JP5861132B2 - Soil disinfector - Google Patents

Description

  The present invention relates to a soil disinfecting machine comprising a chemical solution storage tank, a spray pump that sucks and discharges the chemical solution in the chemical solution storage tank, and a chemical solution spraying unit that sprays the chemical solution fed by the spray pump. The present invention relates to a replenishment configuration for consumed chemicals.

  Conventionally, in a soil disinfector mounted on a traveling vehicle such as a tractor, the chemical solution in the chemical solution storage tank is pumped to a chemical solution injection claw via a chemical solution hose by an intermittent drive spray pump such as a diaphragm pump. And the technique which inject | pours in the soil from the injection nozzle provided in this chemical | medical solution injection | pouring nail | claw, and spreads is known (for example, refer patent document 1). In this technology, a confirmation meter is provided in the middle of the hose so that the flow of the chemical solution can be visually recognized. With this, the presence or absence of the chemical solution supply to the chemical injection nail is always monitored with the naked eye. It is possible to cope with clogging and running out of chemicals in the chemical storage tank.

JP 2010-119359 A

  However, according to the above technique, when the chemical supply is interrupted due to the chemical liquid running out of the chemical liquid storage tank, air mixing has already occurred in the chemical liquid flow path at the time when it can be confirmed by the confirmation meter. There was a problem that the occurrence of dripping from the nozzle and the deterioration of the chemical spraying accuracy were unavoidable. Furthermore, for this air mixing, it is possible to respond by frequently performing monitoring work and air bleeding work with a confirmation meter, but in either case, it is inevitable that the work load increases and the work efficiency decreases, In the air venting operation, wasteful chemicals are sprayed each time the air is vented, so that there is a problem that the occurrence of chemical damage and an increase in chemical cost are unavoidable.

The problem to be solved by the present invention is as described above. Next, means for solving the problem will be described.
In claim 1, in a soil disinfecting machine comprising a chemical solution storage tank, a spray pump for sucking and discharging the chemical solution in the chemical solution storage tank, and a chemical solution spraying unit for spraying the chemical solution pumped by the spray pump A chemical solution replenishment tank that replenishes the spent chemical solution in the chemical solution storage tank, a replenishment pump that sucks and discharges the chemical solution in the chemical solution replenishment tank and pumps it to the chemical solution storage tank, and remains in the chemical solution storage tank. the weight of the chemical solution are (hereinafter referred to as "chemical balance") and a remaining amount detection apparatus for detecting a chemical replenishment mechanism for driving on-off of the replenishing pump provided in accordance with the detected chemical remaining, the The remaining amount detecting device includes an elastic member that expands and contracts in the height direction according to the weight of the chemical liquid storage tank while supporting the chemical liquid storage tank from below, and a switch that switches on and off by changing the expansion and contraction length of the elastic member. A switch for turning on and off the replenishing pump by turning on and off the limit switch. A plurality of the elastic members are provided, and at least one elastic member has an elastic modulus different from that of the other elastic members. Each of the elastic member groups having the limit switch is provided with the limit switch .
According to a second aspect of the present invention, the elastic member includes a first elastic member having a high elastic modulus for setting a first remaining amount reference at a high weight level and a low amount for setting a second remaining amount reference at a low weight level. The second elastic member having a modulus of elasticity and a first reference mode for driving the replenishing pump when the remaining amount of the chemical solution decreases to the first remaining amount reference, and the remaining amount of the chemical solution decreases to the second remaining amount reference Then, a changeover switch capable of selecting one of the second reference modes for driving the replenishing pump is provided.
According to a third aspect of the present invention, the elastic member includes a first elastic member having a high elastic modulus for setting a first remaining amount reference at a high weight level and a low amount for setting a second remaining amount reference at a low weight level. And a second elastic member having an elastic modulus, and driving the replenishment pump when the remaining amount of the chemical solution is reduced to the first remaining amount reference, and further warning means when the remaining amount of the chemical solution is reduced to the second remaining amount reference Is provided.

Since this invention was comprised as mentioned above, there exists an effect shown below.
That is, according to claim 1, the remaining amount of the chemical solution in the chemical solution storage tank is constantly monitored, and when the remaining amount of the chemical solution is reduced to a preset remaining amount of the chemical solution (hereinafter referred to as “remaining amount reference”), The chemical solution storage tank can be replenished before the chemical solution runs out, and this prevents the chemical solution in the chemical solution tank from running out and prevents air from entering the chemical flow path. The generation | occurrence | production suppression and improvement of chemical | medical solution spraying precision can be aimed at. Furthermore, it is not necessary to frequently perform monitoring work and air venting work by visually checking the confirmation meter, and it is possible to reduce work load, improve work efficiency, prevent chemical damage, and reduce chemical cost.
In addition , with a simple configuration consisting only of elastic members such as springs and rubber and limit switches, it is possible to control the replenishment pump drive by detecting the remaining amount of the chemical solution, without using expensive and precise electronic equipment. Cost can be reduced and durability can be improved.
In addition , a plurality of remaining amount standards can be provided by elastic members having different elastic moduli, and the versatility of the soil disinfecting machine can be increased to meet various needs.
According to the second aspect of the present invention, since the remaining amount of the chemical solution is in the first remaining amount standard, even if the chemical solution storage tank is heavy and the inertia force is large, the upper and lower portions of the chemical solution storage tank are The moving width is reduced, hunting of the limit switch can be prevented, and the detection accuracy of the remaining amount detection device is improved. In particular, even when the unevenness of the field is large and the liquid level moves up and down violently, it is set to the first remaining amount reference only by changing from the second reference mode to the first reference mode. Therefore, as described above, the vertical movement width of the chemical solution storage tank is reduced to suppress the fluctuation of the liquid level, and the remaining amount of the chemical solution in the chemical solution storage tank is increased to make the suction port of the chemical solution suction hose deeper. It is possible to prevent the air from being mixed into the chemical liquid more reliably. In addition, even when the specific gravity of the chemical solution is significantly different from normal, it is possible to accurately detect the volume of the chemical solution remaining in the chemical solution storage tank and effectively prevent the chemical solution from running out in the chemical solution storage tank. it can. For example, when the specific gravity of the chemical solution is large, by selecting the first reference mode and increasing the weight level at the start of replenishment, the chemical solution can be replenished before the volume of the chemical solution is greatly reduced to prevent the chemical solution from running out. it can.
According to the third aspect of the present invention, since the remaining amount of the chemical solution is in the first remaining amount standard, the upper and lower portions of the chemical solution storage tank are The moving width is reduced, hunting of the limit switch can be prevented, and the detection accuracy of the remaining amount detection device is improved. In particular, the alarm means detects that the remaining amount of the chemical solution in the chemical solution storage tank has decreased even though the chemical solution has been replenished after the remaining amount of the chemical solution has decreased to the first remaining amount reference. Therefore, it is possible to know that the chemical solution replenishment tank has already run out, so that the chemical solution replenishment tank can be replaced with a new one before the chemical solution storage tank has run out. Cutting can be prevented and air mixing into the chemical solution can be reliably prevented.

