Electric lifting and locking system for bench drill

Abstract

The present invention belongs to the technical field of bench drills, and particularly refers to an electric lifting and locking system for bench drills, comprising a base, a column arranged on the base, and a machine head slidably arranged on the column, two elastic parts are arranged on the rear side of the machine head, one side of the two elastic parts are provided with a clamping surface, a vertical groove is arranged between the two clamping surfaces, and a transverse hole is opened in the two clamping surfaces, a middle cylinder is passed through the transverse hole, an adjusting nut is sleeved on one end of the middle cylinder, and a locking hole is opened on the other end, a locking pin is passed through the locking hole, a locking arm is rotatably provided on the locking pin, a locking arc surface is arranged on one side of the locking arm, and the locking arc surface is eccentrically arranged. The purpose of the present invention is to provide an electric lifting and locking system for bench drills with a stable structure, fast operation, and accurate and reliable height adjustment.

Description

Technical Field

[0001] The invention belongs to the technical field of bench drills, and in particular relates to an electric lifting and locking system for a bench drill. Background Art

[0002] In the prior art, in order to adapt to the processing of workpieces of various thicknesses and heights, and because the drilling stroke of the bench drill is fixed, it is often necessary to frequently adjust the height from the machine head to the base table. After the height is adjusted, in order to eliminate shaking and swaying during the processing and improve the processing accuracy, the position of the machine head on the column must be firmly locked.

[0003] There are usually three common solutions for lifting and locking of existing bench drills:

[0004] 1. A handle device with a worm gear reduction is set in the machine head. The worm gear can achieve self-locking and will not cause the machine head to slide down during the adjustment process. A rack is set on the drill column. There is a gear at the worm gear reduction terminal. The gear is driven by manually shaking the lifting handle. The gear rotates on the rack of the column, driving the machine head to move up and down to achieve lifting.

[0005] The machine head locking method is also independent, the method is to slot the rear part of the machine body and insert the locking pin horizontally through the thread to lock it.

[0006] 2. An external spiral groove of the same length as the stroke is machined on the drill column, and a rotating handwheel with an internal spiral groove is horizontally set in the middle of the machine head coaxial with the column. The spiral groove can be self-locking and will not cause the machine head to slide down during the adjustment process. The external spiral groove on the column and the internal spiral groove of the rotating handle match each other. Rotating the handwheel left and right can drive the machine head to move up and down to achieve lifting and lowering of the machine head.

[0007] The machine head locking method is also independent, the method is to slot the rear part of the machine body and insert the locking pin horizontally through the thread to lock it.

[0008] 3. The drill head and column do not have any lifting device. The drill head is directly mounted on the column. When the drill head needs to be lifted or lowered, loosen the locking handle with the horizontally inserted locking pin in the slot at the rear of the machine body, move the machine body up and down to the appropriate position by hand, and then lock the machine body. The machine head cannot self-lock and is easy to slip during the adjustment process.

[0009] Objective disadvantages of the prior art: In the prior art 1, due to the use of a mechanical worm gear reduction device plus a gear rack device, the cost is high, the appearance is bloated and manual adjustment of the lifting is required, and the operating experience is poor.

[0010] In the prior art 2, since the spiral groove needs to be machined on the column and the inner spiral groove needs to be machined in the rotating handle, the machining is difficult. In addition, the handwheel needs to be operated with both hands, has a relatively large diameter, is costly, has a bloated appearance and needs to be manually raised and lowered, resulting in a poor operating experience.

[0011] In the prior art 3, although the solution of directly moving the machine body up and down by hand is simple and low-cost, it is very laborious to push the machine head up and down manually, especially when adjusting the machine head, and the adjustment accuracy is low, and the operating experience is very poor.

[0012] The locking methods of the above three solutions are all traditional, threaded cross pin plus handle locking methods. Summary of the invention

[0013] The purpose of the present invention is to provide an electric lifting and locking system for a bench drill which has a stable structure, fast operation, and accurate and reliable height adjustment.

