A carousel and spindle operating mode switching control circuit and switching control method

Abstract

The application discloses a carousel and rotating shaft working mode switching control circuit and switching control method, which is characterized in that after the carousel and the rotating shaft are controlled to be in a mechanical zero position, a brake holding control circuit and a carousel rotating shaft signal switching circuit are used to make a multi-component injection molding machine enter a carousel working mode or a rotating shaft working mode based on the opening and closing states of a mode selection switch; when the mode selection switch is in an open state, the brake holding control circuit is used to control a rotating shaft servo motor brake to be in a power-on state, and the carousel rotating shaft signal switching circuit is used to control a carousel 0-degree detection electric eye and a carousel 180-degree detection electric eye in the signal switching module to be in an output state; when the mode selection switch is in a closed state, the brake holding control circuit is used to control a power module to stop outputting power to the rotating shaft servo motor brake, and the carousel rotating shaft signal switching circuit is used to control a rotating shaft servo motor driver to be in an output state, thereby realizing smooth switching of the carousel and the rotating shaft in two different working modes.

Description

Technical Field

[0001] This invention relates to the field of multi-component injection molding machines, and more particularly to a control circuit and method for switching working modes of a turntable and a shaft. Background Technology

[0002] Existing injection molding machines generally include rotary injection molding machines and spindle injection molding machines. Rotary injection molding machines primarily use a rotary platen with one or two molds mounted on it. The rotation of the platen drives the molds, changing the mold cavity. Combined with two injection units, this completes the injection molding of two-color products, mainly used to produce two-color products with distinct color boundaries. Spindle injection molding machines, on the other hand, use an auxiliary platen on a moving platen, and then mount a two-cavity mold on the auxiliary platen. A transmission device drives the spindle to rotate, thus rotating the mold core and changing the mold cavity. Combined with two injection units, this completes two-color injection molding. In products produced by this type of injection molding machine, one material penetrates and covers the surface of another material. However, both types of two-color injection molding machines can only mold specific two-color products. It is impossible to use a single two-color injection molding machine to produce products manufactured by both rotary and spindle injection molding machines. Therefore, rotary and spindle-type injection molding machines have emerged. In order to accommodate the different application requirements of both the turntable and the spindle in a rotary injection molding machine, and to achieve smooth switching between the two working modes, this invention proposes a turntable and spindle working mode switching control circuit and switching control method. Summary of the Invention

[0003] To accommodate the different application requirements of both rotary table and rotary shaft injection molding modes and achieve smooth switching between these modes, this invention proposes a rotary table and rotary shaft working mode switching control circuit, applicable to multi-component injection molding machines that share both rotary table and rotary shaft. The switching control circuit includes:

[0004] Mode selection switch Q130;

[0005] Power module;

[0006] Shaft servo motor driver;

[0007] A brake control circuit includes: a first relay module connected to a mode selection switch Q130 and its corresponding contact module; a shaft servo motor brake connected to a power supply module via the contact module; the shaft servo motor brake is also connected to a shaft servo motor driver; the brake control circuit controls the energization state of the first relay module by the open / closed state of the mode selection switch Q130, thereby controlling the open / closed state of the contact module, and controls the on / off state of the power supply module output to the shaft servo motor brake based on the open / closed state of the contact module, so as to realize the braking control of the shaft servo motor brake;

[0008] A turntable shaft signal switching circuit includes: a second relay module connected to a mode selection switch Q130, a third relay module connected to a turntable servo motor driver, and a signal switching module. The signal switching module includes relay contact units corresponding to the second and third relay modules, as well as a 0-degree turntable detection photoelectric sensor and a 180-degree turntable detection photoelectric sensor. The second relay module controls the on / off state of the corresponding relay contact unit based on the open / closed state of the mode selection switch Q130, thereby controlling the output state of the 0-degree and 180-degree turntable detection photoelectric sensors. The output signals corresponding to the 0-degree and 180-degree turntable detection photoelectric sensors are respectively a turntable reverse rotation signal and a turntable forward rotation signal. The third relay module controls the on / off state of the corresponding relay contact unit based on the open / closed state of the mode selection switch Q130, and simultaneously controls the output state of the turntable servo motor driver in conjunction with the on / off state of the corresponding relay contact unit of the second relay module. The output of the turntable servo motor driver includes a turntable reverse rotation signal and a turntable forward rotation signal.

[0009] Furthermore, in the brake control circuit:

[0010] The first relay module includes a seventh zero relay K70 and a seventh one relay K71;

[0011] The contact module includes a first normally closed contact (11-12) and a second normally closed contact (21-22) corresponding to the seventh relay K71; wherein:

[0012] One end of the seventh relay K71 is connected to one end of the seventh zero relay K70 and then connected to one end of the mode selection switch Q130; the other end of the seventh zero relay K70 is connected to the other end of the seventh relay K71 and simultaneously connected to one end of the first normally closed contact (11-12) and the first normally open contact (13-14) of the seventh zero relay K70, one end of the second normally closed contact (21-22) of the seventh relay K71, and the negative terminal of the power module; one end of the first normally closed contact (11-12) of the seventh relay K71 is connected to the positive terminal of the power module and simultaneously connected to the other end of the mode selection switch Q130; the positive terminal of the shaft servo motor brake is connected to the other end of the first normally closed contact (11-12) of the seventh relay K71 and then connected to the first BD port of the shaft servo motor driver; the negative terminal of the shaft servo motor brake is connected to the other end of the second normally closed contact (21-22) of the seventh relay K71 and then connected to the second BD port of the shaft servo motor driver.

[0013] The other end of the seventh zero relay K70 corresponding to the first normally closed contact (11-12) is connected to the rotary mode input channel IN6 in the PLC;

[0014] The other end of the seventh zero relay K70 corresponding to the first normally open contact (13-14) is connected to the shaft mode input channel IN5 in the PLC.

[0015] Furthermore, the brake control circuit also includes:

[0016] The first six relay KS16, the seventh zero six switch S706, and the first normally open contact (14-13) and the second normally open contact (24-23) corresponding to the first six relay KS16;

[0017] The first normally open contact (14-13) corresponding to the first sixth relay KS16 is connected in parallel with the first normally closed contact (11-12) corresponding to the seventh relay K71, and one of its parallel terminals is connected to one end of the seventh zero-six switch S706 between the positive terminal of the power module and the other end of the seventh zero-six switch S706. The second normally open contact (24-23) corresponding to the first sixth relay KS16 is connected in parallel with the second normally closed contact (21-22) corresponding to the seventh relay K71. The other end of the first sixth relay KS16 is connected to the negative terminal of the power module.