It is a side perspective view of the state where the multi soil disinfector concerning the present invention was installed in the rear part of the tractor. It is a back perspective view similarly. FIG. 6 is a chemical route diagram by a chemical solution replenishment mechanism 53. 4A is a partial cross-sectional view of a side surface of the refill pump unit, FIG. 4A is a partial cross-sectional view of a side surface of the refill pump 35A, and FIG. 4B is a partial cross-sectional view of a side surface of the refill pump 35B. 7 is a perspective view of a remaining amount detection device 54. FIG. 5 is an electric circuit diagram of a chemical solution replenishing mechanism 53. FIG. It is a chemical | medical solution route map by the chemical | medical solution replenishment mechanism 53A. It is a perspective view of 54 A of residual amount detection apparatuses. It is an electric circuit diagram of the chemical solution replenishment mechanism 53A. It is a chemical | medical solution route diagram by the chemical | medical solution replenishment mechanism 53B. It is an electric circuit diagram of the chemical solution replenishment mechanism 53B. It is a chemical | medical solution route diagram by the chemical | medical solution replenishment mechanism 53C. It is an electric circuit diagram of the chemical solution replenishment mechanism 53C.

  Hereinafter, embodiments of the present invention will be described in detail. In addition, the direction shown by the arrow F of FIG. 1 is made into the advancing direction of the multi soil disinfection machine 1, and the position, direction, etc. of each member described below are based on this advancing direction.

  First, the whole structure of the multi-soil disinfector 1 which is the soil disinfectant concerning this invention is demonstrated with reference to FIG. 1 thru | or FIG. The multi-soil disinfecting machine 1 is pulled by a tractor 2 that is a traveling vehicle, injects a chemical solution 58 into a field, and then stretches a multi-film 3a on the field. A pressure feeding unit 5, a chemical solution injection unit 6, and a multi-work unit 7 are arranged in this order.

  Here, the tractor 2 is provided with a tillage device 8. In the cultivator 8, a cylindrical beam 36 is horizontally mounted on the left and right, a transmission shaft 10 is built in the beam 36, and a transmission case 11 is connected to the left end of the beam 36. A tilling claw shaft 13 having a plurality of tilling claws 12, 12... As a result, the power input from the tractor 2 via an input shaft (not shown) is transmitted to the tilling claws 12, 12... Via the transmission shaft 10, the transmission case 11, and the tilling claw shaft 13. 12.12 ... rotates and the field is plowed. The connecting portion 4 is connected to the left and right middle portions of the beam 36.

  The connecting portion 4 includes a pair of left and right side bars 14 and 14 that are connected to the beam 36 so as to be rotatable up and down, a front frame 15 that connects between the front and rear middle portions of the side bars 14 and 14, A rear frame 16 for connecting the rear ends of the bars 14 and 14 is provided.

  On the other hand, a front end of a V-shaped connecting member 18 fixed to the beam 36 is connected to the top link 19 of the tractor 2, and between the rear end of the connecting member 18 and the front frame 15. In addition, an angle adjusting tool 17 capable of expanding and contracting the entire length is interposed.

  As a result, the connecting portion 4 is moved up and down with respect to the tractor 2 by the top link 9, and the handle 17 a of the angle adjuster 17 is rotated to expand and contract the angle adjuster 17, thereby focusing on the beam 36. The connection part 4 is rotated up and down, and the front-back direction inclination angle of the multi-soil disinfector 1 can be changed to a predetermined angle.

  The chemical solution feeding section 5 includes a pair of left and right support stays 20, 20 extending obliquely upward and forward from the rear frame 16, and a chemical solution first frame fixed to the front end of the support stays 20, 20 and extending left and right. 21, an infusion pump unit 24 disposed on the first medicinal liquid frame 21 via support stays 23, 23, and protruded forward from the first medicinal liquid frame 21 on the left side of the infusible pump unit 24. A replenishment pump unit 25 disposed on the support arm 26 is provided.

  Further, a chemical solution storage tank 29 supported by the left end of the chemical solution first frame 21 via a tank support member 27, and a chemical solution replenishment tank 30 supported by the right end of the chemical solution first frame 21 via a tank support member 28. And a plurality of confirmation meters 33, 33,... Attached to a box-shaped confirmation meter support 32 provided on an upper part of a pole 31 standing upright from the substantially right and left center of the chemical liquid first frame 21. .

  From the chemical solution replenishment tank 30, a set of replenishment pumps 35A and 35B in the replenishment pump unit 25, a chemical solution storage tank 29, four sets of infusion pumps 34A and 34B in the infusion pump unit 24, and confirmation meters 33, 33, ... A hose 9 a or the like through which the chemical liquid 58 flows is interposed over the chemical liquid injection section 6.

  As a result, the chemical liquid 58 in the chemical liquid storage tank 29 is pumped to the chemical liquid injection section 6 by the four sets of injection pumps 34A and 34B, and the chemical liquid storage tank 29 is detected by the remaining amount detection device 54 of the chemical liquid replenishment mechanism 53 described later. When the chemical solution 58 is consumed and falls below a predetermined remaining amount standard, the chemical solution in the chemical solution replenishment tank 30 is transferred to the chemical solution storage tank 29 by a pair of replenishment pumps 35A and 35B. Supplied automatically.

  The chemical solution injection section 6 includes a pair of left and right support stays 38 and 38 extending rearward from the rear frame 16, and a chemical solution second frame 22 fixed to the rear end of the support stays 38 and 38 and extending left and right. A claw support frame 40 extending left and right diagonally below the front of the second chemical liquid frame 22, and an injection depth adjuster for connecting the claw support frame 40 to the second chemical liquid frame 22 so as to be movable up and down. 39 and eight chemical liquid injection claws 41, 41,... For eight strips arranged in a staggered manner in the front-rear direction on the claw support frame 40.

  Further, each of the chemical liquid injection claws 41, 41,... Has a groove forming claw 42 suspended from the claw support frame 40, and upper and lower nozzles 43, 43 fixed to the back surface of the groove forming claw 42. The nozzles 43 and 43 are communicated with the check gauges 33, 33... Via the hoses 9g and 9h, whereby the chemical liquid 58 fed from the chemical liquid feeding section 5 is injected with the chemical liquid. It is made to inject | pour into a farm field from nail | claw 41 * 41 .... The depth of the nozzles 43 and 43 at this time can be adjusted by rotating the handle 39a of the injection depth adjusting tool 39 to move the claw support frame 40 up and down with respect to the second chemical liquid frame 22. It is said.

  The multi-work unit 7 is supported on both left and right ends of the chemical liquid second frame 22, both of which include a front support arm 45 whose front end is connected to the chemical liquid second frame 22 and a rear end of the front support arm 45. A rear support arm 46 that is pivotably moved back and forth and is storably connected, a wheel 48 that is rotatably supported by a lower end of a support member 44 that is suspended from the front end of the front support arm 45, and the wheel 48 And a multi-supporting wheel 3 that rotatably supports the multi-film 3a behind the wheel 48.