[0014] The objective of the present invention is achieved in this way: an electric lifting and locking system for a bench drill comprises a base, a column arranged on the base, and a machine head slidably arranged on the column up and down, two elastic parts are arranged on the rear side of the machine head, one side of the two elastic parts is provided with a clamping surface, a vertical groove is provided between the two clamping surfaces, and transverse holes are opened in the two clamping surfaces, a middle cylinder is passed through the transverse hole, an adjusting nut is sleeved on one end of the middle cylinder, and a locking hole is opened on the other end, a locking pin is passed through the locking hole, a locking arm is rotatably provided on the locking pin, a locking arc surface is provided on one side of the locking arm, and the locking arc surface is eccentrically arranged, a stepped portion is formed on one side of the locking arm, a control switch and a safety switch for controlling the lifting of the machine head are provided on one side of the stepped portion, the control switch and the safety switch are arranged on the column, and the safety switch abuts against the stepped portion.

[0015] Preferably, the locking arc surface is formed with a boss, and the boss is engaged with a groove formed on the pressing surface. When the boss is engaged with the groove, the machine head is in a locked state.

[0016] Preferably, an operating handle is provided on the outer side of one end of the locking arm.

[0017] Preferably, a rack is provided on one side of the column, a driving gear is meshed on the rack, a motor assembly for driving the driving gear to rotate is provided on one side of the driving gear, and the motor assembly is fixedly integrated with the machine head.

[0018] Compared with the prior art, the present invention has the following outstanding and beneficial technical effects: the electric lifting and locking system of a bench drill in the present invention simplifies the cumbersome operation process of lifting the bench drill head on the market, and the bench drill head can be quickly locked and released by simply operating an angle with a locking arm. In addition, in order to improve work efficiency and reduce work intensity, the present invention adopts a motor-driven head lifting scheme, and the lifting and lowering of the head can be easily and quickly realized by simply operating the lifting button.

[0019] The present invention provides two safety protection schemes, mechanical and electronic. When the machine head is in a locked state, the lifting button cannot be operated and the power supply of the lifting motor will be cut off by the safety switch, which is a true double insurance.

[0020] The solution of the present invention uses fewer parts, the parts are simple and the cost is low. At the same time, due to the use of an electric lifting device, the operator's work intensity is low and the experience is very good. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a structural diagram of the present invention;

[0022] Figure 2 is an exploded view of the present invention;

[0023] Figure 3 It is a structural diagram of the head sliding structure of the present invention;

[0024] Figure 4 is an exploded view of the nose of the present invention;

[0025] Figure 5 It is a partial exploded view of the nose of the present invention;

[0026] Figure 6 This is a simplified structural diagram of the machine head in a locked state of the present invention;

[0027] Figure 7 It is a structural diagram of the present invention when the machine head is in an open state. DETAILED DESCRIPTION

[0028] The present invention is further described below with reference to specific embodiments.

[0029] like Figure 1-7 As shown, an electric lifting and locking system for a bench drill includes a main body 1-1 of a machine head 1 with a cylindrical circular hole 1-14 at the rear, the circular hole 1-14 and a column 2-2 arranged on a base 2 cooperate with each other, and the machine body 1 can move up and down on the column 2-2.

[0030] A vertical groove 1-12 is opened in the middle of the circular hole 1-14 at the rear of the main body 1-1, and the outer sides of the vertical groove are left and right clamping surfaces A and B. When these two clamping surfaces are clamped, the vertical groove 1-12 will become narrower, and then the part of the inner hole of the circular hole 1-14 corresponding to the vertical groove 1-12 will be reduced, so that the main body 1-1 of the machine head 1 is firmly locked on the column 2-2, thereby realizing the locking of the machine head.

[0031] The vertical slot 1-12 at the rear of the main body 1-1 has a horizontal hole 1-11 in the middle of the vertical slot in a direction perpendicular to the pressing surface 1-10, and a locking pin 1-2-4 is arranged in the horizontal hole 1-11. The cylinder 1-2-4-2 in the middle of the locking pin 1-2-4 matches the horizontal hole 1-11 of the main body 1-1, and the left end 1-2-4-1 of the locking pin 1-2-4 is an adjustment locking hole, which may usually be an adjustment nut, or other types of stoppers, which can adjust the axial position and can complete the locking function by sticking to the right outer pressing surface of the vertical slot 1-12.

[0032] The right end of the locking pin 1-2-4 is provided with a locking hole which is perpendicular to the axis of the cylinder 1-2-4-2 in the middle of the locking pin 1-2-4.

