Three-dimensional layered pruning machine for fruit trees

Abstract

The application discloses a fruit tree three-dimensional layered pruning machine, which comprises a mechanical arm tilting assembly, a mechanical arm lifting assembly, a pruning mechanical arm assembly and a plurality of cutter disc assemblies, the mechanical arm lifting assembly is fixed on the mechanical arm tilting assembly, the pruning mechanical arm assembly is fixed on the mechanical arm lifting assembly, and the plurality of cutter disc assemblies are all installed on the pruning mechanical arm assembly and are spacedly distributed from top to bottom. The height, the tilting angle and the cutter disc assembly spacing of the application can be adjusted, continuous, fast three-dimensional layered pruning of fruit trees is realized, and the applicability is improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of fruit tree pruning device, more particularly to a fruit tree three-dimensional layered pruning machine. BACKGROUND

[0002] The fruit tree pruning method can be divided into manual pruning and mechanical pruning. Manual pruning mainly uses some auxiliary pruning tools (electric scissors, pneumatic scissors or hydraulic scissors), and workers perform single branch selection pruning operation by hand or on the back. It is suitable for small orchards with scattered planting, and can control tree shape and fine management manually, but the labor intensity is large and the efficiency is low. Mechanical pruning mainly uses vehicle-mounted pruning machines for operation, which is suitable for large orchards with large-scale planting, and saves labor and improves efficiency.

[0003] At present, pruning device models are mainly divided into reciprocating cutting type pruning machines, sawtooth disc type pruning machines and rotary knife type pruning machines according to different pruning tools. The reciprocating cutting type pruning machine mainly consists of a frame, a reciprocating cutter and a hydraulic system. The reciprocating cutter is generally composed of a set of reciprocating moving blades and fixed blades. The sawtooth disc type pruning machine mainly consists of a frame, a sawtooth disc type cutter and a hydraulic system. The sawtooth disc knife is generally arranged vertically on one side. The rotary knife type pruning machine mainly consists of a frame, a rotary knife and a hydraulic system. The hydraulic system of the tractor or the self-provided hydraulic system is used to realize the rotary cutting operation of the rotary knife.

[0004] However, the existing reciprocating cutting type pruning machine, rotary knife type pruning machine and disc type pruning machine are mainly applied to fruit tree shaping pruning, and it is difficult to meet the requirements of continuous, rapid three-dimensional layered pruning of fruit trees, and the applicability is poor.

[0005] Therefore, it is an urgent problem for those skilled in the art to provide a fruit tree three-dimensional layered pruning machine.

[0006] INVENTION

[0007] Therefore, the present application provides a fruit tree three-dimensional layered pruning machine, which realizes continuous, rapid three-dimensional layered pruning of fruit trees and improves the applicability.

[0008] In order to achieve the above purpose, the present application adopts the following technical solutions:

[0009] A fruit tree three-dimensional layered pruning machine, comprising a mechanical arm tilting assembly, a mechanical arm lifting assembly, a pruning mechanical arm assembly and a plurality of cutter disc assemblies, the mechanical arm lifting assembly is fixed on the mechanical arm tilting assembly; the pruning mechanical arm assembly is fixed on the mechanical arm lifting assembly; a plurality of cutter disc assemblies are installed on the pruning mechanical arm assembly and are spaced from top to bottom.

[0010] By adopting the above technical solutions, the present application has the following advantages:

[0011] The height of pruning, the angle of inclination and the spacing between the cutter head assembly are adjustable, so that the fruit trees can be continuously and quickly pruned in three dimensions in layers, and the applicability is improved.

[0012] Further, the mechanical arm inclination assembly comprises a fixed support frame, a first connecting frame and an inclination hydraulic cylinder, the first connecting frame is rotationally connected with the fixed support frame through a first rotating shaft; the mechanical arm lifting assembly is fixedly connected with the first connecting frame; one end of the inclination hydraulic cylinder is hinged to the fixed support frame, and the other end of the inclination hydraulic cylinder is hinged to the first connecting frame.

[0013] The inclination hydraulic cylinder can drive the first connecting frame to rotate on the fixed support frame, so that the inclination angle of the mechanical arm lifting assembly and the pruning mechanical arm assembly as a whole can be adjusted.