[0018] Furthermore, in the turntable shaft signal switching circuit:

[0019] The second relay module includes a third zero relay K30;

[0020] The third relay module includes a second fourth relay K24 and a second fifth relay K25;

[0021] The signal switching module includes the first normally open contact (13-14), the first normally closed contact (11-12), the second normally open contact (23-24), and the second normally closed contact (21-22) corresponding to the third zero relay K30; the normally open contact (13-14) corresponding to the second fourth relay K24; the normally open contact (23-24) corresponding to the second fifth relay K25; and a 0-degree detection photoelectric sensor and a 180-degree detection photoelectric sensor for the turntable; wherein:

[0022] One end of the third zero relay K30 is connected to one end of the mode selection switch Q130, and the other end is connected to the negative terminal of the power supply module; the other end of the mode selection switch Q130 is connected to the positive terminal of the power supply module; one end of the third zero relay K30 corresponding to the first normally open contact (13-14) is connected to one end of the third zero relay K30 corresponding to the first normally closed contact (11-12) and then connected to the reverse positioning input channel IN1 in the PLC, and the other end is connected to one end of the second fourth relay K24 corresponding to the normally open contact (13-14); the other end of the third zero relay K30 corresponding to the first normally closed contact (11-12) is connected to the second wiring point of the 0-degree detection photoelectric sensor of the turntable; the first wiring point of the 0-degree detection photoelectric sensor of the turntable is connected to the positive terminal of the power supply module, and the third wiring point is connected to the negative terminal of the power supply module; the other end of the second fourth relay K24 corresponding to the normally open contact (13-14) is connected to the negative terminal of the power supply module; the third zero relay K30 corresponding to the second normally open contact (23-24) One end of the relay is connected to one end of the second normally closed contact (21-22) and then connected to the forward rotation to position input channel IN2 in the PLC; the other end is connected to one end of the normally open contact (23-24) corresponding to the second fifth relay K25; the other end of the third zero relay K30 corresponding to the second normally closed contact (21-22) is connected to the second connection point of the 180-degree detection photoelectric sensor of the turntable; the first connection point of the 180-degree detection photoelectric sensor of the turntable is connected to the positive terminal of the power supply module, and the third connection point is connected to the negative terminal of the power supply module; the other end of the normally open contact (23-24) corresponding to the second fifth relay K25 is connected to the negative terminal of the power supply module; one end of the second fourth relay K24 is connected to one end of the second fifth relay K25, and its connection end is connected to the ground terminal in the shaft servo motor driver; the other end of the second fourth relay K24 is connected to the reverse rotation to position output port D01 in the shaft servo motor driver; the other end of the second fifth relay K25 is connected to the forward rotation to position output port D02 in the shaft servo motor driver;

[0023] The turntable shaft signal switching circuit further includes: a 0-degree shaft detection photoelectric sensor and a 180-degree shaft detection photoelectric sensor that are always in output state; the second connection point of the 0-degree shaft detection photoelectric sensor is connected to the 0-degree shaft detection signal input channel IN3 in the PLC, the first connection point is connected to the positive terminal of the power supply module, and the third connection point is connected to the negative terminal of the power supply module; the second connection point of the 180-degree shaft detection photoelectric sensor is connected to the 180-degree shaft detection signal input channel IN3 in the PLC, the first connection point is connected to the positive terminal of the power supply module, and the third connection point is connected to the negative terminal of the power supply module.

[0024] This invention also proposes a control method for switching working modes of a turntable and a shaft, applicable to a multi-component injection molding machine that includes a control circuit for switching working modes of a turntable and a shaft; the control method includes:

[0025] The control turntable and the rotating shaft are at the mechanical zero-degree position; the mechanical zero-degree position is the position of the turntable and the rotating shaft when the 0-degree detection photoelectric sensor of the turntable and the 0-degree detection photoelectric sensor of the rotating shaft are triggered simultaneously.

[0026] Based on the open / closed state of the mode selection switch Q130, the brake control circuit and the turntable shaft signal switching circuit enable the multi-component injection molding machine to enter either the turntable working mode or the shaft working mode. The open / closed state includes an open state corresponding to the turntable working mode and a closed state corresponding to the shaft working mode. When the mode selection switch Q130 is in the open state, the brake control circuit controls the shaft servo motor brake to be energized, and the turntable shaft signal switching circuit controls the 0-degree and 180-degree detection photoelectric sensors in the signal switching module to be in the output state. When the mode selection switch Q130 is in the closed state, the brake control circuit controls the power module to stop outputting power to the shaft servo motor brake, and the turntable shaft signal switching circuit controls the shaft servo motor driver to be in the output state.

[0027] Furthermore, the brake servo motor brake is energized via the brake holding control circuit, specifically including:

[0028] Disconnect mode selection switch Q130 de-energizes the seventh relay K71. At this time, the first normally closed contact (11-12) and the second normally closed contact (21-22) corresponding to the seventh relay K71 remain closed, thereby connecting the power supply path between the power module and the shaft servo motor brake, and energizing the shaft servo motor brake.

[0029] Furthermore, the turntable shaft signal switching circuit controls the 0-degree and 180-degree detection photoelectric sensors in the signal switching module to be in output mode, specifically including:

[0030] Disconnect mode selection switch Q130 de-energizes the third zero relay K30. At this time, the first normally open contact (13-14) and the second normally open contact (23-24) of the third zero relay K30 remain open, and the first normally closed contact (11-12) and the second normally closed contact (21-22) remain closed. This puts the signal sources for reverse positioning and reverse positioning, namely the 0-degree detection photoelectric sensor and the 180-degree detection photoelectric sensor of the turntable, into the output state. The 0-degree detection photoelectric sensor and the 180-degree detection photoelectric sensor of the turntable output the corresponding signals to the reverse positioning input channel IN1 and the forward positioning input channel IN2, respectively.

[0031] Furthermore, the power supply module is controlled to stop outputting electrical energy to the shaft servo motor brake via the brake holding control circuit, specifically including:

[0032] When the mode selection switch Q130 is closed, the seventh relay K71 is energized. At this time, the first normally closed contact (11-12) and the second normally closed contact (21-22) corresponding to the seventh relay K71 are opened, thereby interrupting the power supply path from the power module to the shaft servo motor brake. At this time, the shaft servo motor brake is controlled by the output of the first BD port and the second BD port of the shaft servo motor driver. The shaft servo motor driver starts working when the mode selection switch Q130 is closed.

[0033] Furthermore, the turntable shaft signal switching circuit controls the shaft servo motor driver to be in the output state, specifically including:

[0034] The closing mode selection switch Q130 energizes the second fourth relay K24, the second fifth relay K25, and the third zero relay K30. At this time, the first normally open contact (13-14) and the second normally open contact (23-24) corresponding to the third zero relay K30 are closed, and the first normally closed contact (11-12) and the second normally closed contact (21-22) are opened. This switches the signal source for the reverse positioning and reverse positioning to the shaft servo motor driver. The shaft servo motor driver outputs the reverse positioning signal and the forward positioning signal to the reverse positioning input channel IN1 and the forward positioning input channel IN2, respectively.