  Furthermore, a multi-pressing wheel 49 that is supported by a lower end of a support member 51 that is suspended from the front portion of the rear support arm 46 and that presses the multi-film 3a stretched on the field behind the multi-supporting wheel, and the rear support A cover ring 50 is provided that is supported by a lower end of a support member 52 that is suspended from the rear end of the arm 46 and covers the multi-film 3a that is stretched on the farm field behind the multi-pressing wheel 49.

  As a result, the multi-film 3a is stretched by the multi-supporting wheel 3 in the field into which the chemical solution 58 has been injected as described above, and the left and right ends of the multi-film 3a are pressed by the multi-pressing wheels 49 and 49, Then, the soil is covered on the left and right ends of the multi-film 3a by the cover ring 50, and the multi-operation is completed.

  Next, the chemical solution replenishing mechanism 53 will be described with reference to FIGS. As shown in FIG. 3, the chemical solution replenishment mechanism 53 includes the chemical solution replenishment tank 30, a replenishment pump unit 25, and a remaining amount detection device 54 provided on the lower surface of the chemical solution storage tank 29.

  In the replenishing pump unit 25, as shown in FIGS. 1 to 4, a box-shaped pump bracket 55 is disposed with its longitudinal direction set in the front-rear direction, and the diaphragm-type pump bracket 55 is disposed on the upper surface of the pump bracket 55. Replenishment pumps 35A and 35B are fixed to the front and rear.

  In the replenishing pump 35A, a suction valve 35a and a discharge valve 35b project from the upper part, and a hose 9a having one end immersed in the chemical 58 in the chemical replenishing tank 30 is connected to the suction valve 35a. Connected to the discharge valve 35b is a hose 9b whose one end is immersed in the chemical solution 58 in the chemical solution storage tank 29.

  Further, a diaphragm 35c is provided at the lower part of the replenishing pump 35A. A connecting rod 35d is suspended from the lower center of the diaphragm 35c. A cam follower 56 is connected to the lower end of the connecting rod 35d via a pin 35e. Are rotatably connected. On the other hand, a cam shaft 59 is horizontally mounted on the pump bracket 55 in the front-rear direction, and the front end of the cam shaft 59 is connected to the output shaft of the electric motor Ma. A cam 57 is fixed.

  Similarly, the replenishing pump 35B is also provided with a suction valve 35a and a discharge valve 35b on its upper part, and a hose 9c with one end immersed in the chemical 58 in the chemical replenishing tank 30 is connected to the suction valve 35a. The discharge valve 35b is connected to a hose 9d whose one end joins the hose 9b.

  Further, a diaphragm 35c is similarly provided at the lower portion of the replenishing pump 35B. A connecting rod 35d is suspended from the lower center of the diaphragm 35c, and a cam is provided at the lower end of the connecting rod 35d via a pin 35e. A follower 56 is rotatably connected. On the other hand, a cam shaft 60 provided separately from the cam shaft 59 is rotatably mounted on the pump bracket 55, and the rear end of the cam shaft 60 is connected to the output shaft of the electric motor Mb. A cam 57 is fixed in the middle.

  In such a configuration, when the electric motor Ma is driven, the rotational power is transmitted to the cam 57 via the cam shaft 59, and when the cam 57 rotates, the cam follower 56 that contacts the cam 57 moves up and down. The diaphragm 35c is actuated through the pin 35e and the connecting rod 35d by the vertical movement. Then, due to the pump action, the replenishment pump 35A sucks the chemical liquid 58 in the chemical liquid replenishment tank 30 from the hose 9a via the suction valve 35a, and discharges the chemical liquid 58 from the discharge valve 35b via the hose 9b. The storage tank 29 is replenished.

  Similarly, in the electric motor Mb, the rotational power is transmitted to the cam 57 via the cam shaft 60, and the vertical movement is transmitted to the diaphragm 35c via the cam follower 56, the pin 35e, and the connecting rod 35d. Then, due to the pump action, the replenishing pump 35B also sucks the chemical liquid 58 in the chemical liquid replenishing tank 30 from the hose 9c via the suction valve 35a, and discharges the chemical liquid 58 from the discharge valve 35b via the hose 9d. Refill the storage tank 29.

  That is, the chemical solution 58 in the chemical solution replenishment tank 30 is replenished into the chemical solution storage tank 29 by using two replenishment pumps 35A and 35B that can be independently driven by separate drive sources of the electric motors Ma and Mb. Compared to the case of using one pump, the chemical solution replenishment ability can be improved, and by reducing the amount of chemical solution replenished per refill pump, the load on each refill pump can be reduced and the pump life can be improved. be able to. Each of the discharge side hoses 9b and 9d is provided with a confirmation meter 33 in the middle thereof so that the presence or absence of the discharge of the chemical liquid 58 by the replenishing pumps 35A and 35B can be confirmed.

  And the chemical | medical solution 58 replenished in the chemical | medical solution storage tank 29 by such a replenishment pump unit 25 is supplied to the said infusion pump unit 24, as shown in FIG. 2, FIG.

  Here, the infusion pump unit 24 is composed of four sets of infusion pumps 34A and 34B as described above, and the structure thereof is substantially the same as the replenishment pump unit 25 except for a flow rate adjusting mechanism (not shown). Each set is incorporated into a box-shaped pump bracket 61, and each of the infusion pumps 34A and 34B includes a suction valve 34a, a discharge valve 34b, a diaphragm 34c, a connecting rod 34d, a pin 34e, a cam follower 56, and a cam 57. Is arranged. The cam 57 is fixed to the middle portion of the cam shaft 63 common to the four sets of infusion pumps 34A and 34B, and the right end of the cam shaft 63 is connected to the output shaft of a single electric motor M.

  Further, a hose 9e having one end immersed in the chemical solution 58 in the chemical solution storage tank 29 is connected to the suction valves 34a of the two sets of injection pumps 34A and 34B on the right side, and the discharge valve 34b has four right ends. A hose 9g communicating with the upper and lower nozzles 43, 43 of the chemical injection claw 41 is connected. A hose 9f having one end immersed in the chemical solution 58 in the chemical solution storage tank 29 is connected to the suction valves 34a of the two sets of infusion pumps 34A and 34B on the left side. The discharge valve 34b has four left ends. A hose 9h communicating with the upper and lower nozzles 43, 43 of the chemical liquid injection claw 41 is connected.

  In such a configuration, when the electric motor M is driven, the rotational power is simultaneously transmitted to the eight cams 57 via the cam shaft 63, and the eight diaphragms 35c are operated via the cam follower 56 and the like. Then, by the pumping action, the four sets of infusion pumps 34A and 34B suck the chemical liquid 58 in the chemical liquid storage tank 29 from the hoses 9e and 9f through the suction valve 34a, and the hoses 9g and 9h from the discharge valve 35b. Then, the chemical liquid 58 is supplied to the eight chemical liquid injection claws 41.

  As shown in FIGS. 1 and 2, the remaining amount detecting device 54 is fitted and fixed on the bottom plate portion 27a of the tank support member 27, and the chemical solution storage tank 29 is placed thereon. Yes. The chemical liquid storage tank 29 is wound and fixed around the vertical frame portion 27b of the tank support member 27 by a belt 71, and the chemical liquid storage tank 29 is prevented from moving or overturning due to vibrations during traveling, etc. The accuracy of the remaining amount measurement by the detection device 54 is not lowered.