[0014] Further, the mechanical arm lifting assembly comprises a lifting pipe, a lifting hydraulic cylinder and a second connecting frame, the inner pipe of the lifting pipe is fixedly connected with the first connecting frame; the cylinder body of the lifting hydraulic cylinder is fixedly connected with the inner pipe, and the telescopic rod of the lifting hydraulic cylinder is fixedly connected with the outer pipe of the lifting pipe; the outer pipe is fixedly connected with the pruning mechanical arm assembly through the second connecting frame.

[0015] The lifting hydraulic cylinder can drive the lifting pipe to lift, and under the connection action of the second connecting frame, the pruning mechanical arm assembly is driven to lift and adjust.

[0016] Further, the pruning mechanical arm assembly comprises a third connecting frame, a first telescopic column, a second telescopic column, a first hydraulic cylinder, a second hydraulic cylinder and a plurality of support arms, the outer pipe is fixedly connected with the third connecting frame through the second connecting frame; the first telescopic column and the second telescopic column are distributed above and below and are respectively slidably connected with the third connecting frame; the cylinder body of the first hydraulic cylinder is hinged to the third connecting frame, and the extending end of the telescopic rod of the first hydraulic cylinder is hinged to the first telescopic column; the cylinder body of the second hydraulic cylinder is hinged to the third connecting frame, and the extending end of the telescopic rod of the second hydraulic cylinder is hinged to the second telescopic column; a plurality of the support arms are respectively installed on the first telescopic column, the third connecting frame and the second telescopic column and are spaced apart; a plurality of the cutter head assemblies are respectively installed on the plurality of the support arms.

[0017] The first hydraulic cylinder can drive the first telescopic column to lift and move in the third connecting frame, and the second hydraulic cylinder can drive the second telescopic column to lift and move in the third connecting frame, so that the spacing adjustment of the cutter head assembly can be realized.

[0018] Further, the plurality of support arms are respectively rotatably connected with the first telescopic column, the third connecting frame and the second telescopic column through second rotating shafts, and air springs are arranged between the first telescopic column and the support arms, between the third connecting frame and the support arms and between the second telescopic column and the support arms.

[0019] The above further technical solution has the beneficial effect of realizing obstacle avoidance of the support arm.

[0020] Further, each cutter disc assembly comprises a gear motor, a transmission shaft, a fixing assembly, a belt transmission mechanism, an upper disc cutter, a lower disc cutter and a support disc set, the gear motor is arranged on the support arm, the fixing assembly is arranged on the transmission shaft through a first bearing set, and the fixing assembly is fixedly connected with the support arm; the gear motor is in transmission connection with the transmission shaft through the belt transmission mechanism; the upper disc cutter is fixedly arranged at the top end of the transmission shaft through a first support sleeve, the lower disc cutter is fixedly arranged at the bottom end of the transmission shaft through a second support sleeve, and the support disc set is arranged on the transmission shaft through a second bearing set and located on the side close to the lower disc cutter.

[0021] The above further technical solution has the beneficial effect that the upper disc cutter and the lower disc cutter distributed in an upper-lower interval can thin out branches inside the crown of a fruit tree, the upper disc cutter is a non-supported cutting, the lower disc cutter forms a supported cutting under the action of the support disc set, is suitable for fruit trees with different diameters and rigidities, increases the applicable range, and increases the stability during cutting, improves the cutting quality and efficiency.

[0022] Further, the fixing assembly comprises a fixing disc and a welded wheel, the first bearing set comprises a first sealed deep groove ball bearing and a first deep groove ball bearing distributed inside and outside, the fixing disc is arranged on the transmission shaft through the first sealed deep groove ball bearing, and the fixing disc is fixedly connected with the support arm; the welded wheel is arranged on the fixing disc through the first deep groove ball bearing.

[0023] Further, the support disc set comprises an upper support disc and a lower support disc distributed in an upper-lower direction, the second bearing set comprises a second sealed deep groove ball bearing and a second deep groove ball bearing distributed inside and outside, the lower support disc is arranged on the transmission shaft through the second sealed deep groove ball bearing, and the upper support disc is arranged on the lower support disc through the second deep groove ball bearing.