[0033] 1-2-4-3, a round pin hole is arranged in the middle of the locking hole 1-2-4-3, and the pin hole 1-2-2-1 of the locking arm 1-2-2 corresponds to the locking hole 1-2-4-3 coaxially. The locking pin 1-2-3 vertically penetrates the pin hole of the locking arm 1-2-2 and the pin hole of the locking hole 1-2-4-3. Limits are arranged at the upper and lower ends of the locking pin 1-2-3 to prevent it from falling off.

[0034] The locking arm 1-2-2 can rotate at a certain angle in the horizontal direction around the axis of the locking pin 1-2-3.

[0035] The pin hole 1-2-2-1 and the locking arc surface 1-2-2-5 of the locking arm 1-2-2 are eccentrically designed, and their axes are parallel to each other but not concentric. The locking arm clamping surface 1-2-2-5 is axially designed with a boss 5, and the boss 5 is consistent with the groove 1-10-1 of the main body clamping surface 1-10. The two can enable the locking arm 1-2-2 to form a reliable positioning relationship in a fixed position.

[0036] An operating handle 1-2-1 is installed at the right end of the locking arm 1-2-2. Pushing the operating handle 1-2-1 in the horizontal direction can drive the locking arm 1-2-2 to rotate around the pin hole 1-2-2-1, thereby completing the function of locking or releasing the machine head 1.

[0037] The machine head 1 is in locked state: at this moment, the locking arm 1-2-2 is located close to the side wall of the machine head. Since the locking arc surface 1-2-2-4 is eccentrically designed, the distance 1-2-2-2 between the pin hole 1-2-2-1 of the locking arm 1-2-2 and the corresponding pressing surface A1-10 is at a maximum value. Since the distance between the locking hole 1-2-4-1 at the left end of the locking pin 1-2-4 and the locking pin hole 1-2-4-3 at the right end of the locking pin 1-2-4 is fixed, the pressing surface A1-10 and the corresponding pressing surface B1-13 will be squeezed by the locking arc surface 1-2-2-4 and the pressing surface B1-13 of the locking pin 1-2-4 respectively, resulting in the distance of the vertical groove 1-12 at the rear end of the main body 1-1 shrinking, and the main body 1-1 is firmly locked on the column 2-2, thereby realizing the locking of the machine head.

[0038] The machine head 1 is in the locked release state: the locking arm 1-2-2 operating handle 1-2-1 is pushed outward to a certain angle. At this moment, the distance 1-2-2-2 between the pin hole 1-2-2-1 of the locking arm 1-2-2 and the corresponding pressing surface 1-10 becomes smaller. Since the distance between the locking hole 1-2-4-1 at the left end of the locking pin 1-2-4 and the locking pin hole at the right end of the locking pin 1-2-4 is fixed, the squeezing pressure of the locking arc surface 1-2-2-4 and the left end pressing surface of the locking pin 1-2-4 on the pressing surface 1-10 and the corresponding pressing surface 1-13 is released, resulting in the distance of the vertical groove 1-12 at the rear end of the main body 1-1 returning to its original state. The main body 1-1 is then released from the locking relationship with the column 2-2, and the machine head 1 can move freely up and down on the column 2-2.

[0039] Electric lifting of machine head:

[0040] The side wall of the column 2-2 is installed with a rack 2-3, and the main body of the machine head 1 is installed with a motor assembly 1-6, which is composed of a micro motor and a reduction mechanism. A driving gear 1-7 is installed at the output end of the motor assembly 1-6, and the driving gear 1-7 is meshed with the rack 2-3. The driving gear 1-7 is controlled to rotate forward and reverse, and the driving gear 1-7 moves up and down on the rack 2-3. Since the motor assembly 1-6 and the main body 1-1 are fixed as one body, the driving gear 1-7 moves up and down on the rack 2-3, and when moving, it will also drive the main body 1-1 to move up and down on the column 2-2.

[0041] The lifting motor control switch 1-9 can control the forward and reverse rotation of the motor. 1-9-1 is the lifting push button. When it is pushed upward, the motor drives the driving gear to rotate counterclockwise, driving the main body 1-1 to move up; when the lifting push button is pushed downward, the motor drives the driving gear to rotate clockwise, driving the main body 1-1 to move down.