  As shown in FIGS. 5 and 6, the remaining amount detecting device 54 includes a plate-like mounting base 64, an elastic support 72 and a limit switch 81 mounted on the mounting base 64, and the elastic support. 72. A plate-shaped mounting table 65 provided on the mounting table 64 via a limit switch 81, and the chemical solution storage tank 29 is mounted on the mounting table 65.

  The mounting base 64 includes a flat part 64a and a hanging part 64b suspended from the rear edge of the flat part 64a. The flat part 64a supports the flat part 64a obliquely downward and forward by the hanging part 64b. Is done. Thereby, the chemical solution storage tank 29 placed on the mounting table 65 on the mounting table 64 is tilted forward, and the left and right two of the front side surface of the chemical solution storage tank 29 are erected from the front part of the mounting table 65. The support bars 70 and 70 can be abutted and supported to prevent the chemical storage tank 29 from moving or overturning more reliably.

  The elastic support body 72 is disposed at the four corners of the flat surface portion 64 a, and includes four guide bars 67 erected from the four corners, and four cylindrical shapes that are externally fitted to the base portion of the guide bar 67. It comprises a collar 68 and four spring bodies 69 wound around the guide bar 67 on the upper surface of the collar 68.

  Of the four guide bars 67, the front two are arranged at positions that can be inserted into the long holes 65c and 65c long in the front-rear direction provided at the front portion of the mounting table 65, and the rear two are It arrange | positions in the position which can be inserted in round hole 65d * 65d provided in the rear part of the mounting base 65. FIG. Accordingly, the mounting table 65 is slid along the four guide bars 67 and elastically supported on the mounting table 64 via the spring bodies 69 on the respective collars 68.

  The limit switch 81 is disposed substantially at the center of the flat surface portion 64a, and a switch case 81a fixed to the flat surface portion 64a, and a thin metal piece elastically stretched forward and obliquely upward on the upper surface of the switch case 81a. Detection arm 81b, terminals 81c and 81d that are in an electrically connected state when the detection arm 81b is not depressed, and lead wires 81e and 81f that connect the terminals 81c and 81d to an electric circuit 73 described later, respectively. Consists of.

  When the mounting table 65 descends along the guide bar 67 while resisting the elastic force of the four spring bodies 69 and the detection arm 81b is pushed down by the lower surface of the mounting table 65, the space between the terminals 81c and 81d Is disconnected and the limit switch 81 is in the “off state”. Conversely, when the mounting table 65 is raised and the lower surface of the mounting table 65 is separated from the detection arm 81b, the terminals 81c and 81d are reconnected. Thus, the limit switch 81 is set so as to automatically return to the “ON state”.

  After the limit switch 81 shifts to the “OFF state”, the peripheral portions of the holes 65c, 65c, 65d, and 65d at the four corners of the mounting table 65 are in contact with the upper surface of the collar 68, and the mounting table 65 is more than that. The lower limit is restricted so that the load cannot be lowered, and an overload is prevented from being applied to the limit switch 81 by the mounting table 65 on which the heavy chemical liquid storage tank 29 is placed, thereby improving the life of the apparatus.

  The mounting table 65 includes a flat surface portion 65a and a standing portion 65b that is erected from the rear edge of the flat surface portion 65a. The erected portion 65b regulates the rearward movement of the chemical solution storage tank 29, and is mounted. The fall from the mount 65 is prevented. Further, as described above, support bars 70 and 70 for supporting the chemical solution storage tank 29 are erected at the front portion of the mounting table 65, and the mounting table 65 is mounted on the mounting table 64 at the four corners of the mounting table 65. Are provided with holes 65c, 65c, 65d, and 65d.

  Further, as shown in FIG. 6, the electric circuit 73 of the chemical solution replenishment mechanism 53 includes the electric motor Ma / Mb, a battery 77 for supplying electric power to the electric motor Ma / Mb, and the battery The chemical solution replenishing switch 78 for turning on and off the power from 77, the limit switch 81 for connecting and disconnecting the circuit from the chemical solution replenishing switch 78 to the electric motors Ma and Mb, and these devices are connected to each other. It comprises an electrical wire 86a, a connector 85 for two poles that connects and disconnects the electrical wire 86a and the like, and a connector 85A for two poles and four poles.

  The positive terminal 77a of the battery 77 is connected to the electric motor Ma via an energization path 79a including an electric wire 86a, a chemical solution replenishment switch 78, an electric wire 86b, an electric wire 87a, an electric wire 88a, and a lead wire 89a. The electric motor Ma is connected to the limit switch 81 through an energization path 79b including a lead wire 89b, an electric wire 88c, an electric wire 87c, and a lead wire 81e. The limit switch 81 is connected to the lead wire 81b. The battery 77 is connected to the negative terminal 77b of the battery 77 through an energization path 79c including an electric line 87b, an electric line 87b, and an electric line 86c. Further, the positive terminal 77a of the battery 77 is connected to the electric motor Mb through an energization path 79d including an electric wire 86a, a chemical solution replenishment switch 78, an electric wire 86b, an electric wire 87a, an electric wire 88d, and a lead wire 90a. The electric motor Mb is connected to the limit switch 81 via an energization path 79e including a lead wire 90b, an electric wire 88b, an electric wire 87c, and a lead wire 81e, and the limit switch 81 The battery 79 is connected to the negative terminal 77b of the battery 77 through a path 79c.

  That is, the electric circuit 73 is formed with a motor Ma side closed circuit 109 including three energization paths 79a, 79b, and 79c and a motor Mb side closed circuit 110 including three energization paths 79d, 79e, and 79c. When the switches 78 and 81 in the middle of the circuit are simultaneously turned on, a direct current from the battery 77 flows through the both closed circuits 109 and 110 so that the electric motors Ma and Mb are driven simultaneously. .

  In the configuration as described above, first, the lever 78a of the chemical solution replenishment switch 78 is tilted to the position 92 side to be set to the “OFF state” so that the closed circuits 109 and 110 are not formed. In this state, when the chemical solution storage tank 29 filled with the chemical solution 58 is placed on the mounting table 65 of the remaining amount detecting device 54 fitted to the tank support member 27, the weight of the chemical solution storage tank 29 is increased. The mounting table 65 is lowered while resisting the elastic force of the spring body 69 of the elastic support body 72, the detection arm 81b is pressed, the connection between the terminals 81c and 81d is cut off, and the limit switch 81 is also set to the “OFF state”. Is done. In this case, both switches 78 and 81 are in the “OFF state”, and the electric motors Ma and Mb are not driven, and the chemical solution in the chemical solution replenishing tank 30 is not replenished to the chemical solution storage tank 29.

  Subsequently, the lever 78a of the chemical solution replenishment switch 78 is tilted to the position 91 side to be changed to the “on state”, the electric motor M is driven, and the chemical solution storage tank is driven by the four sets of the infusion pumps 34A and 34B. The chemical liquid 58 in 29 is pumped to the chemical liquid injection section 6. Then, the chemical solution 58 is injected into the field from the chemical solution injection claws 41, 41... And the chemical solution 58 in the chemical solution storage tank 29 is consumed, and the remaining amount of the chemical solution gradually decreases.