[0035] Furthermore, when the mode selection switch Q130 is in the open state, the seventh zero relay K70 is de-energized, and the first normally closed contact (11-12) corresponding to the seventh zero relay K70 is in the closed state. At this time, an electrical signal is sent to the PLC through the rotary mode input channel IN6 so that the PLC can identify the current working mode.

[0036] When the mode selection switch Q130 is closed, the seventh zero relay K70 is energized, and the first normally open contact (13-14) corresponding to the seventh zero relay K70 is closed. At this time, an electrical signal is sent to the PLC through the shaft mode input channel IN5 so that the PLC can identify the current working mode.

[0037] Compared with the prior art, the present invention has at least the following beneficial effects:

[0038] (1) The present invention controls the brake control circuit and the turntable shaft signal switching circuit through the linkage of the mode selection switch. The brake control circuit is used to control the energized state of the first relay module through the open and closed state of the mode selection switch, and then control the open and closed state of the contact module. Based on the open and closed state of the contact module, the power supply module controls the on and off state of the output to the turntable servo motor brake. In the turntable shaft signal switching circuit, the second relay module controls the on and off state of the corresponding relay contact unit based on the open and closed state of the mode selection switch, thereby controlling the output state of the 0-degree detection photoelectric sensor and the 180-degree detection photoelectric sensor of the turntable. The third relay module controls the on / off state of the corresponding relay contact unit based on the on / off state of the mode selection switch. At the same time, it controls the output state of the shaft servo motor driver in combination with the on / off state of the corresponding relay contact unit of the second relay module. That is, the present invention controls the state of the shaft servo motor brake through the brake control circuit, and controls the switching of the corresponding signal sources of the turntable reverse position signal and the turntable forward position signal through the turntable shaft signal switching circuit (i.e., the switching between the turntable 0-degree detection photoelectric sensor, the turntable 180-degree detection photoelectric sensor and the shaft servo motor driver), which takes into account the injection molding working modes with two different application requirements of turntable and shaft.

[0039] (2) After controlling the turntable and shaft to the mechanical zero-degree position, this invention uses the brake control circuit and the turntable / shaft signal switching circuit to enable the multi-component injection molding machine to enter either the turntable working mode or the shaft working mode based on the open / closed state of the mode selection switch. When the mode selection switch is in the open state, i.e., in the turntable working mode, the brake control circuit controls the shaft servo motor brake to be energized, and the turntable / shaft signal switching circuit controls the 0-degree and 180-degree detection photoelectric sensors in the signal switching module to be in the output state, i.e., the 0-degree and 180-degree detection photoelectric sensors are used to input the reverse and forward rotation positions via the reverse input channel IN1 and the forward input channel IN1. The IN2 input channel outputs the corresponding signal. When the mode selection switch is closed, i.e., in the rotating shaft working mode, the brake control circuit controls the power module to stop outputting power to the rotating shaft servo motor brake, and controls the rotating shaft servo motor driver to be in the output state through the turntable rotating shaft signal switching circuit. That is, the signal source that sends the turntable reverse positioning signal and the turntable forward positioning signal is switched to the rotating shaft servo motor driver. The rotating shaft servo motor driver outputs the reverse positioning signal and the forward positioning signal to the reverse positioning input channel IN1 and the forward positioning input channel IN2 respectively, which realizes the smooth switching between the two different working modes of the turntable and the rotating shaft. Attached Figure Description

[0040] Figure 1 This is a circuit diagram for the brake holding control circuit;

[0041] Figure 2 This is a circuit diagram for switching signals on the turntable shaft.

[0042] Figure 3 This is a schematic diagram of the moving and stationary mold structures for a multi-component injection molding process.

[0043] Figure 4 This is a cross-sectional view of the overall structure of a multi-component injection molding machine;

[0044] Figure 5 This is a control diagram for the hydraulic motor oil circuit of the turntable.

[0045] Figure 6 This is a control circuit diagram for a proportional valve and a side positioning pin.

[0046] Figure 7 This is a diagram showing the signal interaction between the PLC and the shaft servo motor driver.

[0047] Figure 8 This is a circuit diagram for a safety gate control system.

[0048] In the picture:

[0049] 1. Moving mold;

[0050] 2. Mold setting;

[0051] 3. Turntable mechanism; 31. Turntable assembly; 311. Turntable; 32. First drive assembly;

[0052] 4. Rotating shaft mechanism; 41. Rotating shaft assembly; 411. Rotating shaft;

[0053] 5. Water distribution mechanism; 52. Water distribution block. Detailed Implementation

[0054] The following are specific embodiments of the present invention, which are described in conjunction with the accompanying drawings to further illustrate the technical solutions of the present invention. However, the present invention is not limited to these embodiments.

[0055] Example 1

[0056] To achieve switching between two injection molding modes—rotary and spindle—for different application requirements in a multi-component injection molding machine, this invention proposes a rotary and spindle working mode switching control circuit, applicable to multi-component injection molding machines that share both rotary and spindle modes. The switching control circuit includes:

[0057] Mode selection switch;

[0058] Power module;

[0059] Shaft servo motor driver;

[0060] A brake control circuit includes: a first relay module connected to a mode selection switch and its corresponding contact module; a shaft servo motor brake connected to a power supply module via the contact module; the shaft servo motor brake is also connected to a shaft servo motor driver; the brake control circuit controls the energization state of the first relay module by the open / closed state of the mode selection switch, thereby controlling the open / closed state of the contact module, and controls the on / off state of the power supply module output to the shaft servo motor brake based on the open / closed state of the contact module, so as to realize the braking control of the shaft servo motor brake;

[0061] like Figure 1 As shown, in the brake control circuit:

[0062] The first relay module includes a seventh zero relay K70 and a seventh one relay K71;

[0063] The contact module includes a first normally closed contact (11-12) and a second normally closed contact (21-22) corresponding to the seventh relay K71; wherein:

[0064] One end of the seventh relay K71 is connected to one end of the seventh zero relay K70 and then connected to one end of the mode selection switch Q130; the other end of the seventh zero relay K70 is connected to the other end of the seventh relay K71 and simultaneously connected to one end of the first normally closed contact (11-12) and the first normally open contact (13-14) of the seventh zero relay K70, one end of the second normally closed contact (21-22) of the seventh relay K71, and the negative terminal of the power module; one end of the first normally closed contact (11-12) of the seventh relay K71 is connected to the positive terminal of the power module and simultaneously connected to the other end of the mode selection switch Q130; the positive terminal of the shaft servo motor brake is connected to the other end of the first normally closed contact (11-12) of the seventh relay K71 and then connected to the first BD port of the shaft servo motor driver; the negative terminal of the shaft servo motor brake is connected to the other end of the second normally closed contact (21-22) of the seventh relay K71 and then connected to the second BD port of the shaft servo motor driver.

