) is fixedly connected with a support foot (105), the left outer wall of the crushing box (101) is rotatably connected with a box door (106) through a hinge, the outer wall of the crushing box (101) far from the box door (106) is fixedly connected with a fixed block (107), the outer wall of the crushing box (101) is fixedly connected with a first auxiliary motor (108), and the output end of the first auxiliary motor (108) is fixedly connected with a driving wheel (109), characterized in that, It further includes: A crushing mechanism (2), including a rolling frame (207) arranged inside a crushing box (101). An outer wall of the rolling frame (207) is fixedly connected with a fixing ring (209). A groove (210) is formed on an outer surface of the fixing ring (209). An inner wall of the groove (210) is in rolling connection with a driving wheel (109). An outer wall of the crushing box (101) is fixedly connected with a first driving motor (201). An output end of the first driving motor (201) penetrates through the rolling frame (207) and is fixedly connected with a connecting frame (202).

2. The waste recycling and reuse device for frequency converter processing according to claim 1, wherein: The number of the fixing rings (209) is two. The two fixing rings (209) are symmetrically arranged with the central axis of the rolling frame (207) as the center. A second through hole (208) is formed on an outer surface of the rolling frame (207). An inner wall of the rolling frame (207) is fixedly connected with a second crushing block (211).

3. The waste recycling and reuse device for frequency converter processing according to claim 2, characterized in that: An outer wall of the connecting frame (202) is fixedly connected with a second driving motor (203). An output end of the second driving motor (203) penetrates through the connecting frame (202) and is fixedly connected with an auxiliary roller (204). A first crushing block (205) is fixedly connected to an outer surface of the auxiliary roller (204). An inner wall of the connecting frame (202) is fixedly connected with a cleaning block (206).

4. A waste recycling and reuse device for frequency converter processing according to claim 1, characterized in that: A second auxiliary motor (113) is fixedly connected to a left outer wall of the sorting box (102). An output end of the second auxiliary motor (113) is fixedly connected with a fan blade (115). A guiding plate (114) is fixedly connected to an inner wall of the sorting box (102) close to the second auxiliary motor (113). A first fixing frame (116) is fixedly connected to an outer wall of the guiding plate (114) close to the fan blade (115).

5. The waste recycling and reuse device for frequency converter processing according to claim 4, wherein: An air outlet (118) is formed on an outer wall of the sorting box (102) away from the second auxiliary motor (113). A first filter screen (119) is fixedly connected to an inner wall of the sorting box (102) close to the air outlet (118). An inclined plate (117) is fixedly connected to an inner wall of the first fixing frame (116).

6. The waste recycling and reuse device for frequency converter processing according to claim 1, characterized in that: A fixing shaft (110) is fixedly connected to an inner wall of the crushing box (101) close to the sorting box (102). A fixing rod (111) is fixedly connected to an inner wall of the crushing box (101). A first bump (112) is fixedly connected to an outer wall of the fixing rod (111).

7. A waste recycling and reuse device for frequency converter processing according to claim 6, characterized in that: A second fixing frame (121) is fixedly connected to an outer wall of the sliding frame (120). A first through hole (122) is fixedly connected to an inner wall of the second fixing frame (121). A second bump (123) is fixedly connected to an inner wall of the first through hole (122). The inner wall of the first through hole (122) is in sliding connection with the fixing rod (111).

8. A waste recycling and reuse device for frequency converter processing according to claim 7, characterized in that: The inner wall of the second fixing bracket (121) is slidably connected to the fixing shaft (110). The inner wall of the sliding bracket (120) is fixedly connected with a second filter screen (125). The outer wall of the bottom of the second fixing bracket (121) is fixedly connected with a spring (124). One end of the spring (124) away from the second fixing bracket (121) is fixedly connected to the fixing shaft (110).

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