  As the remaining amount of the chemical solution decreases, the mounting table 65 on which the chemical solution storage tank 29 is placed becomes lighter, and the mounting table 65 is pushed up by the elastic force of the spring body 69. And when the chemical | medical solution 58 reduces to predetermined | prescribed remaining amount reference | standard, the mounting base 65 will leave | separate from the detection arm 81b, the terminal 81c * 81d will be reconnected, and the limit switch 81 will be set to an "on state". Both switches 78 and 81 are simultaneously in the “on state”, and the electric motors Ma and Mb are simultaneously driven to replenish the chemical solution 58 in the chemical solution replenishment tank 30 into the chemical solution storage tank 29.

  When the remaining amount of the chemical solution increases and exceeds the above-mentioned remaining amount reference, the mounting table 65 on which the chemical solution storage tank 29 is placed descends while resisting the elastic force of the spring body 69, and the detection arm 81b is pressed down to thereby connect the terminal 81c. The connection between 81d is cut off again, the limit switch 81 returns from the “on state” to the “off state”, the drive of the electric motors Ma and Mb is stopped, and the chemical liquid replenishment tank 30 is stopped. The By such turning on / off of the limit switch 81, the remaining amount of the chemical solution in the chemical solution storage tank 29 can be automatically set to an appropriate remaining amount reference.

  That is, the chemical solution storage tank 29, the injection pumps 34A and 34B which are spray pumps for sucking and discharging the chemical solution in the chemical solution storage tank 29, and the chemical solution distribution for spraying the chemical solution 58 pumped by the injection pumps 34A and 34B In the multi-soil disinfecting machine 1 which is a soil disinfecting machine having a chemical solution injection unit 6 as a unit, a chemical solution replenishing tank 30 for replenishing the chemical solution 58 consumed in the chemical solution storage tank 29, and the chemical solution replenishing tank 30 Replenishment pumps 35A and 35B for sucking and discharging the chemical liquid 58 and pumping the chemical liquid 58 to the chemical liquid storage tank 29, and a remaining amount detecting device 54 for detecting the chemical liquid residual amount in the chemical liquid storage tank 29 are provided. Accordingly, the chemical solution replenishing mechanism 53 for turning on and off the replenishing pumps 35A and 35B is provided, so that the remaining amount of the chemical solution in the chemical solution storage tank 29 is constantly monitored, and the chemical solution When the amount decreases to the remaining amount standard, the replenishment pumps 35A and 35B are driven, and the chemical solution 58 can be replenished to the chemical solution storage tank 29 before the chemical solution runs out. Therefore, it is possible to prevent air from entering the chemical liquid flow path, to suppress the occurrence of dripping and to improve the accuracy of chemical liquid spraying. Furthermore, it is not necessary to frequently perform monitoring work and air venting work by visually checking the confirmation meter 33, and it is possible to reduce the work load, improve work efficiency, prevent chemical damage, and reduce the chemical cost.

  Further, the remaining amount detecting device 54 includes a spring body 69 that is an elastic member that extends and contracts in the height direction according to the weight of the chemical liquid storage tank 29 while supporting the chemical liquid storage tank 29 from below, and the spring body 69. A limit switch 81 for turning on and off the switch according to a change in expansion / contraction length, and turning on and off the limit switch 81 to turn on and off the replenishing pumps 35A and 35B. With a simple configuration with only the limit switch 81, it is possible to detect the remaining amount of the chemical solution and control the drive of the replenishing pumps 35A and 35B, without using expensive and precise electronic equipment, reducing component costs and durability Can be improved.

  Next, another embodiment of the chemical solution replenishment mechanism 53 as described above will be described below with reference to FIGS. In addition, about the components and structure similar to the said chemical | medical solution replenishment mechanism 53, while using the same code | symbol, detailed description is abbreviate | omitted.

  The chemical solution replenishing mechanism 53A shown in FIGS. 7 to 9 replaces a part of the four spring bodies 69 with spring bodies having different elastic moduli in the chemical liquid replenishing mechanism 53, and is dedicated for each elastic body of each elastic modulus. By providing this limit switch, the detection accuracy of the remaining amount of the chemical solution in the chemical solution storage tank 29 is improved.

  In the chemical solution replenishing mechanism 53A, the mounting table 64 and the mounting table 65 have substantially the same structure as the chemical solution replenishing mechanism 53, but only the front two of the elastic supports are less elastic than the spring body 69. The elastic support members 93 and 93 having a spring body 94 of a ratio are changed. Further, with respect to the limit switch, the limit switch 81 is disposed between the rear two elastic supports 72 and 72, and a new limit is provided between the front two elastic supports 93 and 93. A switch 82 is arranged. As with the limit switch 81, the limit switch 82 also includes a switch case 82a, a detection arm 82b, terminals 82c and 82d, and lead wires 82e and 82f.

  As shown in FIG. 9, the electric circuit 74 of the chemical solution replenishing mechanism 53A includes an electric motor Ma / Mb, a battery 77, a chemical solution replenishing switch 78, a limit switch 81, and an electric circuit 73 of the chemical solution replenishing mechanism 53. In addition to the electric wire 86a and the like and the connectors 85 and 85A, a limit switch 82 and a changeover switch 95 that can select either one of the limit switches 81 or 82 are newly provided.

  Then, when the lever 95a of the changeover switch 95 is tilted to the position 98 side to select the “first reference mode” and connected to the limit switch 81, the energization paths 79a and 79b remain unchanged, and the limit switch 81 is The changeover switch 95 is connected to the changeover switch 95 through an energization path 79f composed of a lead wire 81f and an electric wire 96, and the changeover switch 95 is connected to the battery 77 through an energization path 79g composed of an electric wire 87b and an electric line 86c. Is connected to the negative electrode terminal 77b.

  On the other hand, when the lever 95a of the changeover switch 95 is tilted to the position 99 side to select the “second reference mode” and connected to the limit switch 82, the energization path 79d remains unchanged and the electric motor Mb The limit switch 82 is connected to the limit switch 82 via an energization path 79h including a wire 90b, an electric wire 88b, an electric wire 87c, and a lead wire 82e. The limit switch 82 is connected to the energization path 79i including a lead wire 82f and an electric wire 97. Is connected to the change-over switch 95, and the change-over switch 95 is connected to the negative terminal 77b of the battery 77 via the energization path 79g.

  That is, when the “first reference mode” is selected, the first reference side closed circuit 102 including the four energization paths 79a, 79b, 79f, and 79g is formed, and the switches 78 and 81 are simultaneously turned on. ”, A direct current from the battery 77 flows in the closed circuit 102, and the electric motors Ma and Mb are driven simultaneously. When the “second reference mode” is selected, the second reference side closed circuit 103 including the four energization paths 79d, 79h, 79i, and 79g is formed, and the switches 78 and 82 are simultaneously turned on. ”, A direct current from the battery 77 flows in the closed circuit 103 so that the electric motors Ma and Mb are driven simultaneously.