[0065] The other end of the seventh zero relay K70 corresponding to the first normally closed contact (11-12) is connected to the rotary mode input channel IN6 in the PLC;

[0066] The other end of the seventh zero relay K70 corresponding to the first normally open contact (13-14) is connected to the shaft mode input channel IN5 in the PLC.

[0067] The brake control circuit also includes:

[0068] The first six relay KS16, the seventh zero six switch S706, and the first normally open contact (14-13) and the second normally open contact (24-23) corresponding to the first six relay KS16;

[0069] The first normally open contact (14-13) corresponding to the first sixth relay KS16 is connected in parallel with the first normally closed contact (11-12) corresponding to the seventh relay K71, and one of its parallel terminals is connected to one end of the seventh zero-six switch S706 between the positive terminal of the power module and the other end of the seventh zero-six switch S706. The second normally open contact (24-23) corresponding to the first sixth relay KS16 is connected in parallel with the second normally closed contact (21-22) corresponding to the seventh relay K71. The other end of the first sixth relay KS16 is connected to the negative terminal of the power module.

[0070] It should be explained that users sometimes need to adjust the position of the rotating shaft when the safety door is open. In this situation, the rotating shaft cannot rotate because the servo motor brake is engaged. Figure 1As shown, the S706 forced brake release button (this button is a self-resetting jog switch) needs to be pressed to energize KS16. The (13-14) and (23-24) contacts of KS16 close to supply power to the shaft servo motor brake, and the brake will open. After the position adjustment is completed, release the button, S706 resets, KS16 is de-energized, and the (13-14) and (23-24) contacts of KS16 return to the normally open state. The brake is de-energized again and engages. This can meet the needs of special installation and commissioning.

[0071] A turntable shaft signal switching circuit includes: a second relay module connected to a mode selection switch, a third relay module connected to a turntable servo motor driver, and a signal switching module. The signal switching module includes relay contact units corresponding to the second and third relay modules, and 0-degree and 180-degree turntable detection photoelectric sensors. The second relay module controls the on / off state of the corresponding relay contact unit based on the open / closed state of the mode selection switch, thereby controlling the output state of the 0-degree and 180-degree turntable detection photoelectric sensors. The output signals corresponding to the 0-degree and 180-degree turntable detection photoelectric sensors are respectively a turntable reverse rotation signal and a turntable forward rotation signal. The third relay module controls the on / off state of the corresponding relay contact unit based on the open / closed state of the mode selection switch, and simultaneously controls the output state of the turntable servo motor driver in conjunction with the on / off state of the corresponding relay contact unit of the second relay module. The output of the turntable servo motor driver includes a turntable reverse rotation signal and a turntable forward rotation signal.

[0072] like Figure 2 As shown, in the turntable shaft signal switching circuit:

[0073] The second relay module includes a third zero relay K30;

[0074] The third relay module includes a second fourth relay K24 and a second fifth relay K25;

[0075] The signal switching module includes the first normally open contact (13-14), the first normally closed contact (11-12), the second normally open contact (23-24), and the second normally closed contact (21-22) corresponding to the third zero relay K30; the normally open contact (13-14) corresponding to the second fourth relay K24; the normally open contact (23-24) corresponding to the second fifth relay K25; and a 0-degree detection photoelectric sensor and a 180-degree detection photoelectric sensor for the turntable; wherein:

[0076] One end of the third zero relay K30 is connected to one end of the mode selection switch Q130, and the other end is connected to the negative terminal of the power supply module; the other end of the mode selection switch Q130 is connected to the positive terminal of the power supply module; one end of the third zero relay K30 corresponding to the first normally open contact (13-14) is connected to one end of the third zero relay K30 corresponding to the first normally closed contact (11-12) and then connected to the reverse positioning input channel IN1 in the PLC, and the other end is connected to one end of the second fourth relay K24 corresponding to the normally open contact (13-14); the other end of the third zero relay K30 corresponding to the first normally closed contact (11-12) is connected to the second wiring point of the 0-degree detection photoelectric sensor of the turntable; the first wiring point of the 0-degree detection photoelectric sensor of the turntable is connected to the positive terminal of the power supply module, and the third wiring point is connected to the negative terminal of the power supply module; the other end of the second fourth relay K24 corresponding to the normally open contact (13-14) is connected to the negative terminal of the power supply module; the third zero relay K30 corresponding to the second normally open contact (23-24) One end of the relay is connected to one end of the second normally closed contact (21-22) and then connected to the forward rotation to position input channel IN2 in the PLC; the other end is connected to one end of the normally open contact (23-24) corresponding to the second fifth relay K25; the other end of the third zero relay K30 corresponding to the second normally closed contact (21-22) is connected to the second connection point of the 180-degree detection photoelectric sensor of the turntable; the first connection point of the 180-degree detection photoelectric sensor of the turntable is connected to the positive terminal of the power supply module, and the third connection point is connected to the negative terminal of the power supply module; the other end of the normally open contact (23-24) corresponding to the second fifth relay K25 is connected to the negative terminal of the power supply module; one end of the second fourth relay K24 is connected to one end of the second fifth relay K25, and its connection end is connected to the ground terminal in the shaft servo motor driver; the other end of the second fourth relay K24 is connected to the reverse rotation to position output port D01 in the shaft servo motor driver; the other end of the second fifth relay K25 is connected to the forward rotation to position output port D02 in the shaft servo motor driver;

[0077] The turntable shaft signal switching circuit further includes: a 0-degree shaft detection photoelectric sensor and a 180-degree shaft detection photoelectric sensor that are always in output state; the second connection point of the 0-degree shaft detection photoelectric sensor is connected to the 0-degree shaft detection signal input channel IN3 in the PLC, the first connection point is connected to the positive terminal of the power supply module, and the third connection point is connected to the negative terminal of the power supply module; the second connection point of the 180-degree shaft detection photoelectric sensor is connected to the 180-degree shaft detection signal input channel IN3 in the PLC, the first connection point is connected to the positive terminal of the power supply module, and the third connection point is connected to the negative terminal of the power supply module.

[0078] It should be noted that in both turntable and shaft working modes, the 0-degree and 180-degree shaft detection photocells are in active condition and are used to detect the zero-degree position of the machine.

[0079] This invention uses a mode selection switch to link and control the brake control circuit and the turntable shaft signal switching circuit. The brake control circuit controls the energization state of the first relay module by the open / closed state of the mode selection switch, thereby controlling the open / closed state of the contact module. Based on the open / closed state of the contact module, it controls the on / off state of the power supply module's output to the turntable servo motor brake. In the turntable shaft signal switching circuit, the second relay module controls the on / off state of the corresponding relay contact unit based on the open / closed state of the mode selection switch, thereby controlling the output state of the 0-degree and 180-degree turntable detection photoelectric sensors. The third relay module controls the on / off state of the corresponding relay contact unit based on the on / off state of the mode selection switch. At the same time, it controls the output state of the shaft servo motor driver in combination with the on / off state of the corresponding relay contact unit of the second relay module. That is, the present invention controls the state of the shaft servo motor brake through the brake holding control circuit, and controls the switching of the corresponding signal sources of the turntable reverse positioning signal and the turntable forward positioning signal through the turntable shaft signal switching circuit (i.e., the switching between the turntable 0-degree detection photoelectric sensor, the turntable 180-degree detection photoelectric sensor and the shaft servo motor driver), which takes into account the injection molding working modes with two different application requirements of turntable and shaft.

