Sensor unit and mortar mixer equipped with sensor unit

Abstract

To prevent an operator's hand from touching an agitation blade.SOLUTION: A sensor unit 20 is provided in a portable mortar mixer 100 having a mixing tank 1 for storing a mortar material, a mixing blade 2 provided in the mixing tank 1 for mixing the mortar material, a cover 3 for covering the opening of the mixing tank 1, and a controller 7 for controlling the driving of the mixing blade 2. The sensor unit 20 includes a sensor dog 21 detachably attached to the cover 3, a sensor body 23 detachably attached to the mixing tank 1 and detecting the sensor dog 21, and a controller 10 that controls the driving of the mixing blade 2 based on a signal input from the sensor body 23. When the sensor dog 21 is no longer detected, the sensor body 23 outputs the signal to the controller 10 to stop driving the mixing blade 2.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a sensor unit and a mortar mixer equipped with the sensor unit. [Background technology]

[0002] Patent Document 1 discloses a mortar mixer that includes a cylindrical agitation vessel with a bottom that is detachably mounted on a machine frame, and an agitator (agitation blade) that agitates cement mortar in the agitation vessel. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Publication No. 6-166020 Summary of the Invention [Problem to be solved by the invention]

[0004] In a mortar mixer such as that described in Patent Document 1, the top of the mixing vessel is open. Therefore, if an operator accidentally puts their hand inside the mixing vessel while the mortar mixer is running, their hand may come into contact with the rotating mixing body, which could lead to an accident.

[0005] Therefore, it is conceivable to provide a cover on the top of the mixing vessel to cover the opening of the mixing vessel. However, even with such a cover, if an operator opens the cover and puts their hand into the mixing vessel while the mortar mixer is running, their hand may come into contact with the rotating mixing body, which could lead to an accident.

[0006] The present invention aims to prevent an operator's hands from coming into contact with the stirring blades of a rotating mortar mixer. [Means for solving the problem]

[0007] The present invention is a sensor unit to be installed in a portable mortar mixer having a mixing tank that contains mortar material, mixing blades that are installed in the mixing tank and mix the mortar material, a cover that covers the opening of the mixing tank, and a first control unit that controls the drive of the mixing blades, and the sensor unit comprises a detection object that is detachably attached to the cover, a detection unit that is detachably attached to the mixing tank and detects the detection object, and a second control unit that controls the drive of the mixing blades based on a signal input from the detection unit, and when the detection unit no longer detects the detection object, it outputs a signal to the second control unit to stop the drive of the mixing blades. [Effects of the Invention]

[0008] According to the present invention, it is possible to prevent the worker's hands from coming into contact with the stirring blades of the rotating mortar mixer. [Brief explanation of the drawings]

[0009] [Figure 1] FIG. 1 is a front view of a mortar mixer according to an embodiment of the present invention. [Figure 2] FIG. 10 is a plan view of the mortar mixer according to the embodiment of the present invention, showing a state in which the movable member overlaps with region R2 of the cover. [Figure 3] FIG. 10 is a plan view of the mortar mixer according to the embodiment of the present invention, showing a state in which the movable member is in a position different from region R2 of the cover. [Figure 4] FIG. 2 is an exploded view of the vicinity of the cover of the mortar mixer according to the embodiment of the present invention. [Figure 5] FIG. 2 is a front view of the vicinity of the sensor unit of the mortar mixer according to the embodiment of the present invention. [Figure 6] FIG. 2 is a plan view of the vicinity of a sensor unit of the mortar mixer according to the embodiment of the present invention. [Figure 7] 4A and 4B are diagrams illustrating the mounting structure of the first bracket of the present invention. [Figure 8] 10A and 10B are diagrams illustrating the mounting structure of the second bracket of the present invention. [Figure 9]10A and 10B are diagrams illustrating the relationship between the sensor dog and the elongated hole when opening and closing the cover in the mortar mixer according to the embodiment of the present invention. DETAILED DESCRIPTION OF THE INVENTION

[0010] Hereinafter, a mortar mixer 100 according to an embodiment of the present invention will be described with reference to the drawings.