[0024] Further, the upper support disc comprises an upper support disc body and a plurality of first clamping teeth connected as a whole, the upper support disc body has a plurality of evenly distributed pitch adjustment holes on the side surface; the plurality of first clamping teeth are evenly distributed along the circumferential direction of the upper support disc body; the lower support disc comprises a lower support disc body and a plurality of second clamping teeth connected as a whole, the lower support disc body is installed on the transmission shaft through the second sealing deep groove ball bearing, the upper support disc body is installed on the lower support disc body through the second deep groove ball bearing; the lower support disc body has a plurality of fixing holes on the side surface, and the plurality of fixing holes are respectively corresponding to the plurality of pitch adjustment holes in position; each corresponding fixing hole and pitch adjustment hole is connected through a bolt; the plurality of second clamping teeth are evenly distributed along the circumferential direction of the lower support disc body, and the plurality of second clamping teeth are respectively corresponding to the plurality of first clamping teeth in position.

[0025] The beneficial effects produced by the above further technical scheme are that the interlacing degree between the first clamping teeth and the second clamping teeth is changed by rotating the upper support disc, different sizes of clamping holes are formed between the first clamping teeth and the second clamping teeth, and the clamping of branches with different diameters is realized.

[0026] Further, the cutter disc assembly further comprises a gasket, the gasket is sleeved and installed on the transmission shaft, and located between the lower support disc body and the second support sleeve. BRIEF DESCRIPTION OF DRAWINGS

[0027] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings needed to be used in the embodiments or the prior art description. Obviously, the drawings in the following description are only embodiments of the present application, and other drawings can also be obtained by those skilled in the art without creative labor on the basis of the provided drawings.

[0028] Figure 1 The accompanying drawings provide a schematic view of the overall structure of a fruit tree three-dimensional layered pruning machine;

[0029] Figure 2 The accompanying drawings provide a schematic view of the structure of a mechanical arm tilting assembly and a mechanical arm lifting assembly;

[0030] Figure 3 The accompanying drawings provide a schematic view of the structure of a pruning mechanical arm assembly and a cutter disc assembly;

[0031] Figure 4 The accompanying drawings provide a schematic view of the structure of a cutter disc assembly;

[0032] Figure 5 The accompanying drawings provide a schematic view of the structure of a support disc set. DETAILED DESCRIPTION

[0033] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0034] like Figures 1-5 As shown in the figure, this invention discloses a three-dimensional layered pruning machine for fruit trees, including a mechanical arm tilting assembly 1, a mechanical arm lifting assembly 2, a pruning mechanical arm assembly 3, and multiple cutter disc assemblies 4. In this embodiment, the number of cutter disc assemblies 4 is set to 3; the mechanical arm lifting assembly 2 is fixed on the mechanical arm tilting assembly 1; the pruning mechanical arm assembly 3 is fixed on the mechanical arm lifting assembly 2; the multiple cutter disc assemblies 4 are all installed on the pruning mechanical arm assembly 3 and are distributed at intervals from top to bottom. The pruning height, tilt angle, and cutter disc assembly intervals of this invention are adjustable, realizing continuous and rapid three-dimensional layered pruning of fruit trees, thus improving applicability.

[0035] Specifically, the robotic arm tilting assembly 1 includes a fixed support frame 11, a first connecting frame 12, and a tilting hydraulic cylinder 13. The first connecting frame 12 is rotatably connected to the fixed support frame 11 via a first rotating shaft 14. The robotic arm lifting assembly 2 is fixedly connected to the first connecting frame 12. One end of the tilting hydraulic cylinder 13 is hinged to the fixed support frame 11, and the other end of the tilting hydraulic cylinder 13 is hinged to the first connecting frame 12. The tilting hydraulic cylinder 13 can drive the first connecting frame 12 to rotate on the fixed support frame 11, thereby realizing the overall tilt angle adjustment of the robotic arm lifting assembly 2 and the trimming robotic arm assembly 3.