[0080] Example 2

[0081] The turntable and shaft working mode switching control circuit and method described in this invention are both applied to a multi-component injection molding machine that uses both a turntable and a shaft. Figure 3 and Figure 4 As shown, the injection molding machine includes a moving mold (1) and a fixed mold (2), with the moving mold (1) located on one side of the fixed mold (2); it also includes:

[0082] The turntable mechanism (3) includes a turntable assembly (31) and a first drive assembly (32). The turntable assembly (31) includes a turntable (311) rotatably disposed on the side of the moving mold (1) near the fixed mold (2). The turntable (311) is provided with a first water channel. The first drive assembly (32) is connected to the turntable (311) and is used to drive the turntable (311) to rotate.

[0083] The rotating shaft mechanism (4) includes a rotating shaft assembly (41), a second drive assembly, and a center support assembly. The rotating shaft assembly (41) includes a rotating shaft (411) that is movably inserted through the middle of the moving mold (1). The rotating shaft (411) is provided with a second water channel that can communicate with the first water channel. The second drive assembly is connected to the rotating shaft (411) and is used to drive the rotating shaft (411) to rotate. The center support assembly is used to drive the rotating shaft (411) to move in the axial direction.

[0084] The water distribution mechanism (5) includes a water distribution sleeve assembly and a locking assembly. The water distribution sleeve assembly is fixed on the outer side of the rotating shaft (411) away from the fixed mold (2). The water distribution sleeve assembly is provided with a third water channel communicating with the second water channel. The locking assembly includes a water distribution block (52) for connecting the rotating shaft (411) and the turntable (311). The water distribution block (52) is detachably inserted into the end of the rotating shaft (411) near the turntable (311) and connected to the turntable (311) so that the first water channel communicates with the second water channel.

[0085] When using the turntable, the water divider block can be inserted into the rotating shaft to fix the turntable and the rotating shaft together. At this time, the first water channel on the turntable can be connected with the second water channel on the rotating shaft, thus ensuring the normal water supply of the turntable. Specifically, when using the turntable 311, the water divider block is inserted between the turntable 311 and the rotating shaft 411, fixing the turntable 311 and the rotating shaft 411 together. When the first drive assembly 32 drives the turntable 311 to rotate, the turntable 311 drives the rotating shaft 411 to rotate together, thus ensuring the connection between the first water channel and the second water channel. Of course, when using the rotating shaft 411, since the water in the rotating shaft 411 does not need to pass through the turntable 311, the turntable 311 does not need to move. Therefore, when using the rotating shaft 411, the water divider block can be removed, and the second drive assembly only needs to drive the rotating shaft 411 to rotate. Through the independent drive of the turntable 311 and the rotating shaft 411, energy can be saved and the operating cost reduced during the use of the rotating shaft 411.

[0086] In this embodiment, in order to achieve a fixed connection between the turntable 311 and the rotating shaft 411, a first positioning hole is provided on the turntable 311, and a positioning groove communicating with the first positioning hole is provided on one end of the rotating shaft 411 near the turntable 311. The water distribution block can be movably inserted into the positioning groove through the first positioning hole. When the turntable 311 rotates, the rotation drives the water distribution block to rotate together, and the water distribution block drives the rotating shaft 411 to rotate together, so as to achieve synchronous rotation of the rotating shaft 411 and the turntable 311.

[0087] Example 3

[0088] To achieve smooth switching between two different operating modes—rotary head and rotary shaft—this invention proposes a control method for switching operating modes of a rotary head and rotary shaft, applicable to multi-component injection molding machines that include a control circuit for switching operating modes of a rotary head and rotary shaft; the control method includes:

[0089] The control turntable and the rotating shaft are at the mechanical zero-degree position; the mechanical zero-degree position is the position of the turntable and the rotating shaft when the 0-degree detection photoelectric sensor of the turntable and the 0-degree detection photoelectric sensor of the rotating shaft are triggered simultaneously.

[0090] Based on the open / closed state of the mode selection switch, the brake control circuit and the turntable shaft signal switching circuit enable the multi-component injection molding machine to enter either the turntable working mode or the shaft working mode. The open / closed state includes an open state corresponding to the turntable working mode and a closed state corresponding to the shaft working mode. When the mode selection switch is in the open state, the brake control circuit controls the shaft servo motor brake to be energized, and the turntable shaft signal switching circuit controls the 0-degree and 180-degree detection photoelectric sensors in the signal switching module to be in the output state. When the mode selection switch is in the closed state, the brake control circuit controls the power module to stop outputting power to the shaft servo motor brake, and the turntable shaft signal switching circuit controls the shaft servo motor driver to be in the output state.

[0091] It should be noted that before using the turntable working mode, the water distribution block must be inserted between the turntable 311 and the rotating shaft 411 in advance to fix the turntable 311 and the rotating shaft 411 together. When the first drive component 32 drives the turntable 311 to rotate, the turntable 311 drives the rotating shaft 411 to rotate together, so as to ensure that the first water channel and the second water channel are connected.

[0092] The control principle in turntable operation mode is as follows:

[0093] Through such Figure 1 The brake control circuit shown controls the servo motor brake of the rotating shaft to be energized, specifically including:

[0094] Disconnect the mode selection switch to de-energize the seventh relay K71. At this time, the first normally closed contact (11-12) and the second normally closed contact (21-22) of the seventh relay K71 remain closed, thereby connecting the power supply path between the power module and the shaft servo motor brake, and energizing the shaft servo motor brake.

[0095] Through such Figure 2 The turntable shaft signal switching circuit control signal switching module shown in the diagram has the turntable 0-degree detection photoelectric sensor and the turntable 180-degree detection photoelectric sensor in output state, specifically including:

[0096] When the mode selection switch is off, the third zero relay K30 is de-energized. At this time, the first normally open contact (13-14) and the second normally open contact (23-24) of the third zero relay K30 remain open, and the first normally closed contact (11-12) and the second normally closed contact (21-22) remain closed. This puts the signal sources for the reverse rotation and the reverse rotation to the correct position, namely the 0-degree and 180-degree turntable detection photoelectric sensors, into the output state (at this time, the two signal paths K24 and K25 are in the open circuit state). The 0-degree and 180-degree turntable detection photoelectric sensors output the corresponding signals to the reverse rotation input channel IN1 and the forward rotation input channel IN2, respectively.