[0011] The mortar mixer 100 of this embodiment is a portable mortar mixer. As shown in Figures 1 to 3, the mortar mixer 100 includes a mixing tank 1 that contains mortar materials such as cement, water, and sand, a mixing blade 2 that is provided in the mixing tank 1 and mixes the mortar materials, a mesh cover 3 that covers the opening of the mixing tank 1, a support base 4 that supports the mixing tank 1, a motor 5 that rotates the mixing blade 2, and a controller 7 (first control unit) that controls the motor 5.

[0012] The mixing tank 1 is a cylindrical metal container with a bottom. The mixing tank 1 is detachably placed on top of the support stand 4, but the two may also be fixed together as a single unit. A through-hole (not shown) is provided in the center of the bottom of the mixing tank 1, through which the rotation shaft 2a of the mixing blade 2 is inserted. In addition, a discharge port 1a (see Figures 2 and 3) is provided near the outer edge of the bottom of the mixing tank 1, for discharging the mixed mortar. A chute (not shown) is provided below the discharge port 1a to guide the mixed mortar.

[0013] 2 and 3, a shutter member 1b for opening and closing the discharge port 1a is provided on the outside of the bottom of the stirring tank 1. The shutter member 1b is provided with a lever 1c for manually opening and closing the shutter member 1b.

[0014] The mixing blade 2 is provided in the mixing tank 1 and mixes the mortar material introduced into the mixing tank 1. The rotating shaft 2a of the mixing blade 2 is connected to the drive shaft of the motor 5 attached below the mixing tank 1. As a result, by driving the motor 5, the mixing blade 2 is rotated and the mortar material in the mixing tank 1 is mixed.

[0015] The cover 3 is formed in a circular shape to cover the opening on the upper surface side of the mixing tank 1. The cover 3 has a plurality of annular members 3a arranged at intervals in the radial direction, a plurality of arc-shaped members 3b arranged at intervals in the radial direction, and radial members 3c extending in the radial direction and connecting the annular members 3a and the arc-shaped members 3b.

[0016] The annular members 3a, the arc-shaped members 3b, and the radial members 3c are made of metal rod-shaped members. The annular members 3a and the arc-shaped members 3b are arranged alternately in the radial direction.

[0017] 2 and 3, in this embodiment, the arc-shaped member 3b is formed in an arc shape with a central angle θ1 of approximately 240° centered on the center O of the cover 3. As a result, the cover 3 is provided with a region R1 where the annular member 3a and the arc-shaped member 3b are provided, and a region R2 where only the annular member 3a is provided (see also FIG. 4).

[0018] A plurality of radial members 3c are provided at approximately equal intervals in the circumferential direction around the center O of the cover 3, and are connected to the annular member 3a and the arc-shaped member 3b by welding at the locations where they intersect.

[0019] As shown in Figures 2 to 4, a movable member 6 is attached to the cover 3. The movable member 6 has a plurality of arc-shaped members 3e and radial members 3f that extend radially and connect the arc-shaped members 3e to each other. The arc-shaped members 3e are formed to have approximately the same radius of curvature as the plurality of annular members 3a and arc-shaped members 3b. The movable member 6 is formed in a shape that covers the region R2, specifically, in a fan shape with a central angle θ2 of approximately 120° centered on the center O of the cover 3.

[0020] The movable member 6 moves on the upper surface of the cover 3 in the circumferential direction around the center O of the cover 3. Specifically, the movable member 6 moves between a closed position (position shown in FIG. 2) where it overlaps with region R2 and an open position (position shown in FIG. 3) where it does not overlap with region R2 (displaced from region R2). In the mortar mixer 100 of this embodiment, by displacing the movable member 6 from region R2, mortar material can be introduced into the mixing tank 1 from region R2 with the cover 3 attached. Furthermore, by moving the movable member 6 to a position where it covers region R2, it is possible to prevent an operator from reaching into the mixing tank 1 through region R2.

[0021] As shown in FIG. 1, the support base 4 has a frame body 4a made of a bent metal pipe, and a gripping portion 4b made of a bent metal pipe and attached to the frame body 4a.

[0022] The frame 4a supports the mixing tank 1 from below. A plurality of wheels 4c are attached to the lower end of the frame 4a. This allows the mortar mixer 100 to move with the mixing tank 1 placed on the support base 4. Note that the travel means is not limited to the wheels 4c and may be other means.

[0023] The controller 7 has a switch 7a for turning the motor 5 on and off, a control circuit 7b for controlling the driving of the stirring blade 2 (motor 5), and a case 7c for accommodating the control circuit 7b.