  In the above-described configuration, when the chemical solution storage tank 29 filled with the chemical solution 58 is placed on the mounting table 65 after the chemical solution replenishment switch 78 is set to the “OFF state”, the high elastic modulus on the rear side is set. The mounting table 65 descends while resisting the elastic force of the spring bodies 69 and 69 and the low elastic modulus spring bodies 94 and 94 on the front side, and the two detection arms 81b and 82b are pushed down to be between the terminals 81c and 81d. The connection between the terminals 82c and 82d is cut off, and the limit switches 81 and 82 are also set to the “OFF state”.

  Subsequently, when the electric motor M is driven after changing the chemical solution replenishment switch 78 to the “on state”, the chemical solution 58 is injected into the field by the four sets of the injection pumps 34A and 34B, and the chemical solution storage tank 29 The remaining amount of chemicals will decrease. Along with this, the mounting table 65 on which the chemical solution storage tank 29 is placed becomes lighter, and the high elastic spring bodies 69 and 69 first push up the rear portion of the mounting table 65 to expand, and a remaining amount of the chemical solution (hereinafter, referred to as “remaining chemical solution remaining amount”). When it is reduced to “the first remaining amount reference”), the rear portion of the loaded mounting table 65 is separated from the detection arm 81b, and the limit switch 81 is set to the “ON state”. At this time, even if the chemical liquid storage tank 29 moves up and down violently, the up and down movement is attenuated by the spring bodies 69 and 69 and the up and down movement width is reduced.

  Thereafter, when the remaining amount of the chemical solution in the chemical solution storage tank 29 further decreases, the low elastic modulus spring bodies 94 and 94 also extend by pushing up the front part of the mounting table 65, When it is reduced to “second remaining amount standard”), the pushed front portion of the mounting table 65 is separated from the detection arm 82b and the limit switch 82 is set to the “ON state”.

  Therefore, when the “first reference mode” is selected with the changeover switch 95, the chemical replenishment switch 78 and the limit switch 81 become “on” when the first remaining amount reference is reduced, and the electric motors Ma and Mb are turned on. Are driven simultaneously. On the other hand, when the “second reference mode” is selected with the changeover switch 95, the chemical replenishment switch 78 and the limit switch 82 become “ON” when the second remaining amount reference is reduced, and the electric motor Ma · Mb is driven simultaneously. That is, the remaining amount reference for starting the replenishment of the chemical solution to the chemical solution storage tank 29 can be set to the first remaining amount reference and the second remaining amount reference only by selecting the limit switch 81 or the limit switch 82 to be used by the changeover switch 95. It can be changed freely. In particular, when the “first reference mode” is selected and set to the first remaining amount reference, the vertical movement width of the chemical solution storage tank 29 is reduced, and a large amount of the chemical solution 58 is left in the chemical solution storage tank 29. I can keep it. In addition, even if the specific gravity of the chemical solution 58 is large and it is mistakenly detected that a sufficient amount remains in reality when only a small amount remains, the weight level at the start of replenishment by selecting the “first reference mode” Can be prevented from running out.

  That is, the spring bodies 69 and 69 and the spring bodies 94 and 94 are provided as a plurality of elastic members, and the spring bodies 94 and 94 have an elastic modulus different from that of the spring bodies 69 and 69. That is, at least one spring body has an elastic modulus different from that of the other spring bodies, and the spring bodies 69 and 69, which are a group of spring bodies having a high elastic modulus, are provided with limit switches 81 and have a low elastic modulus. Since the spring bodies 94 and 94, which are groups, are provided with the limit switch 82, the first remaining amount standard and the second remaining amount reference that are a plurality of remaining amount standards are determined by the spring body 94 and the spring body 69 having different elastic moduli. The multi-soil disinfecting machine 1 that is a soil disinfecting machine can be widely used and can meet various needs.

  Further, as in the present embodiment, the spring body includes a spring body 69 that is a first elastic member having a high elastic modulus for setting a first remaining amount reference at a high weight level, and a second remaining amount at a low weight level. A first reference that drives the replenishment pumps 35A and 35B when the remaining amount of the chemical solution is reduced to the first remaining amount reference is configured with the spring body 94 that is a second elastic member having a low elastic modulus for setting the reference. Since there is provided a changeover switch 95 which can select either the mode or the second reference mode for driving the replenishment pumps 35A and 35B when the remaining amount of the chemical solution is reduced to the second remaining amount reference, Even if the chemical storage tank 29 is heavy and the inertial force is large because of the amount reference, the vertical movement width of the chemical storage tank 29 is reduced by the high elastic modulus spring body 69 and the limit switch 81 is hunted. Prevent It can be improved detection accuracy of the remaining-amount detecting device 54A. In particular, even if the unevenness of the field is large and the liquid level 58a moves up and down violently, it is set to the first remaining amount reference only by changing from the second reference mode to the first reference mode, Accordingly, as described above, the vertical movement width of the chemical solution storage tank 29 is reduced to suppress the swing of the liquid level 58a, and the remaining amount of the chemical solution in the chemical solution storage tank 29 is increased to increase the chemical solution suction hoses 9e and 9f. Can be disposed deeper in the liquid surface 58a, and air mixing into the chemical liquid 58 can be prevented more reliably. In addition, even when the specific gravity of the chemical liquid 58 is greatly different from that of the normal, the volume of the chemical liquid 58 remaining in the chemical liquid storage tank 29 is detected with high accuracy, and the chemical liquid in the chemical liquid storage tank 29 is effectively cut out. Can be prevented. For example, when the specific gravity of the chemical solution 58 is large, the first reference mode is selected and the weight level at the start of replenishment is increased, so that the chemical solution 58 is replenished before the volume of the chemical solution 58 is greatly reduced, so Can be prevented.

  Further, the chemical solution replenishment mechanism 53B shown in FIG. 10 and FIG. 11 is configured to replace the replenishment pump unit 25 in the chemical solution replenishment mechanism 53A with the replenishment pump unit 25A, and to provide an alarm device B operated by the limit switch 82. It is provided that the operation of the alarm device B and the driving of the electric motor Ma can be performed simultaneously, thereby preventing the chemical solution storage tank 29 from running out of the chemical solution.

  In the chemical solution replenishing mechanism 53B, as shown in FIG. 10, the remaining amount detecting device has the same structure as the remaining amount detecting device 54A shown in FIG. 8, but the replenishing pump unit 25A has a replenishing pump 35B and its cam follower. 56, the cam 57, the electric motor Mb, and the like are omitted, and an alarm device B is provided instead.

  Further, as shown in FIG. 11, the electric circuit 75 of the chemical solution replenishing mechanism 53B includes an electric motor Ma, its limit switch 81, an alarm device B, its limit switch 82, a battery 77, a chemical solution replenishing switch 78, an electric wire. 86a and the like, and a connector 85A for two poles and a connector 85A for two poles and four poles.

  The positive terminal 77a of the battery 77 is connected to the electric motor Ma via the energization path 79a, and the electric motor Ma is connected via an energization path 79j composed of a lead wire 89b, an electric wire 88e, and a lead wire 81e. The limit switch 81 is connected to the negative terminal 77b of the battery 77 through an energization path 79k including a lead wire 81f, an electric wire 88b, an electric wire 87d, and an electric wire 86c. Has been.