[0097] When the mode selection switch is in the off state, the seventh zero relay K70 is de-energized, and the first normally closed contact (11-12) corresponding to the seventh zero relay K70 is in the closed state. At this time, an electrical signal is sent to the PLC through the rotary mode input channel IN6 so that the PLC can identify the current working mode.

[0098] It should be noted that since the water in the rotating shaft 411 does not need to pass through the turntable 311, the turntable 311 does not need to move. Therefore, before using the rotating shaft working mode, the water distribution block needs to be removed in advance. The second drive component only needs to drive the rotating shaft 411 to rotate. Through the independent drive of the turntable 311 and the rotating shaft 411, energy can be saved and the operating cost can be reduced during the use of the rotating shaft 411.

[0099] It is particularly important to note that the rotary table working mode will only be officially enabled when the rotary table working mode is enabled on the PLC and there is a signal on the rotary table mode input channel IN6; otherwise, an alarm will sound to prevent control risks caused by operational errors.

[0100] The control principle in the rotating shaft working mode is as follows:

[0101] Through such Figure 1 The brake control circuit shown controls the power supply module to stop outputting electrical energy to the shaft servo motor brake, specifically including:

[0102] When the mode selection switch is closed, the seventh relay K71 is energized. At this time, the first normally closed contact (11-12) and the second normally closed contact (21-22) of the seventh relay K71 are disconnected, thereby interrupting the power supply path from the power module to the shaft servo motor brake. At this time, the shaft servo motor brake is controlled by the output of the first BD port and the second BD port of the shaft servo motor driver. The shaft servo motor driver starts working when the mode selection switch is closed.

[0103] Through such Figure 2 The turntable axis signal switching circuit shown controls the axis servo motor driver to be in output mode, specifically including:

[0104] When the mode selection switch is closed, the second fourth relay K24, the second fifth relay K25, and the third zero relay K30 are energized. At this time, the first normally open contact (13-14) and the second normally open contact (23-24) of the third zero relay K30 are closed, and the first normally closed contact (11-12) and the second normally closed contact (21-22) are open. This switches the signal source for the reverse positioning and the reverse positioning signal to the shaft servo motor driver. The shaft servo motor driver outputs the reverse positioning signal and the forward positioning signal to the reverse positioning input channel IN1 and the forward positioning input channel IN2, respectively.

[0105] When the mode selection switch is closed, the seventh zero relay K70 is energized, and the first normally open contact (13-14) corresponding to the seventh zero relay K70 is closed. At this time, an electrical signal is sent to the PLC through the shaft mode input channel IN5 so that the PLC can identify the current working mode.

[0106] It is particularly important to note that the rotary axis working mode will only be officially enabled when the rotary axis working mode is enabled on the PLC and there is a signal in the rotary axis mode input channel IN5; otherwise, an alarm will be triggered to prevent control risks caused by operational errors.

[0107] Example 4

[0108] This embodiment describes the safety gate control logic of a multi-component injection molding machine in the rotating shaft working mode:

[0109] like Figure 8 As shown:

[0110] When the safety door is closed and the emergency stop signal is not triggered, the contact corresponding to the safety signal closes.

[0111] When the safety door is open but the emergency stop signal is not triggered, the contact corresponding to the safety signal is disconnected;

[0112] When the safety door is closed but the emergency stop signal is triggered, the contact corresponding to the safety signal is disconnected;

[0113] When the safety door is closed and the emergency stop signal is not triggered, the STO safety control module of the driver is energized, which in turn energizes K0. K0 contacts (13-14) and (23-24) close to a normally closed state, causing the BD1 and BD2 channels of the shaft servo motor driver to output 24V DC power to control the shaft servo motor brake to open. When either the safety door is opened or the emergency stop signal is triggered, the STO safety control module of the driver is de-energized, causing K0 to de-energize. K0 contacts (13-14) and (23-24) are in a normally open state, controlling BD1 and BD2 to de-energize the shaft servo motor brake, thus engaging the brake. When K0 is de-energized, its contact (33-34) becomes normally open, simultaneously causing K00 to de-energize. The shaft servo motor driver stops supplying three-phase power to the shaft servo motor, leaving the motor in a free state without control. The purpose of the safety door control circuit in this embodiment is to prevent the mold core on the shaft from continuing to rotate and causing personal injury when the safety door is open or in an emergency stop situation.

[0114] Example 5

[0115] This embodiment uses the example of clockwise rotation of the turntable after a successful turntable mode switch as an example for detailed explanation:

[0116] Figure 5 In the diagram, the turntable hydraulic motor, HM3, is controlled by DF16. Figure 6 The PLC controls the switching of the inlet and outlet oil channels of the DF16 proportional valve to the turntable hydraulic motor by providing corresponding 0 to ±10V voltage through the analog input channels AO1+ and GND according to the rotation direction requirements. 0 to -10V represents the opening of the reverse oil circuit of the proportional valve DF16 from 0 to 100%, and 0 to 10V represents the opening of the forward oil circuit of the proportional valve DF16 from 0 to 100%. The opening of the reverse oil circuit controls the turntable hydraulic motor to rotate in reverse, and the opening of the forward oil circuit controls the turntable hydraulic motor to rotate in the forward direction, thereby realizing the turntable hydraulic motor controlling the turntable to rotate in both directions.

[0117] Assuming the safety gate is closed and the emergency stop signal is not triggered, and the turntable's operating mode is successfully switched, taking clockwise rotation of the turntable as an example, before performing the turntable action, Figure 6 The PLC controls the side positioning pin retraction via D07. When both side positioning pin retraction detection photocells S603-1 and S603-2 are triggered, it indicates that the side positioning pin retraction has reached its position. Then, the PLC outputs a 0-10V analog signal to the proportional valve DF16 via the AO1+ and GND analog output channels, initiating a clockwise rotation from 0° to 180°. During this process, the turntable encoder sends the monitored turntable motion data to the PLC in real time. At the 180° position, the 0-10V analog signal controlling the turntable motion stops outputting. At this point, the 180° turntable detection photocell is activated. Figure 2When the S601 photoelectric sensor is triggered, the PLC compares the signal from the rotary encoder with the detection signal from the 180° photoelectric sensor. If the signals are correct, the PLC proceeds. Figure 6 DO6 in the middle performs the side positioning pin advance action. When both side positioning pin advance detection photoelectric sensors S602-1 and S602-2 are triggered, it indicates that the side positioning pin advance action has been completed, the turntable has been fixed, and the mold closing action begins. The turntable reverse action is performed in the same way.