[0042] Electric lifting safety protection:

[0043] If the machine head 1 is in the locked state and the lifting button 1-9-1 is mistakenly operated to energize the motor assembly 1-6, the machine head 1 is in the locked state at this time, and the motor assembly 1-6 cannot run after being energized, causing the motor to be blocked, which can easily cause damage to the motor assembly 1-6 and related electrical components.

[0044] The present invention provides a dual mechanical and electronic protection scheme to prevent misoperation, so as to ensure the safety of motors and electronic components:

[0045] Mechanical protection solutions:

[0046] When the machine head 1 is in the locked state, the locking arm 1-2-2 is located close to the side wall of the machine head, and the entire arm body of the locking arm 1-2-2 completely blocks the lifting push button 1-9-1. If the locking arm 1-2-2 is not removed, the lifting push button 1-9-1 cannot be touched and operated, so that the lifting switch 1-9 cannot be powered on to achieve the protection purpose.

[0047] When the machine head 1 is in the released state, the locking arm 1-2-2 is in a position away from the side wall of the machine head, and the locking arm 1-2-2 cannot block the lifting push button 1-9-1, so the lifting push button 1-9-1 becomes operable.

[0048] Electronic protection scheme:

[0049] The safety switch 1-8 is a normally closed non-self-locking switch, and 1-8-1 is the operating rod of the safety switch 1-8. When the end of the operating rod 1-8-1 is pushed, the safety switch 1-8 changes to the circuit-breaking state. The safety switch 1-8 is connected in series in the power supply circuit of the motor assembly 1-6 to control the on-off of the circuit.

[0050] When the machine head 1 is in a locked state, the locking arm 1-2-2 is located close to the side wall of the machine head, and the inner end surface of the locking arm 1-2-2 will press against the head end of the operating rod 1-8-1 of the safety switch 1-8. At this time, the power supply circuit of the motor assembly 1-6 cannot supply power to the motor due to the disconnection of the safety switch 1-8, so the motor assembly 1-6 cannot be energized when the machine head 1 is in a locked state.

[0051] When the machine head 1 is in the released state, the locking arm 1-2-2 is in a position away from the side wall of the machine head, and the inner end surface of the locking arm 1-2-2 will be away from the head end of the operating rod 1-8-1 of the safety switch 1-8. The switch 1-8 changes from the open circuit state to the normally closed state. At this time, the power supply circuit of the motor assembly 1-6 resumes power supply, and the lifting push button 1-9-1 is operated, and the motor assembly 1-6 can drive the machine head 1 to move up and down.

[0052] like Figure 1 As shown:

[0053] Diagram of the basic external structure of a bench drill: The main body 1-1 is the main component of the machine head 1, which is equivalent to the bracket and shell of other parts. The column 2-2 is vertically installed on the base 2-1 as a component of the base assembly 2. The machine head 1 is vertically installed on the column 2-2 and can move up and down along 2-2 to adapt to the height requirements of different processing parts.

[0054] 1-2 is the machine head locking and releasing device of the present invention, and 1-5 is the drill chuck for clamping the drill bit.

[0055] like Figure 2 Figure 3 As shown:

[0056] The basic structure of the bench drill:

[0057] The side wall of the column 2-2 is installed with a rack 2-3, and 2-2-1 is a fixing screw of the rack, which can fix the rack on the column 2-2. The main body of the machine head 1 is installed with a motor assembly 1-6, which is composed of a micro motor and a reduction mechanism. A driving gear 1-7 is installed at the output end of the motor assembly 1-6, and the driving gear 1-7 is meshed with the rack 2-3. The driving gear 1-7 is controlled to rotate forward and reverse, and the driving gear 1-7 moves up and down on the rack 2-3. Since the motor assembly 1-6 is fixed to the main body 1-1, the driving gear 1-7 will also drive the main body 1-1 to move up and down on the column 2-2 when the rack 2-3 moves up and down.

[0058] The lifting control switch 1-9 can control the forward and reverse rotation of the motor. The safety switch 1-8 is a self-locking protection switch, which can be interlocked with the locking arm to ensure that the motor and electronic components will not be powered when the machine head is locked.