[0036] Specifically, the robotic arm lifting assembly 2 includes a lifting tube 21, a lifting hydraulic cylinder 22, and a second connecting frame 23. The inner tube of the lifting tube 21 is fixedly connected to the first connecting frame 12; the cylinder body of the lifting hydraulic cylinder 22 is fixedly connected to the inner tube, and the telescopic rod of the lifting hydraulic cylinder 22 is fixedly connected to the outer tube of the lifting tube 21; the outer tube is fixedly connected to the trimming robotic arm assembly 3 through the second connecting frame 23. The lifting hydraulic cylinder 22 can drive the lifting tube 21 to rise and fall, and under the connection of the second connecting frame 23, it drives the trimming robotic arm assembly 3 to rise and fall and adjust. In this embodiment, the number of lifting tubes 21 is set to two, and the two lifting tubes 21 are distributed at intervals. The lifting hydraulic cylinder 22 is located between the two lifting tubes 21, thereby increasing the structural stability.

[0037] Specifically, the pruning mechanical arm assembly 3 comprises a third connecting frame 31, a first telescopic column 32, a second telescopic column 33, a first hydraulic cylinder 34, a second hydraulic cylinder 35 and a plurality of supporting arms 36, the outer tube is fixedly connected with the third connecting frame 31 through the second connecting frame 23; the first telescopic column 32 and the second telescopic column 33 are distributed above and below and are respectively slidably connected with the third connecting frame 31, in this embodiment, the third connecting frame 31 has sliding holes corresponding to the first telescopic column 32 and the second telescopic column 33 respectively; the cylinder body of the first hydraulic cylinder 34 is hingedly connected with the third connecting frame 31, and the extension end of the telescopic rod of the first hydraulic cylinder 34 is hingedly connected with the first telescopic column 32; the cylinder body of the second hydraulic cylinder 35 is hingedly connected with the third connecting frame 31, and the extension end of the telescopic rod of the second hydraulic cylinder 35 is hingedly connected with the second telescopic column 33; the plurality of supporting arms 36 are respectively installed on the first telescopic column 32, the third connecting frame 31 and the second telescopic column 33 and are distributed at intervals; the plurality of cutter assemblies 4 are respectively installed on the plurality of supporting arms 36; the first hydraulic cylinder 34 can drive the first telescopic column 32 to move up and down in the third connecting frame 31, and the second hydraulic cylinder 35 can drive the second telescopic column 33 to move up and down in the third connecting frame 31, so as to realize the interval adjustment of the cutter assembly 4.

[0038] In order to further optimize the technical scheme of the application, the plurality of supporting arms 36 are respectively rotatably connected with the first telescopic column 32, the third connecting frame 31 and the second telescopic column 33 through the second rotating shafts 37, and the air springs 38 are installed between the first telescopic column 32 and the supporting arms 36, between the third connecting frame 31 and the supporting arms 36 and between the second telescopic column 33 and the supporting arms 36, so as to realize the obstacle avoidance of the supporting arms 36.

[0039] Specifically, each cutter head assembly 4 comprises a gear motor 41, a transmission shaft 42, a fixed assembly 43, a belt transmission mechanism 44, an upper disc cutter 45, a lower disc cutter 46 and a support disc set 47, the gear motor 41 is installed on the support arm 36, the fixed assembly 43 is installed on the transmission shaft 42 through a first bearing set, and the fixed assembly 43 is fixedly connected with the support arm 36; the gear motor 41 is in transmission connection with the transmission shaft 42 through the belt transmission mechanism 44, in the embodiment, the belt transmission mechanism 44 comprises a multi-wedge belt wheel and a belt, the multi-wedge belt wheel is installed in the middle part of the transmission shaft 42; the output shaft of the gear motor 41 is in transmission connection with the multi-wedge belt wheel through the belt; the upper disc cutter 45 is fixedly installed at the top end part of the transmission shaft 42 through a first support sleeve 48, the lower disc cutter 46 is fixedly installed at the bottom end part of the transmission shaft 42 through a second support sleeve 49, in the embodiment, the upper disc cutter 45 and the lower disc cutter 46 are the same in structure, and each comprises a disc cutter main body and a plurality of sawteeth which are connected as a whole and are evenly distributed along the circumference of the disc cutter main body; the support disc set 47 is installed on the transmission shaft 42 through a second bearing set and is located on the side close to the lower disc cutter 46, the upper disc cutter 45 and the lower disc cutter 46 which are distributed at intervals can be used for thinning and pruning the inside of the tree crown of the fruit tree, the upper disc cutter 45 is used for non-supported cutting, the lower disc cutter 46 forms supported cutting under the action of the support disc set 47, is suitable for fruit trees with different diameters and rigidities, increases the application range, increases the stability during cutting, and improves the cutting quality and efficiency.