[0024] In the mortar mixer 100 configured in this manner, a cover 3 is provided to cover the opening of the mixing tank 1, thereby preventing an operator from accidentally putting his or her hand into the mixing tank 1 and touching the rotating mixing blades 2.

[0025] However, it is conceivable that an operator may lift the cover 3 and reach into the mixing vessel 1 while the agitator blade 2 is rotating, or that the agitator blade 2 may stop unintentionally, and when an operator lifts the cover 3 and reaches into the mixing vessel 1 to restore operation, the agitator blade 2 may suddenly start moving and come into contact with the operator's hand. If an operator reaches into the mixing vessel 1 while the agitator blade 2 is rotating, or while there is a possibility that the agitator blade 2 may start rotating, there is a risk of an accident occurring if the operator reaches into the mixing vessel 1.

[0026] Therefore, the mortar mixer 100 of this embodiment stops the stirring blades 2 when it detects that the cover 3 is opened. Specifically, the mortar mixer 100 is provided with a sensor unit 20 that detects whether the cover 3 is opened or closed. The sensor unit 20 of this embodiment will be specifically described with reference to Figs. 5 to 9.

[0027] As shown in Figures 5 and 6, the sensor unit 20 comprises a rod-shaped sensor dog 21 (detection object) that can be removably attached to the cover 3, a first bracket 22 for attaching the sensor dog 21 to the cover 3, a sensor main body 23 (detection section) that can be removably attached to the stirring tank 1 and detects the sensor dog 21, a second bracket 24 for attaching the sensor main body 23 to the stirring tank 1, and a controller 10 (second control section) to which a signal detected by the sensor main body 23 is input.

[0028] The sensor unit 20 (first bracket 22 and second bracket 24) is attached to a portion of the region R1 of the cover 3 that does not interfere with the opening and closing of the movable member 6 (see FIGS. 2 and 3, etc.).

[0029] The sensor dog 21 of this embodiment is a rod-shaped member made of a magnetic material and is sized to be able to be inserted into an elongated hole 24d formed in a second bracket 24, which will be described later.

[0030] 5 and 6, the first bracket 22 has a flat body portion 22a attached to the cover 3, a holding portion 22b that holds the sensor dog 21, and a plurality of through holes 22c (see FIG. 7) formed in the body portion 22a and through which the U-bolts 26 are inserted. One end of the sensor dog 21 is fixed to the holding portion 22b by welding or the like.

[0031] 7, threaded portion 26a of U-bolt 26 is inserted into through-hole 22c. Threaded portion 26a of U-bolt 26 is inserted into through-hole 22c so as to sandwich annular member 3a of cover 3 between first bracket 22 and arc-shaped portion 26b of U-bolt 26, and nut 27 is gradually tightened onto threaded portion 26a, thereby fixing first bracket 22 to cover 3.

[0032] The sensor body 23 of this embodiment is a normally open type inductive proximity sensor. The sensor body 23 is attached to the upper end portion of the stirring vessel 1 by a second bracket 24. The sensor body 23 is electrically connected to the controller 10 via a cable (see FIG. 1).

[0033] As shown in Figures 5, 6, and 8, the second bracket 24 has a main body portion 24a, a holding portion 24b attached to the main body portion 24a and holding the sensor main body 23, an attachment portion 24c that fits into the upper end portion of the stirring tank 1, and a long hole 24d formed to penetrate the main body portion 24a and through which the sensor dog 21 is inserted.

[0034] As shown in Fig. 8 and other figures, main body 24a is made of a metal plate-like member with a substantially L-shaped cross section. Holder 24b is made of a plate-like member provided in a direction perpendicular to the two faces that make up the L shape of main body 24a, and is fixed to these two faces that make up the L shape. As shown in Figs. 5 and 6, holder 24b holds sensor main body 23 in a substantially horizontal direction.

[0035] As shown in Fig. 8, the mounting portion 24c extends from one end of the main body portion 24a and has a generally U-shaped cross section. As shown in Figs. 5 and 6, in this embodiment, a pair of mounting portions 24c are provided on both ends of the main body portion 24a. The mounting portions 24c are provided with internal thread portions 24e that penetrate the mounting portions 24c. As shown in Fig. 8, the second bracket 24 is positioned so that the mounting portions 24c are hooked onto the upper end portion of the agitation tank 1, and the bolt 30 is inserted into the internal thread portion 24e and screwed in so as to press against the upper end portion of the agitation tank 1, thereby fixing the second bracket 24 to the agitation tank 1.