[0118] Example 6

[0119] This embodiment uses the example of clockwise rotation of the shaft after successful switching to the shaft's operating mode as a detailed explanation:

[0120] Assuming the safety gate is closed and the emergency stop signal is not triggered, and the shaft's operating mode switch is successful, taking clockwise rotation of the shaft as an example. Figure 7 The PLC outputs a 0-10V analog signal to control the speed and a DO2 signal to enable the shaft's clockwise rotation via the analog AO+ and GND channels. Upon receiving the speed and direction signals, the shaft servo motor driver controls the shaft servo motor to rotate clockwise from 0° to 180° according to its built-in motion control curve. Once the shaft reaches the 180° position... Figure 2 The DO2 output of the central axis servo motor driver sends a forward rotation signal to energize relay K25. The (23-24) contacts of K25 close, sending a signal to the forward rotation input channel IN2 of the computer PLC (in the axis operating mode, contacts 23-24 of K30 are closed). Simultaneously, at the 180° position of the axis, the S601.1 photoelectric sensor triggers, sending a signal to the 180° axis photoelectric sensor input channel IN4 of the computer PLC. The computer PLC determines that the forward rotation action is complete when both signals are satisfied and begins the center-mounted retraction action. The final retraction detection photoelectric sensor triggers, indicating that the center-mounted retraction is complete, and the mold closing action begins. The reverse rotation action is similar.

[0121] Additionally, it should be noted that, as Figure 7 As shown, before the computer PLC controls the shaft to move, it needs to output the DO3 shaft enable signal to the shaft servo motor driver. Before the first shaft movement, a zeroing action needs to be performed. The zeroing signal is sent by the computer PLC to the shaft servo motor driver through the DO4 channel. When the shaft servo motor driver has an alarm fault, it will send an alarm signal to the IN7 input channel of the computer PLC. After the fault is cleared, the computer PLC can clear the alarm at the driver end by resetting the DO5 servo.

[0122] It should be noted that all directional indications (such as up, down, left, right, front, back, etc.) in the embodiments of the present invention are only used to explain the relative positional relationship and movement of each component in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indication will also change accordingly.

[0123] Furthermore, in this invention, descriptions involving terms such as "first," "second," and "a" are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this invention, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0124] In this invention, unless otherwise explicitly specified and limited, the terms "connection," "fixed," etc., should be interpreted broadly. For example, "fixed" can mean a fixed connection, a detachable connection, or an integral part; it can mean a mechanical connection or an electrical connection; it can mean a direct connection or an indirect connection through an intermediate medium; it can mean the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0125] Furthermore, the technical solutions of the various embodiments of the present invention can be combined with each other, but only if they are feasible for those skilled in the art. If the combination of technical solutions is contradictory or cannot be implemented, it should be considered that such combination of technical solutions does not exist and is not within the scope of protection claimed by the present invention.

Claims

1. A control circuit for switching working modes of a turntable and a rotating shaft, characterized in that, The switching control circuit, applicable to multi-component injection molding machines that share a turntable and a rotating shaft, includes: Mode selection switch; Power module; Shaft servo motor driver; A brake control circuit includes: a first relay module connected to a mode selection switch and its corresponding contact module; a shaft servo motor brake connected to a power supply module via the contact module; the shaft servo motor brake is also connected to a shaft servo motor driver; the brake control circuit controls the energization state of the first relay module by the open / closed state of the mode selection switch, thereby controlling the open / closed state of the contact module, and controls the on / off state of the power supply module output to the shaft servo motor brake based on the open / closed state of the contact module, so as to realize the braking control of the shaft servo motor brake; A turntable shaft signal switching circuit includes: a second relay module connected to a mode selection switch, a third relay module connected to a turntable servo motor driver, and a signal switching module. The signal switching module includes relay contact units corresponding to the second and third relay modules, and 0-degree and 180-degree turntable detection photoelectric sensors. The second relay module controls the on / off state of the corresponding relay contact unit based on the open / closed state of the mode selection switch, thereby controlling the output state of the 0-degree and 180-degree turntable detection photoelectric sensors. The output signals corresponding to the 0-degree and 180-degree turntable detection photoelectric sensors are respectively a turntable reverse rotation signal and a turntable forward rotation signal. The third relay module controls the on / off state of the corresponding relay contact unit based on the open / closed state of the mode selection switch, and simultaneously controls the output state of the turntable servo motor driver in conjunction with the on / off state of the corresponding relay contact unit of the second relay module. The output of the turntable servo motor driver includes a turntable reverse rotation signal and a turntable forward rotation signal.

2. The turntable and shaft working mode switching control circuit according to claim 1, characterized in that, In the brake control circuit: The first relay module includes a seventh zero relay K70 and a seventh one relay K71; The contact module includes a first normally closed contact and a second normally closed contact corresponding to the 71st relay K71; wherein: One end of the 71st relay K71 is connected to one end of the 70th relay K70, and then connected to one end of the mode selection switch Q130; the other end of the 70th relay K70 is connected to the other end of the 71st relay K71, and simultaneously connected to one end of the first normally closed contact and the first normally open contact corresponding to the 70th relay K70, one end of the second normally closed contact corresponding to the 71st relay K71, and the negative terminal of the power module; one end of the first normally closed contact corresponding to the 71st relay K71 is connected to the positive terminal of the power module and simultaneously connected to the other end of the mode selection switch Q130; the positive terminal of the shaft servo motor brake is connected to the other end of the first normally closed contact corresponding to the 71st relay K71 and then connected to the first BD port of the shaft servo motor driver; the negative terminal of the shaft servo motor brake is connected to the other end of the second normally closed contact corresponding to the 71st relay K71 and then connected to the second BD port of the shaft servo motor driver. The other end of the seventh zero relay K70 corresponding to the first normally closed contact is connected to the rotary mode input channel IN6 in the PLC. The other end of the seventh zero relay K70 corresponding to the first normally open contact is connected to the shaft mode input channel IN5 in the PLC.

3. The turntable and shaft working mode switching control circuit according to claim 2, characterized in that, The brake control circuit also includes: The first six relay KS16, the seventh zero six switch S706, and the first normally open contact and the second normally open contact corresponding to the first six relay KS16; The first normally open contact corresponding to the first sixth relay KS16 is connected in parallel with the first normally closed contact corresponding to the seventh eleventh relay K71, and one of its parallel terminals is connected to one end of the seventh zero-six switch S706 between the positive terminal of the power module and the other end of the seventh zero-six switch S706. The second normally open contact corresponding to the first sixth relay KS16 is connected in parallel with the second normally closed contact corresponding to the seventh eleventh relay K71. The other end of the first sixth relay KS16 is connected to the negative terminal of the power module.