[0040] Specifically, the fixed assembly 43 comprises a fixed disc 431 and a welded wheel 432, the first bearing set comprises a first sealed deep groove ball bearing and a first deep groove ball bearing which are distributed inside and outside, the fixed disc 431 is installed on the transmission shaft 42 through the first sealed deep groove ball bearing, and the fixed disc 431 is fixedly connected with the support arm 36; the welded wheel 432 is installed on the fixed disc 431 through the first deep groove ball bearing.

[0041] Specifically, the support disc set 47 comprises an upper support disc 471 and a lower support disc 472 which are distributed in an up-down manner, the second bearing set comprises a second sealed deep groove ball bearing and a second deep groove ball bearing which are distributed inside and outside, the lower support disc 472 is installed on the transmission shaft 42 through the second sealed deep groove ball bearing, and the upper support disc 471 is installed on the lower support disc 472 through the second deep groove ball bearing.

[0042] Specifically, the upper support disc 471 comprises an upper support disc body and a plurality of first clamping teeth connected as a whole, the upper support disc body has a plurality of evenly distributed pitch adjustment holes 4711 on the side surface; the plurality of first clamping teeth are evenly distributed along the circumference of the upper support disc body; the lower support disc 472 comprises a lower support disc body and a plurality of second clamping teeth connected as a whole, the lower support disc body is installed on the transmission shaft 42 through a second sealing deep groove ball bearing, the upper support disc body is installed on the lower support disc body through a second deep groove ball bearing; the lower support disc body has a plurality of fixing holes on the side surface, and the plurality of fixing holes respectively correspond to the plurality of pitch adjustment holes 4711 in position; each corresponding fixing hole and pitch adjustment hole 4711 are connected through a bolt; the plurality of second clamping teeth are evenly distributed along the circumference of the lower support disc body, and the plurality of second clamping teeth respectively correspond to the plurality of first clamping teeth in position, so that the interlaced degree between the first clamping teeth and the second clamping teeth is changed by rotating the upper support disc, the clamping holes of different sizes are formed between the first clamping teeth and the second clamping teeth, and the clamping of branches of different diameters is realized.

[0043] In order to further optimize the technical scheme of the present application, the cutter disc assembly 4 further comprises a gasket 410, which is sleeved and installed on the transmission shaft 42 and located between the lower support disc body and the second support sleeve 49.

[0044] The embodiments in the specification are described in a progressive manner, and each embodiment focuses on the difference from other embodiments. The same and similar parts between the embodiments can be referred to each other. For the device disclosed in the embodiments, since it corresponds to the method disclosed in the embodiments, the description is relatively simple, and the related parts can be referred to the method part.