[0059] like Figure 4 and Figure 5 As shown:

[0060] Schematic diagram of the electric lifting and locking device of the bench drill head:

[0061] Components in the figure: 1. Machine head, 1-1 main body, 1-14 main body column hole, 1-2. Locking and releasing device, 1-2-1. Operating handle, 1-2-2. Locking arm, 1-2-3. Locking pin, 1-2-2-1. Locking pin hole, 1-2-2-4. Locking arm clamping surface, 1-9. Lifting control switch, 1-8. Safety switch, 1-10. Clamping surface A, 1-10-1. Groove, 1-11, main body locking pin hole, 1-12. Vertical groove, 1-13. Clamping surface B, 1-2-4. Locking pin, 1-2-4-1. Locking pin adjustment locking hole, 1-2-4-2. Middle cylinder, 1-2-4-3. Locking pin hole.

[0062] like Figure 6 Shown: Schematic diagram of the electric lifting and locking device of the bench drill head in the locked state.

[0063] Components in the figure:

[0064] 1-1 Main body, 1-2-1. Operating handle, 1-2-2. Locking arm, 1-2-2-1. Locking arm hole, 1-2-3. Locking pin, 1-2-2-2. Locking arm locking area, 1-10. Pressing surface A, 1-12. Vertical groove, 1-2-4-1. Locking pin adjustment locking hole, 1-13. Pressing surface B. 1-2-2-4. Locking arc surface, 1-9. Lifting control switch button, 1-8. Safety switch operating lever.

[0065] When in the locked state, the locking arm 1-2-2 is located close to the side wall of the main body 1-1. Since the locking arc surface 1-2-2-4 is eccentrically designed, at this moment, the distance 1-2-2-2 between the pin hole 1-2-2-1 of the locking arm 1-2-2 and the corresponding pressing surface A1-10 is a maximum. Since the distance between the locking hole 1-2-4-1 at the left end of the locking pin 1-2-4 and the locking pin hole at the right end of the locking pin 1-2-4 is fixed, the pressing surface A1-10 and the corresponding pressing surface B1-13 will be squeezed by the locking arc surface 1-2-2-4 and the pressing surface of the locking pin 1-2-2-4 respectively, resulting in the distance of the vertical groove 1-12 at the rear end of the main body 1-1 shrinking, and the main body 1-1 is firmly locked on the column 2-2, thereby realizing the locking of the machine head.

[0066] When in the locked state, the locking arm 1-2-2 is located close to the side wall of the machine head, and the inner end surface of the locking arm 1-2-2 will press against the head end of the operating rod 1-8-1 of the safety switch 1-8. At this time, the power supply circuit of the motor assembly 1-6 cannot supply power to the motor due to the open circuit of the safety switch 1-8, so the motor assembly 1-6 cannot be energized when the machine head 1 is in the locked state.

[0067] like Figure 7 Shown: Schematic diagram of the electric lifting and locking device of the bench drill head in the released state.

[0068] Components in the figure:

[0069] 1-1 Main body, 1-2-1. Operating handle, 1-2-2. Locking arm, 1-2-2-1. Locking arm hole, 1-2-3. Locking pin, 1-2-2-2. Locking arm locking area, 1-10. Pressing surface A, 1-12. Vertical groove, 1-2-4-1. Locking pin adjustment locking hole, 1-13. Pressing surface B. 1-2-2-4. Locking arm pressing surface, 1-9. Lifting control switch push button, 1-8. Safety switch operating lever.

[0070] Release state: push the locking arm 1-2-2 operating handle 1-2-1 outward to a certain angle. At this moment, the distance 1-2-2-2 between the pin hole 1-2-2-1 of the locking arm 1-2-2 and the corresponding pressing surface 1-10 becomes smaller. Since the distance between the locking hole 1-2-4-1 at the left end of the locking pin 1-2-4 and the locking pin hole 1-2-4-3 at the right end of the locking pin 1-2-4 is fixed, the squeezing pressure of the locking arc surface 1-2-2-4 and the left end pressing surface of the locking pin 1-2-4 on the pressing surface 1-10 and the corresponding pressing surface 1-13 is released, resulting in the distance of the vertical groove 1-12 at the rear end of the main body 1-1 returning to its original state. The main body 1-1 is then released from the locking relationship with the column 2-2, and the machine head 1 can move freely up and down on the column 2-2.