[0036] 6 and other figures, the elongated hole 24d penetrates the main body 24a and is formed in a generally elliptical or rectangular shape. The elongated hole 24d is formed so that its longitudinal direction is aligned with the radial direction of the cover 3 when the second bracket 24 is attached to the stirring tank 1.

[0037] When attaching the first bracket 22 and the second bracket 24 to the cover 3 and the stirring tank 1, respectively, the first bracket 22 and the second bracket 24 are attached so that when the cover 3 is placed on the opening portion of the stirring tank 1, the sensor dog 21 fixed to the first bracket 22 is inserted into the long hole 24d formed in the second bracket 24 and faces the sensor main body 23 held by the holding portion 24b of the second bracket 24.

[0038] Next, the controller 10 will be described.

[0039] 1, the controller 10 is provided between the controller 7 and a power supply (not shown) on an electric circuit. The controller 10 has, for example, a power socket that is connected to the power plug of the controller 7, and a power plug that is connected to the power supply. This allows the controller 10 to be easily connected between the controller 7 and the power supply (not shown).

[0040] The controller 10 also has a switch 11 for turning the motor 5 on and off, a control circuit 12 to which a signal from the sensor body 23 is input, and a case 13 for accommodating the control circuit 12. The controller 10 is attached so as to hang from the grip portion 4b of the support base 4 by hooking a hook 14 attached to the case 13 onto the grip portion 4b of the support base 4. This eliminates the need to carry the controller 10 by hand when moving the mortar mixer 100. The controller 10 may be attached to the grip portion 4b by other means, or may be attached to the mixing tank 1 instead of the grip portion 4b.

[0041] The switch 11 is a manual switch that connects or disconnects an electric circuit that connects the controller 7 and a power source (not shown). In the mortar mixer 100 of this embodiment, the motor 5 can be turned on and off not only by operating the switch 7a of the controller 7 but also by operating the switch 11.

[0042] The control circuit 12 has a switching circuit that switches between supplying and cutting off current from the controller 10 to the controller 7 based on a signal input from the sensor main body 23. The function of the control circuit 12 will be described later.

[0043] In the sensor unit 20 of this embodiment, when the sensor dog 21 is located within a predetermined range facing the sensor main body 23, a switch built into the sensor main body 23 is turned ON. On the other hand, when the sensor dog 21 is located outside the predetermined range facing the sensor main body 23, the switch built into the sensor main body 23 is turned OFF.

[0044] When the switch built into the sensor main body 23 is ON, the application of current from the control circuit 12 to the control circuit 7b (motor 5) is permitted, and when the switch built into the sensor main body 23 is OFF, the application of current from the control circuit 12 to the control circuit 7b (motor 5) is cut off.

[0045] The operation of the sensor unit 20 configured in this manner will now be described in detail.

[0046] When using the mortar mixer 100, the cover 3 is placed on the opening of the mixing vessel 1 so that the sensor dog 21 is inserted into the elongated hole 24d of the second bracket 24. At this time, as described above, the sensor dog 21 is positioned within a predetermined range facing the sensor body 23, and the switch in the sensor body 23 is turned ON. As a result, application of current from the control circuit 12 to the control circuit 7b (motor 5) is permitted. Thus, by turning ON the switch 7a of the controller 7 and the switch 11 of the controller 10, current is applied from the power source through the control circuit 12 and the control circuit 7b to the motor 5, driving the motor 5 and rotating the mixing blade 2.

[0047] If an attempt is made to open the cover 3 while the agitating blade 2 is rotating, the sensor dog 21 attached to the cover 3 moves. When the sensor dog 21 moves to a position outside the predetermined range facing the sensor main body 23 (shifts from the position facing the sensor main body 23), the switch built into the sensor main body 23 turns OFF. As a result, the application of current from the control circuit 12 to the control circuit 7b (motor 5) is cut off. As a result, even if the switch 7a of the controller 7 and the switch 11 of the controller 10 are ON, the application of current from the control circuit 12 to the control circuit 7b (motor 5) is cut off, so that the motor 5 stops and the agitating blade 2 also stops rotating.