[0045] The above description of the disclosed embodiments enables a person skilled in the art to implement or use the present application. Various modifications to the embodiments will be apparent to those skilled in the art, and the general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the present application. Therefore, the present application will not be limited to the embodiments shown herein, but will conform to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A fruit tree three-dimensional pruning machine, characterized in that, The device includes a robotic arm tilting assembly, a robotic arm lifting assembly, a trimming robotic arm assembly, and multiple cutter head assemblies. The robotic arm lifting assembly is fixed to the robotic arm tilting assembly. The trimming robotic arm assembly is fixed to the robotic arm lifting assembly. The multiple cutter head assemblies are all mounted on the trimming robotic arm assembly and are distributed at intervals from top to bottom. Each of the cutter head assemblies includes a gear motor, a drive shaft, a fixing assembly, a belt drive mechanism, an upper disc cutter, a lower disc cutter, and a support plate assembly. The trimming robot arm assembly includes a support arm. The gear motor is mounted on the support arm. The fixing assembly is mounted on the drive shaft via a first bearing assembly, and the fixing assembly is fixedly connected to the support arm. The gear motor is driven by the belt drive mechanism. The upper disc cutter is fixedly mounted on the top end of the drive shaft via a first support sleeve. The lower disc cutter is fixedly mounted on the bottom end of the drive shaft via a second support sleeve. The support plate assembly is mounted on the drive shaft via a second bearing assembly and is located on the side closer to the lower disc cutter. The fixing assembly includes a fixing disc and a welding wheel. The first bearing assembly includes a first sealed deep groove ball bearing and a first deep groove ball bearing distributed internally and externally. The fixing disc is mounted on the drive shaft via the first sealed deep groove ball bearing, and the fixing disc is fixedly connected to the support arm. The welding wheel is mounted on the fixing disc via the first deep groove ball bearing. The support plate assembly includes an upper support plate and a lower support plate distributed vertically. The second bearing assembly includes a second sealed deep groove ball bearing and a second deep groove ball bearing distributed internally and externally. The lower support plate is mounted on the drive shaft via the second sealed deep groove ball bearing, and the upper support plate is mounted on the lower support plate via the second deep groove ball bearing. The upper support plate includes an integral upper support plate body and a plurality of first locking teeth. The upper support plate body has a plurality of evenly distributed adjustment holes on its side. The plurality of first locking teeth are evenly distributed around the circumference of the upper support plate body. The lower support plate includes an integral lower support plate body and a plurality of second locking teeth. The lower support plate body is mounted on the drive shaft via a second sealed deep groove ball bearing, and the upper support plate body is mounted on the lower support plate body via a second deep groove ball bearing. The lower support plate body has a plurality of fixing holes on its side, and the plurality of fixing holes correspond to the positions of the plurality of adjustment holes. Each corresponding fixing hole and adjustment hole is connected by bolts. The plurality of second locking teeth are evenly distributed around the circumference of the lower support plate body, and the plurality of second locking teeth correspond to the positions of the plurality of first locking teeth.

2. A fruit tree pruning machine according to claim 1, characterized in that, The robotic arm tilting assembly includes a fixed support frame, a first connecting frame, and a tilting hydraulic cylinder. The first connecting frame is rotatably connected to the fixed support frame via a first rotating shaft. The robotic arm lifting assembly is fixedly connected to the first connecting frame. One end of the tilting hydraulic cylinder is hinged to the fixed support frame, and the other end of the tilting hydraulic cylinder is hinged to the first connecting frame.

3. A fruit tree pruning machine according to claim 2, characterized in that, The robotic arm lifting assembly includes a lifting tube, a lifting hydraulic cylinder, and a second connecting frame. The inner tube of the lifting tube is fixedly connected to the first connecting frame; the cylinder body of the lifting hydraulic cylinder is fixedly connected to the inner tube, and the telescopic rod of the lifting hydraulic cylinder is fixedly connected to the outer tube of the lifting tube; the outer tube is fixedly connected to the trimming robotic arm assembly through the second connecting frame.

4. A fruit tree pruning machine according to claim 3, characterized in that, The pruning robotic arm assembly includes a third connecting frame, a first telescopic column, a second telescopic column, a first hydraulic cylinder, a second hydraulic cylinder, and multiple support arms. The outer tube is fixedly connected to the third connecting frame via the second connecting frame. The first and second telescopic columns are vertically distributed and slidably connected to the third connecting frame. The cylinder body of the first hydraulic cylinder is hinged to the third connecting frame, and the extension end of the telescopic rod of the first hydraulic cylinder is hinged to the first telescopic column. The cylinder body of the second hydraulic cylinder is hinged to the third connecting frame, and the extension end of the telescopic rod of the second hydraulic cylinder is hinged to the second telescopic column. Multiple support arms are respectively mounted on the first telescopic column, the third connecting frame, and the second telescopic column and are spaced apart. Multiple cutter head assemblies are respectively mounted on multiple support arms.

5. A fruit tree pruning machine according to claim 4, characterized in that, The multiple support arms are rotatably connected to the first telescopic column, the third connecting frame, and the second telescopic column via a second rotating shaft, and gas springs are installed between the first telescopic column and the support arm, between the third connecting frame and the support arm, and between the second telescopic column and the support arm.

6. A fruit tree pruning machine according to claim 1, characterized in that, The cutter head assembly also includes a gasket, which is fitted onto the drive shaft and located between the lower support plate body and the second support sleeve.

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