  On the other hand, the positive terminal 77a of the battery 77 is connected to the alarm device B through an energization path 79l including an electric wire 86a, a chemical solution replenishment switch 78, an electric wire 86b, an electric wire 87e, an electric wire 100a, and a lead wire 101a. The alarm device B is connected to the limit switch 82 via an energization path 79m including a lead wire 101b, an electric wire 100c, and a lead wire 82e. The limit switch 82 includes a lead wire 82f, an electric wire, and the like. The battery 77 is connected to the negative terminal 77b of the battery 77 through an energization path 79n including the electric wire 100b, the electric wire 87b, and the electric wire 86c.

  That is, in the electric circuit 75, a motor Ma side closed circuit 104 including three energization paths 79a, 79j, and 79k and an alarm side closing circuit 105 including three energization paths 79l, 79m, and 79n are arranged in parallel. When the switches 78 and 81 in the middle of the circuit are simultaneously turned on, a direct current from the battery 77 flows in the motor Ma side closed circuit 104 to drive the electric motor Ma. When the switches 78 and 82 are simultaneously turned on, a direct current from the battery 77 flows in the alarm side closed circuit 105 so that the alarm B is activated.

  In the above-described configuration, when the chemical solution storage tank 29 filled with the chemical solution 58 is placed on the mounting table 65 after the chemical solution replenishment switch 78 is set to the “OFF state”, the high elastic modulus on the rear side is set. The mounting table 65 descends while resisting the elastic force of the spring bodies 69 and 69 and the low elastic modulus spring bodies 94 and 94 on the front side, and the two detection arms 81b and 82b are pushed down to be between the terminals 81c and 81d. The connection between the terminals 82c and 82d is cut off, and the limit switches 81 and 82 are also set to the “OFF state”.

  Subsequently, when the electric motor M is driven after changing the chemical solution replenishment switch 78 to the “on state”, the chemical solution 58 is injected into the field by the four sets of the injection pumps 34A and 34B, and the chemical solution storage tank 29 The remaining amount of chemicals will decrease. Along with this, the mounting table 65 on which the chemical solution storage tank 29 is placed becomes lighter, and the high elastic spring bodies 69 and 69 first push up the rear portion of the mounting table 65 to expand and decrease to the first remaining amount reference. Then, the rear part of the loaded mounting table 65 is separated from the detection arm 81b, and the limit switch 81 is set to the “ON” state.

  Then, the chemical solution replenishment switch 78 and the limit switch 81 are simultaneously turned “on”, and the electric motor Ma is driven, and the chemical solution replenishment from the chemical solution replenishment tank 30 to the chemical solution storage tank 29 is started. When the chemical solution is replenished, the chemical solution 58 in the chemical solution replenishment tank 30 decreases, and when the chemical solution runs out and becomes empty, the chemical solution 58 in the chemical solution storage tank 29 that is no longer replenished with the chemical solution 58 also decreases. When the remaining amount of the chemical solution in the chemical solution storage tank 29 is reduced to the second remaining amount reference, the chemical solution replenishment switch 78 and the limit switch 82 are simultaneously turned “on”, and the alarm device B is activated. An alarm signal such as sound or light from B informs that the chemical solution replenishment tank 30 has already run out of the chemical solution.

  That is, the elastic member includes a spring body 69 that is a first elastic member having a high elastic modulus for setting a first remaining amount reference at a high weight level, and a second remaining amount reference at a low weight level. It comprises a spring body 94 which is a low elastic modulus second elastic member, and when the remaining amount of the chemical solution is reduced to the first remaining amount reference, the replenishment pump 35A is driven, and the remaining amount of the chemical solution is further reduced to the second remaining amount. Since a circuit configuration is provided to activate the alarm device B which is an alarm means when the amount is reduced to the reference amount, the remaining amount of the chemical solution is in the first remaining amount reference, so that the chemical solution storage tank 29 becomes heavy and the inertial force is large. In addition, the spring body 69 having a high elastic modulus reduces the vertical movement width of the chemical liquid storage tank 29, prevents hunting of the limit switch 81, and improves the detection accuracy of the remaining amount detection device 54A. In particular, the alarm device indicates that the remaining amount of the chemical solution in the chemical solution storage tank 29 has decreased even though the chemical solution 58 is continuously replenished after the remaining amount of the chemical solution has decreased to the first remaining amount reference. Detected by B, it is possible to know that the chemical solution replenishment tank 30 has already run out of chemical solution, so that the chemical solution replenishment tank 30 can be replaced with a new one before the chemical solution storage tank 29 runs out of chemical solution. Further, it is possible to prevent the chemical solution storage tank 29 from running out of the chemical solution and to reliably prevent air from entering the chemical solution 58.

  Further, the chemical solution replenishing mechanism 53C shown in FIGS. 12 and 13 is provided with two sets of the chemical solution storage tank 29 and the chemical solution replenishing tank 30 in the chemical solution replenishing mechanism 53, and a replenishment path is provided for each set. The amount of the chemical solution 58 supplied from the replenishment path is reduced.

  In the chemical solution replenishment mechanism 53C, as shown in FIG. 12, the remaining amount detection device has the same structure as the remaining amount detection device 54 shown in FIG. 3, but the replenishment pump unit 25B has a chemical solution storage tank 29a and a chemical solution replenishment. A replenishment path 107 having a replenishment pump 35A interposed between the tank 30a and a replenishment path 108 having a replenishment pump 35B interposed between the chemical liquid storage tank 29b and the chemical liquid replenishment tank 30b is provided. Further, right infusion pumps 34A, 34B, 34C driven by an electric motor M1 are connected to the chemical liquid storage tank 29a, and left infusion pumps 34A, 34B driven by an electric motor M2 are connected to the chemical liquid storage tank 29b. -34C is connected.

  In such a configuration, when the electric motor Ma is driven, the chemical liquid 58 in the chemical liquid replenishment tank 30a is drawn from the hose 80a through the suction valve 35a and discharged from the discharge valve 35b through the hose 80b when the electric motor Ma is driven. The chemical solution 58 is replenished in the chemical solution storage tank 29a. Then, when the electric motor M1 is driven, the right side infusion pumps 34A, 34B, and 34C suck the chemical solution 58 in the chemical solution storage tank 29a from the hose 80c through the suction valve 34a, and from the discharge valve 34b through the hose 80g. Then, the chemical liquid 58 is supplied to the right three chemical liquid injection claws 41.

  Similarly, when the electric motor Mb is driven, the chemical liquid 58 in the chemical liquid replenishment tank 30b is drawn from the hose 80d through the suction valve 35a by the replenishment pump 35B, and is discharged from the discharge valve 35b through the hose 80e. Is replenished in the chemical storage tank 29b. Then, when the electric motor M2 is driven, the left side infusion pumps 34A, 34B, and 34C suck the chemical solution 58 in the chemical solution storage tank 29b from the hose 80f through the suction valve 34a, and from the discharge valve 34b through the hose 80h. Then, the chemical liquid 58 is supplied to the left three chemical liquid injection claws 41.