[0048] As described above, in the sensor unit 20 of this embodiment, if the cover 3 is opened while the agitator blade 2 is rotating, the agitator blade 2 stops. This ensures safety when an operator inadvertently tries to insert his or her hand into the agitator vessel 1 while the agitator blade 2 is rotating. In other words, it is possible to prevent an accident caused by the operator's hand touching the rotating agitator blade 2.

[0049] When at least one of the switch 7a of the controller 7 and the switch 11 of the controller 10 is OFF, the motor 5 is stopped, and therefore the stirring blade 2 is stopped regardless of whether the cover 3 is open or closed.

[0050] Next, the effect of the elongated hole 24d provided in the second bracket 24 will be described.

[0051] For example, if the through hole through which the sensor dog 21 provided in the second bracket 24 is inserted is a circular hole with a diameter slightly larger than the outer diameter of the sensor dog 21, the cover 3 cannot be tilted when opening or closing the cover 3.

[0052] In contrast, in this embodiment, as described above, the second bracket 24 is attached to the mixing tank 1 so that the longitudinal direction of the elongated hole 24d is aligned with the radial direction of the cover 3. Therefore, in the mortar mixer 100, when the cover 3 is opened or closed with the sensor dog 21 inserted in the elongated hole 24d, the sensor dog 21 can tilt relative to the second bracket 24 while being guided along the longitudinal direction of the elongated hole 24d, as shown in FIG. 9. In other words, in the mortar mixer 100, by forming the through-hole through which the sensor dog 21 is inserted as the elongated hole 24d, the elongated hole 24d and the sensor dog 21 can form a fulcrum for opening and closing the cover 3. This allows the cover 3 to be easily opened and closed, for example, when it is desired to temporarily open or close the cover 3.

[0053] In the mortar mixer 100, a handle for opening and closing the cover 3 may be provided in an area on the opposite side of the sensor dog 21 across the center O of the cover 3, preferably in a position on the opposite side (facing) of the sensor dog 21 across the center O of the cover 3. This allows the cover 3 to be opened and closed with one hand, making opening and closing easier.

[0054] The sensor unit 20 and the mortar mixer 100 configured as above have the following advantages.

[0055] The mortar mixer 100 of this embodiment has a mesh cover 3 that covers the opening of the mixing tank 1. This prevents an operator from putting his or her hand into the mixing tank 1.

[0056] Furthermore, by providing the sensor unit 20 to the mortar mixer 100, when an attempt is made to open the cover 3, a signal to stop the driving of the agitator blade 2 is output from the sensor body 23 to the controller 10 (control circuit 12), and the controller 10 (control circuit 12) cuts off the application of current to the control circuit 7b (motor 5). This stops the agitator blade 2, thereby reliably preventing the operator's hand from touching the rotating agitator blade 2.

[0057] Furthermore, in the sensor unit 20 of this embodiment, the sensor dog 21 can be detachably attached to the cover 3 by the first bracket 22, and the sensor main body 23 can be detachably attached to the mixing tank 1 by the second bracket 24. This allows the sensor unit 20 to be retrofitted to an existing mortar mixer 100. Furthermore, in the sensor unit 20 of this embodiment, the controller 10 can be connected between the controller 7 and the power source later. This means that there is no need to remove the controller 7 that is already installed in the mortar mixer 100, and it can be used as is. In addition, the controller 10 can be easily retrofitted.

[0058] In the sensor unit 20, the rod-shaped sensor dog 21 is configured to be inserted into an elongated hole 24d formed in the second bracket 24. As a result, when the cover 3 is opened or closed, the sensor dog 21 and the elongated hole 24d form a fulcrum for opening and closing the cover 3 relative to the stirring tank 1. Therefore, the cover 3 can be easily opened and closed without removing it from the stirring tank 1.

[0059] Furthermore, in the sensor unit 20, the elongated hole 24d is formed to extend in the radial direction of the stirring tank 1. This allows the sensor dog 21 to tilt while being guided by the elongated hole 24d when opening or closing the cover 3. This improves the operability when opening or closing the cover 3.