[0071] When in the released state, the locking arm 1-2-2 is in a position away from the side wall of the machine head, and the inner end surface of the locking arm 1-2-2 will be away from the head end of the operating rod 1-8-1 of the safety switch 1-8. The switch 1-8 changes from the open circuit state to the normally closed state. At this time, the power supply circuit of the motor assembly 1-6 resumes power supply, and the lifting push button 1-9-1 is operated, and the motor assembly 1-6 can drive the machine head 1 to move up and down.

[0072] This patent involves an electric lifting and locking system for a bench drill head. A locking arm that can be pushed at an angle in the horizontal direction is used on the side of the bench drill head. When the head is locked, the locking arm is close to the side of the main body of the head and has a positioning device to lock the position. By pushing the locking arm outward at an angle, the head and the bench drill column can release the locking relationship.

[0073] The state of the locking arm and the machine head lifting operation button and the safety switch are mutually locked. When the locking arm is in the locked position, the machine head lifting operation button cannot be operated, the safety switch is in the off state, and the lifting motor cannot be started. When the locking arm is in the released position, the machine head lifting operation button can be operated, the safety switch is in the on state, and the lifting motor can be started.

[0074] As a priority, the distance from the contact line between the outer locking cylindrical surface of the locking arm and the contact surface of the main body of the machine head to the axis of the locking pin is inconsistent. This distance is large when in the locked state and small when in the released state.

[0075] As a preference, the outer locking cylindrical curved surface of the locking arm may be an arc surface but is not concentric with the arc surface of the locking pin hole.

[0076] As a preference, the outer locking curved surface of the locking arm may be other types of irregular curved surfaces, such as a cam surface.

[0077] As a priority, the working state of the locking arm is interlocked with the machine head lifting operation button. When the locking arm is in the locked position, the lifting operation button cannot be operated. When the locking arm is in the released position, the lifting operation button can be operated.

[0078] As a priority, the working state of the locking arm is interlocked with the safety switch that controls the lifting motor. When the locking arm is in the locked position, the safety switch is in the disconnected state, and the motor is not powered; when the locking arm is in the released position, the safety switch is in the connected state, and the motor can be powered on.

[0079] The above embodiments are only preferred embodiments of the present invention and are not intended to limit the protection scope of the present invention. Therefore, any equivalent changes made based on the structure, shape, and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. An electric lifting and locking system for a bench drill, characterized in that: The invention comprises a base (2-1), a column (2-2) arranged on the base (2-1), and a machine head (1) slidably arranged on the column (2-2) up and down, wherein two elastic parts (4) are arranged on the rear side of the machine head (1), one side of each of the two elastic parts (4) is provided with a pressing surface (1-10), a vertical groove (1-12) is arranged between the two pressing surfaces (1-10), a transverse hole (1-11) is opened in each of the two pressing surfaces (1-10), a middle cylinder (1-2-4-2) is passed through the transverse hole (1-11), one end of the middle cylinder (1-2-4-2) is provided with an adjusting locking end (1-2-4-1), and the other end is provided with a locking hole (1-2-4-3), A locking pin (1-2-3) is inserted into the locking hole (1-2-4-3), a locking arm (1-2-2) is rotatably provided on the locking pin (1-2-3), a locking arc surface (1-2-2-4) is provided on one side of the locking arm (1-2-2), the locking arc surface (1-2-2-4) is eccentrically arranged, a step portion (6) is formed on one side of the locking arm (1-2-2), a control switch (1-9) and a safety switch (1-8) for controlling the lifting of the machine head (1) are provided on one side of the step portion (6), the control switch (1-9) and the safety switch (1-8) are arranged on the column (2-2), and the safety switch (1-8) abuts against the step portion (6); The locking arc surface (1-2-2-4) is formed with a boss (5), and the boss (5) is engaged with a groove (1-10-1) provided on the pressing surface (1-10); when the boss (5) is engaged with the groove (1-10-1), the machine head (1) is in a locked state; An operating handle (1-2-1) is provided on the outer side of one end of the locking arm (1-2-2).

2. The electric lifting and locking system for a bench drill according to claim 1, characterized in that: A rack (2-3) is provided on one side of the upright column (2-2), a driving gear (1-7) is meshed on the rack (2-3), a motor assembly (1-6) for driving the driving gear (1-7) to rotate is provided on one side of the driving gear (1-7), and the motor assembly (1-6) and the machine head (1) are fixedly integrated.

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