  Further, as shown in FIG. 13, the electric circuit 76 of the chemical solution replenishing mechanism 53C includes an electric motor Ma, its limit switch 81, an electric motor Mb, its limit switch 81, a battery 77, a chemical solution replenishing switch 78, and an electric wire. 86a and the like, and a connector 85A for two poles and a connector 85A for two poles and four poles.

  The positive terminal 77a of the battery 77 is connected to the electric motor Ma via the energization path 79a, and the electric motor Ma is connected to the limit switch 81 via the energization path 79j. The battery 77 is connected to the negative terminal 77b of the battery 77 through the energization path 79k.

  On the other hand, the positive terminal 77a of the battery 77 is connected to the electric motor Mb through an energization path 79p including an electric wire 86a, a chemical solution replenishment switch 78, an electric wire 86b, an electric wire 87e, an electric wire 100a, and a lead wire 90a. The electric motor Mb is connected to the limit switch 81 via an energization path 79q including a lead wire 90b, an electric wire 100c, and a lead wire 81e. The limit switch 81 includes a lead wire 81f, an electric wire The battery 77 is connected to the negative terminal 77b of the battery 77 through an energization path 79r including the electric wire 100b, the electric wire 87b, and the electric wire 86c.

  That is, in the electric circuit 76, the motor Ma side closed circuit 104 including the three energization paths 79a, 79j, and 79k and the motor Mb side closed circuit 106 including the three energization paths 79p, 79q, and 79r are arranged in parallel. When the chemical solution replenishment switch 78 and the limit switch 81 of the motor Ma side closed circuit 104 are simultaneously turned on, a direct current from the battery 77 flows in the motor Ma side closed circuit 104, and the electric motor Ma is driven. Similarly, when the chemical solution replenishment switch 78 and the limit switch 81 of the motor Mb side closed circuit 106 are simultaneously turned on, a direct current from the battery 77 flows through the motor Mb side closed circuit 106, and the electric motor Mb is driven. I try to do it.

  In the above configuration, when the chemical solution replenishment switch 78 is set to the “OFF state” and then the chemical solution storage tank 29a filled with the chemical solution 58 is placed on the mounting table 65, the four spring bodies are provided. The mounting table 65 is lowered while resisting the elastic force of 69, the detection arm 81b is pushed down, the connection between the terminals 81c and 81d is cut off, and the limit switch 81 is set to the “OFF state”. When the chemical solution storage tank 29b filled with the chemical solution 58 is placed on another mounting table 65, the limit switch 81 is similarly set to the “OFF state”.

  Subsequently, after the chemical solution replenishing switch 78 is changed to the “on state” and the electric motor M1 is driven, the chemical solution 58 is injected into the field by the right injection pumps 34A, 34B, and 34C, and the chemical solution storage tank 29a is filled. The remaining amount of chemicals will decrease. Along with this, each mounting table 65 on which the chemical solution storage tank 29a is placed becomes lighter, and the four spring bodies 69 push up the mounting table 65 to expand and further decrease to a predetermined remaining amount standard. Is separated from the detection arm 81b, and the limit switch 81 is set to the “ON state”. Similarly, when the electric motor M2 is driven and the remaining amount of the chemical liquid in the chemical liquid storage tank 29b on the other mounting table 65 is reduced to a predetermined remaining level reference, the mounting table 65 is separated from the detection arm 81b and the limit is reached. The switch 81 is set to “ON”.

  Then, the chemical solution replenishment switch 78 and the limit switch 81 of the both closed circuits 104 and 106 are simultaneously turned on, and the electric motors Ma and Mb are simultaneously driven, and the chemical solution from the chemical solution replenishment tank 30a to the chemical solution storage tank 29a. The replenishment and the chemical solution replenishment from the chemical solution replenishment tank 30b to the chemical solution storage tank 29b are started.

  That is, since the chemical solution replenishing mechanism 53C includes a plurality of replenishment paths 107 and 108 that can independently replenish the chemical liquid 58, the amount of the chemical liquid 58 supplied from a single replenishment path is reduced, and the chemical liquid replenishment tanks 30a and 30b are provided. It is possible to improve the work efficiency by reducing the replacement frequency, and to reduce the burden on the replenishing pumps 35A and 35B, thereby improving the life of the parts.

  The present invention provides all soil disinfecting machines comprising a chemical solution storage tank, a spray pump for sucking and discharging the chemical solution in the chemical solution storage tank, and a chemical solution spraying unit for spraying the chemical solution pumped by the spray pump. Can be applied to.

1 Multi soil disinfection machine (soil disinfection machine)
6 Chemical solution injection part (chemical solution spraying part)
29 / 29a / 29b Chemical liquid storage tank 30 / 30a / 30b Chemical liquid replenishment tank 34A / 34B / 34C Infusion pump (spraying pump)
35A / 35B Replenishment pump 53 / 53A / 53B / 53C Chemical liquid replenishment mechanism 54 / 54A Remaining amount detection device 58 Chemical liquid 69 Spring body (first elastic member with high elastic modulus)
81/82 limit switch 94 Spring body (second elastic member with low elastic modulus)
95 selector switch B Alarm (alarm means)

Claims (3)

In a soil disinfecting machine equipped with a chemical solution storage tank, a spray pump that sucks and discharges the chemical solution in the chemical solution storage tank, and a chemical solution spraying unit that sprays the chemical solution pumped by the spray pump,
A chemical solution replenishment tank that replenishes the chemical solution storage tank into the chemical solution storage tank, a replenishment pump that sucks and discharges the chemical solution in the chemical solution replenishment tank and pumps it to the chemical solution storage tank, and a remaining amount of the chemical solution in the chemical solution storage tank And a remaining amount detecting device for detecting
A chemical replenishment mechanism for turning on and off the replenishing pump according to the detected chemical remaining amount is provided,
The remaining amount detection device switches on and off by an elastic member that expands and contracts in the height direction according to the weight of the chemical liquid storage tank while supporting the chemical liquid storage tank from below, and changes in the expansion and contraction length of the elastic member A limit switch, and turning on and off the limit switch to turn on and off the replenishment pump.
A soil disinfecting machine, wherein a plurality of the elastic members are provided, and at least one elastic member has an elastic modulus different from that of the other elastic members and includes the limit switch for each elastic member group having each elastic modulus . The elastic member includes a first elastic member having a high elastic modulus for setting a first remaining amount reference at a high weight level and a second elastic member having a low elastic modulus for setting a second remaining amount reference at a low weight level. And a first reference mode for driving the replenishment pump when the remaining amount of the chemical solution decreases to the first remaining amount reference, and the refill pump when the remaining amount of the chemical solution decreases to the second remaining amount reference. The soil disinfector according to claim 1, further comprising a changeover switch capable of selecting one of the second reference modes to be driven . The elastic member includes a first elastic member having a high elastic modulus for setting a first remaining amount reference at a high weight level and a second elastic member having a low elastic modulus for setting a second remaining amount reference at a low weight level. And a circuit configuration for driving the replenishing pump when the remaining amount of the chemical solution is reduced to the first remaining amount reference, and further operating the alarm means when the remaining amount of the chemical solution is reduced to the second remaining amount reference. soil disinfection machine according to claim 1, characterized in that provision.

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