[0060] Furthermore, in the mortar mixer 100 of this embodiment, an area R2 in which only the annular member 3a is provided is provided on the cover 3, and a movable member 6 is provided that can cover area R2 of the cover 3. As a result, by shifting the movable member 6 from area R2 of the cover 3, the mortar material can be poured into the mixing tank 1 from area R2 of the cover 3 with the cover 3 attached. Furthermore, by covering area R2 of the cover 3 with the movable member 6, it is possible to reliably prevent an operator from inserting their hand into the mixing tank 1 through area R2 of the cover 3. In this way, by providing the movable member 6 on the cover 3, both safety and workability can be achieved.

[0061] Although the embodiments of the present invention have been described above, the above embodiments merely illustrate some of the application examples of the present invention, and it is not intended that the technical scope of the present invention be limited to the specific configurations of the above embodiments.

[0062] For example, the cover 3 does not necessarily need to have the region R2 or the movable member 6.

[0063] In the above embodiment, a normally open induction type proximity switch has been described as an example of the sensor main body 23, but this is not limiting. For example, an optical or magnetic proximity switch may also be used. Furthermore, the sensor main body 23 is not limited to a switch type sensor that switches ON / OFF, but may also be a sensor that outputs a continuous signal.

[0064] Furthermore, the method of fixing the first bracket 22 and the second bracket 24 in the above embodiment is merely an example and is not limited to this. Furthermore, the shape of the cover 3 can also be changed as appropriate. The shape of the cover 3 does not need to be mesh-like, and for example, the annular member 3a in the above embodiment may be omitted. The material of the cover 3 is not limited to metal, and may be any material, such as resin.

[0065] The cross-sectional shape of the sensor dog 21 is not limited to a circle, but may be a rectangle or an ellipse. When the cross-sectional shape of the sensor dog 21 is a rectangle or an ellipse, the sensor dog 21 can be prevented from rotating within the elongated hole 24d. This prevents the cover 3 from rotating due to the sensor dog 21 when opening or closing the cover 3. In contrast, when the cross-sectional shape of the sensor dog 21 is a circle, the sensor dog 21 can rotate within the elongated hole 24d. Therefore, even if the sensor dog 21 hits the wall of the elongated hole 24d when opening or closing the cover 3 and the weight of the cover 3 acts on the sensor dog 21 or the connection portion between the sensor dog 21 and the holder 22b, the sensor dog 21 can rotate, thereby dissipating the load acting on these. This prevents damage and deformation of the sensor dog 21 and the connection portion between the sensor dog 21 and the holder 22b, compared to when the cross-sectional shape of the sensor dog 21 is a rectangle or an ellipse. [Explanation of symbols]

[0066] 100···Mortar Mixer 1... Stirring tank 2. Mixing blade 3. Cover 4...Support stand 5. Motor 6. Movable parts 7. Controller (first control section) 10. Controller (second control unit) 20 Sensor unit 21 Sensor dog (detection target) 22 First bracket 22a Main body 22b...Holding part 23 Sensor body (detection part) 24 Second bracket 24a Main body 24b...Holding part 24c···Mounting part 24d...long hole 26···U-bolt

Claims

1. A sensor unit provided in a portable mortar mixer having a mixing tank that contains mortar material, a mixing blade that is provided in the mixing tank and mixes the mortar material, a cover that covers an opening of the mixing tank, and a first control unit that controls the drive of the mixing blade, a detection target that is detachably attached to the cover; a detection unit that is detachably attached to the stirring tank and detects the detection target; a second control unit that controls the driving of the stirring blade based on a signal input from the detection unit, The detection unit is a sensor unit that outputs a signal to the second control unit to stop driving the stirring blade when the detection target is no longer detected.

2. 2. The sensor unit according to claim 1, a bracket for attaching the detection unit to the stirring tank; the detection target is a rod-shaped sensor dog, The sensor dog and the bracket constitute a sensor unit that constitutes a fulcrum for opening and closing the cover relative to the stirring vessel when the cover is opened or closed.

3. 2. The sensor unit according to claim 1, a bracket for attaching the detection unit to the stirring tank; the detection target is a rod-shaped sensor dog, a slot formed in the bracket, the slot extending in a radial direction of the mixing tank and through which the sensor dog is inserted; The long hole guides the sensor dog when the cover is opened or closed.

4. 4. The sensor unit according to claim 2 or 3, The sensor dog is a sensor unit attached to an area opposite to a handle for opening and closing the cover, with the center of the cover in between.

5. A mortar mixer equipped with the sensor unit according to claim 1.

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