4. The turntable and shaft working mode switching control circuit according to claim 3, characterized in that, In the turntable shaft signal switching circuit: The second relay module includes a third zero relay K30; The third relay module includes a second fourth relay K24 and a second fifth relay K25; The signal switching module includes the first normally open contact, the first normally closed contact, the second normally open contact, and the second normally closed contact corresponding to the third zero relay K30; the normally open contact corresponding to the second fourth relay K24; the normally open contact corresponding to the second fifth relay K25; and the 0-degree detection photoelectric sensor and the 180-degree detection photoelectric sensor for the turntable; wherein: One end of the third zero relay K30 is connected to one end of the mode selection switch Q130, and the other end is connected to the negative terminal of the power module; the other end of the mode selection switch Q130 is connected to the positive terminal of the power module; one end of the third zero relay K30 corresponding to the first normally open contact is connected to the first normally closed contact of the third zero relay K30 and then connected to the reverse positioning input channel IN1 in the PLC, and the other end is connected to one end of the normally open contact of the second fourth relay K24; the other end of the third zero relay K30 corresponding to the first normally closed contact is connected to the second wiring point of the turntable 0-degree detection photoelectric sensor; the first wiring point of the turntable 0-degree detection photoelectric sensor is connected to the positive terminal of the power module, and the third wiring point is connected to the negative terminal of the power module; the other end of the second fourth relay K24 corresponding to the normally open contact is connected to the negative terminal of the power module; one end of the third zero relay K30 corresponding to the second normally open contact is connected to the second normally closed contact of the second normally closed contact of the fourth fourth relay K24 and then connected to the second normally closed contact of the fourth fourth relay K24. One end of the closed contact is connected to the forward rotation to position input channel IN2 in the PLC, and the other end is connected to one end of the normally open contact corresponding to the second fifth relay K25; the other end of the third zero relay K30 corresponding to the second normally closed contact is connected to the second connection point of the 180-degree turntable detection photoelectric sensor; the first connection point of the 180-degree turntable detection photoelectric sensor is connected to the positive terminal of the power supply module, and the third connection point is connected to the negative terminal of the power supply module; the other end of the normally open contact corresponding to the second fifth relay K25 is connected to the negative terminal of the power supply module; one end of the second fourth relay K24 is connected to one end of the second fifth relay K25, and its connection end is connected to the ground terminal in the shaft servo motor driver; the other end of the second fourth relay K24 is connected to the reverse rotation to position output port D01 in the shaft servo motor driver; the other end of the second fifth relay K25 is connected to the forward rotation to position output port D02 in the shaft servo motor driver; The turntable shaft signal switching circuit further includes: a 0-degree shaft detection photoelectric sensor and a 180-degree shaft detection photoelectric sensor that are always in output state; the second connection point of the 0-degree shaft detection photoelectric sensor is connected to the 0-degree shaft detection signal input channel IN3 in the PLC, the first connection point is connected to the positive terminal of the power supply module, and the third connection point is connected to the negative terminal of the power supply module; the second connection point of the 180-degree shaft detection photoelectric sensor is connected to the 180-degree shaft detection signal input channel IN3 in the PLC, the first connection point is connected to the positive terminal of the power supply module, and the third connection point is connected to the negative terminal of the power supply module.

5. A method for switching working modes of a turntable and a rotating shaft, characterized in that, A control method applicable to multi-component injection molding machines that include a control circuit for switching operating modes of a turntable and a shaft; the control method includes: The control turntable and the rotating shaft are at the mechanical zero-degree position; the mechanical zero-degree position is the position of the turntable and the rotating shaft when the 0-degree detection photoelectric sensor of the turntable and the 0-degree detection photoelectric sensor of the rotating shaft are triggered simultaneously. Based on the open / closed state of the mode selection switch, the brake control circuit and the turntable shaft signal switching circuit enable the multi-component injection molding machine to enter either the turntable working mode or the shaft working mode. The open / closed state includes an open state corresponding to the turntable working mode and a closed state corresponding to the shaft working mode. When the mode selection switch is in the open state, the brake control circuit controls the shaft servo motor brake to be energized, and the turntable shaft signal switching circuit controls the 0-degree and 180-degree detection photoelectric sensors in the signal switching module to be in the output state. When the mode selection switch is in the closed state, the brake control circuit controls the power module to stop outputting power to the shaft servo motor brake, and the turntable shaft signal switching circuit controls the shaft servo motor driver to be in the output state.

6. The method for switching working modes of a turntable and a rotating shaft according to claim 5, characterized in that, The brake servo motor brake is energized by the brake holding brake control circuit, specifically including: Disconnect the mode selection switch to de-energize the seventh relay K71. At this time, the first normally closed contact and the second normally closed contact of the seventh relay K71 remain closed, thereby connecting the power supply path between the power module and the shaft servo motor brake, and energizing the shaft servo motor brake.

7. The method for switching working modes of a turntable and a rotating shaft according to claim 5, characterized in that, The turntable shaft signal switching circuit controls the turntable 0-degree detection photoelectric sensor and the turntable 180-degree detection photoelectric sensor in the signal switching module to be in output state, specifically including: Disconnect the mode selection switch to de-energize the third zero relay K30. At this time, the first normally open contact and the second normally open contact of the third zero relay K30 remain open, and the first normally closed contact and the second normally closed contact remain closed. This puts the signal sources for the reverse positioning and the reverse positioning, namely the 0-degree detection photoelectric sensor and the 180-degree detection photoelectric sensor of the turntable, into the output state. The 0-degree detection photoelectric sensor and the 180-degree detection photoelectric sensor of the turntable output the corresponding signals to the reverse positioning input channel IN1 and the forward positioning input channel IN2, respectively.

8. The method for switching working modes of a turntable and a rotating shaft according to claim 6, characterized in that, The brake holding control circuit controls the power module to stop outputting electrical energy to the shaft servo motor brake, specifically including: When the mode selection switch is closed, the seventh relay K71 is energized. At this time, the first normally closed contact and the second normally closed contact corresponding to the seventh relay K71 are disconnected, thereby interrupting the power supply path from the power module to the shaft servo motor brake. At this time, the shaft servo motor brake is controlled by the output of the first BD port and the second BD port of the shaft servo motor driver. The shaft servo motor driver starts working when the mode selection switch is closed.

9. The method for switching working modes of a turntable and a rotating shaft according to claim 7, characterized in that, The rotary axis servo motor driver is controlled to be in output state by the rotary axis signal switching circuit, specifically including: The closing mode selection switch energizes the second fourth relay K24, the second fifth relay K25, and the third zero relay K30. At this time, the first normally open contact and the second normally open contact of the third zero relay K30 are closed, and the first normally closed contact and the second normally closed contact are open. This switches the signal source for the reverse positioning and reverse positioning to the shaft servo motor driver. The shaft servo motor driver outputs the reverse positioning signal and the forward positioning signal to the reverse positioning input channel IN1 and the forward positioning input channel IN2, respectively.

10. The method for switching working modes of a turntable and a rotating shaft according to claim 9, characterized in that, When the mode selection switch is in the off state, the seventh zero relay K70 is de-energized, and the first normally closed contact corresponding to the seventh zero relay K70 is in the closed state. At this time, an electrical signal is sent to the PLC through the rotary mode input channel IN6 so that the PLC can identify the current working mode. When the mode selection switch is closed, the seventh zero relay K70 is energized, and the first normally open contact corresponding to the seventh zero relay K70 is closed. At this time, an electrical signal is sent to the PLC through the shaft mode input channel IN5 so that the PLC can identify the current working mode.

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